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glib/gio/gunixmounts.c
Philip Withnall 672a33002e
gunixmounts: Squash a static analyser false positive 
scan-build thinks that there can be a `NULL` pointer dereference of
`error` here because it doesn’t understand that the function return
value and `GError` are related: when a valid return value is returned,
the error is `NULL` and vice-versa.

Try and make that clearer to the static analyser by checking whether the
error is `NULL`, rather than the return value.

Signed-off-by: Philip Withnall <pwithnall@gnome.org>

Helps: #1767
2024-04-25 23:57:46 +01:00

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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/* GIO - GLib Input, Output and Streaming Library
*
* Copyright (C) 2006-2007 Red Hat, Inc.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
*
* Author: Alexander Larsson <alexl@redhat.com>
*/
/* Prologue {{{1 */
#include "config.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#ifndef HAVE_SYSCTLBYNAME
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#endif
#ifdef HAVE_POLL
#include <poll.h>
#endif
#include <stdio.h>
#include <unistd.h>
#include <sys/time.h>
#include <errno.h>
#include <string.h>
#include <signal.h>
#include <gstdio.h>
#include <dirent.h>
#if defined(__ANDROID__) && (__ANDROID_API__ < 26)
#include <mntent.h>
/* the shared object of recent bionic libc's have hasmntopt symbol, but
some a possible common build environment for android, termux ends
up with insufficient __ANDROID_API__ value for building.
*/
extern char* hasmntopt(const struct mntent* mnt, const char* opt);
#endif
#if HAVE_SYS_STATFS_H
#include <sys/statfs.h>
#endif
#if HAVE_SYS_STATVFS_H
#include <sys/statvfs.h>
#endif
#if HAVE_SYS_VFS_H
#include <sys/vfs.h>
#elif HAVE_SYS_MOUNT_H
#if HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#include <sys/mount.h>
#endif
#ifndef O_BINARY
#define O_BINARY 0
#endif
#include "gunixmounts.h"
#include "gfile.h"
#include "gfilemonitor.h"
#include "glibintl.h"
#include "glocalfile.h"
#include "gthemedicon.h"
#include "gcontextspecificgroup.h"
#ifdef HAVE_MNTENT_H
static const char *_resolve_dev_root (void);
#endif
/**
* GUnixMountType:
* @G_UNIX_MOUNT_TYPE_UNKNOWN: Unknown UNIX mount type.
* @G_UNIX_MOUNT_TYPE_FLOPPY: Floppy disk UNIX mount type.
* @G_UNIX_MOUNT_TYPE_CDROM: CDROM UNIX mount type.
* @G_UNIX_MOUNT_TYPE_NFS: Network File System (NFS) UNIX mount type.
* @G_UNIX_MOUNT_TYPE_ZIP: ZIP UNIX mount type.
* @G_UNIX_MOUNT_TYPE_JAZ: JAZZ UNIX mount type.
* @G_UNIX_MOUNT_TYPE_MEMSTICK: Memory Stick UNIX mount type.
* @G_UNIX_MOUNT_TYPE_CF: Compact Flash UNIX mount type.
* @G_UNIX_MOUNT_TYPE_SM: Smart Media UNIX mount type.
* @G_UNIX_MOUNT_TYPE_SDMMC: SD/MMC UNIX mount type.
* @G_UNIX_MOUNT_TYPE_IPOD: iPod UNIX mount type.
* @G_UNIX_MOUNT_TYPE_CAMERA: Digital camera UNIX mount type.
* @G_UNIX_MOUNT_TYPE_HD: Hard drive UNIX mount type.
*
* Types of UNIX mounts.
**/
typedef enum {
G_UNIX_MOUNT_TYPE_UNKNOWN,
G_UNIX_MOUNT_TYPE_FLOPPY,
G_UNIX_MOUNT_TYPE_CDROM,
G_UNIX_MOUNT_TYPE_NFS,
G_UNIX_MOUNT_TYPE_ZIP,
G_UNIX_MOUNT_TYPE_JAZ,
G_UNIX_MOUNT_TYPE_MEMSTICK,
G_UNIX_MOUNT_TYPE_CF,
G_UNIX_MOUNT_TYPE_SM,
G_UNIX_MOUNT_TYPE_SDMMC,
G_UNIX_MOUNT_TYPE_IPOD,
G_UNIX_MOUNT_TYPE_CAMERA,
G_UNIX_MOUNT_TYPE_HD
} GUnixMountType;
struct _GUnixMountEntry {
char *mount_path;
char *device_path;
char *root_path;
char *filesystem_type;
char *options;
gboolean is_read_only;
gboolean is_system_internal;
};
G_DEFINE_BOXED_TYPE (GUnixMountEntry, g_unix_mount_entry,
g_unix_mount_copy, g_unix_mount_free)
struct _GUnixMountPoint {
char *mount_path;
char *device_path;
char *filesystem_type;
char *options;
gboolean is_read_only;
gboolean is_user_mountable;
gboolean is_loopback;
};
G_DEFINE_BOXED_TYPE (GUnixMountPoint, g_unix_mount_point,
g_unix_mount_point_copy, g_unix_mount_point_free)
static GList *_g_get_unix_mounts (void);
static GList *_g_get_unix_mount_points (void);
static gboolean proc_mounts_watch_is_running (void);
G_LOCK_DEFINE_STATIC (proc_mounts_source);
/* Protected by proc_mounts_source lock */
static guint64 mount_poller_time = 0;
static GSource *proc_mounts_watch_source = NULL;
#ifdef HAVE_SYS_MNTTAB_H
#define MNTOPT_RO "ro"
#endif
#ifdef HAVE_MNTENT_H
#include <mntent.h>
#ifdef HAVE_LIBMOUNT
#include <libmount.h>
#endif
#elif defined (HAVE_SYS_MNTTAB_H)
#include <sys/mnttab.h>
#if defined(__sun) && !defined(mnt_opts)
#define mnt_opts mnt_mntopts
#endif
#endif
#ifdef HAVE_SYS_VFSTAB_H
#include <sys/vfstab.h>
#endif
#if defined(HAVE_SYS_MNTCTL_H) && defined(HAVE_SYS_VMOUNT_H) && defined(HAVE_SYS_VFS_H)
#include <sys/mntctl.h>
#include <sys/vfs.h>
#include <sys/vmount.h>
#include <fshelp.h>
#endif
#if (defined(HAVE_GETVFSSTAT) || defined(HAVE_GETFSSTAT)) && defined(HAVE_FSTAB_H) && defined(HAVE_SYS_MOUNT_H)
#include <sys/param.h>
#include <sys/ucred.h>
#include <sys/mount.h>
#include <fstab.h>
#ifdef HAVE_SYS_SYSCTL_H
#include <sys/sysctl.h>
#endif
#endif
#ifndef HAVE_SETMNTENT
#define setmntent(f,m) fopen(f,m)
#endif
#ifndef HAVE_ENDMNTENT
#define endmntent(f) fclose(f)
#endif
#ifdef HAVE_LIBMOUNT
/* Protected by proc_mounts_source lock */
static struct libmnt_monitor *proc_mounts_monitor = NULL;
#endif
static gboolean
is_in (const char *value, const char *set[])
{
int i;
for (i = 0; set[i] != NULL; i++)
{
if (strcmp (set[i], value) == 0)
return TRUE;
}
return FALSE;
}
/**
* g_unix_is_mount_path_system_internal:
* @mount_path: (type filename): a mount path, e.g. `/media/disk` or `/usr`
*
* Determines if @mount_path is considered an implementation of the
* OS. This is primarily used for hiding mountable and mounted volumes
* that only are used in the OS and has little to no relevance to the
* casual user.
*
* Returns: %TRUE if @mount_path is considered an implementation detail
* of the OS.
**/
gboolean
g_unix_is_mount_path_system_internal (const char *mount_path)
{
const char *ignore_mountpoints[] = {
/* Includes all FHS 2.3 toplevel dirs and other specialized
* directories that we want to hide from the user.
*/
"/", /* we already have "Filesystem root" in Nautilus */
"/bin",
"/boot",
"/compat/linux/proc",
"/compat/linux/sys",
"/dev",
"/etc",
"/home",
"/lib",
"/lib64",
"/libexec",
"/live/cow",
"/live/image",
"/media",
"/mnt",
"/opt",
"/rescue",
"/root",
"/sbin",
"/srv",
"/tmp",
"/usr",
"/usr/X11R6",
"/usr/local",
"/usr/obj",
"/usr/ports",
"/usr/src",
"/usr/xobj",
"/var",
"/var/crash",
"/var/local",
GLIB_LOCALSTATEDIR,
"/var/log",
"/var/log/audit", /* https://bugzilla.redhat.com/show_bug.cgi?id=333041 */
"/var/mail",
"/var/run",
GLIB_RUNSTATEDIR,
"/var/tmp", /* https://bugzilla.redhat.com/show_bug.cgi?id=335241 */
"/proc",
"/sbin",
"/net",
"/sys",
NULL
};
if (is_in (mount_path, ignore_mountpoints))
return TRUE;
if (g_str_has_prefix (mount_path, "/dev/") ||
g_str_has_prefix (mount_path, "/proc/") ||
g_str_has_prefix (mount_path, "/sys/"))
return TRUE;
if (g_str_has_suffix (mount_path, "/.gvfs"))
return TRUE;
return FALSE;
}
/**
* g_unix_is_system_fs_type:
* @fs_type: a file system type, e.g. `procfs` or `tmpfs`
*
* Determines if @fs_type is considered a type of file system which is only
* used in implementation of the OS. This is primarily used for hiding
* mounted volumes that are intended as APIs for programs to read, and system
* administrators at a shell; rather than something that should, for example,
* appear in a GUI. For example, the Linux `/proc` filesystem.
*
* The list of file system types considered ‘system’ ones may change over time.
*
* Returns: %TRUE if @fs_type is considered an implementation detail of the OS.
* Since: 2.56
*/
gboolean
g_unix_is_system_fs_type (const char *fs_type)
{
const char *ignore_fs[] = {
"adfs",
"afs",
"auto",
"autofs",
"autofs4",
"cgroup",
"configfs",
"cxfs",
"debugfs",
"devfs",
"devpts",
"devtmpfs",
"ecryptfs",
"fdescfs",
"fusectl",
"gfs",
"gfs2",
"gpfs",
"hugetlbfs",
"kernfs",
"linprocfs",
"linsysfs",
"lustre",
"lustre_lite",
"mfs",
"mqueue",
"ncpfs",
"nfsd",
"nullfs",
"ocfs2",
"overlay",
"proc",
"procfs",
"pstore",
"ptyfs",
"rootfs",
"rpc_pipefs",
"securityfs",
"selinuxfs",
"sysfs",
"tmpfs",
"usbfs",
NULL
};
g_return_val_if_fail (fs_type != NULL && *fs_type != '\0', FALSE);
return is_in (fs_type, ignore_fs);
}
/**
* g_unix_is_system_device_path:
* @device_path: a device path, e.g. `/dev/loop0` or `nfsd`
*
* Determines if @device_path is considered a block device path which is only
* used in implementation of the OS. This is primarily used for hiding
* mounted volumes that are intended as APIs for programs to read, and system
* administrators at a shell; rather than something that should, for example,
* appear in a GUI. For example, the Linux `/proc` filesystem.
*
* The list of device paths considered ‘system’ ones may change over time.
*
* Returns: %TRUE if @device_path is considered an implementation detail of
* the OS.
* Since: 2.56
*/
gboolean
g_unix_is_system_device_path (const char *device_path)
{
const char *ignore_devices[] = {
"none",
"sunrpc",
"devpts",
"nfsd",
"/dev/loop",
"/dev/vn",
NULL
};
g_return_val_if_fail (device_path != NULL && *device_path != '\0', FALSE);
return is_in (device_path, ignore_devices);
}
static gboolean
guess_system_internal (const char *mountpoint,
const char *fs,
const char *device,
const char *root)
{
if (g_unix_is_system_fs_type (fs))
return TRUE;
if (g_unix_is_system_device_path (device))
return TRUE;
if (g_unix_is_mount_path_system_internal (mountpoint))
return TRUE;
/* It is not possible to reliably detect mounts which were created by bind
* operation. mntent-based _g_get_unix_mounts() implementation blindly skips
* mounts with a device path that is repeated (e.g. mounts created by bind
* operation, btrfs subvolumes). This usually chooses the most important
* mounts (i.e. which points to the root of filesystem), but it doesn't work
* in all cases and also it is not ideal that those mounts are completely
* ignored (e.g. x-gvfs-show doesn't work for them, trash backend can't handle
* files on btrfs subvolumes). libmount-based _g_get_unix_mounts()
* implementation provides a root path. So there is no need to completely
* ignore those mounts, because e.g. our volume monitors can use the root path
* to not mengle those mounts with the "regular" mounts (i.e. which points to
* the root). But because those mounts usually just duplicate other mounts and
* are completely ignored with mntend-based implementation, let's mark them as
* system internal. Given the different approaches it doesn't mean that all
* mounts which were ignored will be system internal now, but this should work
* in most cases. For more info, see g_unix_mount_get_root_path() annotation,
* comment in mntent-based _g_get_unix_mounts() implementation and the
* https://gitlab.gnome.org/GNOME/glib/issues/1271 issue.
*/
if (root != NULL && g_strcmp0 (root, "/") != 0)
return TRUE;
return FALSE;
}
/* GUnixMounts (ie: mtab) implementations {{{1 */
static GUnixMountEntry *
create_unix_mount_entry (const char *device_path,
const char *mount_path,
const char *root_path,
const char *filesystem_type,
const char *options,
gboolean is_read_only)
{
GUnixMountEntry *mount_entry = NULL;
mount_entry = g_new0 (GUnixMountEntry, 1);
mount_entry->device_path = g_strdup (device_path);
mount_entry->mount_path = g_strdup (mount_path);
mount_entry->root_path = g_strdup (root_path);
mount_entry->filesystem_type = g_strdup (filesystem_type);
mount_entry->options = g_strdup (options);
mount_entry->is_read_only = is_read_only;
mount_entry->is_system_internal =
guess_system_internal (mount_entry->mount_path,
mount_entry->filesystem_type,
mount_entry->device_path,
mount_entry->root_path);
return mount_entry;
}
static GUnixMountPoint *
create_unix_mount_point (const char *device_path,
const char *mount_path,
const char *filesystem_type,
const char *options,
gboolean is_read_only,
gboolean is_user_mountable,
gboolean is_loopback)
{
GUnixMountPoint *mount_point = NULL;
mount_point = g_new0 (GUnixMountPoint, 1);
mount_point->device_path = g_strdup (device_path);
mount_point->mount_path = g_strdup (mount_path);
mount_point->filesystem_type = g_strdup (filesystem_type);
mount_point->options = g_strdup (options);
mount_point->is_read_only = is_read_only;
mount_point->is_user_mountable = is_user_mountable;
mount_point->is_loopback = is_loopback;
return mount_point;
}
/* mntent.h (Linux, GNU, NSS) {{{2 */
#ifdef HAVE_MNTENT_H
#ifdef HAVE_LIBMOUNT
/* For documentation on /proc/self/mountinfo see
* http://www.kernel.org/doc/Documentation/filesystems/proc.txt
*/
#define PROC_MOUNTINFO_PATH "/proc/self/mountinfo"
static GList *
_g_get_unix_mounts (void)
{
struct libmnt_table *table = NULL;
struct libmnt_iter* iter = NULL;
struct libmnt_fs *fs = NULL;
GUnixMountEntry *mount_entry = NULL;
GList *return_list = NULL;
table = mnt_new_table ();
if (mnt_table_parse_mtab (table, NULL) < 0)
goto out;
iter = mnt_new_iter (MNT_ITER_FORWARD);
while (mnt_table_next_fs (table, iter, &fs) == 0)
{
const char *device_path = NULL;
char *mount_options = NULL;
unsigned long mount_flags = 0;
gboolean is_read_only = FALSE;
device_path = mnt_fs_get_source (fs);
if (g_strcmp0 (device_path, "/dev/root") == 0)
device_path = _resolve_dev_root ();
mount_options = mnt_fs_strdup_options (fs);
if (mount_options)
{
mnt_optstr_get_flags (mount_options, &mount_flags, mnt_get_builtin_optmap (MNT_LINUX_MAP));
g_free (mount_options);
}
is_read_only = (mount_flags & MS_RDONLY) ? TRUE : FALSE;
mount_entry = create_unix_mount_entry (device_path,
mnt_fs_get_target (fs),
mnt_fs_get_root (fs),
mnt_fs_get_fstype (fs),
mnt_fs_get_options (fs),
is_read_only);
return_list = g_list_prepend (return_list, mount_entry);
}
mnt_free_iter (iter);
out:
mnt_free_table (table);
return g_list_reverse (return_list);
}
#else
static const char *
get_mtab_read_file (void)
{
#ifdef _PATH_MOUNTED
# ifdef __linux__
return "/proc/mounts";
# else
return _PATH_MOUNTED;
# endif
#else
return "/etc/mtab";
#endif
}
#ifndef HAVE_GETMNTENT_R
G_LOCK_DEFINE_STATIC(getmntent);
#endif
static GList *
_g_get_unix_mounts (void)
{
#ifdef HAVE_GETMNTENT_R
struct mntent ent;
char buf[1024];
#endif
struct mntent *mntent;
FILE *file;
const char *read_file;
GUnixMountEntry *mount_entry;
GHashTable *mounts_hash;
GList *return_list;
read_file = get_mtab_read_file ();
file = setmntent (read_file, "re");
if (file == NULL)
return NULL;
return_list = NULL;
mounts_hash = g_hash_table_new (g_str_hash, g_str_equal);
#ifdef HAVE_GETMNTENT_R
while ((mntent = getmntent_r (file, &ent, buf, sizeof (buf))) != NULL)
#else
G_LOCK (getmntent);
while ((mntent = getmntent (file)) != NULL)
#endif
{
const char *device_path = NULL;
gboolean is_read_only = FALSE;
/* ignore any mnt_fsname that is repeated and begins with a '/'
*
* We do this to avoid being fooled by --bind mounts, since
* these have the same device as the location they bind to.
* It's not an ideal solution to the problem, but it's likely that
* the most important mountpoint is first and the --bind ones after
* that aren't as important. So it should work.
*
* The '/' is to handle procfs, tmpfs and other no device mounts.
*/
if (mntent->mnt_fsname != NULL &&
mntent->mnt_fsname[0] == '/' &&
g_hash_table_lookup (mounts_hash, mntent->mnt_fsname))
continue;
if (g_strcmp0 (mntent->mnt_fsname, "/dev/root") == 0)
device_path = _resolve_dev_root ();
else
device_path = mntent->mnt_fsname;
#if defined (HAVE_HASMNTOPT)
if (hasmntopt (mntent, MNTOPT_RO) != NULL)
is_read_only = TRUE;
#endif
mount_entry = create_unix_mount_entry (device_path,
mntent->mnt_dir,
NULL,
mntent->mnt_type,
mntent->mnt_opts,
is_read_only);
g_hash_table_insert (mounts_hash,
mount_entry->device_path,
mount_entry->device_path);
return_list = g_list_prepend (return_list, mount_entry);
}
g_hash_table_destroy (mounts_hash);
endmntent (file);
#ifndef HAVE_GETMNTENT_R
G_UNLOCK (getmntent);
#endif
return g_list_reverse (return_list);
}
#endif /* HAVE_LIBMOUNT */
static const char *
get_mtab_monitor_file (void)
{
static const char *mountinfo_path = NULL;
#ifdef HAVE_LIBMOUNT
struct stat buf;
#endif
if (mountinfo_path != NULL)
return mountinfo_path;
#ifdef HAVE_LIBMOUNT
/* The mtab file is still used by some distros, so it has to be monitored in
* order to avoid races between g_unix_mounts_get and "mounts-changed" signal:
* https://bugzilla.gnome.org/show_bug.cgi?id=782814
*/
if (mnt_has_regular_mtab (&mountinfo_path, NULL))
{
return mountinfo_path;
}
if (stat (PROC_MOUNTINFO_PATH, &buf) == 0)
{
mountinfo_path = PROC_MOUNTINFO_PATH;
return mountinfo_path;
}
#endif
#ifdef _PATH_MOUNTED
# ifdef __linux__
mountinfo_path = "/proc/mounts";
# else
mountinfo_path = _PATH_MOUNTED;
# endif
#else
mountinfo_path = "/etc/mtab";
#endif
return mountinfo_path;
}
/* mnttab.h {{{2 */
#elif defined (HAVE_SYS_MNTTAB_H)
G_LOCK_DEFINE_STATIC(getmntent);
static const char *
get_mtab_read_file (void)
{
#ifdef _PATH_MOUNTED
return _PATH_MOUNTED;
#else
return "/etc/mnttab";
#endif
}
static const char *
get_mtab_monitor_file (void)
{
return get_mtab_read_file ();
}
static GList *
_g_get_unix_mounts (void)
{
struct mnttab mntent;
FILE *file;
const char *read_file;
GUnixMountEntry *mount_entry;
GList *return_list;
read_file = get_mtab_read_file ();
file = setmntent (read_file, "re");
if (file == NULL)
return NULL;
return_list = NULL;
G_LOCK (getmntent);
while (! getmntent (file, &mntent))
{
gboolean is_read_only = FALSE;
#if defined (HAVE_HASMNTOPT)
if (hasmntopt (&mntent, MNTOPT_RO) != NULL)
is_read_only = TRUE;
#endif
mount_entry = create_unix_mount_entry (mntent.mnt_special,
mntent.mnt_mountp,
NULL,
mntent.mnt_fstype,
mntent.mnt_opts,
is_read_only);
return_list = g_list_prepend (return_list, mount_entry);
}
endmntent (file);
G_UNLOCK (getmntent);
return g_list_reverse (return_list);
}
/* mntctl.h (AIX) {{{2 */
#elif defined(HAVE_SYS_MNTCTL_H) && defined(HAVE_SYS_VMOUNT_H) && defined(HAVE_SYS_VFS_H)
static const char *
get_mtab_monitor_file (void)
{
return NULL;
}
static GList *
_g_get_unix_mounts (void)
{
struct vfs_ent *fs_info;
struct vmount *vmount_info;
int vmount_number;
unsigned int vmount_size;
int current;
GList *return_list;
if (mntctl (MCTL_QUERY, sizeof (vmount_size), &vmount_size) != 0)
{
g_warning ("Unable to know the number of mounted volumes");
return NULL;
}
vmount_info = (struct vmount*)g_malloc (vmount_size);
vmount_number = mntctl (MCTL_QUERY, vmount_size, vmount_info);
if (vmount_info->vmt_revision != VMT_REVISION)
g_warning ("Bad vmount structure revision number, want %d, got %d", VMT_REVISION, vmount_info->vmt_revision);
if (vmount_number < 0)
{
g_warning ("Unable to recover mounted volumes information");
g_free (vmount_info);
return NULL;
}
return_list = NULL;
while (vmount_number > 0)
{
gboolean is_read_only = FALSE;
fs_info = getvfsbytype (vmount_info->vmt_gfstype);
/* is_removable = (vmount_info->vmt_flags & MNT_REMOVABLE) ? 1 : 0; */
is_read_only = (vmount_info->vmt_flags & MNT_READONLY) ? 1 : 0;
mount_entry = create_unix_mount_entry (vmt2dataptr (vmount_info, VMT_OBJECT),
vmt2dataptr (vmount_info, VMT_STUB),
NULL,
fs_info == NULL ? "unknown" : fs_info->vfsent_name,
NULL,
is_read_only);
return_list = g_list_prepend (return_list, mount_entry);
vmount_info = (struct vmount *)( (char*)vmount_info
+ vmount_info->vmt_length);
vmount_number--;
}
g_free (vmount_info);
return g_list_reverse (return_list);
}
/* sys/mount.h {{{2 */
#elif (defined(HAVE_GETVFSSTAT) || defined(HAVE_GETFSSTAT)) && defined(HAVE_FSTAB_H) && defined(HAVE_SYS_MOUNT_H)
static const char *
get_mtab_monitor_file (void)
{
return NULL;
}
static GList *
_g_get_unix_mounts (void)
{
#if defined(USE_STATVFS)
struct statvfs *mntent = NULL;
#elif defined(USE_STATFS)
struct statfs *mntent = NULL;
#else
#error statfs juggling failed
#endif
size_t bufsize;
int num_mounts, i;
GUnixMountEntry *mount_entry;
GList *return_list;
/* Pass NOWAIT to avoid blocking trying to update NFS mounts. */
#if defined(USE_STATVFS) && defined(HAVE_GETVFSSTAT)
num_mounts = getvfsstat (NULL, 0, ST_NOWAIT);
#elif defined(USE_STATFS) && defined(HAVE_GETFSSTAT)
num_mounts = getfsstat (NULL, 0, MNT_NOWAIT);
#endif
if (num_mounts == -1)
return NULL;
bufsize = num_mounts * sizeof (*mntent);
mntent = g_malloc (bufsize);
#if defined(USE_STATVFS) && defined(HAVE_GETVFSSTAT)
num_mounts = getvfsstat (mntent, bufsize, ST_NOWAIT);
#elif defined(USE_STATFS) && defined(HAVE_GETFSSTAT)
num_mounts = getfsstat (mntent, bufsize, MNT_NOWAIT);
#endif
if (num_mounts == -1)
return NULL;
return_list = NULL;
for (i = 0; i < num_mounts; i++)
{
gboolean is_read_only = FALSE;
#if defined(USE_STATVFS)
if (mntent[i].f_flag & ST_RDONLY)
#elif defined(USE_STATFS)
if (mntent[i].f_flags & MNT_RDONLY)
#else
#error statfs juggling failed
#endif
is_read_only = TRUE;
mount_entry = create_unix_mount_entry (mntent[i].f_mntfromname,
mntent[i].f_mntonname,
NULL,
mntent[i].f_fstypename,
NULL,
is_read_only);
return_list = g_list_prepend (return_list, mount_entry);
}
g_free (mntent);
return g_list_reverse (return_list);
}
/* Interix {{{2 */
#elif defined(__INTERIX)
static const char *
get_mtab_monitor_file (void)
{
return NULL;
}
static GList *
_g_get_unix_mounts (void)
{
DIR *dirp;
GList* return_list = NULL;
char filename[9 + NAME_MAX];
dirp = opendir ("/dev/fs");
if (!dirp)
{
g_warning ("unable to read /dev/fs!");
return NULL;
}
while (1)
{
struct statvfs statbuf;
struct dirent entry;
struct dirent* result;
if (readdir_r (dirp, &entry, &result) || result == NULL)
break;
strcpy (filename, "/dev/fs/");
strcat (filename, entry.d_name);
if (statvfs (filename, &statbuf) == 0)
{
GUnixMountEntry* mount_entry = g_new0(GUnixMountEntry, 1);
mount_entry->mount_path = g_strdup (statbuf.f_mntonname);
mount_entry->device_path = g_strdup (statbuf.f_mntfromname);
mount_entry->filesystem_type = g_strdup (statbuf.f_fstypename);
if (statbuf.f_flag & ST_RDONLY)
mount_entry->is_read_only = TRUE;
return_list = g_list_prepend(return_list, mount_entry);
}
}
return_list = g_list_reverse (return_list);
closedir (dirp);
return return_list;
}
/* QNX {{{2 */
#elif defined (HAVE_QNX)
static char *
get_mtab_monitor_file (void)
{
/* TODO: Not implemented */
return NULL;
}
static GList *
_g_get_unix_mounts (void)
{
/* TODO: Not implemented */
return NULL;
}
/* Common code {{{2 */
#else
#error No _g_get_unix_mounts() implementation for system
#endif
/* GUnixMountPoints (ie: fstab) implementations {{{1 */
/* _g_get_unix_mount_points():
* read the fstab.
* don't return swap and ignore mounts.
*/
static char *
get_fstab_file (void)
{
#ifdef HAVE_LIBMOUNT
return (char *) mnt_get_fstab_path ();
#else
#if defined(HAVE_SYS_MNTCTL_H) && defined(HAVE_SYS_VMOUNT_H) && defined(HAVE_SYS_VFS_H)
/* AIX */
return "/etc/filesystems";
#elif defined(_PATH_MNTTAB)
return _PATH_MNTTAB;
#elif defined(VFSTAB)
return VFSTAB;
#else
return "/etc/fstab";
#endif
#endif
}
/* mntent.h (Linux, GNU, NSS) {{{2 */
#ifdef HAVE_MNTENT_H
#ifdef HAVE_LIBMOUNT
static GList *
_g_get_unix_mount_points (void)
{
struct libmnt_table *table = NULL;
struct libmnt_iter* iter = NULL;
struct libmnt_fs *fs = NULL;
GUnixMountPoint *mount_point = NULL;
GList *return_list = NULL;
table = mnt_new_table ();
if (mnt_table_parse_fstab (table, NULL) < 0)
goto out;
iter = mnt_new_iter (MNT_ITER_FORWARD);
while (mnt_table_next_fs (table, iter, &fs) == 0)
{
const char *device_path = NULL;
const char *mount_path = NULL;
const char *mount_fstype = NULL;
char *mount_options = NULL;
gboolean is_read_only = FALSE;
gboolean is_user_mountable = FALSE;
gboolean is_loopback = FALSE;
mount_path = mnt_fs_get_target (fs);
if ((strcmp (mount_path, "ignore") == 0) ||
(strcmp (mount_path, "swap") == 0) ||
(strcmp (mount_path, "none") == 0))
continue;
mount_fstype = mnt_fs_get_fstype (fs);
mount_options = mnt_fs_strdup_options (fs);
if (mount_options)
{
unsigned long mount_flags = 0;
unsigned long userspace_flags = 0;
mnt_optstr_get_flags (mount_options, &mount_flags, mnt_get_builtin_optmap (MNT_LINUX_MAP));
mnt_optstr_get_flags (mount_options, &userspace_flags, mnt_get_builtin_optmap (MNT_USERSPACE_MAP));
/* We ignore bind fstab entries, as we ignore bind mounts anyway */
if (mount_flags & MS_BIND)
{
g_free (mount_options);
continue;
}
is_read_only = (mount_flags & MS_RDONLY) != 0;
is_loopback = (userspace_flags & MNT_MS_LOOP) != 0;
if ((mount_fstype != NULL && g_strcmp0 ("supermount", mount_fstype) == 0) ||
((userspace_flags & MNT_MS_USER) &&
(g_strstr_len (mount_options, -1, "user_xattr") == NULL)) ||
(userspace_flags & MNT_MS_USERS) ||
(userspace_flags & MNT_MS_OWNER))
{
is_user_mountable = TRUE;
}
}
device_path = mnt_fs_get_source (fs);
if (g_strcmp0 (device_path, "/dev/root") == 0)
device_path = _resolve_dev_root ();
mount_point = create_unix_mount_point (device_path,
mount_path,
mount_fstype,
mount_options,
is_read_only,
is_user_mountable,
is_loopback);
if (mount_options)
g_free (mount_options);
return_list = g_list_prepend (return_list, mount_point);
}
mnt_free_iter (iter);
out:
mnt_free_table (table);
return g_list_reverse (return_list);
}
#else
static GList *
_g_get_unix_mount_points (void)
{
#ifdef HAVE_GETMNTENT_R
struct mntent ent;
char buf[1024];
#endif
struct mntent *mntent;
FILE *file;
char *read_file;
GUnixMountPoint *mount_point;
GList *return_list;
read_file = get_fstab_file ();
file = setmntent (read_file, "re");
if (file == NULL)
return NULL;
return_list = NULL;
#ifdef HAVE_GETMNTENT_R
while ((mntent = getmntent_r (file, &ent, buf, sizeof (buf))) != NULL)
#else
G_LOCK (getmntent);
while ((mntent = getmntent (file)) != NULL)
#endif
{
const char *device_path = NULL;
gboolean is_read_only = FALSE;
gboolean is_user_mountable = FALSE;
gboolean is_loopback = FALSE;
if ((strcmp (mntent->mnt_dir, "ignore") == 0) ||
(strcmp (mntent->mnt_dir, "swap") == 0) ||
(strcmp (mntent->mnt_dir, "none") == 0))
continue;
#ifdef HAVE_HASMNTOPT
/* We ignore bind fstab entries, as we ignore bind mounts anyway */
if (hasmntopt (mntent, "bind"))
continue;
#endif
if (strcmp (mntent->mnt_fsname, "/dev/root") == 0)
device_path = _resolve_dev_root ();
else
device_path = mntent->mnt_fsname;
#ifdef HAVE_HASMNTOPT
if (hasmntopt (mntent, MNTOPT_RO) != NULL)
is_read_only = TRUE;
if (hasmntopt (mntent, "loop") != NULL)
is_loopback = TRUE;
#endif
if ((mntent->mnt_type != NULL && strcmp ("supermount", mntent->mnt_type) == 0)
#ifdef HAVE_HASMNTOPT
|| (hasmntopt (mntent, "user") != NULL
&& hasmntopt (mntent, "user") != hasmntopt (mntent, "user_xattr"))
|| hasmntopt (mntent, "users") != NULL
|| hasmntopt (mntent, "owner") != NULL
#endif
)
is_user_mountable = TRUE;
mount_point = create_unix_mount_point (device_path,
mntent->mnt_dir,
mntent->mnt_type,
mntent->mnt_opts,
is_read_only,
is_user_mountable,
is_loopback);
return_list = g_list_prepend (return_list, mount_point);
}
endmntent (file);
#ifndef HAVE_GETMNTENT_R
G_UNLOCK (getmntent);
#endif
return g_list_reverse (return_list);
}
#endif /* HAVE_LIBMOUNT */
/* mnttab.h {{{2 */
#elif defined (HAVE_SYS_MNTTAB_H)
static GList *
_g_get_unix_mount_points (void)
{
struct mnttab mntent;
FILE *file;
char *read_file;
GUnixMountPoint *mount_point;
GList *return_list;
read_file = get_fstab_file ();
file = setmntent (read_file, "re");
if (file == NULL)
return NULL;
return_list = NULL;
G_LOCK (getmntent);
while (! getmntent (file, &mntent))
{
gboolean is_read_only = FALSE;
gboolean is_user_mountable = FALSE;
gboolean is_loopback = FALSE;
if ((strcmp (mntent.mnt_mountp, "ignore") == 0) ||
(strcmp (mntent.mnt_mountp, "swap") == 0) ||
(strcmp (mntent.mnt_mountp, "none") == 0))
continue;
#ifdef HAVE_HASMNTOPT
if (hasmntopt (&mntent, MNTOPT_RO) != NULL)
is_read_only = TRUE;
if (hasmntopt (&mntent, "lofs") != NULL)
is_loopback = TRUE;
#endif
if ((mntent.mnt_fstype != NULL)
#ifdef HAVE_HASMNTOPT
|| (hasmntopt (&mntent, "user") != NULL
&& hasmntopt (&mntent, "user") != hasmntopt (&mntent, "user_xattr"))
|| hasmntopt (&mntent, "users") != NULL
|| hasmntopt (&mntent, "owner") != NULL
#endif
)
is_user_mountable = TRUE;
mount_point = create_unix_mount_point (mntent.mnt_special,
mntent.mnt_mountp,
mntent.mnt_fstype,
mntent.mnt_mntopts,
is_read_only,
is_user_mountable,
is_loopback);
return_list = g_list_prepend (return_list, mount_point);
}
endmntent (file);
G_UNLOCK (getmntent);
return g_list_reverse (return_list);
}
/* mntctl.h (AIX) {{{2 */
#elif defined(HAVE_SYS_MNTCTL_H) && defined(HAVE_SYS_VMOUNT_H) && defined(HAVE_SYS_VFS_H)
/* functions to parse /etc/filesystems on aix */
/* read character, ignoring comments (begin with '*', end with '\n' */
static int
aix_fs_getc (FILE *fd)
{
int c;
while ((c = getc (fd)) == '*')
{
while (((c = getc (fd)) != '\n') && (c != EOF))
;
}
}
/* eat all continuous spaces in a file */
static int
aix_fs_ignorespace (FILE *fd)
{
int c;
while ((c = aix_fs_getc (fd)) != EOF)
{
if (!g_ascii_isspace (c))
{
ungetc (c,fd);
return c;
}
}
return EOF;
}
/* read one word from file */
static int
aix_fs_getword (FILE *fd,
char *word)
{
int c;
aix_fs_ignorespace (fd);
while (((c = aix_fs_getc (fd)) != EOF) && !g_ascii_isspace (c))
{
if (c == '"')
{
while (((c = aix_fs_getc (fd)) != EOF) && (c != '"'))
*word++ = c;
else
*word++ = c;
}
}
*word = 0;
return c;
}
typedef struct {
char mnt_mount[PATH_MAX];
char mnt_special[PATH_MAX];
char mnt_fstype[16];
char mnt_options[128];
} AixMountTableEntry;
/* read mount points properties */
static int
aix_fs_get (FILE *fd,
AixMountTableEntry *prop)
{
static char word[PATH_MAX] = { 0 };
char value[PATH_MAX];
/* read stanza */
if (word[0] == 0)
{
if (aix_fs_getword (fd, word) == EOF)
return EOF;
}
word[strlen(word) - 1] = 0;
strcpy (prop->mnt_mount, word);
/* read attributes and value */
while (aix_fs_getword (fd, word) != EOF)
{
/* test if is attribute or new stanza */
if (word[strlen(word) - 1] == ':')
return 0;
/* read "=" */
aix_fs_getword (fd, value);
/* read value */
aix_fs_getword (fd, value);
if (strcmp (word, "dev") == 0)
strcpy (prop->mnt_special, value);
else if (strcmp (word, "vfs") == 0)
strcpy (prop->mnt_fstype, value);
else if (strcmp (word, "options") == 0)
strcpy(prop->mnt_options, value);
}
return 0;
}
static GList *
_g_get_unix_mount_points (void)
{
struct mntent *mntent;
FILE *file;
char *read_file;
GUnixMountPoint *mount_point;
AixMountTableEntry mntent;
GList *return_list;
read_file = get_fstab_file ();
file = setmntent (read_file, "re");
if (file == NULL)
return NULL;
return_list = NULL;
while (!aix_fs_get (file, &mntent))
{
if (strcmp ("cdrfs", mntent.mnt_fstype) == 0)
{
mount_point = create_unix_mount_point (mntent.mnt_special,
mntent.mnt_mount,
mntent.mnt_fstype,
mntent.mnt_options,
TRUE,
TRUE,
FALSE);
return_list = g_list_prepend (return_list, mount_point);
}
}
endmntent (file);
return g_list_reverse (return_list);
}
#elif (defined(HAVE_GETVFSSTAT) || defined(HAVE_GETFSSTAT)) && defined(HAVE_FSTAB_H) && defined(HAVE_SYS_MOUNT_H)
static GList *
_g_get_unix_mount_points (void)
{
struct fstab *fstab = NULL;
GUnixMountPoint *mount_point;
GList *return_list = NULL;
G_LOCK_DEFINE_STATIC (fsent);
#ifdef HAVE_SYS_SYSCTL_H
uid_t uid = getuid ();
int usermnt = 0;
struct stat sb;
#endif
#ifdef HAVE_SYS_SYSCTL_H
#if defined(HAVE_SYSCTLBYNAME)
{
size_t len = sizeof(usermnt);
sysctlbyname ("vfs.usermount", &usermnt, &len, NULL, 0);
}
#elif defined(CTL_VFS) && defined(VFS_USERMOUNT)
{
int mib[2];
size_t len = sizeof(usermnt);
mib[0] = CTL_VFS;
mib[1] = VFS_USERMOUNT;
sysctl (mib, 2, &usermnt, &len, NULL, 0);
}
#elif defined(CTL_KERN) && defined(KERN_USERMOUNT)
{
int mib[2];
size_t len = sizeof(usermnt);
mib[0] = CTL_KERN;
mib[1] = KERN_USERMOUNT;
sysctl (mib, 2, &usermnt, &len, NULL, 0);
}
#endif
#endif
G_LOCK (fsent);
if (!setfsent ())
{
G_UNLOCK (fsent);
return NULL;
}
while ((fstab = getfsent ()) != NULL)
{
gboolean is_read_only = FALSE;
gboolean is_user_mountable = FALSE;
if (strcmp (fstab->fs_vfstype, "swap") == 0)
continue;
if (strcmp (fstab->fs_type, "ro") == 0)
is_read_only = TRUE;
#ifdef HAVE_SYS_SYSCTL_H
if (usermnt != 0)
{
if (uid == 0 ||
(stat (fstab->fs_file, &sb) == 0 && sb.st_uid == uid))
{
is_user_mountable = TRUE;
}
}
#endif
mount_point = create_unix_mount_point (fstab->fs_spec,
fstab->fs_file,
fstab->fs_vfstype,
fstab->fs_mntops,
is_read_only,
is_user_mountable,
FALSE);
return_list = g_list_prepend (return_list, mount_point);
}
endfsent ();
G_UNLOCK (fsent);
return g_list_reverse (return_list);
}
/* Interix {{{2 */
#elif defined(__INTERIX)
static GList *
_g_get_unix_mount_points (void)
{
return _g_get_unix_mounts ();
}
/* QNX {{{2 */
#elif defined (HAVE_QNX)
static GList *
_g_get_unix_mount_points (void)
{
return _g_get_unix_mounts ();
}
/* Common code {{{2 */
#else
#error No g_get_mount_table() implementation for system
#endif
static guint64
get_mounts_timestamp (void)
{
const char *monitor_file;
struct stat buf;
guint64 timestamp = 0;
G_LOCK (proc_mounts_source);
monitor_file = get_mtab_monitor_file ();
/* Don't return mtime for /proc/ files */
if (monitor_file && !g_str_has_prefix (monitor_file, "/proc/"))
{
if (stat (monitor_file, &buf) == 0)
timestamp = buf.st_mtime;
}
else if (proc_mounts_watch_is_running ())
{
/* it's being monitored by poll, so return mount_poller_time */
timestamp = mount_poller_time;
}
else
{
/* Case of /proc/ file not being monitored - Be on the safe side and
* send a new timestamp to force g_unix_mounts_changed_since() to
* return TRUE so any application caches depending on it (like eg.
* the one in GIO) get invalidated and don't hold possibly outdated
* data - see Bug 787731 */
timestamp = g_get_monotonic_time ();
}
G_UNLOCK (proc_mounts_source);
return timestamp;
}
static guint64
get_mount_points_timestamp (void)
{
const char *monitor_file;
struct stat buf;
monitor_file = get_fstab_file ();
if (monitor_file)
{
if (stat (monitor_file, &buf) == 0)
return (guint64)buf.st_mtime;
}
return 0;
}
/**
* g_unix_mounts_get:
* @time_read: (out) (optional): guint64 to contain a timestamp, or %NULL
*
* Gets a #GList of #GUnixMountEntry containing the unix mounts.
* If @time_read is set, it will be filled with the mount
* timestamp, allowing for checking if the mounts have changed
* with g_unix_mounts_changed_since().
*
* Returns: (element-type GUnixMountEntry) (transfer full):
* a #GList of the UNIX mounts.
**/
GList *
g_unix_mounts_get (guint64 *time_read)
{
if (time_read)
*time_read = get_mounts_timestamp ();
return _g_get_unix_mounts ();
}
/**
* g_unix_mount_at:
* @mount_path: (type filename): path for a possible unix mount.
* @time_read: (out) (optional): guint64 to contain a timestamp.
*
* Gets a #GUnixMountEntry for a given mount path. If @time_read
* is set, it will be filled with a unix timestamp for checking
* if the mounts have changed since with g_unix_mounts_changed_since().
*
* If more mounts have the same mount path, the last matching mount
* is returned.
*
* This will return %NULL if there is no mount point at @mount_path.
*
* Returns: (transfer full) (nullable): a #GUnixMountEntry.
**/
GUnixMountEntry *
g_unix_mount_at (const char *mount_path,
guint64 *time_read)
{
GList *mounts, *l;
GUnixMountEntry *mount_entry, *found;
mounts = g_unix_mounts_get (time_read);
found = NULL;
for (l = mounts; l != NULL; l = l->next)
{
mount_entry = l->data;
if (strcmp (mount_path, mount_entry->mount_path) == 0)
{
if (found != NULL)
g_unix_mount_free (found);
found = mount_entry;
}
else
g_unix_mount_free (mount_entry);
}
g_list_free (mounts);
return found;
}
/**
* g_unix_mount_for:
* @file_path: (type filename): file path on some unix mount.
* @time_read: (out) (optional): guint64 to contain a timestamp.
*
* Gets a #GUnixMountEntry for a given file path. If @time_read
* is set, it will be filled with a unix timestamp for checking
* if the mounts have changed since with g_unix_mounts_changed_since().
*
* If more mounts have the same mount path, the last matching mount
* is returned.
*
* This will return %NULL if looking up the mount entry fails, if
* @file_path doesn’t exist or there is an I/O error.
*
* Returns: (transfer full) (nullable): a #GUnixMountEntry.
*
* Since: 2.52
**/
GUnixMountEntry *
g_unix_mount_for (const char *file_path,
guint64 *time_read)
{
GUnixMountEntry *entry;
g_return_val_if_fail (file_path != NULL, NULL);
entry = g_unix_mount_at (file_path, time_read);
if (entry == NULL)
{
char *topdir;
topdir = _g_local_file_find_topdir_for (file_path);
if (topdir != NULL)
{
entry = g_unix_mount_at (topdir, time_read);
g_free (topdir);
}
}
return entry;
}
static gpointer
copy_mount_point_cb (gconstpointer src,
gpointer data)
{
GUnixMountPoint *src_mount_point = (GUnixMountPoint *) src;
return g_unix_mount_point_copy (src_mount_point);
}
/**
* g_unix_mount_points_get:
* @time_read: (out) (optional): guint64 to contain a timestamp.
*
* Gets a #GList of #GUnixMountPoint containing the unix mount points.
* If @time_read is set, it will be filled with the mount timestamp,
* allowing for checking if the mounts have changed with
* g_unix_mount_points_changed_since().
*
* Returns: (element-type GUnixMountPoint) (transfer full):
* a #GList of the UNIX mountpoints.
**/
GList *
g_unix_mount_points_get (guint64 *time_read)
{
static GList *mnt_pts_last = NULL;
static guint64 time_read_last = 0;
GList *mnt_pts = NULL;
guint64 time_read_now;
G_LOCK_DEFINE_STATIC (unix_mount_points);
G_LOCK (unix_mount_points);
time_read_now = get_mount_points_timestamp ();
if (time_read_now != time_read_last || mnt_pts_last == NULL)
{
time_read_last = time_read_now;
g_list_free_full (mnt_pts_last, (GDestroyNotify) g_unix_mount_point_free);
mnt_pts_last = _g_get_unix_mount_points ();
}
mnt_pts = g_list_copy_deep (mnt_pts_last, copy_mount_point_cb, NULL);
G_UNLOCK (unix_mount_points);
if (time_read)
*time_read = time_read_now;
return mnt_pts;
}
/**
* g_unix_mount_point_at:
* @mount_path: (type filename): path for a possible unix mount point.
* @time_read: (out) (optional): guint64 to contain a timestamp.
*
* Gets a #GUnixMountPoint for a given mount path. If @time_read is set, it
* will be filled with a unix timestamp for checking if the mount points have
* changed since with g_unix_mount_points_changed_since().
*
* If more mount points have the same mount path, the last matching mount point
* is returned.
*
* Returns: (transfer full) (nullable): a #GUnixMountPoint, or %NULL if no match
* is found.
*
* Since: 2.66
**/
GUnixMountPoint *
g_unix_mount_point_at (const char *mount_path,
guint64 *time_read)
{
GList *mount_points, *l;
GUnixMountPoint *mount_point, *found;
mount_points = g_unix_mount_points_get (time_read);
found = NULL;
for (l = mount_points; l != NULL; l = l->next)
{
mount_point = l->data;
if (strcmp (mount_path, mount_point->mount_path) == 0)
{
if (found != NULL)
g_unix_mount_point_free (found);
found = mount_point;
}
else
g_unix_mount_point_free (mount_point);
}
g_list_free (mount_points);
return found;
}
/**
* g_unix_mounts_changed_since:
* @time: guint64 to contain a timestamp.
*
* Checks if the unix mounts have changed since a given unix time.
*
* Returns: %TRUE if the mounts have changed since @time.
**/
gboolean
g_unix_mounts_changed_since (guint64 time)
{
return get_mounts_timestamp () != time;
}
/**
* g_unix_mount_points_changed_since:
* @time: guint64 to contain a timestamp.
*
* Checks if the unix mount points have changed since a given unix time.
*
* Returns: %TRUE if the mount points have changed since @time.
**/
gboolean
g_unix_mount_points_changed_since (guint64 time)
{
return get_mount_points_timestamp () != time;
}
/* GUnixMountMonitor {{{1 */
enum {
MOUNTS_CHANGED,
MOUNTPOINTS_CHANGED,
LAST_SIGNAL
};
static guint signals[LAST_SIGNAL];
struct _GUnixMountMonitor {
GObject parent;
GMainContext *context;
};
struct _GUnixMountMonitorClass {
GObjectClass parent_class;
};
G_DEFINE_TYPE (GUnixMountMonitor, g_unix_mount_monitor, G_TYPE_OBJECT)
static GContextSpecificGroup mount_monitor_group;
static GFileMonitor *fstab_monitor;
static GFileMonitor *mtab_monitor;
static GList *mount_poller_mounts;
static guint mtab_file_changed_id;
/* Called with proc_mounts_source lock held. */
static gboolean
proc_mounts_watch_is_running (void)
{
return proc_mounts_watch_source != NULL &&
!g_source_is_destroyed (proc_mounts_watch_source);
}
static void
fstab_file_changed (GFileMonitor *monitor,
GFile *file,
GFile *other_file,
GFileMonitorEvent event_type,
gpointer user_data)
{
if (event_type != G_FILE_MONITOR_EVENT_CHANGED &&
event_type != G_FILE_MONITOR_EVENT_CREATED &&
event_type != G_FILE_MONITOR_EVENT_DELETED)
return;
g_context_specific_group_emit (&mount_monitor_group, signals[MOUNTPOINTS_CHANGED]);
}
static gboolean
mtab_file_changed_cb (gpointer user_data)
{
mtab_file_changed_id = 0;
g_context_specific_group_emit (&mount_monitor_group, signals[MOUNTS_CHANGED]);
return G_SOURCE_REMOVE;
}
static void
mtab_file_changed (GFileMonitor *monitor,
GFile *file,
GFile *other_file,
GFileMonitorEvent event_type,
gpointer user_data)
{
GMainContext *context;
GSource *source;
if (event_type != G_FILE_MONITOR_EVENT_CHANGED &&
event_type != G_FILE_MONITOR_EVENT_CREATED &&
event_type != G_FILE_MONITOR_EVENT_DELETED)
return;
/* Skip accumulated events from file monitor which we are not able to handle
* in a real time instead of emitting mounts_changed signal several times.
* This should behave equally to GIOChannel based monitoring. See Bug 792235.
*/
if (mtab_file_changed_id > 0)
return;
context = g_main_context_get_thread_default ();
if (!context)
context = g_main_context_default ();
source = g_idle_source_new ();
g_source_set_priority (source, G_PRIORITY_DEFAULT);
g_source_set_callback (source, mtab_file_changed_cb, NULL, NULL);
g_source_set_static_name (source, "[gio] mtab_file_changed_cb");
g_source_attach (source, context);
g_source_unref (source);
}
static gboolean
proc_mounts_changed (GIOChannel *channel,
GIOCondition cond,
gpointer user_data)
{
gboolean has_changed = FALSE;
#ifdef HAVE_LIBMOUNT
if (cond & G_IO_IN)
{
G_LOCK (proc_mounts_source);
if (proc_mounts_monitor != NULL)
{
int ret;
/* The mnt_monitor_next_change function needs to be used to avoid false-positives. */
ret = mnt_monitor_next_change (proc_mounts_monitor, NULL, NULL);
if (ret == 0)
{
has_changed = TRUE;
ret = mnt_monitor_event_cleanup (proc_mounts_monitor);
}
if (ret < 0)
g_debug ("mnt_monitor_next_change failed: %s", g_strerror (-ret));
}
G_UNLOCK (proc_mounts_source);
}
#endif
if (cond & G_IO_ERR)
has_changed = TRUE;
if (has_changed)
{
G_LOCK (proc_mounts_source);
mount_poller_time = (guint64) g_get_monotonic_time ();
G_UNLOCK (proc_mounts_source);
g_context_specific_group_emit (&mount_monitor_group, signals[MOUNTS_CHANGED]);
}
return TRUE;
}
static gboolean
mount_change_poller (gpointer user_data)
{
GList *current_mounts, *new_it, *old_it;
gboolean has_changed = FALSE;
current_mounts = _g_get_unix_mounts ();
for ( new_it = current_mounts, old_it = mount_poller_mounts;
new_it != NULL && old_it != NULL;
new_it = g_list_next (new_it), old_it = g_list_next (old_it) )
{
if (g_unix_mount_compare (new_it->data, old_it->data) != 0)
{
has_changed = TRUE;
break;
}
}
if (!(new_it == NULL && old_it == NULL))
has_changed = TRUE;
g_list_free_full (mount_poller_mounts, (GDestroyNotify) g_unix_mount_free);
mount_poller_mounts = current_mounts;
if (has_changed)
{
G_LOCK (proc_mounts_source);
mount_poller_time = (guint64) g_get_monotonic_time ();
G_UNLOCK (proc_mounts_source);
g_context_specific_group_emit (&mount_monitor_group, signals[MOUNTPOINTS_CHANGED]);
}
return TRUE;
}
static void
mount_monitor_stop (void)
{
if (fstab_monitor)
{
g_file_monitor_cancel (fstab_monitor);
g_object_unref (fstab_monitor);
}
G_LOCK (proc_mounts_source);
if (proc_mounts_watch_source != NULL)
{
g_source_destroy (proc_mounts_watch_source);
proc_mounts_watch_source = NULL;
}
#ifdef HAVE_LIBMOUNT
g_clear_pointer (&proc_mounts_monitor, mnt_unref_monitor);
#endif
G_UNLOCK (proc_mounts_source);
if (mtab_monitor)
{
g_file_monitor_cancel (mtab_monitor);
g_object_unref (mtab_monitor);
}
if (mtab_file_changed_id)
{
g_source_remove (mtab_file_changed_id);
mtab_file_changed_id = 0;
}
g_list_free_full (mount_poller_mounts, (GDestroyNotify) g_unix_mount_free);
}
static void
mount_monitor_start (void)
{
GFile *file;
if (get_fstab_file () != NULL)
{
file = g_file_new_for_path (get_fstab_file ());
fstab_monitor = g_file_monitor_file (file, 0, NULL, NULL);
g_object_unref (file);
g_signal_connect (fstab_monitor, "changed", (GCallback)fstab_file_changed, NULL);
}
if (get_mtab_monitor_file () != NULL)
{
const gchar *mtab_path;
mtab_path = get_mtab_monitor_file ();
/* Monitoring files in /proc/ is special - can't just use GFileMonitor.
* See 'man proc' for more details.
*/
if (g_str_has_prefix (mtab_path, "/proc/"))
{
GIOChannel *proc_mounts_channel = NULL;
GError *error = NULL;
#ifdef HAVE_LIBMOUNT
int ret;
G_LOCK (proc_mounts_source);
proc_mounts_monitor = mnt_new_monitor ();
ret = mnt_monitor_enable_kernel (proc_mounts_monitor, TRUE);
if (ret < 0)
g_warning ("mnt_monitor_enable_kernel failed: %s", g_strerror (-ret));
ret = mnt_monitor_enable_userspace (proc_mounts_monitor, TRUE, NULL);
if (ret < 0)
g_warning ("mnt_monitor_enable_userspace failed: %s", g_strerror (-ret));
#ifdef HAVE_MNT_MONITOR_VEIL_KERNEL
ret = mnt_monitor_veil_kernel (proc_mounts_monitor, TRUE);
if (ret < 0)
g_warning ("mnt_monitor_veil_kernel failed: %s", g_strerror (-ret));
#endif
ret = mnt_monitor_get_fd (proc_mounts_monitor);
if (ret >= 0)
{
proc_mounts_channel = g_io_channel_unix_new (ret);
}
else
{
g_debug ("mnt_monitor_get_fd failed: %s", g_strerror (-ret));
g_clear_pointer (&proc_mounts_monitor, mnt_unref_monitor);
/* The mnt_monitor_get_fd function failed e.g. inotify limits are
* exceeded. Let's try to silently fallback to the old behavior.
* See: https://gitlab.gnome.org/GNOME/tracker-miners/-/issues/315
*/
}
G_UNLOCK (proc_mounts_source);
#endif
if (proc_mounts_channel == NULL)
proc_mounts_channel = g_io_channel_new_file (mtab_path, "r", &error);
if (error != NULL)
{
g_warning ("Error creating IO channel for %s: %s (%s, %d)", mtab_path,
error->message, g_quark_to_string (error->domain), error->code);
g_error_free (error);
}
else
{
G_LOCK (proc_mounts_source);
#ifdef HAVE_LIBMOUNT
if (proc_mounts_monitor != NULL)
proc_mounts_watch_source = g_io_create_watch (proc_mounts_channel, G_IO_IN);
#endif
if (proc_mounts_watch_source == NULL)
proc_mounts_watch_source = g_io_create_watch (proc_mounts_channel, G_IO_ERR);
mount_poller_time = (guint64) g_get_monotonic_time ();
g_source_set_callback (proc_mounts_watch_source,
(GSourceFunc) proc_mounts_changed,
NULL, NULL);
g_source_attach (proc_mounts_watch_source,
g_main_context_get_thread_default ());
g_source_unref (proc_mounts_watch_source);
g_io_channel_unref (proc_mounts_channel);
G_UNLOCK (proc_mounts_source);
}
}
else
{
file = g_file_new_for_path (mtab_path);
mtab_monitor = g_file_monitor_file (file, 0, NULL, NULL);
g_object_unref (file);
g_signal_connect (mtab_monitor, "changed", (GCallback)mtab_file_changed, NULL);
}
}
else
{
G_LOCK (proc_mounts_source);
proc_mounts_watch_source = g_timeout_source_new_seconds (3);
mount_poller_mounts = _g_get_unix_mounts ();
mount_poller_time = (guint64)g_get_monotonic_time ();
g_source_set_callback (proc_mounts_watch_source,
mount_change_poller,
NULL, NULL);
g_source_attach (proc_mounts_watch_source,
g_main_context_get_thread_default ());
g_source_unref (proc_mounts_watch_source);
G_UNLOCK (proc_mounts_source);
}
}
static void
g_unix_mount_monitor_finalize (GObject *object)
{
GUnixMountMonitor *monitor;
monitor = G_UNIX_MOUNT_MONITOR (object);
g_context_specific_group_remove (&mount_monitor_group, monitor->context, monitor, mount_monitor_stop);
G_OBJECT_CLASS (g_unix_mount_monitor_parent_class)->finalize (object);
}
static void
g_unix_mount_monitor_class_init (GUnixMountMonitorClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->finalize = g_unix_mount_monitor_finalize;
/**
* GUnixMountMonitor::mounts-changed:
* @monitor: the object on which the signal is emitted
*
* Emitted when the unix mounts have changed.
*/
signals[MOUNTS_CHANGED] =
g_signal_new (I_("mounts-changed"),
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
0,
NULL, NULL,
NULL,
G_TYPE_NONE, 0);
/**
* GUnixMountMonitor::mountpoints-changed:
* @monitor: the object on which the signal is emitted
*
* Emitted when the unix mount points have changed.
*/
signals[MOUNTPOINTS_CHANGED] =
g_signal_new (I_("mountpoints-changed"),
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
0,
NULL, NULL,
NULL,
G_TYPE_NONE, 0);
}
static void
g_unix_mount_monitor_init (GUnixMountMonitor *monitor)
{
}
/**
* g_unix_mount_monitor_set_rate_limit:
* @mount_monitor: a #GUnixMountMonitor
* @limit_msec: a integer with the limit in milliseconds to
* poll for changes.
*
* This function does nothing.
*
* Before 2.44, this was a partially-effective way of controlling the
* rate at which events would be reported under some uncommon
* circumstances. Since @mount_monitor is a singleton, it also meant
* that calling this function would have side effects for other users of
* the monitor.
*
* Since: 2.18
*
* Deprecated:2.44:This function does nothing. Don't call it.
*/
void
g_unix_mount_monitor_set_rate_limit (GUnixMountMonitor *mount_monitor,
gint limit_msec)
{
}
/**
* g_unix_mount_monitor_get:
*
* Gets the #GUnixMountMonitor for the current thread-default main
* context.
*
* The mount monitor can be used to monitor for changes to the list of
* mounted filesystems as well as the list of mount points (ie: fstab
* entries).
*
* You must only call g_object_unref() on the return value from under
* the same main context as you called this function.
*
* Returns: (transfer full): the #GUnixMountMonitor.
*
* Since: 2.44
**/
GUnixMountMonitor *
g_unix_mount_monitor_get (void)
{
return g_context_specific_group_get (&mount_monitor_group,
G_TYPE_UNIX_MOUNT_MONITOR,
G_STRUCT_OFFSET(GUnixMountMonitor, context),
mount_monitor_start);
}
/**
* g_unix_mount_monitor_new:
*
* Deprecated alias for g_unix_mount_monitor_get().
*
* This function was never a true constructor, which is why it was
* renamed.
*
* Returns: a #GUnixMountMonitor.
*
* Deprecated:2.44:Use g_unix_mount_monitor_get() instead.
*/
GUnixMountMonitor *
g_unix_mount_monitor_new (void)
{
return g_unix_mount_monitor_get ();
}
/* GUnixMount {{{1 */
/**
* g_unix_mount_free:
* @mount_entry: a #GUnixMountEntry.
*
* Frees a unix mount.
*/
void
g_unix_mount_free (GUnixMountEntry *mount_entry)
{
g_return_if_fail (mount_entry != NULL);
g_free (mount_entry->mount_path);
g_free (mount_entry->device_path);
g_free (mount_entry->root_path);
g_free (mount_entry->filesystem_type);
g_free (mount_entry->options);
g_free (mount_entry);
}
/**
* g_unix_mount_copy:
* @mount_entry: a #GUnixMountEntry.
*
* Makes a copy of @mount_entry.
*
* Returns: (transfer full): a new #GUnixMountEntry
*
* Since: 2.54
*/
GUnixMountEntry *
g_unix_mount_copy (GUnixMountEntry *mount_entry)
{
GUnixMountEntry *copy;
g_return_val_if_fail (mount_entry != NULL, NULL);
copy = g_new0 (GUnixMountEntry, 1);
copy->mount_path = g_strdup (mount_entry->mount_path);
copy->device_path = g_strdup (mount_entry->device_path);
copy->root_path = g_strdup (mount_entry->root_path);
copy->filesystem_type = g_strdup (mount_entry->filesystem_type);
copy->options = g_strdup (mount_entry->options);
copy->is_read_only = mount_entry->is_read_only;
copy->is_system_internal = mount_entry->is_system_internal;
return copy;
}
/**
* g_unix_mount_point_free:
* @mount_point: unix mount point to free.
*
* Frees a unix mount point.
*/
void
g_unix_mount_point_free (GUnixMountPoint *mount_point)
{
g_return_if_fail (mount_point != NULL);
g_free (mount_point->mount_path);
g_free (mount_point->device_path);
g_free (mount_point->filesystem_type);
g_free (mount_point->options);
g_free (mount_point);
}
/**
* g_unix_mount_point_copy:
* @mount_point: a #GUnixMountPoint.
*
* Makes a copy of @mount_point.
*
* Returns: (transfer full): a new #GUnixMountPoint
*
* Since: 2.54
*/
GUnixMountPoint*
g_unix_mount_point_copy (GUnixMountPoint *mount_point)
{
GUnixMountPoint *copy;
g_return_val_if_fail (mount_point != NULL, NULL);
copy = g_new0 (GUnixMountPoint, 1);
copy->mount_path = g_strdup (mount_point->mount_path);
copy->device_path = g_strdup (mount_point->device_path);
copy->filesystem_type = g_strdup (mount_point->filesystem_type);
copy->options = g_strdup (mount_point->options);
copy->is_read_only = mount_point->is_read_only;
copy->is_user_mountable = mount_point->is_user_mountable;
copy->is_loopback = mount_point->is_loopback;
return copy;
}
/**
* g_unix_mount_compare:
* @mount1: first #GUnixMountEntry to compare.
* @mount2: second #GUnixMountEntry to compare.
*
* Compares two unix mounts.
*
* Returns: 1, 0 or -1 if @mount1 is greater than, equal to,
* or less than @mount2, respectively.
*/
gint
g_unix_mount_compare (GUnixMountEntry *mount1,
GUnixMountEntry *mount2)
{
int res;
g_return_val_if_fail (mount1 != NULL && mount2 != NULL, 0);
res = g_strcmp0 (mount1->mount_path, mount2->mount_path);
if (res != 0)
return res;
res = g_strcmp0 (mount1->device_path, mount2->device_path);
if (res != 0)
return res;
res = g_strcmp0 (mount1->root_path, mount2->root_path);
if (res != 0)
return res;
res = g_strcmp0 (mount1->filesystem_type, mount2->filesystem_type);
if (res != 0)
return res;
res = g_strcmp0 (mount1->options, mount2->options);
if (res != 0)
return res;
res = mount1->is_read_only - mount2->is_read_only;
if (res != 0)
return res;
return 0;
}
/**
* g_unix_mount_get_mount_path:
* @mount_entry: input #GUnixMountEntry to get the mount path for.
*
* Gets the mount path for a unix mount.
*
* Returns: (type filename): the mount path for @mount_entry.
*/
const gchar *
g_unix_mount_get_mount_path (GUnixMountEntry *mount_entry)
{
g_return_val_if_fail (mount_entry != NULL, NULL);
return mount_entry->mount_path;
}
/**
* g_unix_mount_get_device_path:
* @mount_entry: a #GUnixMount.
*
* Gets the device path for a unix mount.
*
* Returns: (type filename): a string containing the device path.
*/
const gchar *
g_unix_mount_get_device_path (GUnixMountEntry *mount_entry)
{
g_return_val_if_fail (mount_entry != NULL, NULL);
return mount_entry->device_path;
}
/**
* g_unix_mount_get_root_path:
* @mount_entry: a #GUnixMountEntry.
*
* Gets the root of the mount within the filesystem. This is useful e.g. for
* mounts created by bind operation, or btrfs subvolumes.
*
* For example, the root path is equal to "/" for mount created by
* "mount /dev/sda1 /mnt/foo" and "/bar" for
* "mount --bind /mnt/foo/bar /mnt/bar".
*
* Returns: (nullable): a string containing the root, or %NULL if not supported.
*
* Since: 2.60
*/
const gchar *
g_unix_mount_get_root_path (GUnixMountEntry *mount_entry)
{
g_return_val_if_fail (mount_entry != NULL, NULL);
return mount_entry->root_path;
}
/**
* g_unix_mount_get_fs_type:
* @mount_entry: a #GUnixMount.
*
* Gets the filesystem type for the unix mount.
*
* Returns: a string containing the file system type.
*/
const gchar *
g_unix_mount_get_fs_type (GUnixMountEntry *mount_entry)
{
g_return_val_if_fail (mount_entry != NULL, NULL);
return mount_entry->filesystem_type;
}
/**
* g_unix_mount_get_options:
* @mount_entry: a #GUnixMountEntry.
*
* Gets a comma-separated list of mount options for the unix mount. For example,
* `rw,relatime,seclabel,data=ordered`.
*
* This is similar to g_unix_mount_point_get_options(), but it takes
* a #GUnixMountEntry as an argument.
*
* Returns: (nullable): a string containing the options, or %NULL if not
* available.
*
* Since: 2.58
*/
const gchar *
g_unix_mount_get_options (GUnixMountEntry *mount_entry)
{
g_return_val_if_fail (mount_entry != NULL, NULL);
return mount_entry->options;
}
/**
* g_unix_mount_is_readonly:
* @mount_entry: a #GUnixMount.
*
* Checks if a unix mount is mounted read only.
*
* Returns: %TRUE if @mount_entry is read only.
*/
gboolean
g_unix_mount_is_readonly (GUnixMountEntry *mount_entry)
{
g_return_val_if_fail (mount_entry != NULL, FALSE);
return mount_entry->is_read_only;
}
/**
* g_unix_mount_is_system_internal:
* @mount_entry: a #GUnixMount.
*
* Checks if a Unix mount is a system mount. This is the Boolean OR of
* g_unix_is_system_fs_type(), g_unix_is_system_device_path() and
* g_unix_is_mount_path_system_internal() on @mount_entry’s properties.
*
* The definition of what a ‘system’ mount entry is may change over time as new
* file system types and device paths are ignored.
*
* Returns: %TRUE if the unix mount is for a system path.
*/
gboolean
g_unix_mount_is_system_internal (GUnixMountEntry *mount_entry)
{
g_return_val_if_fail (mount_entry != NULL, FALSE);
return mount_entry->is_system_internal;
}
/* GUnixMountPoint {{{1 */
/**
* g_unix_mount_point_compare:
* @mount1: a #GUnixMount.
* @mount2: a #GUnixMount.
*
* Compares two unix mount points.
*
* Returns: 1, 0 or -1 if @mount1 is greater than, equal to,
* or less than @mount2, respectively.
*/
gint
g_unix_mount_point_compare (GUnixMountPoint *mount1,
GUnixMountPoint *mount2)
{
int res;
g_return_val_if_fail (mount1 != NULL && mount2 != NULL, 0);
res = g_strcmp0 (mount1->mount_path, mount2->mount_path);
if (res != 0)
return res;
res = g_strcmp0 (mount1->device_path, mount2->device_path);
if (res != 0)
return res;
res = g_strcmp0 (mount1->filesystem_type, mount2->filesystem_type);
if (res != 0)
return res;
res = g_strcmp0 (mount1->options, mount2->options);
if (res != 0)
return res;
res = mount1->is_read_only - mount2->is_read_only;
if (res != 0)
return res;
res = mount1->is_user_mountable - mount2->is_user_mountable;
if (res != 0)
return res;
res = mount1->is_loopback - mount2->is_loopback;
if (res != 0)
return res;
return 0;
}
/**
* g_unix_mount_point_get_mount_path:
* @mount_point: a #GUnixMountPoint.
*
* Gets the mount path for a unix mount point.
*
* Returns: (type filename): a string containing the mount path.
*/
const gchar *
g_unix_mount_point_get_mount_path (GUnixMountPoint *mount_point)
{
g_return_val_if_fail (mount_point != NULL, NULL);
return mount_point->mount_path;
}
/**
* g_unix_mount_point_get_device_path:
* @mount_point: a #GUnixMountPoint.
*
* Gets the device path for a unix mount point.
*
* Returns: (type filename): a string containing the device path.
*/
const gchar *
g_unix_mount_point_get_device_path (GUnixMountPoint *mount_point)
{
g_return_val_if_fail (mount_point != NULL, NULL);
return mount_point->device_path;
}
/**
* g_unix_mount_point_get_fs_type:
* @mount_point: a #GUnixMountPoint.
*
* Gets the file system type for the mount point.
*
* Returns: a string containing the file system type.
*/
const gchar *
g_unix_mount_point_get_fs_type (GUnixMountPoint *mount_point)
{
g_return_val_if_fail (mount_point != NULL, NULL);
return mount_point->filesystem_type;
}
/**
* g_unix_mount_point_get_options:
* @mount_point: a #GUnixMountPoint.
*
* Gets the options for the mount point.
*
* Returns: (nullable): a string containing the options.
*
* Since: 2.32
*/
const gchar *
g_unix_mount_point_get_options (GUnixMountPoint *mount_point)
{
g_return_val_if_fail (mount_point != NULL, NULL);
return mount_point->options;
}
/**
* g_unix_mount_point_is_readonly:
* @mount_point: a #GUnixMountPoint.
*
* Checks if a unix mount point is read only.
*
* Returns: %TRUE if a mount point is read only.
*/
gboolean
g_unix_mount_point_is_readonly (GUnixMountPoint *mount_point)
{
g_return_val_if_fail (mount_point != NULL, FALSE);
return mount_point->is_read_only;
}
/**
* g_unix_mount_point_is_user_mountable:
* @mount_point: a #GUnixMountPoint.
*
* Checks if a unix mount point is mountable by the user.
*
* Returns: %TRUE if the mount point is user mountable.
*/
gboolean
g_unix_mount_point_is_user_mountable (GUnixMountPoint *mount_point)
{
g_return_val_if_fail (mount_point != NULL, FALSE);
return mount_point->is_user_mountable;
}
/**
* g_unix_mount_point_is_loopback:
* @mount_point: a #GUnixMountPoint.
*
* Checks if a unix mount point is a loopback device.
*
* Returns: %TRUE if the mount point is a loopback. %FALSE otherwise.
*/
gboolean
g_unix_mount_point_is_loopback (GUnixMountPoint *mount_point)
{
g_return_val_if_fail (mount_point != NULL, FALSE);
return mount_point->is_loopback;
}
static GUnixMountType
guess_mount_type (const char *mount_path,
const char *device_path,
const char *filesystem_type)
{
GUnixMountType type;
char *basename;
type = G_UNIX_MOUNT_TYPE_UNKNOWN;
if ((strcmp (filesystem_type, "udf") == 0) ||
(strcmp (filesystem_type, "iso9660") == 0) ||
(strcmp (filesystem_type, "cd9660") == 0))
type = G_UNIX_MOUNT_TYPE_CDROM;
else if ((strcmp (filesystem_type, "nfs") == 0) ||
(strcmp (filesystem_type, "nfs4") == 0))
type = G_UNIX_MOUNT_TYPE_NFS;
else if (g_str_has_prefix (device_path, "/vol/dev/diskette/") ||
g_str_has_prefix (device_path, "/dev/fd") ||
g_str_has_prefix (device_path, "/dev/floppy"))
type = G_UNIX_MOUNT_TYPE_FLOPPY;
else if (g_str_has_prefix (device_path, "/dev/cdrom") ||
g_str_has_prefix (device_path, "/dev/acd") ||
g_str_has_prefix (device_path, "/dev/cd"))
type = G_UNIX_MOUNT_TYPE_CDROM;
else if (g_str_has_prefix (device_path, "/vol/"))
{
const char *name = mount_path + strlen ("/");
if (g_str_has_prefix (name, "cdrom"))
type = G_UNIX_MOUNT_TYPE_CDROM;
else if (g_str_has_prefix (name, "floppy") ||
g_str_has_prefix (device_path, "/vol/dev/diskette/"))
type = G_UNIX_MOUNT_TYPE_FLOPPY;
else if (g_str_has_prefix (name, "rmdisk"))
type = G_UNIX_MOUNT_TYPE_ZIP;
else if (g_str_has_prefix (name, "jaz"))
type = G_UNIX_MOUNT_TYPE_JAZ;
else if (g_str_has_prefix (name, "memstick"))
type = G_UNIX_MOUNT_TYPE_MEMSTICK;
}
else
{
basename = g_path_get_basename (mount_path);
if (g_str_has_prefix (basename, "cdr") ||
g_str_has_prefix (basename, "cdwriter") ||
g_str_has_prefix (basename, "burn") ||
g_str_has_prefix (basename, "dvdr"))
type = G_UNIX_MOUNT_TYPE_CDROM;
else if (g_str_has_prefix (basename, "floppy"))
type = G_UNIX_MOUNT_TYPE_FLOPPY;
else if (g_str_has_prefix (basename, "zip"))
type = G_UNIX_MOUNT_TYPE_ZIP;
else if (g_str_has_prefix (basename, "jaz"))
type = G_UNIX_MOUNT_TYPE_JAZ;
else if (g_str_has_prefix (basename, "camera"))
type = G_UNIX_MOUNT_TYPE_CAMERA;
else if (g_str_has_prefix (basename, "memstick") ||
g_str_has_prefix (basename, "memory_stick") ||
g_str_has_prefix (basename, "ram"))
type = G_UNIX_MOUNT_TYPE_MEMSTICK;
else if (g_str_has_prefix (basename, "compact_flash"))
type = G_UNIX_MOUNT_TYPE_CF;
else if (g_str_has_prefix (basename, "smart_media"))
type = G_UNIX_MOUNT_TYPE_SM;
else if (g_str_has_prefix (basename, "sd_mmc"))
type = G_UNIX_MOUNT_TYPE_SDMMC;
else if (g_str_has_prefix (basename, "ipod"))
type = G_UNIX_MOUNT_TYPE_IPOD;
g_free (basename);
}
if (type == G_UNIX_MOUNT_TYPE_UNKNOWN)
type = G_UNIX_MOUNT_TYPE_HD;
return type;
}
/**
* g_unix_mount_guess_type:
* @mount_entry: a #GUnixMount.
*
* Guesses the type of a unix mount. If the mount type cannot be
* determined, returns %G_UNIX_MOUNT_TYPE_UNKNOWN.
*
* Returns: a #GUnixMountType.
*/
static GUnixMountType
g_unix_mount_guess_type (GUnixMountEntry *mount_entry)
{
g_return_val_if_fail (mount_entry != NULL, G_UNIX_MOUNT_TYPE_UNKNOWN);
g_return_val_if_fail (mount_entry->mount_path != NULL, G_UNIX_MOUNT_TYPE_UNKNOWN);
g_return_val_if_fail (mount_entry->device_path != NULL, G_UNIX_MOUNT_TYPE_UNKNOWN);
g_return_val_if_fail (mount_entry->filesystem_type != NULL, G_UNIX_MOUNT_TYPE_UNKNOWN);
return guess_mount_type (mount_entry->mount_path,
mount_entry->device_path,
mount_entry->filesystem_type);
}
/**
* g_unix_mount_point_guess_type:
* @mount_point: a #GUnixMountPoint.
*
* Guesses the type of a unix mount point.
* If the mount type cannot be determined,
* returns %G_UNIX_MOUNT_TYPE_UNKNOWN.
*
* Returns: a #GUnixMountType.
*/
static GUnixMountType
g_unix_mount_point_guess_type (GUnixMountPoint *mount_point)
{
g_return_val_if_fail (mount_point != NULL, G_UNIX_MOUNT_TYPE_UNKNOWN);
g_return_val_if_fail (mount_point->mount_path != NULL, G_UNIX_MOUNT_TYPE_UNKNOWN);
g_return_val_if_fail (mount_point->device_path != NULL, G_UNIX_MOUNT_TYPE_UNKNOWN);
g_return_val_if_fail (mount_point->filesystem_type != NULL, G_UNIX_MOUNT_TYPE_UNKNOWN);
return guess_mount_type (mount_point->mount_path,
mount_point->device_path,
mount_point->filesystem_type);
}
static const char *
type_to_icon (GUnixMountType type, gboolean is_mount_point, gboolean use_symbolic)
{
const char *icon_name;
switch (type)
{
case G_UNIX_MOUNT_TYPE_HD:
if (is_mount_point)
icon_name = use_symbolic ? "drive-removable-media-symbolic" : "drive-removable-media";
else
icon_name = use_symbolic ? "drive-harddisk-symbolic" : "drive-harddisk";
break;
case G_UNIX_MOUNT_TYPE_FLOPPY:
case G_UNIX_MOUNT_TYPE_ZIP:
case G_UNIX_MOUNT_TYPE_JAZ:
if (is_mount_point)
icon_name = use_symbolic ? "drive-removable-media-symbolic" : "drive-removable-media";
else
icon_name = use_symbolic ? "media-removable-symbolic" : "media-floppy";
break;
case G_UNIX_MOUNT_TYPE_CDROM:
if (is_mount_point)
icon_name = use_symbolic ? "drive-optical-symbolic" : "drive-optical";
else
icon_name = use_symbolic ? "media-optical-symbolic" : "media-optical";
break;
case G_UNIX_MOUNT_TYPE_NFS:
icon_name = use_symbolic ? "folder-remote-symbolic" : "folder-remote";
break;
case G_UNIX_MOUNT_TYPE_MEMSTICK:
if (is_mount_point)
icon_name = use_symbolic ? "drive-removable-media-symbolic" : "drive-removable-media";
else
icon_name = use_symbolic ? "media-removable-symbolic" : "media-flash";
break;
case G_UNIX_MOUNT_TYPE_CAMERA:
if (is_mount_point)
icon_name = use_symbolic ? "drive-removable-media-symbolic" : "drive-removable-media";
else
icon_name = use_symbolic ? "camera-photo-symbolic" : "camera-photo";
break;
case G_UNIX_MOUNT_TYPE_IPOD:
if (is_mount_point)
icon_name = use_symbolic ? "drive-removable-media-symbolic" : "drive-removable-media";
else
icon_name = use_symbolic ? "multimedia-player-symbolic" : "multimedia-player";
break;
case G_UNIX_MOUNT_TYPE_UNKNOWN:
default:
if (is_mount_point)
icon_name = use_symbolic ? "drive-removable-media-symbolic" : "drive-removable-media";
else
icon_name = use_symbolic ? "drive-harddisk-symbolic" : "drive-harddisk";
break;
}
return icon_name;
}
/**
* g_unix_mount_guess_name:
* @mount_entry: a #GUnixMountEntry
*
* Guesses the name of a Unix mount.
* The result is a translated string.
*
* Returns: A newly allocated string that must
* be freed with g_free()
*/
gchar *
g_unix_mount_guess_name (GUnixMountEntry *mount_entry)
{
char *name;
if (strcmp (mount_entry->mount_path, "/") == 0)
name = g_strdup (_("Filesystem root"));
else
name = g_filename_display_basename (mount_entry->mount_path);
return name;
}
/**
* g_unix_mount_guess_icon:
* @mount_entry: a #GUnixMountEntry
*
* Guesses the icon of a Unix mount.
*
* Returns: (transfer full): a #GIcon
*/
GIcon *
g_unix_mount_guess_icon (GUnixMountEntry *mount_entry)
{
return g_themed_icon_new_with_default_fallbacks (type_to_icon (g_unix_mount_guess_type (mount_entry), FALSE, FALSE));
}
/**
* g_unix_mount_guess_symbolic_icon:
* @mount_entry: a #GUnixMountEntry
*
* Guesses the symbolic icon of a Unix mount.
*
* Returns: (transfer full): a #GIcon
*
* Since: 2.34
*/
GIcon *
g_unix_mount_guess_symbolic_icon (GUnixMountEntry *mount_entry)
{
return g_themed_icon_new_with_default_fallbacks (type_to_icon (g_unix_mount_guess_type (mount_entry), FALSE, TRUE));
}
/**
* g_unix_mount_point_guess_name:
* @mount_point: a #GUnixMountPoint
*
* Guesses the name of a Unix mount point.
* The result is a translated string.
*
* Returns: A newly allocated string that must
* be freed with g_free()
*/
gchar *
g_unix_mount_point_guess_name (GUnixMountPoint *mount_point)
{
char *name;
if (strcmp (mount_point->mount_path, "/") == 0)
name = g_strdup (_("Filesystem root"));
else
name = g_filename_display_basename (mount_point->mount_path);
return name;
}
/**
* g_unix_mount_point_guess_icon:
* @mount_point: a #GUnixMountPoint
*
* Guesses the icon of a Unix mount point.
*
* Returns: (transfer full): a #GIcon
*/
GIcon *
g_unix_mount_point_guess_icon (GUnixMountPoint *mount_point)
{
return g_themed_icon_new_with_default_fallbacks (type_to_icon (g_unix_mount_point_guess_type (mount_point), TRUE, FALSE));
}
/**
* g_unix_mount_point_guess_symbolic_icon:
* @mount_point: a #GUnixMountPoint
*
* Guesses the symbolic icon of a Unix mount point.
*
* Returns: (transfer full): a #GIcon
*
* Since: 2.34
*/
GIcon *
g_unix_mount_point_guess_symbolic_icon (GUnixMountPoint *mount_point)
{
return g_themed_icon_new_with_default_fallbacks (type_to_icon (g_unix_mount_point_guess_type (mount_point), TRUE, TRUE));
}
/**
* g_unix_mount_guess_can_eject:
* @mount_entry: a #GUnixMountEntry
*
* Guesses whether a Unix mount can be ejected.
*
* Returns: %TRUE if @mount_entry is deemed to be ejectable.
*/
gboolean
g_unix_mount_guess_can_eject (GUnixMountEntry *mount_entry)
{
GUnixMountType guessed_type;
guessed_type = g_unix_mount_guess_type (mount_entry);
if (guessed_type == G_UNIX_MOUNT_TYPE_IPOD ||
guessed_type == G_UNIX_MOUNT_TYPE_CDROM)
return TRUE;
return FALSE;
}
/**
* g_unix_mount_guess_should_display:
* @mount_entry: a #GUnixMountEntry
*
* Guesses whether a Unix mount should be displayed in the UI.
*
* Returns: %TRUE if @mount_entry is deemed to be displayable.
*/
gboolean
g_unix_mount_guess_should_display (GUnixMountEntry *mount_entry)
{
const char *mount_path;
const gchar *user_name;
gsize user_name_len;
/* Never display internal mountpoints */
if (g_unix_mount_is_system_internal (mount_entry))
return FALSE;
/* Only display things in /media (which are generally user mountable)
and home dir (fuse stuff) and /run/media/$USER */
mount_path = mount_entry->mount_path;
if (mount_path != NULL)
{
const gboolean running_as_root = (getuid () == 0);
gboolean is_in_runtime_dir = FALSE;
/* Hide mounts within a dot path, suppose it was a purpose to hide this mount */
if (g_strstr_len (mount_path, -1, "/.") != NULL)
return FALSE;
/* Check /run/media/$USER/. If running as root, display any mounts below
* /run/media/. */
if (running_as_root)
{
if (strncmp (mount_path, "/run/media/", strlen ("/run/media/")) == 0)
is_in_runtime_dir = TRUE;
}
else
{
user_name = g_get_user_name ();
user_name_len = strlen (user_name);
if (strncmp (mount_path, "/run/media/", strlen ("/run/media/")) == 0 &&
strncmp (mount_path + strlen ("/run/media/"), user_name, user_name_len) == 0 &&
mount_path[strlen ("/run/media/") + user_name_len] == '/')
is_in_runtime_dir = TRUE;
}
if (is_in_runtime_dir || g_str_has_prefix (mount_path, "/media/"))
{
char *path;
/* Avoid displaying mounts that are not accessible to the user.
*
* See http://bugzilla.gnome.org/show_bug.cgi?id=526320 for why we
* want to avoid g_access() for mount points which can potentially
* block or fail stat()'ing, such as network mounts.
*/
path = g_path_get_dirname (mount_path);
if (g_str_has_prefix (path, "/media/"))
{
if (g_access (path, R_OK|X_OK) != 0)
{
g_free (path);
return FALSE;
}
}
g_free (path);
if (mount_entry->device_path && mount_entry->device_path[0] == '/')
{
struct stat st;
if (g_stat (mount_entry->device_path, &st) == 0 &&
S_ISBLK(st.st_mode) &&
g_access (mount_path, R_OK|X_OK) != 0)
return FALSE;
}
return TRUE;
}
if (g_str_has_prefix (mount_path, g_get_home_dir ()) &&
mount_path[strlen (g_get_home_dir())] == G_DIR_SEPARATOR)
return TRUE;
}
return FALSE;
}
/**
* g_unix_mount_point_guess_can_eject:
* @mount_point: a #GUnixMountPoint
*
* Guesses whether a Unix mount point can be ejected.
*
* Returns: %TRUE if @mount_point is deemed to be ejectable.
*/
gboolean
g_unix_mount_point_guess_can_eject (GUnixMountPoint *mount_point)
{
GUnixMountType guessed_type;
guessed_type = g_unix_mount_point_guess_type (mount_point);
if (guessed_type == G_UNIX_MOUNT_TYPE_IPOD ||
guessed_type == G_UNIX_MOUNT_TYPE_CDROM)
return TRUE;
return FALSE;
}
/* Utility functions {{{1 */
#ifdef HAVE_MNTENT_H
/* borrowed from gtk/gtkfilesystemunix.c in GTK on 02/23/2006 */
static void
_canonicalize_filename (gchar *filename)
{
gchar *p, *q;
gboolean last_was_slash = FALSE;
p = filename;
q = filename;
while (*p)
{
if (*p == G_DIR_SEPARATOR)
{
if (!last_was_slash)
*q++ = G_DIR_SEPARATOR;
last_was_slash = TRUE;
}
else
{
if (last_was_slash && *p == '.')
{
if (*(p + 1) == G_DIR_SEPARATOR ||
*(p + 1) == '\0')
{
if (*(p + 1) == '\0')
break;
p += 1;
}
else if (*(p + 1) == '.' &&
(*(p + 2) == G_DIR_SEPARATOR ||
*(p + 2) == '\0'))
{
if (q > filename + 1)
{
q--;
while (q > filename + 1 &&
*(q - 1) != G_DIR_SEPARATOR)
q--;
}
if (*(p + 2) == '\0')
break;
p += 2;
}
else
{
*q++ = *p;
last_was_slash = FALSE;
}
}
else
{
*q++ = *p;
last_was_slash = FALSE;
}
}
p++;
}
if (q > filename + 1 && *(q - 1) == G_DIR_SEPARATOR)
q--;
*q = '\0';
}
static char *
_resolve_symlink (const char *file)
{
GError *error;
char *dir;
char *link;
char *f;
char *f1;
f = g_strdup (file);
while (g_file_test (f, G_FILE_TEST_IS_SYMLINK))
{
link = g_file_read_link (f, &error);
if (link == NULL)
{
g_error_free (error);
g_free (f);
f = NULL;
goto out;
}
dir = g_path_get_dirname (f);
f1 = g_strdup_printf ("%s/%s", dir, link);
g_free (dir);
g_free (link);
g_free (f);
f = f1;
}
out:
if (f != NULL)
_canonicalize_filename (f);
return f;
}
static const char *
_resolve_dev_root (void)
{
static gboolean have_real_dev_root = FALSE;
static char real_dev_root[256];
struct stat statbuf;
/* see if it's cached already */
if (have_real_dev_root)
goto found;
/* otherwise we're going to find it right away.. */
have_real_dev_root = TRUE;
if (stat ("/dev/root", &statbuf) == 0)
{
if (! S_ISLNK (statbuf.st_mode))
{
dev_t root_dev = statbuf.st_dev;
FILE *f;
/* see if device with similar major:minor as /dev/root is mention
* in /etc/mtab (it usually is)
*/
f = fopen ("/etc/mtab", "re");
if (f != NULL)
{
struct mntent *entp;
#ifdef HAVE_GETMNTENT_R
struct mntent ent;
char buf[1024];
while ((entp = getmntent_r (f, &ent, buf, sizeof (buf))) != NULL)
{
#else
G_LOCK (getmntent);
while ((entp = getmntent (f)) != NULL)
{
#endif
if (stat (entp->mnt_fsname, &statbuf) == 0 &&
statbuf.st_dev == root_dev)
{
strncpy (real_dev_root, entp->mnt_fsname, sizeof (real_dev_root) - 1);
real_dev_root[sizeof (real_dev_root) - 1] = '\0';
fclose (f);
goto found;
}
}
endmntent (f);
#ifndef HAVE_GETMNTENT_R
G_UNLOCK (getmntent);
#endif
}
/* no, that didn't work.. next we could scan /dev ... but I digress.. */
}
else
{
char *resolved;
resolved = _resolve_symlink ("/dev/root");
if (resolved != NULL)
{
strncpy (real_dev_root, resolved, sizeof (real_dev_root) - 1);
real_dev_root[sizeof (real_dev_root) - 1] = '\0';
g_free (resolved);
goto found;
}
}
}
/* bah sucks.. */
strcpy (real_dev_root, "/dev/root");
found:
return real_dev_root;
}
#endif
/* Epilogue {{{1 */
/* vim:set foldmethod=marker: */
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