mirror of
https://gitlab.gnome.org/GNOME/glib.git
synced 2024-11-06 09:26:17 +01:00
99571c42d5
In the typical `while (g_file_enumerator_next_file ())` patterns, there is nothing much checking whether the operation was cancelled on the GIO side. Unless the user checks for the case, this means local enumerators always run to completion even if cancelled. Fix this by checking the cancellable state explicitly for local enumerators, so there are oportunities for bailing out early if the enumerator is going through a very large directory.
465 lines
11 KiB
C
465 lines
11 KiB
C
/* 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>
|
|
*/
|
|
|
|
#include "config.h"
|
|
|
|
#include <glib.h>
|
|
#include <gcancellable.h>
|
|
#include <glocalfileenumerator.h>
|
|
#include <glocalfileinfo.h>
|
|
#include <glocalfile.h>
|
|
#include <gioerror.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include "glibintl.h"
|
|
|
|
|
|
#define CHUNK_SIZE 1000
|
|
|
|
#ifdef G_OS_WIN32
|
|
#define USE_GDIR
|
|
#endif
|
|
|
|
#ifndef USE_GDIR
|
|
|
|
#include <sys/types.h>
|
|
#include <dirent.h>
|
|
#include <errno.h>
|
|
|
|
typedef struct {
|
|
char *name;
|
|
long inode;
|
|
GFileType type;
|
|
} DirEntry;
|
|
|
|
#endif
|
|
|
|
struct _GLocalFileEnumerator
|
|
{
|
|
GFileEnumerator parent;
|
|
|
|
GFileAttributeMatcher *matcher;
|
|
GFileAttributeMatcher *reduced_matcher;
|
|
char *filename;
|
|
char *attributes;
|
|
GFileQueryInfoFlags flags;
|
|
|
|
gboolean got_parent_info;
|
|
GLocalParentFileInfo parent_info;
|
|
|
|
#ifdef USE_GDIR
|
|
GDir *dir;
|
|
#else
|
|
DIR *dir;
|
|
DirEntry *entries;
|
|
int entries_pos;
|
|
gboolean at_end;
|
|
#endif
|
|
|
|
gboolean follow_symlinks;
|
|
};
|
|
|
|
#define g_local_file_enumerator_get_type _g_local_file_enumerator_get_type
|
|
G_DEFINE_TYPE (GLocalFileEnumerator, g_local_file_enumerator, G_TYPE_FILE_ENUMERATOR)
|
|
|
|
static GFileInfo *g_local_file_enumerator_next_file (GFileEnumerator *enumerator,
|
|
GCancellable *cancellable,
|
|
GError **error);
|
|
static gboolean g_local_file_enumerator_close (GFileEnumerator *enumerator,
|
|
GCancellable *cancellable,
|
|
GError **error);
|
|
|
|
|
|
static void
|
|
free_entries (GLocalFileEnumerator *local)
|
|
{
|
|
#ifndef USE_GDIR
|
|
int i;
|
|
|
|
if (local->entries != NULL)
|
|
{
|
|
for (i = 0; local->entries[i].name != NULL; i++)
|
|
g_free (local->entries[i].name);
|
|
|
|
g_free (local->entries);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static void
|
|
g_local_file_enumerator_finalize (GObject *object)
|
|
{
|
|
GLocalFileEnumerator *local;
|
|
|
|
local = G_LOCAL_FILE_ENUMERATOR (object);
|
|
|
|
if (local->got_parent_info)
|
|
_g_local_file_info_free_parent_info (&local->parent_info);
|
|
g_free (local->filename);
|
|
g_file_attribute_matcher_unref (local->matcher);
|
|
g_file_attribute_matcher_unref (local->reduced_matcher);
|
|
if (local->dir)
|
|
{
|
|
#ifdef USE_GDIR
|
|
g_dir_close (local->dir);
|
|
#else
|
|
closedir (local->dir);
|
|
#endif
|
|
local->dir = NULL;
|
|
}
|
|
|
|
free_entries (local);
|
|
|
|
G_OBJECT_CLASS (g_local_file_enumerator_parent_class)->finalize (object);
|
|
}
|
|
|
|
|
|
static void
|
|
g_local_file_enumerator_class_init (GLocalFileEnumeratorClass *klass)
|
|
{
|
|
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
|
|
GFileEnumeratorClass *enumerator_class = G_FILE_ENUMERATOR_CLASS (klass);
|
|
|
|
gobject_class->finalize = g_local_file_enumerator_finalize;
|
|
|
|
enumerator_class->next_file = g_local_file_enumerator_next_file;
|
|
enumerator_class->close_fn = g_local_file_enumerator_close;
|
|
}
|
|
|
|
static void
|
|
g_local_file_enumerator_init (GLocalFileEnumerator *local)
|
|
{
|
|
}
|
|
|
|
#ifdef USE_GDIR
|
|
static void
|
|
convert_file_to_io_error (GError **error,
|
|
GError *file_error)
|
|
{
|
|
int new_code;
|
|
|
|
if (file_error == NULL)
|
|
return;
|
|
|
|
new_code = G_IO_ERROR_FAILED;
|
|
|
|
if (file_error->domain == G_FILE_ERROR)
|
|
{
|
|
switch (file_error->code)
|
|
{
|
|
case G_FILE_ERROR_NOENT:
|
|
new_code = G_IO_ERROR_NOT_FOUND;
|
|
break;
|
|
case G_FILE_ERROR_ACCES:
|
|
new_code = G_IO_ERROR_PERMISSION_DENIED;
|
|
break;
|
|
case G_FILE_ERROR_NOTDIR:
|
|
new_code = G_IO_ERROR_NOT_DIRECTORY;
|
|
break;
|
|
case G_FILE_ERROR_MFILE:
|
|
new_code = G_IO_ERROR_TOO_MANY_OPEN_FILES;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
g_set_error_literal (error, G_IO_ERROR,
|
|
new_code,
|
|
file_error->message);
|
|
}
|
|
#else
|
|
static GFileAttributeMatcher *
|
|
g_file_attribute_matcher_subtract_attributes (GFileAttributeMatcher *matcher,
|
|
const char * attributes)
|
|
{
|
|
GFileAttributeMatcher *result, *tmp;
|
|
|
|
tmp = g_file_attribute_matcher_new (attributes);
|
|
result = g_file_attribute_matcher_subtract (matcher, tmp);
|
|
g_file_attribute_matcher_unref (tmp);
|
|
|
|
return result;
|
|
}
|
|
#endif
|
|
|
|
GFileEnumerator *
|
|
_g_local_file_enumerator_new (GLocalFile *file,
|
|
const char *attributes,
|
|
GFileQueryInfoFlags flags,
|
|
GCancellable *cancellable,
|
|
GError **error)
|
|
{
|
|
GLocalFileEnumerator *local;
|
|
char *filename = g_file_get_path (G_FILE (file));
|
|
|
|
#ifdef USE_GDIR
|
|
GError *dir_error;
|
|
GDir *dir;
|
|
|
|
dir_error = NULL;
|
|
dir = g_dir_open (filename, 0, error != NULL ? &dir_error : NULL);
|
|
if (dir == NULL)
|
|
{
|
|
if (error != NULL)
|
|
{
|
|
convert_file_to_io_error (error, dir_error);
|
|
g_error_free (dir_error);
|
|
}
|
|
g_free (filename);
|
|
return NULL;
|
|
}
|
|
#else
|
|
DIR *dir;
|
|
int errsv;
|
|
|
|
dir = opendir (filename);
|
|
if (dir == NULL)
|
|
{
|
|
gchar *utf8_filename;
|
|
errsv = errno;
|
|
|
|
utf8_filename = g_filename_to_utf8 (filename, -1, NULL, NULL, NULL);
|
|
g_set_error (error, G_IO_ERROR,
|
|
g_io_error_from_errno (errsv),
|
|
"Error opening directory '%s': %s",
|
|
utf8_filename, g_strerror (errsv));
|
|
g_free (utf8_filename);
|
|
g_free (filename);
|
|
return NULL;
|
|
}
|
|
|
|
#endif
|
|
|
|
local = g_object_new (G_TYPE_LOCAL_FILE_ENUMERATOR,
|
|
"container", file,
|
|
NULL);
|
|
|
|
local->dir = dir;
|
|
local->filename = filename;
|
|
local->matcher = g_file_attribute_matcher_new (attributes);
|
|
#ifndef USE_GDIR
|
|
local->reduced_matcher = g_file_attribute_matcher_subtract_attributes (local->matcher,
|
|
G_LOCAL_FILE_INFO_NOSTAT_ATTRIBUTES","
|
|
"standard::type");
|
|
#endif
|
|
local->flags = flags;
|
|
|
|
return G_FILE_ENUMERATOR (local);
|
|
}
|
|
|
|
#ifndef USE_GDIR
|
|
static int
|
|
sort_by_inode (const void *_a, const void *_b)
|
|
{
|
|
const DirEntry *a, *b;
|
|
|
|
a = _a;
|
|
b = _b;
|
|
return a->inode - b->inode;
|
|
}
|
|
|
|
#ifdef HAVE_STRUCT_DIRENT_D_TYPE
|
|
static GFileType
|
|
file_type_from_dirent (char d_type)
|
|
{
|
|
switch (d_type)
|
|
{
|
|
case DT_BLK:
|
|
case DT_CHR:
|
|
case DT_FIFO:
|
|
case DT_SOCK:
|
|
return G_FILE_TYPE_SPECIAL;
|
|
case DT_DIR:
|
|
return G_FILE_TYPE_DIRECTORY;
|
|
case DT_LNK:
|
|
return G_FILE_TYPE_SYMBOLIC_LINK;
|
|
case DT_REG:
|
|
return G_FILE_TYPE_REGULAR;
|
|
case DT_UNKNOWN:
|
|
default:
|
|
return G_FILE_TYPE_UNKNOWN;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
static const char *
|
|
next_file_helper (GLocalFileEnumerator *local, GFileType *file_type)
|
|
{
|
|
struct dirent *entry;
|
|
const char *filename;
|
|
int i;
|
|
|
|
if (local->at_end)
|
|
return NULL;
|
|
|
|
if (local->entries == NULL ||
|
|
(local->entries[local->entries_pos].name == NULL))
|
|
{
|
|
if (local->entries == NULL)
|
|
local->entries = g_new (DirEntry, CHUNK_SIZE + 1);
|
|
else
|
|
{
|
|
/* Restart by clearing old names */
|
|
for (i = 0; local->entries[i].name != NULL; i++)
|
|
g_free (local->entries[i].name);
|
|
}
|
|
|
|
for (i = 0; i < CHUNK_SIZE; i++)
|
|
{
|
|
entry = readdir (local->dir);
|
|
while (entry
|
|
&& (0 == strcmp (entry->d_name, ".") ||
|
|
0 == strcmp (entry->d_name, "..")))
|
|
entry = readdir (local->dir);
|
|
|
|
if (entry)
|
|
{
|
|
local->entries[i].name = g_strdup (entry->d_name);
|
|
local->entries[i].inode = entry->d_ino;
|
|
#if HAVE_STRUCT_DIRENT_D_TYPE
|
|
local->entries[i].type = file_type_from_dirent (entry->d_type);
|
|
#else
|
|
local->entries[i].type = G_FILE_TYPE_UNKNOWN;
|
|
#endif
|
|
}
|
|
else
|
|
break;
|
|
}
|
|
local->entries[i].name = NULL;
|
|
local->entries_pos = 0;
|
|
|
|
qsort (local->entries, i, sizeof (DirEntry), sort_by_inode);
|
|
}
|
|
|
|
filename = local->entries[local->entries_pos].name;
|
|
if (filename == NULL)
|
|
local->at_end = TRUE;
|
|
|
|
*file_type = local->entries[local->entries_pos].type;
|
|
|
|
local->entries_pos++;
|
|
|
|
return filename;
|
|
}
|
|
|
|
#endif
|
|
|
|
static GFileInfo *
|
|
g_local_file_enumerator_next_file (GFileEnumerator *enumerator,
|
|
GCancellable *cancellable,
|
|
GError **error)
|
|
{
|
|
GLocalFileEnumerator *local = G_LOCAL_FILE_ENUMERATOR (enumerator);
|
|
const char *filename;
|
|
char *path;
|
|
GFileInfo *info;
|
|
GError *my_error;
|
|
GFileType file_type;
|
|
|
|
if (!local->got_parent_info)
|
|
{
|
|
_g_local_file_info_get_parent_info (local->filename, local->matcher, &local->parent_info);
|
|
local->got_parent_info = TRUE;
|
|
}
|
|
|
|
next_file:
|
|
|
|
if (g_cancellable_set_error_if_cancelled (cancellable, error))
|
|
return NULL;
|
|
|
|
#ifdef USE_GDIR
|
|
filename = g_dir_read_name (local->dir);
|
|
file_type = G_FILE_TYPE_UNKNOWN;
|
|
#else
|
|
filename = next_file_helper (local, &file_type);
|
|
#endif
|
|
|
|
if (filename == NULL)
|
|
return NULL;
|
|
|
|
my_error = NULL;
|
|
path = g_build_filename (local->filename, filename, NULL);
|
|
if (file_type == G_FILE_TYPE_UNKNOWN ||
|
|
(file_type == G_FILE_TYPE_SYMBOLIC_LINK && !(local->flags & G_FILE_QUERY_INFO_NOFOLLOW_SYMLINKS)))
|
|
{
|
|
info = _g_local_file_info_get (filename, path,
|
|
local->matcher,
|
|
local->flags,
|
|
&local->parent_info,
|
|
&my_error);
|
|
}
|
|
else
|
|
{
|
|
info = _g_local_file_info_get (filename, path,
|
|
local->reduced_matcher,
|
|
local->flags,
|
|
&local->parent_info,
|
|
&my_error);
|
|
if (info)
|
|
{
|
|
_g_local_file_info_get_nostat (info, filename, path, local->matcher);
|
|
g_file_info_set_file_type (info, file_type);
|
|
if (file_type == G_FILE_TYPE_SYMBOLIC_LINK)
|
|
g_file_info_set_is_symlink (info, TRUE);
|
|
}
|
|
}
|
|
g_free (path);
|
|
|
|
if (info == NULL)
|
|
{
|
|
/* Failed to get info */
|
|
/* If the file does not exist there might have been a race where
|
|
* the file was removed between the readdir and the stat, so we
|
|
* ignore the file. */
|
|
if (g_error_matches (my_error, G_IO_ERROR, G_IO_ERROR_NOT_FOUND))
|
|
{
|
|
g_error_free (my_error);
|
|
goto next_file;
|
|
}
|
|
else
|
|
g_propagate_error (error, my_error);
|
|
}
|
|
|
|
return info;
|
|
}
|
|
|
|
static gboolean
|
|
g_local_file_enumerator_close (GFileEnumerator *enumerator,
|
|
GCancellable *cancellable,
|
|
GError **error)
|
|
{
|
|
GLocalFileEnumerator *local = G_LOCAL_FILE_ENUMERATOR (enumerator);
|
|
|
|
if (local->dir)
|
|
{
|
|
#ifdef USE_GDIR
|
|
g_dir_close (local->dir);
|
|
#else
|
|
closedir (local->dir);
|
|
#endif
|
|
local->dir = NULL;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|