systemd/0001-conf-parser-introduce-early-drop-ins.patch
Dominique Leuenberger 441419a1e6 Accepting request 902866 from Base:System
- Import commit e9a23d9e064c2e7ac21a1b984d116bcf15327e63
  8dd19c6ee3 sd-device: allow to read sysattr which contains embedded NUL
  d52409e5fe pid1: only add a Wants= type dependency on /tmp when PrivateTmp=yes (bsc#1181970

- Import commit fcdb8dce591db2f5fc3c1e3eeb7abe9a2090b401
  aa2d840a3b compat-rules: fix warning: "label ‘out’ defined but not used" in path_id_compat.c
- Restore 61-persistent-storage-compat.rules that was mistakenly
  dropped during the merge of v248.

- Create /run/lock/subsys again (bsc#1187292)
  The creation of this directory was mistakenly dropped when
  'filesystem' package took the initialization of the generic paths
  over.
  Paths under /run/lock are still managed by systemd for lack of
  better place.

- Drop systemd's dependency on udev (jsc#PM-2677)
  In some environments (i.e. containers) udev is usually not necessary
  but pulls in unnecessary packages.

- Now that chkconfig/insserv are history, let's implement the strict
  minimum in systemd-sysv-install to enable/disable SysV init scripts
  (bsc#1186595 bsc#1186359)
  Indeed there's no much point in dropping SysV support completely
  until upstream will do especially since 3rd party applications such
  as vmware still rely on it, see bsc#1186359).

- Allow the sysusers config files shipped by systemd rpms to be
  overriden during system installation (bsc#1171962)
- While at it, add a comment to explain why we don't use

OBS-URL: https://build.opensuse.org/request/show/902866
OBS-URL: https://build.opensuse.org/package/show/openSUSE:Factory/systemd?expand=0&rev=330
2021-07-01 05:05:27 +00:00

348 lines
14 KiB
Diff

From 0eb84d049c77dceeb48724770f89f0fa01557c87 Mon Sep 17 00:00:00 2001
From: Franck Bui <fbui@suse.com>
Date: Fri, 22 Jan 2021 14:57:08 +0100
Subject: [PATCH 1/1] conf-parser: introduce 'early' drop-ins
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
As formerly known as "downstream conf file drop-ins should never override main
user conf file".
Previously all drop-ins, including those shipped by downstream, shipped in
/usr, could override user's main configuration file (located in /etc) because
the main file was always parsed first.
This was problematic for downstreams because their customization should never
override the users one in general. Therefore the only way to make this logic
usable was by teaching users to never use the main conf files and to put all
theirs settings in drop-ins with a higher priority than the one downsteam would
use. However customizing the defaults through the main conf file is something
very well established since a long time hence this is not something
conceivable.
This patch reworks the way we parse configuration files by introducing "early"
conf files (idea from Zbigniew Jędrzejewski-Szmek), which always have a
priority lower than the main config file and hence other conf file drop-ins
too.
Early conf files can be located in any locations where regular conf snippets
can be installed and are sorted between them using the same sorting rules that
apply to other conf files. A conf file is considered as an early one if its
filename is prefixed with "__" (double underscore).
Hence for example, drop-in "/usr/lib/systemd/logind.conf.d/__99-foo.conf" will
always be parsed before:
/etc/systemd/logind.conf
/etc/systemd/logind.conf.d/00-foo.conf
/usr/lib/systemd/logind.conf.d/00-foo.conf
This change isn't backwards-compatible, but the '__' prefix is something that
is unlikely used. Hence the risk should be very low.
Unfortunately upstream is not seing this problem as a serious one and accept
that vendors' configuration files can take precedence over the main
configuration files (placed in /etc). See the following links for the
related discussions:
https://github.com/systemd/systemd/issues/2121 (initial issue report)
https://github.com/systemd/systemd/pull/17161 (first attempt to solve this issue)
https://github.com/systemd/systemd/pull/18347 (introduction of early drop-in)
Since SUSE heavily relies on drop-ins to customize some of the upstream default
settings, there was no other choice than to diverge from upstream in this
regard.
But it should be noted that these early drop-ins are strictly reserved for SUSE
own purpose only. IOW users should never use them and early drop-ins should
never be created in /etc but only in /usr. We reserve the right to change or
drop this feature at any time.
Fixes: #2121
---
src/shared/conf-parser.c | 48 ++++++++++--
src/test/test-conf-parser.c | 152 ++++++++++++++++++++++++++++++++++++
2 files changed, 195 insertions(+), 5 deletions(-)
diff --git a/src/shared/conf-parser.c b/src/shared/conf-parser.c
index 9dfa190751..b5dee9cbb1 100644
--- a/src/shared/conf-parser.c
+++ b/src/shared/conf-parser.c
@@ -428,6 +428,7 @@ int config_parse(
static int config_parse_many_files(
const char* const* conf_files,
+ char **early_files,
char **files,
const char *sections,
ConfigItemLookup lookup,
@@ -440,6 +441,12 @@ static int config_parse_many_files(
char **fn;
int r;
+ STRV_FOREACH(fn, early_files) {
+ r = config_parse(NULL, *fn, NULL, sections, lookup, table, flags, userdata, &mtime);
+ if (r < 0)
+ return r;
+ }
+
/* First read the first found main config file. */
STRV_FOREACH(fn, (char**) conf_files) {
r = config_parse(NULL, *fn, NULL, sections, lookup, table, flags, userdata, &mtime);
@@ -462,6 +469,28 @@ static int config_parse_many_files(
return 0;
}
+static int config_parse_split_conf_files(char **files, char ***early_files, char ***late_files) {
+ char **f;
+
+ assert(files);
+ assert(early_files);
+ assert(late_files);
+
+ STRV_FOREACH(f, files) {
+ char ***s, *p;
+
+ p = strdup(*f);
+ if (!p)
+ return log_oom();
+
+ s = startswith(basename(*f), "__") ? early_files : late_files;
+ if (strv_push(s, p) < 0)
+ return log_oom();
+ }
+
+ return 0;
+}
+
/* Parse each config file in the directories specified as nulstr. */
int config_parse_many_nulstr(
const char *conf_file,
@@ -473,15 +502,19 @@ int config_parse_many_nulstr(
void *userdata,
usec_t *ret_mtime) {
- _cleanup_strv_free_ char **files = NULL;
+ _cleanup_strv_free_ char **files = NULL, **early_files = NULL, **late_files = NULL;
int r;
r = conf_files_list_nulstr(&files, ".conf", NULL, 0, conf_file_dirs);
if (r < 0)
return r;
- return config_parse_many_files(STRV_MAKE_CONST(conf_file),
- files, sections, lookup, table, flags, userdata,
+ r = config_parse_split_conf_files(files, &early_files, &late_files);
+ if (r < 0)
+ return r;
+
+ return config_parse_many_files(STRV_MAKE_CONST(conf_file), early_files, late_files,
+ sections, lookup, table, flags, userdata,
ret_mtime);
}
@@ -497,8 +530,8 @@ int config_parse_many(
void *userdata,
usec_t *ret_mtime) {
+ _cleanup_strv_free_ char **files = NULL, **early_files = NULL, **late_files = NULL;
_cleanup_strv_free_ char **dropin_dirs = NULL;
- _cleanup_strv_free_ char **files = NULL;
const char *suffix;
int r;
@@ -511,7 +544,12 @@ int config_parse_many(
if (r < 0)
return r;
- return config_parse_many_files(conf_files, files, sections, lookup, table, flags, userdata, ret_mtime);
+ r = config_parse_split_conf_files(files, &early_files, &late_files);
+ if (r < 0)
+ return r;
+
+ return config_parse_many_files(conf_files, early_files, late_files,
+ sections, lookup, table, flags, userdata, ret_mtime);
}
#define DEFINE_PARSER(type, vartype, conv_func) \
diff --git a/src/test/test-conf-parser.c b/src/test/test-conf-parser.c
index 5da864347e..77d9f28a79 100644
--- a/src/test/test-conf-parser.c
+++ b/src/test/test-conf-parser.c
@@ -5,6 +5,9 @@
#include "fs-util.h"
#include "log.h"
#include "macro.h"
+#include "mkdir.h"
+#include "path-util.h"
+#include "rm-rf.h"
#include "string-util.h"
#include "strv.h"
#include "tmpfile-util.h"
@@ -385,6 +388,152 @@ static void test_config_parse(unsigned i, const char *s) {
}
}
+static void setup_conf_files(const char *root, bool is_main, char **conf_files, char ***ret_conf_dirs) {
+ char **path;
+
+ /* If 'is_main' is true then 'conf_files' should only contain an entry
+ * for the main conf file. */
+ if (is_main)
+ assert_se(strv_length(conf_files) <= 1);
+
+ STRV_FOREACH(path, conf_files) {
+ _cleanup_free_ char *abspath = NULL;
+ _cleanup_fclose_ FILE *f = NULL;
+
+ abspath = path_join(root, *path);
+ assert_se(abspath);
+
+ (void) mkdir_parents(abspath, 0755);
+
+ f = fopen(abspath, "w");
+ assert_se(f);
+ fprintf(f,
+ "[Section]\n"
+ "name=%s\n",
+ *path);
+
+ if (!is_main)
+ fprintf(f,
+ "%s=%s\n",
+ startswith(basename(*path), "__") ? "early" : "late",
+ *path);
+
+ if (ret_conf_dirs) {
+ char *d;
+
+ assert_se((d = dirname_malloc(abspath)));
+ assert_se(strv_push(ret_conf_dirs, d) == 0);
+ }
+ }
+
+ if (ret_conf_dirs) {
+ strv_uniq(*ret_conf_dirs);
+ strv_sort(*ret_conf_dirs);
+ }
+}
+
+static void test_config_parse_many_one(bool nulstr, const char *main, char **conf_files,
+ const char *name, const char *early, const char *late) {
+
+ _cleanup_free_ char *parsed_name = NULL, *parsed_early = NULL, *parsed_late = NULL;
+ _cleanup_strv_free_ char **conf_dirs = NULL;
+ _cleanup_free_ char *conf_dirs_nulstr = NULL;
+ char *conf_file;
+ char *tmp_dir;
+ size_t size;
+ int r;
+
+ const ConfigTableItem items[] = {
+ { "Section", "name", config_parse_string, 0, &parsed_name},
+ { "Section", "late", config_parse_string, 0, &parsed_late},
+ { "Section", "early", config_parse_string, 0, &parsed_early},
+ };
+
+ tmp_dir = strdupa("/tmp/test-conf-parser-XXXXXX");
+ assert_se(mkdtemp(tmp_dir));
+
+ setup_conf_files(tmp_dir, true, STRV_MAKE(main), NULL);
+ setup_conf_files(tmp_dir, false, conf_files, &conf_dirs);
+
+ conf_file = main ? strjoina(tmp_dir, "/", main) : NULL;
+
+ if (nulstr) {
+ r = strv_make_nulstr(conf_dirs, &conf_dirs_nulstr, &size);
+ assert_se(r == 0);
+
+ r = config_parse_many_nulstr(conf_file, conf_dirs_nulstr,
+ "Section\0",
+ config_item_table_lookup, items,
+ CONFIG_PARSE_WARN,
+ NULL,
+ NULL);
+ } else {
+ r = config_parse_many(STRV_MAKE_CONST(conf_file),
+ (const char * const*) conf_dirs, "",
+ "Section\0",
+ config_item_table_lookup, items,
+ CONFIG_PARSE_WARN,
+ NULL,
+ NULL);
+ }
+
+ assert_se(r == 0);
+ assert_se((!name && !parsed_name) || streq(name, parsed_name));
+ assert_se((!late && !parsed_late) || streq(late, parsed_late));
+ assert_se((!early && !parsed_early) || streq(early, parsed_early));
+
+ assert_se(rm_rf(tmp_dir, REMOVE_ROOT|REMOVE_PHYSICAL) == 0);
+}
+
+static void test_config_parse_many(bool nulstr) {
+ log_info("== %s%s ==", __func__, nulstr ? "_nulstr" : "");
+
+ test_config_parse_many_one(nulstr, NULL, NULL, NULL, NULL, NULL);
+
+ test_config_parse_many_one(nulstr,
+ "dir/main.conf", NULL,
+ "dir/main.conf", NULL, NULL);
+
+ test_config_parse_many_one(nulstr,
+ NULL, STRV_MAKE("dir1/50-foo.conf"),
+ "dir1/50-foo.conf", NULL, "dir1/50-foo.conf");
+
+ test_config_parse_many_one(nulstr,
+ NULL, STRV_MAKE("dir1/__50-foo.conf"),
+ "dir1/__50-foo.conf", "dir1/__50-foo.conf", NULL);
+
+ test_config_parse_many_one(nulstr,
+ NULL, STRV_MAKE("dir1/10-foo.conf", "dir1/50-bar.conf"),
+ "dir1/50-bar.conf", NULL, "dir1/50-bar.conf");
+
+ test_config_parse_many_one(nulstr,
+ NULL, STRV_MAKE("dir1/50-foo.conf", "dir2/10-bar.conf"),
+ "dir1/50-foo.conf", NULL, "dir1/50-foo.conf");
+
+ test_config_parse_many_one(nulstr,
+ NULL, STRV_MAKE("dir1/10-foo.conf", "dir2/10-foo.conf"),
+ "dir1/10-foo.conf", NULL, "dir1/10-foo.conf");
+
+ /* Early conf files should never override the main one whatever their
+ * priority/location. */
+ test_config_parse_many_one(nulstr,
+ "dir/10-main.conf",
+ STRV_MAKE("dir1/__10-foo.conf", "dir2/__99-foo.conf"),
+ "dir/10-main.conf", "dir2/__99-foo.conf", NULL);
+
+ /* Late conf files always take precendence over the early conf files
+ * and the main one. */
+ test_config_parse_many_one(nulstr,
+ "dir/50-main.conf", STRV_MAKE("dir1/10-foo.conf"),
+ "dir1/10-foo.conf", NULL, "dir1/10-foo.conf");
+
+ test_config_parse_many_one(nulstr,
+ "dir/10-main.conf",
+ STRV_MAKE("dir1/__10-foo.conf", "dir2/__99-foo.conf",
+ "dir2/10-foo.conf"),
+ "dir2/10-foo.conf", "dir2/__99-foo.conf", "dir2/10-foo.conf");
+}
+
int main(int argc, char **argv) {
unsigned i;
@@ -407,5 +556,8 @@ int main(int argc, char **argv) {
for (i = 0; i < ELEMENTSOF(config_file); i++)
test_config_parse(i, config_file[i]);
+ test_config_parse_many(true);
+ test_config_parse_many(false);
+
return 0;
}
--
2.26.2