d16a1c1bb6
When used in a package installation script, we want to invoke systemd-sysusers before that package is installed (so it can contain files owned by the newly created user), so the configuration to use is specified on the command line. This should be a copy of the configuration that will be installed as /usr/lib/sysusers.d/package.conf. We still want to obey any overrides in /etc/sysusers.d or /run/sysusers.d in the usual fashion. Otherwise, we'd get a different result when systemd-sysusers is run with a copy of the new config on the command line and when systemd-sysusers is run at boot after package instalation. In the second case any files in /etc or /run have higher priority, so the same should happen when the configuration is given on the command line. More generally, we want the behaviour in this special case to be as close to the case where the file is finally on disk as possible, so we have to read all configuration files, since they all might contain overrides and additional configuration that matters. Even files that have lower priority might specify additional groups for the user we are creating. Thus, we need to read all configuration, but insert our new configuration somewhere with the right priority. If --target=/path/to/file.conf is given on the command line, we gather the list of files, and pretend that the command-line config is read from /path/to/file.conf (doesn't matter if the file on disk actually exists or not). All package scripts should use this option to obtain consistent and idempotent behaviour. The corner case when --target= is specified and there are no positional arguments is disallowed. v1: - version with --config-name= v2: - disallow --config-name= and no positional args v3: - remove --config-name= v4: - add --target= and rework the code completely v5: - fix argcounting bug and add example in man page v6: - rename --target to --replace
260 lines
9 KiB
C
260 lines
9 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
|
|
/***
|
|
This file is part of systemd.
|
|
|
|
Copyright 2010 Lennart Poettering
|
|
|
|
systemd 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.
|
|
|
|
systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>.
|
|
***/
|
|
|
|
#include <dirent.h>
|
|
#include <errno.h>
|
|
#include <stdarg.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#include "conf-files.h"
|
|
#include "dirent-util.h"
|
|
#include "fd-util.h"
|
|
#include "hashmap.h"
|
|
#include "log.h"
|
|
#include "macro.h"
|
|
#include "missing.h"
|
|
#include "path-util.h"
|
|
#include "stat-util.h"
|
|
#include "string-util.h"
|
|
#include "strv.h"
|
|
#include "util.h"
|
|
|
|
static int files_add(Hashmap *h, const char *suffix, const char *root, unsigned flags, const char *path) {
|
|
_cleanup_closedir_ DIR *dir = NULL;
|
|
const char *dirpath;
|
|
struct dirent *de;
|
|
int r;
|
|
|
|
assert(path);
|
|
|
|
dirpath = prefix_roota(root, path);
|
|
|
|
dir = opendir(dirpath);
|
|
if (!dir) {
|
|
if (errno == ENOENT)
|
|
return 0;
|
|
return -errno;
|
|
}
|
|
|
|
FOREACH_DIRENT(de, dir, return -errno) {
|
|
char *p;
|
|
|
|
if (!dirent_is_file_with_suffix(de, suffix)) {
|
|
log_debug("Ignoring %s/%s, because it's not a regular file with suffix %s.", dirpath, de->d_name, strna(suffix));
|
|
continue;
|
|
}
|
|
|
|
if (flags & CONF_FILES_EXECUTABLE) {
|
|
struct stat st;
|
|
|
|
/* As requested: check if the file is marked exectuable. Note that we don't check access(X_OK)
|
|
* here, as we care about whether the file is marked executable at all, and not whether it is
|
|
* executable for us, because if such errors are stuff we should log about. */
|
|
|
|
if (fstatat(dirfd(dir), de->d_name, &st, 0) < 0) {
|
|
log_debug_errno(errno, "Failed to stat %s/%s, ignoring: %m", dirpath, de->d_name);
|
|
continue;
|
|
}
|
|
|
|
if (!null_or_empty(&st)) {
|
|
/* A mask is a symlink to /dev/null or an empty file. It does not even
|
|
* have to be executable. Other entries must be regular executable files
|
|
* or symlinks to them. */
|
|
if (S_ISREG(st.st_mode)) {
|
|
if ((st.st_mode & 0111) == 0) { /* not executable */
|
|
log_debug("Ignoring %s/%s, as it is not marked executable.",
|
|
dirpath, de->d_name);
|
|
continue;
|
|
}
|
|
} else {
|
|
log_debug("Ignoring %s/%s, as it is neither a regular file nor a mask.",
|
|
dirpath, de->d_name);
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
|
|
p = strjoin(dirpath, "/", de->d_name);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
r = hashmap_put(h, basename(p), p);
|
|
if (r == -EEXIST) {
|
|
log_debug("Skipping overridden file: %s.", p);
|
|
free(p);
|
|
} else if (r < 0) {
|
|
free(p);
|
|
return r;
|
|
} else if (r == 0) {
|
|
log_debug("Duplicate file %s", p);
|
|
free(p);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int base_cmp(const void *a, const void *b) {
|
|
const char *s1, *s2;
|
|
|
|
s1 = *(char * const *)a;
|
|
s2 = *(char * const *)b;
|
|
return strcmp(basename(s1), basename(s2));
|
|
}
|
|
|
|
static int conf_files_list_strv_internal(char ***strv, const char *suffix, const char *root, unsigned flags, char **dirs) {
|
|
_cleanup_hashmap_free_ Hashmap *fh = NULL;
|
|
char **files, **p;
|
|
int r;
|
|
|
|
assert(strv);
|
|
|
|
/* This alters the dirs string array */
|
|
if (!path_strv_resolve_uniq(dirs, root))
|
|
return -ENOMEM;
|
|
|
|
fh = hashmap_new(&string_hash_ops);
|
|
if (!fh)
|
|
return -ENOMEM;
|
|
|
|
STRV_FOREACH(p, dirs) {
|
|
r = files_add(fh, suffix, root, flags, *p);
|
|
if (r == -ENOMEM)
|
|
return r;
|
|
if (r < 0)
|
|
log_debug_errno(r, "Failed to search for files in %s, ignoring: %m", *p);
|
|
}
|
|
|
|
files = hashmap_get_strv(fh);
|
|
if (!files)
|
|
return -ENOMEM;
|
|
|
|
qsort_safe(files, hashmap_size(fh), sizeof(char *), base_cmp);
|
|
*strv = files;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int conf_files_insert(char ***strv, const char *root, const char *dirs, const char *path) {
|
|
/* Insert a path into strv, at the place honouring the usual sorting rules:
|
|
* - we first compare by the basename
|
|
* - and then we compare by dirname, allowing just one file with the given
|
|
* basename.
|
|
* This means that we will
|
|
* - add a new entry if basename(path) was not on the list,
|
|
* - do nothing if an entry with higher priority was already present,
|
|
* - do nothing if our new entry matches the existing entry,
|
|
* - replace the existing entry if our new entry has higher priority.
|
|
*/
|
|
char *t;
|
|
unsigned i;
|
|
int r;
|
|
|
|
for (i = 0; i < strv_length(*strv); i++) {
|
|
int c;
|
|
|
|
c = base_cmp(*strv + i, &path);
|
|
if (c == 0) {
|
|
const char *dir;
|
|
|
|
/* Oh, we found our spot and it already contains something. */
|
|
NULSTR_FOREACH(dir, dirs) {
|
|
char *p1, *p2;
|
|
|
|
p1 = path_startswith((*strv)[i], root);
|
|
if (p1)
|
|
/* Skip "/" in dir, because p1 is without "/" too */
|
|
p1 = path_startswith(p1, dir + 1);
|
|
if (p1)
|
|
/* Existing entry with higher priority
|
|
* or same priority, no need to do anything. */
|
|
return 0;
|
|
|
|
p2 = path_startswith(path, dir);
|
|
if (p2) {
|
|
/* Our new entry has higher priority */
|
|
t = path_join(root, path, NULL);
|
|
if (!t)
|
|
return log_oom();
|
|
|
|
return free_and_replace((*strv)[i], t);
|
|
}
|
|
}
|
|
|
|
} else if (c > 0)
|
|
/* Following files have lower priority, let's go insert our
|
|
* new entry. */
|
|
break;
|
|
|
|
/* … we are not there yet, let's continue */
|
|
}
|
|
|
|
t = path_join(root, path, NULL);
|
|
if (!t)
|
|
return log_oom();
|
|
|
|
r = strv_insert(strv, i, t);
|
|
if (r < 0)
|
|
free(t);
|
|
return r;
|
|
}
|
|
|
|
int conf_files_list_strv(char ***strv, const char *suffix, const char *root, unsigned flags, const char* const* dirs) {
|
|
_cleanup_strv_free_ char **copy = NULL;
|
|
|
|
assert(strv);
|
|
|
|
copy = strv_copy((char**) dirs);
|
|
if (!copy)
|
|
return -ENOMEM;
|
|
|
|
return conf_files_list_strv_internal(strv, suffix, root, flags, copy);
|
|
}
|
|
|
|
int conf_files_list(char ***strv, const char *suffix, const char *root, unsigned flags, const char *dir, ...) {
|
|
_cleanup_strv_free_ char **dirs = NULL;
|
|
va_list ap;
|
|
|
|
assert(strv);
|
|
|
|
va_start(ap, dir);
|
|
dirs = strv_new_ap(dir, ap);
|
|
va_end(ap);
|
|
|
|
if (!dirs)
|
|
return -ENOMEM;
|
|
|
|
return conf_files_list_strv_internal(strv, suffix, root, flags, dirs);
|
|
}
|
|
|
|
int conf_files_list_nulstr(char ***strv, const char *suffix, const char *root, unsigned flags, const char *d) {
|
|
_cleanup_strv_free_ char **dirs = NULL;
|
|
|
|
assert(strv);
|
|
|
|
dirs = strv_split_nulstr(d);
|
|
if (!dirs)
|
|
return -ENOMEM;
|
|
|
|
return conf_files_list_strv_internal(strv, suffix, root, flags, dirs);
|
|
}
|