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/***
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 "conf-parser.h"
#include "fs-util.h"
#include "load-dropin.h"
#include "load-fragment.h"
#include "log.h"
#include "stat-util.h"
#include "string-util.h"
#include "strv.h"
#include "unit-name.h"
#include "unit.h"
static bool unit_name_compatible(const char *a, const char *b) {
_cleanup_free_ char *prefix = NULL;
int r;
/* the straightforward case: the symlink name matches the target */
if (streq(a, b))
return true;
r = unit_name_template(a, &prefix);
if (r < 0) {
log_oom();
return true;
}
/* an instance name points to a target that is just the template name */
if (streq(prefix, b))
return true;
return false;
}
static int process_deps(Unit *u, UnitDependency dependency, const char *dir_suffix) {
_cleanup_strv_free_ char **paths = NULL;
char **p;
int r;
r = unit_file_find_dropin_paths(NULL,
u->manager->lookup_paths.search_path,
u->manager->unit_path_cache,
dir_suffix,
NULL,
u->names,
&paths);
if (r < 0)
return r;
STRV_FOREACH(p, paths) {
const char *entry;
_cleanup_free_ char *target = NULL;
entry = basename(*p);
if (null_or_empty_path(*p) > 0) {
/* an error usually means an invalid symlink, which is not a mask */
log_unit_debug(u, "%s dependency on %s is masked by %s, ignoring.",
unit_dependency_to_string(dependency), entry, *p);
continue;
}
r = is_symlink(*p);
if (r < 0) {
log_unit_warning_errno(u, r, "%s dropin %s unreadable, ignoring: %m",
unit_dependency_to_string(dependency), *p);
continue;
}
if (r == 0) {
log_unit_warning(u, "%s dependency dropin %s is not a symlink, ignoring.",
unit_dependency_to_string(dependency), *p);
continue;
}
if (!unit_name_is_valid(entry, UNIT_NAME_ANY)) {
log_unit_warning(u, "%s dependency dropin %s is not a valid unit name, ignoring.",
unit_dependency_to_string(dependency), *p);
continue;
}
r = readlink_malloc(*p, &target);
if (r < 0) {
log_unit_warning_errno(u, r, "readlink(\"%s\") failed, ignoring: %m", *p);
continue;
}
/* We don't treat this as an error, especially because we didn't check this for a
* long time. Nevertheless, we warn, because such mismatch can be mighty confusing. */
if (!unit_name_compatible(entry, basename(target)))
log_unit_warning(u, "%s dependency dropin %s target %s has different name",
unit_dependency_to_string(dependency), *p, target);
r = unit_add_dependency_by_name(u, dependency, entry, *p, true);
if (r < 0)
log_unit_error_errno(u, r, "cannot add %s dependency on %s, ignoring: %m",
unit_dependency_to_string(dependency), entry);
}
return 0;
}
int unit_load_dropin(Unit *u) {
_cleanup_strv_free_ char **l = NULL;
char **f;
int r;
assert(u);
/* Load dependencies from .wants and .requires directories */
r = process_deps(u, UNIT_WANTS, ".wants");
if (r < 0)
return r;
r = process_deps(u, UNIT_REQUIRES, ".requires");
if (r < 0)
return r;
/* Load .conf dropins */
r = unit_find_dropin_paths(u, &l);
if (r <= 0)
return 0;
if (!u->dropin_paths) {
u->dropin_paths = l;
l = NULL;
} else {
r = strv_extend_strv(&u->dropin_paths, l, true);
if (r < 0)
return log_oom();
}
STRV_FOREACH(f, u->dropin_paths) {
config_parse(u->id, *f, NULL,
UNIT_VTABLE(u)->sections,
config_item_perf_lookup, load_fragment_gperf_lookup,
false, false, false, u);
}
u->dropin_mtime = now(CLOCK_REALTIME);
return 0;
}
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