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/* SPDX-License-Identifier: LGPL-2.1+ */
/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
***/
#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 int unit_name_compatible(const char *a, const char *b) {
_cleanup_free_ char *template = NULL;
int r;
/* The straightforward case: the symlink name matches the target */
if (streq(a, b))
return 1;
r = unit_name_template(a, &template);
if (r == -EINVAL)
return 0; /* Not a template */
if (r < 0)
return r; /* OOM, or some other failure. Just skip the warning. */
/* An instance name points to a target that is just the template name */
return streq(template, b);
}
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. */
r = unit_name_compatible(entry, basename(target));
if (r < 0) {
log_unit_warning_errno(u, r, "Can't check if names %s and %s are compatible, ignoring: %m", entry, basename(target));
continue;
}
if (r == 0)
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, UNIT_DEPENDENCY_FILE);
if (r < 0)
log_unit_warning_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 = TAKE_PTR(l);
else {
r = strv_extend_strv(&u->dropin_paths, l, true);
if (r < 0)
return log_oom();
}
STRV_FOREACH(f, u->dropin_paths)
(void) config_parse(u->id, *f, NULL,
UNIT_VTABLE(u)->sections,
config_item_perf_lookup, load_fragment_gperf_lookup,
0, u);
u->dropin_mtime = now(CLOCK_REALTIME);
return 0;
}
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