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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
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 "unit.h"
#include "load-dropin.h"
#include "log.h"
#include "strv.h"
#include "unit-name.h"
#include "conf-parser.h"
#include "load-fragment.h"
#include "conf-files.h"
static int iterate_dir(
Unit *u,
const char *path,
UnitDependency dependency,
char ***strv) {
_cleanup_closedir_ DIR *d = NULL;
int r;
assert(u);
assert(path);
/* The config directories are special, since the order of the
* drop-ins matters */
if (dependency < 0) {
r = strv_extend(strv, path);
if (r < 0)
return log_oom();
return 0;
}
d = opendir(path);
if (!d) {
if (errno == ENOENT)
return 0;
return -errno;
}
for (;;) {
struct dirent *de;
_cleanup_free_ char *f = NULL;
int k;
errno = 0;
de = readdir(d);
if (!de && errno != 0) {
k = errno;
log_error("Failed to read directory %s: %s", path, strerror(k));
return -k;
}
if (!de)
break;
if (ignore_file(de->d_name))
continue;
f = strjoin(path, "/", de->d_name, NULL);
if (!f)
return log_oom();
r = unit_add_dependency_by_name(u, dependency, de->d_name, f, true);
if (r < 0)
log_error("Cannot add dependency %s to %s, ignoring: %s", de->d_name, u->id, strerror(-r));
}
return 0;
}
static int process_dir(
Unit *u,
const char *unit_path,
const char *name,
const char *suffix,
UnitDependency dependency,
char ***strv) {
_cleanup_free_ char *path = NULL;
int r;
assert(u);
assert(unit_path);
assert(name);
assert(suffix);
path = strjoin(unit_path, "/", name, suffix, NULL);
if (!path)
return log_oom();
if (!u->manager->unit_path_cache || set_get(u->manager->unit_path_cache, path)) {
r = iterate_dir(u, path, dependency, strv);
if (r < 0)
return r;
}
if (u->instance) {
_cleanup_free_ char *template = NULL, *p = NULL;
/* Also try the template dir */
template = unit_name_template(name);
if (!template)
return log_oom();
p = strjoin(unit_path, "/", template, suffix, NULL);
if (!p)
return log_oom();
if (!u->manager->unit_path_cache || set_get(u->manager->unit_path_cache, p)) {
r = iterate_dir(u, p, dependency, strv);
if (r < 0)
return r;
}
}
return 0;
}
char **unit_find_dropin_paths(Unit *u) {
_cleanup_strv_free_ char **strv = NULL;
char **configs = NULL;
Iterator i;
char *t;
int r;
assert(u);
SET_FOREACH(t, u->names, i) {
char **p;
STRV_FOREACH(p, u->manager->lookup_paths.unit_path) {
/* This loads the drop-in config snippets */
r = process_dir(u, *p, t, ".d", _UNIT_DEPENDENCY_INVALID, &strv);
if (r < 0)
return NULL;
}
}
if (strv_isempty(strv))
return NULL;
r = conf_files_list_strv(&configs, ".conf", NULL, (const char**) strv);
if (r < 0) {
log_error("Failed to get list of configuration files: %s", strerror(-r));
strv_free(configs);
return NULL;
}
return configs;
}
int unit_load_dropin(Unit *u) {
Iterator i;
char *t, **f;
int r;
assert(u);
/* Load dependencies from supplementary drop-in directories */
SET_FOREACH(t, u->names, i) {
char **p;
STRV_FOREACH(p, u->manager->lookup_paths.unit_path) {
r = process_dir(u, *p, t, ".wants", UNIT_WANTS, NULL);
if (r < 0)
return r;
r = process_dir(u, *p, t, ".requires", UNIT_REQUIRES, NULL);
if (r < 0)
return r;
}
}
u->dropin_paths = unit_find_dropin_paths(u);
if (! u->dropin_paths)
return 0;
STRV_FOREACH(f, u->dropin_paths) {
r = config_parse(u->id, *f, NULL,
UNIT_VTABLE(u)->sections, config_item_perf_lookup,
(void*) load_fragment_gperf_lookup, false, false, u);
if (r < 0)
return r;
}
u->dropin_mtime = now(CLOCK_REALTIME);
return 0;
}
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