dropin.c revision b5efdb8af40ea759a1ea584c1bc44ecc81dd00ce
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2014 Zbigniew Jędrzejewski-Szmek
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 "alloc-util.h"
#include "conf-files.h"
#include "dropin.h"
#include "escape.h"
#include "fd-util.h"
#include "fileio-label.h"
#include "mkdir.h"
#include "path-util.h"
#include "string-util.h"
#include "strv.h"
#include "util.h"
int drop_in_file(const char *dir, const char *unit, unsigned level,
const char *name, char **_p, char **_q) {
_cleanup_free_ char *b = NULL;
char *p, *q;
char prefix[DECIMAL_STR_MAX(unsigned)];
assert(unit);
assert(name);
assert(_p);
assert(_q);
sprintf(prefix, "%u", level);
b = xescape(name, "/.");
if (!b)
return -ENOMEM;
if (!filename_is_valid(b))
return -EINVAL;
p = strjoin(dir, "/", unit, ".d", NULL);
if (!p)
return -ENOMEM;
q = strjoin(p, "/", prefix, "-", b, ".conf", NULL);
if (!q) {
free(p);
return -ENOMEM;
}
*_p = p;
*_q = q;
return 0;
}
int write_drop_in(const char *dir, const char *unit, unsigned level,
const char *name, const char *data) {
_cleanup_free_ char *p = NULL, *q = NULL;
int r;
assert(dir);
assert(unit);
assert(name);
assert(data);
r = drop_in_file(dir, unit, level, name, &p, &q);
if (r < 0)
return r;
(void) mkdir_p(p, 0755);
return write_string_file_atomic_label(q, data);
}
int write_drop_in_format(const char *dir, const char *unit, unsigned level,
const char *name, const char *format, ...) {
_cleanup_free_ char *p = NULL;
va_list ap;
int r;
assert(dir);
assert(unit);
assert(name);
assert(format);
va_start(ap, format);
r = vasprintf(&p, format, ap);
va_end(ap);
if (r < 0)
return -ENOMEM;
return write_drop_in(dir, unit, level, name, p);
}
static int iterate_dir(
const char *path,
UnitDependency dependency,
dependency_consumer_t consumer,
void *arg,
char ***strv) {
_cleanup_closedir_ DIR *d = NULL;
int r;
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;
}
assert(consumer);
d = opendir(path);
if (!d) {
if (errno == ENOENT)
return 0;
return log_error_errno(errno, "Failed to open directory %s: %m", path);
}
for (;;) {
struct dirent *de;
_cleanup_free_ char *f = NULL;
errno = 0;
de = readdir(d);
if (!de && errno != 0)
return log_error_errno(errno, "Failed to read directory %s: %m", path);
if (!de)
break;
if (hidden_file(de->d_name))
continue;
f = strjoin(path, "/", de->d_name, NULL);
if (!f)
return log_oom();
r = consumer(dependency, de->d_name, f, arg);
if (r < 0)
return r;
}
return 0;
}
int unit_file_process_dir(
Set *unit_path_cache,
const char *unit_path,
const char *name,
const char *suffix,
UnitDependency dependency,
dependency_consumer_t consumer,
void *arg,
char ***strv) {
_cleanup_free_ char *path = NULL;
int r;
assert(unit_path);
assert(name);
assert(suffix);
path = strjoin(unit_path, "/", name, suffix, NULL);
if (!path)
return log_oom();
if (!unit_path_cache || set_get(unit_path_cache, path))
(void) iterate_dir(path, dependency, consumer, arg, strv);
if (unit_name_is_valid(name, UNIT_NAME_INSTANCE)) {
_cleanup_free_ char *template = NULL, *p = NULL;
/* Also try the template dir */
r = unit_name_template(name, &template);
if (r < 0)
return log_error_errno(r, "Failed to generate template from unit name: %m");
p = strjoin(unit_path, "/", template, suffix, NULL);
if (!p)
return log_oom();
if (!unit_path_cache || set_get(unit_path_cache, p))
(void) iterate_dir(p, dependency, consumer, arg, strv);
}
return 0;
}
int unit_file_find_dropin_paths(
char **lookup_path,
Set *unit_path_cache,
Set *names,
char ***paths) {
_cleanup_strv_free_ char **strv = NULL, **ans = NULL;
Iterator i;
char *t;
int r;
assert(paths);
SET_FOREACH(t, names, i) {
char **p;
STRV_FOREACH(p, lookup_path)
unit_file_process_dir(unit_path_cache, *p, t, ".d", _UNIT_DEPENDENCY_INVALID, NULL, NULL, &strv);
}
if (strv_isempty(strv))
return 0;
r = conf_files_list_strv(&ans, ".conf", NULL, (const char**) strv);
if (r < 0)
return log_warning_errno(r, "Failed to get list of configuration files: %m");
*paths = ans;
ans = NULL;
return 1;
}