058db92528
Just as a matter of coding style: whenever we return successfully, let's make sure all our return parameters are properly initialized to something.
215 lines
5.6 KiB
C
215 lines
5.6 KiB
C
/***
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This file is part of systemd.
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Copyright 2014 Zbigniew Jędrzejewski-Szmek
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "alloc-util.h"
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#include "conf-files.h"
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#include "dirent-util.h"
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#include "dropin.h"
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#include "escape.h"
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#include "fd-util.h"
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#include "fileio-label.h"
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#include "fs-util.h"
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#include "hashmap.h"
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#include "log.h"
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#include "macro.h"
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#include "mkdir.h"
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#include "path-util.h"
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#include "set.h"
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#include "string-util.h"
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#include "strv.h"
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#include "unit-name.h"
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int drop_in_file(const char *dir, const char *unit, unsigned level,
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const char *name, char **_p, char **_q) {
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char prefix[DECIMAL_STR_MAX(unsigned)];
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_cleanup_free_ char *b = NULL;
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char *p, *q;
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assert(unit);
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assert(name);
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assert(_p);
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assert(_q);
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sprintf(prefix, "%u", level);
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b = xescape(name, "/.");
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if (!b)
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return -ENOMEM;
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if (!filename_is_valid(b))
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return -EINVAL;
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p = strjoin(dir, "/", unit, ".d");
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if (!p)
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return -ENOMEM;
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q = strjoin(p, "/", prefix, "-", b, ".conf");
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if (!q) {
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free(p);
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return -ENOMEM;
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}
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*_p = p;
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*_q = q;
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return 0;
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}
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int write_drop_in(const char *dir, const char *unit, unsigned level,
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const char *name, const char *data) {
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_cleanup_free_ char *p = NULL, *q = NULL;
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int r;
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assert(dir);
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assert(unit);
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assert(name);
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assert(data);
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r = drop_in_file(dir, unit, level, name, &p, &q);
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if (r < 0)
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return r;
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(void) mkdir_p(p, 0755);
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return write_string_file_atomic_label(q, data);
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}
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int write_drop_in_format(const char *dir, const char *unit, unsigned level,
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const char *name, const char *format, ...) {
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_cleanup_free_ char *p = NULL;
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va_list ap;
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int r;
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assert(dir);
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assert(unit);
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assert(name);
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assert(format);
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va_start(ap, format);
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r = vasprintf(&p, format, ap);
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va_end(ap);
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if (r < 0)
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return -ENOMEM;
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return write_drop_in(dir, unit, level, name, p);
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}
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static int unit_file_find_dir(
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const char *original_root,
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const char *path,
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char ***dirs) {
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_cleanup_free_ char *chased = NULL;
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int r;
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assert(path);
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r = chase_symlinks(path, original_root, 0, &chased);
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if (r == -ENOENT) /* Ignore -ENOENT, after all most units won't have a drop-in dir */
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return 0;
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if (r < 0)
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return log_full_errno(LOG_WARNING, r, "Failed to canonicalize path %s: %m", path);
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r = strv_push(dirs, chased);
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if (r < 0)
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return log_oom();
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chased = NULL;
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return 0;
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}
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static int unit_file_find_dirs(
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const char *original_root,
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Set *unit_path_cache,
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const char *unit_path,
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const char *name,
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const char *suffix,
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char ***dirs) {
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char *path;
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int r;
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assert(unit_path);
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assert(name);
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assert(suffix);
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path = strjoina(unit_path, "/", name, suffix);
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if (!unit_path_cache || set_get(unit_path_cache, path)) {
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r = unit_file_find_dir(original_root, path, dirs);
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if (r < 0)
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return r;
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}
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if (unit_name_is_valid(name, UNIT_NAME_INSTANCE)) {
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/* Also try the template dir */
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_cleanup_free_ char *template = NULL;
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r = unit_name_template(name, &template);
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if (r < 0)
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return log_error_errno(r, "Failed to generate template from unit name: %m");
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return unit_file_find_dirs(original_root, unit_path_cache, unit_path, template, suffix, dirs);
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}
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return 0;
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}
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int unit_file_find_dropin_paths(
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const char *original_root,
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char **lookup_path,
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Set *unit_path_cache,
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const char *dir_suffix,
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const char *file_suffix,
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Set *names,
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char ***ret) {
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_cleanup_strv_free_ char **dirs = NULL, **ans = NULL;
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Iterator i;
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char *t, **p;
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int r;
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assert(ret);
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SET_FOREACH(t, names, i)
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STRV_FOREACH(p, lookup_path)
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unit_file_find_dirs(original_root, unit_path_cache, *p, t, dir_suffix, &dirs);
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if (strv_isempty(dirs)) {
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*ret = NULL;
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return 0;
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}
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r = conf_files_list_strv(&ans, file_suffix, NULL, (const char**) dirs);
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if (r < 0)
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return log_warning_errno(r, "Failed to sort the list of configuration files: %m");
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*ret = ans;
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ans = NULL;
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return 1;
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}
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