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tmpfiles: add --root option to operate on an alternate fs tree

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This makes it possible to initialize or cleanup an arbitrary filesystem
hierarchy in the same way that it would be during system boot.
This commit is contained in:
Michael Marineau 2014-03-13 21:32:13 -07:00 committed by Zbigniew Jędrzejewski-Szmek
parent 4cf7ea556a
commit cf9a4abdc2
2 changed files with 34 additions and 5 deletions
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12
man/systemd-tmpfiles.xml
View File

@ -139,19 +139,27 @@
</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--prefix=PATH</option></term>
<term><option>--prefix=<replaceable>path</replaceable></option></term>
<listitem><para>Only apply rules that
apply to paths with the specified
prefix. This option can be specified
multiple times.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--exclude-prefix=PATH</option></term>
<term><option>--exclude-prefix=<replaceable>path</replaceable></option></term>
<listitem><para>Ignore rules that
apply to paths with the specified
prefix. This option can be specified
multiple times.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--root=<replaceable>root</replaceable></option></term>
<listitem><para>Takes a directory path
as an argument. All paths will be
prefixed with the given alternate <replaceable>root</replaceable>
path, including config search paths.
</para></listitem>
</varlistentry>
<xi:include href="standard-options.xml" xpointer="help" />
<xi:include href="standard-options.xml" xpointer="version" />

27
src/tmpfiles/tmpfiles.c
View File

@ -111,6 +111,7 @@ static bool arg_boot = false;
static char **include_prefixes = NULL;
static char **exclude_prefixes = NULL;
static char *arg_root = NULL;
static const char conf_file_dirs[] =
"/etc/tmpfiles.d\0"
@ -1188,6 +1189,15 @@ static int parse_line(const char *fname, unsigned line, const char *buffer) {
if (!should_include_path(i->path))
return 0;
if (arg_root) {
char *p = strappend(arg_root, i->path);
if (!p)
return log_oom();
free(i->path);
i->path = p;
}
if (user && !streq(user, "-")) {
const char *u = user;
@ -1277,7 +1287,8 @@ static int help(void) {
" --remove Remove marked files/directories\n"
" --boot Execute actions only safe at boot\n"
" --prefix=PATH Only apply rules that apply to paths with the specified prefix\n"
" --exclude-prefix=PATH Ignore rules that apply to paths with the specified prefix\n",
" --exclude-prefix=PATH Ignore rules that apply to paths with the specified prefix\n"
" --root=PATH Operate on an alternate filesystem root\n",
program_invocation_short_name);
return 0;
@ -1293,6 +1304,7 @@ static int parse_argv(int argc, char *argv[]) {
ARG_BOOT,
ARG_PREFIX,
ARG_EXCLUDE_PREFIX,
ARG_ROOT,
};
static const struct option options[] = {
@ -1304,6 +1316,7 @@ static int parse_argv(int argc, char *argv[]) {
{ "boot", no_argument, NULL, ARG_BOOT },
{ "prefix", required_argument, NULL, ARG_PREFIX },
{ "exclude-prefix", required_argument, NULL, ARG_EXCLUDE_PREFIX },
{ "root", required_argument, NULL, ARG_ROOT },
{}
};
@ -1350,6 +1363,13 @@ static int parse_argv(int argc, char *argv[]) {
return log_oom();
break;
case ARG_ROOT:
arg_root = path_make_absolute_cwd(optarg);
if (!arg_root)
return log_oom();
path_kill_slashes(arg_root);
break;
case '?':
return -EINVAL;
@ -1376,7 +1396,7 @@ static int read_config_file(const char *fn, bool ignore_enoent) {
assert(fn);
r = search_and_fopen_nulstr(fn, "re", NULL, conf_file_dirs, &f);
r = search_and_fopen_nulstr(fn, "re", arg_root, conf_file_dirs, &f);
if (r < 0) {
if (ignore_enoent && r == -ENOENT)
return 0;
@ -1477,7 +1497,7 @@ int main(int argc, char *argv[]) {
_cleanup_strv_free_ char **files = NULL;
char **f;
r = conf_files_list_nulstr(&files, ".conf", NULL, conf_file_dirs);
r = conf_files_list_nulstr(&files, ".conf", arg_root, conf_file_dirs);
if (r < 0) {
log_error("Failed to enumerate tmpfiles.d files: %s", strerror(-r));
goto finish;
@ -1508,6 +1528,7 @@ finish:
free(include_prefixes);
free(exclude_prefixes);
free(arg_root);
set_free_free(unix_sockets);