[PATCH] Add --root=<root> for enable/disable/is-enabled systemctl commands.
Frederic Crozat
fcrozat at suse.com
Fri Jun 24 06:02:02 PDT 2011
To be used for easily enable / disable systemd services for a chroot,
without running systemctl inside chroot.
---
man/systemctl.xml | 11 +++++++++
src/systemctl.c | 63 ++++++++++++++++++++++++++++++++++++++++++----------
2 files changed, 62 insertions(+), 12 deletions(-)
diff --git a/man/systemctl.xml b/man/systemctl.xml
index 2fd2b7b..a3e0a30 100644
--- a/man/systemctl.xml
+++ b/man/systemctl.xml
@@ -382,6 +382,17 @@
</varlistentry>
<varlistentry>
+ <term><option>--root=</option></term>
+
+ <listitem><para>When used with
+ <command>enable</command>/
+ <command>disable</command>/
+ <command>is-enabled</command>,
+ use alternative root path for systemd
+ install.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
<term><option>-H</option></term>
<term><option>--host</option></term>
diff --git a/src/systemctl.c b/src/systemctl.c
index ab41566..f6dca5b 100644
--- a/src/systemctl.c
+++ b/src/systemctl.c
@@ -80,6 +80,7 @@ static bool arg_failed = false;
static char **arg_wall = NULL;
static const char *arg_kill_who = NULL;
static const char *arg_kill_mode = NULL;
+static const char *arg_root = NULL;
static int arg_signal = SIGTERM;
static usec_t arg_when = 0;
static enum action {
@@ -3848,8 +3849,14 @@ static int remove_marked_symlinks(const char *config_path) {
return r;
}
-static int create_symlink(const char *verb, const char *old_path, const char *new_path) {
+static int create_symlink(const char *verb, const char *orig_old_path, const char *new_path) {
int r;
+ const char *old_path;
+
+ if (arg_root)
+ old_path = orig_old_path+strlen(arg_root);
+ else
+ old_path = orig_old_path;
assert(old_path);
assert(new_path);
@@ -4062,12 +4069,23 @@ static int install_info_apply(const char *verb, LookupPaths *paths, InstallInfo
STRV_FOREACH(p, paths->unit_path) {
int fd;
+ char *path, *should_free;
+
+ if (arg_root)
+ should_free = path = strappend(arg_root, *p);
+ else {
+ should_free = NULL;
+ path = *p;
+ }
- if (!(filename = path_make_absolute(i->name, *p))) {
+ if (!(filename = path_make_absolute(i->name, path))) {
log_error("Out of memory");
return -ENOMEM;
}
+ if (should_free)
+ free(should_free);
+
/* Ensure that we don't follow symlinks */
if ((fd = open(filename, O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NOCTTY)) >= 0)
if ((f = fdopen(fd, "re")))
@@ -4102,7 +4120,14 @@ static int install_info_apply(const char *verb, LookupPaths *paths, InstallInfo
}
sysv[strlen(sysv) - sizeof(".service") + 1] = 0;
- exists = access(sysv, F_OK) >= 0;
+ if (arg_root) {
+ char *tmp_path;
+
+ tmp_path = strappend (arg_root, sysv);
+ exists = access (tmp_path, F_OK) >= 0;
+ free (tmp_path);
+ } else
+ exists = access(sysv, F_OK) >= 0;
if (exists) {
pid_t pid;
@@ -4112,6 +4137,7 @@ static int install_info_apply(const char *verb, LookupPaths *paths, InstallInfo
"/sbin/chkconfig",
NULL,
NULL,
+ NULL,
NULL
};
@@ -4121,8 +4147,10 @@ static int install_info_apply(const char *verb, LookupPaths *paths, InstallInfo
argv[2] =
streq(verb, "enable") ? "on" :
streq(verb, "disable") ? "off" : "--level=5";
+ if (arg_root)
+ argv[3] = strappend("--root=", arg_root);
- log_info("Executing %s %s %s", argv[0], argv[1], strempty(argv[2]));
+ log_info("Executing %s %s %s %s", argv[0], argv[1], strempty(argv[2]), strempty(argv[3]));
if ((pid = fork()) < 0) {
log_error("Failed to fork: %m");
@@ -4199,20 +4227,24 @@ static int install_info_apply(const char *verb, LookupPaths *paths, InstallInfo
}
static char *get_config_path(void) {
+ char *ret;
if (arg_user && arg_global)
- return strdup(USER_CONFIG_UNIT_PATH);
+ ret = strdup(USER_CONFIG_UNIT_PATH);
if (arg_user) {
- char *p;
-
- if (user_config_home(&p) < 0)
+ if (user_config_home(&ret) < 0)
return NULL;
-
- return p;
}
- return strdup(SYSTEM_CONFIG_UNIT_PATH);
+ ret = strdup(SYSTEM_CONFIG_UNIT_PATH);
+ if (arg_root) {
+ char *p;
+ p = strappend (arg_root, ret);
+ free (ret);
+ return p;
+ } else
+ return ret;
}
static int enable_unit(DBusConnection *bus, char **args, unsigned n) {
@@ -4295,7 +4327,7 @@ static int enable_unit(DBusConnection *bus, char **args, unsigned n) {
/* Don't try to reload anything if we are called for system changes but the system wasn't booted with systemd */
(arg_user || sd_booted() > 0) &&
/* Don't try to reload anything if we are running in a chroot environment */
- (arg_user || running_in_chroot() <= 0) ) {
+ (arg_user || running_in_chroot() <= 0 || arg_root) ) {
int q;
if ((q = daemon_reload(bus, args, n)) < 0)
@@ -4347,6 +4379,7 @@ static int systemctl_help(void) {
" Do not ask for system passwords\n"
" --order When generating graph for dot, show only order\n"
" --require When generating graph for dot, show only requirement\n"
+ " --root=path Use <root> as the root file system\n"
" --system Connect to system manager\n"
" --user Connect to user service manager\n"
" --global Enable/disable unit files globally\n"
@@ -4481,6 +4514,7 @@ static int systemctl_parse_argv(int argc, char *argv[]) {
ARG_NO_WALL,
ARG_ORDER,
ARG_REQUIRE,
+ ARG_ROOT,
ARG_FULL,
ARG_NO_RELOAD,
ARG_DEFAULTS,
@@ -4509,6 +4543,7 @@ static int systemctl_parse_argv(int argc, char *argv[]) {
{ "quiet", no_argument, NULL, 'q' },
{ "order", no_argument, NULL, ARG_ORDER },
{ "require", no_argument, NULL, ARG_REQUIRE },
+ { "root", required_argument, NULL, ARG_ROOT },
{ "force", no_argument, NULL, 'f' },
{ "no-reload", no_argument, NULL, ARG_NO_RELOAD },
{ "defaults", no_argument, NULL, ARG_DEFAULTS },
@@ -4603,6 +4638,10 @@ static int systemctl_parse_argv(int argc, char *argv[]) {
arg_dot = DOT_REQUIRE;
break;
+ case ARG_ROOT:
+ arg_root = optarg;
+ break;
+
case ARG_FULL:
arg_full = true;
break;
--
1.7.3.4
--=-mqAF/uTG2Ik6UZwzUZk6--
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