diff --git a/doc/lxc.container.conf.sgml.in b/doc/lxc.container.conf.sgml.in
index 316327985..287bc8e51 100644
--- a/doc/lxc.container.conf.sgml.in
+++ b/doc/lxc.container.conf.sgml.in
@@ -1519,6 +1519,20 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+
+
+
+
+
+
+
+ A hook to be run in the host's namespace after the
+ container has been setup, and immediately before starting
+ the container init.
+
+
+
+
diff --git a/src/lxc/conf.c b/src/lxc/conf.c
index b6dfa915c..0b5a9e260 100644
--- a/src/lxc/conf.c
+++ b/src/lxc/conf.c
@@ -236,7 +236,8 @@ extern int memfd_create(const char *name, unsigned int flags);
char *lxchook_names[NUM_LXC_HOOKS] = {"pre-start", "pre-mount", "mount",
"autodev", "start", "stop",
- "post-stop", "clone", "destroy"};
+ "post-stop", "clone", "destroy",
+ "start-host"};
struct mount_opt {
char *name;
@@ -3285,6 +3286,8 @@ int run_lxc_hooks(const char *name, char *hook, struct lxc_conf *conf,
if (strcmp(hook, "pre-start") == 0)
which = LXCHOOK_PRESTART;
+ else if (strcmp(hook, "start-host") == 0)
+ which = LXCHOOK_START_HOST;
else if (strcmp(hook, "pre-mount") == 0)
which = LXCHOOK_PREMOUNT;
else if (strcmp(hook, "mount") == 0)
diff --git a/src/lxc/conf.h b/src/lxc/conf.h
index 946ae4a23..1bc02dc4f 100644
--- a/src/lxc/conf.h
+++ b/src/lxc/conf.h
@@ -228,6 +228,7 @@ enum lxchooks {
LXCHOOK_POSTSTOP,
LXCHOOK_CLONE,
LXCHOOK_DESTROY,
+ LXCHOOK_START_HOST,
NUM_LXC_HOOKS
};
diff --git a/src/lxc/confile.c b/src/lxc/confile.c
index ed83d5dc8..1beb9c7b4 100644
--- a/src/lxc/confile.c
+++ b/src/lxc/confile.c
@@ -155,6 +155,7 @@ static struct lxc_config_t config[] = {
{ "lxc.hook.destroy", false, set_config_hooks, get_config_hooks, clr_config_hooks, },
{ "lxc.hook.mount", false, set_config_hooks, get_config_hooks, clr_config_hooks, },
{ "lxc.hook.post-stop", false, set_config_hooks, get_config_hooks, clr_config_hooks, },
+ { "lxc.hook.start-host", false, set_config_hooks, get_config_hooks, clr_config_hooks, },
{ "lxc.hook.pre-start", false, set_config_hooks, get_config_hooks, clr_config_hooks, },
{ "lxc.hook.pre-mount", false, set_config_hooks, get_config_hooks, clr_config_hooks, },
{ "lxc.hook.start", false, set_config_hooks, get_config_hooks, clr_config_hooks, },
@@ -980,6 +981,8 @@ static int set_config_hooks(const char *key, const char *value,
if (strcmp(key + 9, "pre-start") == 0)
return add_hook(lxc_conf, LXCHOOK_PRESTART, copy);
+ else if (strcmp(key + 9, "start-host") == 0)
+ return add_hook(lxc_conf, LXCHOOK_START_HOST, copy);
else if (strcmp(key + 9, "pre-mount") == 0)
return add_hook(lxc_conf, LXCHOOK_PREMOUNT, copy);
else if (strcmp(key + 9, "autodev") == 0)
@@ -4445,6 +4448,7 @@ int lxc_list_subkeys(struct lxc_conf *conf, const char *key, char *retv,
strprint(retv, inlen, "post-stop\n");
strprint(retv, inlen, "pre-mount\n");
strprint(retv, inlen, "pre-start\n");
+ strprint(retv, inlen, "start-host\n");
strprint(retv, inlen, "start\n");
strprint(retv, inlen, "stop\n");
} else if (!strcmp(key, "lxc.cap")) {
diff --git a/src/lxc/start.c b/src/lxc/start.c
index b838e579d..d8460403e 100644
--- a/src/lxc/start.c
+++ b/src/lxc/start.c
@@ -1165,6 +1165,7 @@ static int lxc_spawn(struct lxc_handler *handler)
{
int i, flags, ret;
const char *name = handler->name;
+ char pidstr[20];
bool wants_to_map_ids;
int saved_ns_fd[LXC_NS_MAX];
struct lxc_list *id_map;
@@ -1355,13 +1356,23 @@ static int lxc_spawn(struct lxc_handler *handler)
cgroup_disconnect();
cgroups_connected = false;
+ snprintf(pidstr, 20, "%d", handler->pid);
+ if (setenv("LXC_PID", pidstr, 1))
+ SYSERROR("Failed to set environment variable: LXC_PID=%s.", pidstr);
+
+ /* Run any host-side start hooks */
+ if (run_lxc_hooks(name, "start-host", handler->conf, handler->lxcpath, NULL)) {
+ ERROR("Failed to run lxc.hook.start-host for container \"%s\".", name);
+ return -1;
+ }
+
/* Tell the child to complete its initialization and wait for it to exec
* or return an error. (The child will never return
- * LXC_SYNC_POST_CGROUP+1. It will either close the sync pipe, causing
+ * LXC_SYNC_READY_START+1. It will either close the sync pipe, causing
* lxc_sync_barrier_child to return success, or return a different
* value, causing us to error out).
*/
- if (lxc_sync_barrier_child(handler, LXC_SYNC_POST_CGROUP))
+ if (lxc_sync_barrier_child(handler, LXC_SYNC_READY_START))
return -1;
if (lxc_network_recv_name_and_ifindex_from_child(handler) < 0) {
diff --git a/src/lxc/sync.h b/src/lxc/sync.h
index 744db613e..5c0fb3431 100644
--- a/src/lxc/sync.h
+++ b/src/lxc/sync.h
@@ -32,7 +32,7 @@ enum {
LXC_SYNC_CGROUP,
LXC_SYNC_CGROUP_UNSHARE,
LXC_SYNC_CGROUP_LIMITS,
- LXC_SYNC_POST_CGROUP,
+ LXC_SYNC_READY_START,
LXC_SYNC_RESTART,
LXC_SYNC_POST_RESTART,
LXC_SYNC_ERROR = -1 /* Used to report errors from another process */