[CRIU] [PATCH vv 3/3] cr-restore: set NS_PID environment variable before "post-resume" hook

[Stanislav Kinsburskiy]

The only one (so far) "post-resume" script needs some pid to join its
namespaces. Let it be containers root.

Signed-off-by: Stanislav Kinsburskiy <skinsbursky at virtuozzo.com>
---
 criu/cr-restore.c |    8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/criu/cr-restore.c b/criu/cr-restore.c
index 10e8097..382c0a7 100644
--- a/criu/cr-restore.c
+++ b/criu/cr-restore.c
@@ -1995,6 +1995,7 @@ static int restore_root_task(struct pstree_item *init)
 	enum trace_flags flag = TRACE_ALL;
 	int ret, fd, mnt_ns_fd = -1;
 	int clean_remaps = 1;
+	char root_item_pid[16];
 
 	ret = run_scripts(ACT_PRE_RESTORE);
 	if (ret != 0) {
@@ -2195,6 +2196,13 @@ static int restore_root_task(struct pstree_item *init)
 
 	write_stats(RESTORE_STATS);
 
+	snprintf(root_item_pid, sizeof(root_item_pid), "%d", root_item->pid.real);
+
+	if (setenv("NS_PID", root_item_pid, 1)) {
+		pr_perror("Can't set NS_PID=%s", root_item_pid);
+		return -1;
+	}
+
 	ret = run_scripts(ACT_POST_RESUME);
 	if (ret != 0)
 		pr_err("Post-resume script ret code %d\n", ret);