[CRIU] [PATCH] mount: Add a detailed error message when opts.root is NULL

[Kondo, Uchio]

Signed-off-by: Uchio KONDO <udzura at udzura.jp>
---
 criu/mount.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/criu/mount.c b/criu/mount.c
index d95e6033..c7c06ea2 100644
--- a/criu/mount.c
+++ b/criu/mount.c
@@ -2476,6 +2476,11 @@ static int do_mount_one(struct mount_info *mi)
        pr_debug("\tMounting %s @%s (%d)\n", mi->fstype->name,
mi->mountpoint, mi->need_plugin);

        if (rst_mnt_is_root(mi)) {
+               if (opts.root == NULL) {
+                       pr_err("Option --root is required to restore
processes with pivot_root\n");
+                       return -1;
+               }
+
                /* do_mount_root() is called from populate_mnt_ns() */
                if (mount(opts.root, mi->mountpoint, NULL, MS_BIND |
MS_REC, NULL))
                        return -1;
-- 
2.17.0
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