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Do not fail if /tmp does not exist

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Currently if /tmp does not exist, CRIU fails because it will not be
able to create a temporary directory there.  But when checkpointing
and restoring containers, we cannot rely on the existence of /tmp.
For such containers, we should use root (/).  The temporary directory
will be removed after CRIU is done.

Signed-off-by: Saied Kazemi <saied@google.com>
Acked-by: Andrew Vagin <avagin@odin.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Saied Kazemi
2015-04-06 19:22:00 +03:00
committed by Pavel Emelyanov
parent ad03d67a4b
commit f72f3824f4
1 changed files with 7 additions and 2 deletions
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9
mount.c
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@@ -774,7 +774,9 @@ int open_mount(unsigned int s_dev)
static int open_mountpoint(struct mount_info *pm)
{
int fd = -1, ns_old = -1;
char mnt_path[] = "/tmp/cr-tmpfs.XXXXXX";
char mnt_path_tmp[] = "/tmp/cr-tmpfs.XXXXXX";
char mnt_path_root[] = "/cr-tmpfs.XXXXXX";
char *mnt_path = mnt_path_tmp;
int cwd_fd;
/*
@@ -803,7 +805,10 @@ static int open_mountpoint(struct mount_info *pm)
if (switch_ns(root_item->pid.real, &mnt_ns_desc, &ns_old) < 0)
goto out;
if (mkdtemp(mnt_path) == NULL) {
mnt_path = mkdtemp(mnt_path_tmp);
if (mnt_path == NULL && errno == ENOENT)
mnt_path = mkdtemp(mnt_path_root);
if (mnt_path == NULL) {
pr_perror("Can't create a temporary directory");
goto out;
}