[git commit] mkfs_vfat: do not generate same volume_id when run in rapid succession

[Denys Vlasenko]

commit: https://git.busybox.net/busybox/commit/?id=611729eff386234b09d40780cdcc21fe72f6f8b8
branch: https://git.busybox.net/busybox/commit/?id=refs/heads/master

function                                             old     new   delta
mkfs_vfat_main                                      1502    1523     +21

Signed-off-by: Denys Vlasenko <vda.linux at googlemail.com>
---
 util-linux/mkfs_vfat.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/util-linux/mkfs_vfat.c b/util-linux/mkfs_vfat.c
index 821371953..d2db78e1d 100644
--- a/util-linux/mkfs_vfat.c
+++ b/util-linux/mkfs_vfat.c
@@ -267,8 +267,9 @@ int mkfs_vfat_main(int argc UNUSED_PARAM, char **argv)
 
 	// cache device name
 	device_name = argv[0];
-	// default volume ID = creation time
-	volume_id = time(NULL);
+	// default volume ID: somewhat random (not crypto-strong)
+	// (mix in pid to avoid same IDs when run in rapid succession)
+	volume_id = time(NULL) ^ getpid();
 	// truncate to exactly 11 chars, pad with spaces
 	sprintf(volume_label11, "%-11.11s", arg_volume_label);