mount doesn't understand the auto mount option

Chris Boot bootc at debian.org
Tue Jul 23 17:13:00 UTC 2019


Package: busybox
Version: 1.30.1

We've received a bug in Debian about busybox's mount command not
supporting the 'auto' option in fstab. This option really is a no-op as
it is default behaviour that can be disabled with noauto, but it turns
out that some users add this to their fstab. With util-linux's mount
this works fine, but busybox mount croaks.

If a user has a separate /usr filesystem, this is mounted in the
initramfs after the root filesystem. When a user has a separate /usr
with the auto mount option set, the filesystem fails to mount and the
user gets dumped into the initramfs shell.

The patch below appears to fix the problem:

--- a/util-linux/mount.c
+++ b/util-linux/mount.c
@@ -298,6 +298,7 @@
 		/* "defaults" */ 0,
 		/* "quiet" 0 - do not filter out, vfat wants to see it */
 		/* "noauto" */ MOUNT_NOAUTO,
+		/* "auto" */ ~MOUNT_NOAUTO,
 		/* "sw"     */ MOUNT_SWAP,
 		/* "swap"   */ MOUNT_SWAP,
 		IF_DESKTOP(/* "user"  */ MOUNT_USERS,)
@@ -358,6 +359,7 @@
 		"defaults\0"
 		// "quiet\0" - do not filter out, vfat wants to see it
 		"noauto\0"
+		"auto\0"
 		"sw\0"
 		"swap\0"
 		IF_DESKTOP("user\0")

For reference, the Debian bug is:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=847424

Cheers,
Chris

-- 
Chris Boot
bootc at debian.org


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