[Bug 8566] New: umount: add support for the -O option

bugzilla at busybox.net bugzilla at busybox.net
Wed Dec 23 20:08:33 UTC 2015


https://bugs.busybox.net/show_bug.cgi?id=8566

            Bug ID: 8566
           Summary: umount: add support for the -O option
           Product: Busybox
           Version: 1.24.x
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Other
          Assignee: unassigned at busybox.net
          Reporter: austinenglish at gmail.com
                CC: busybox-cvs at busybox.net

austin at austin1:~$ busybox umount -O
umount: invalid option -- 'O'
BusyBox v1.24.1 (2015-12-08 17:41:42 CST) multi-call binary.

Usage: umount [OPTIONS] FILESYSTEM|DIRECTORY

Unmount file systems

    -a    Unmount all file systems in /etc/mtab
    -n    Don't erase /etc/mtab entries
    -r    Try to remount devices as read-only if mount is busy
    -l    Lazy umount (detach filesystem)
    -f    Force umount (i.e., unreachable NFS server)
    -D    Don't free loop device even if it has been used

note that mount supports -O, already:
austin at austin1:~$ busybox mount -O
mount: option requires an argument -- 'O'
BusyBox v1.24.1 (2015-12-08 17:41:42 CST) multi-call binary.

This is needed by OpenRC:
OpenRC uses "umount -O _netdev" in the netmount script as part of the
process to unmount all network file systems on Linux.
However, the busybox umount command does not support -O.
If it did, I believe we could just use this command to unmount *all*
network file systems on Linux and not worry about fs types.

See https://bugs.gentoo.org/show_bug.cgi?id=468604

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