[systemd-bugs] [Bug 53205] New: mount should support bind mount with new options

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=53205

             Bug #: 53205
           Summary: mount should support bind mount with new options
    Classification: Unclassified
           Product: systemd
           Version: unspecified
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: general
        AssignedTo: systemd-bugs at lists.freedesktop.org
        ReportedBy: ezyang at mit.edu
         QAContact: systemd-bugs at lists.freedesktop.org


systemd doesn't really understand how to do bind mounts with new options. Right
now, we can do:

[Mount]
What=/var/lib/mock
Where=/var/lib/mock
Type=none
Options=bind,nosuid

But this translates into:

mount /var/lib/mock /var/lib/mock -t none -o bind,nosuid

rather than the correct sequence:

mount /var/lib/mock /var/lib/mock -o bind
mount -o remount,nosuid /var/lib/mock

since mount doesn't support bind-mounting plus extra options (this is
documented in the manpage). It would be nice if systemd could apply some magic
here and make it work.

(Note you can't even make two mounts, because systemd's naming convention means
only one unit file can be specified per mountpoint.)

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