[Bug 1588594] Re: mountall: potential problem with fuse.ceph

[Steve Langasek]

On Fri, Jun 03, 2016 at 04:50:15PM -0000, Francois Lafont wrote:
> Personally I'm not used to changing the init program of my distrib but
> indeed it's possible. So the problem can happen in Trusty and in Xenial
> too with the condition to switch to upstart in the Xenial case.

Running xenial with upstart is not a supported configuration; upstart is
supported in xenial only during the upgrade until the first reboot.

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Title:
  mountall: potential problem with fuse.ceph

Status in mountall package in Ubuntu:
  New

Bug description:
  Hi,

  Here is a perfectly valid fstab line to mount a fuse.ceph filesystem
  (it's a distributed file system but no importance here):

      id=cfs,keyring=/etc/ceph/keyring,client_mountpoint=/ /mnt/
  fuse.ceph defaults,_netdev   0   0

  But here are the arguments given to /sbin/mount.fuse.ceph by mountall:

      id=cfs,keyring=/etc/ceph/keyring,client_mountpoint= /mnt -o
  rw,_netdev

  As you can see, I have "client_mountpoint=" but it should be
  "client_mountpoint=/" (with the / at the end). The trailing "/" has
  been removed and in this case it's a bad idea. The mount at boot just
  fails because "client_mountpoint=" is not correct.

  In fact, the problem is in src/mountall.c around line 569:

      char *colon;
      dequote (mnt->device);
      /* If our device name is in host:/path format, as is
       * commonly used for network filesystems, don't strip
       * trailing slashes if this is the entire path.  We
       * look for the colon starting from the end, so that
       * we correctly handle IPv6 addresses for the host
       * part.
       */
      if ((colon = strrchr (mnt->device,':')) != NULL
          && colon[1] == '/')
          strip_slashes (colon + 2);
      else
          strip_slashes (mnt->device);  // <==== bad idea in the specific case of fuse.ceph filesystem

  
  It's Ubuntu Xenial with mountall version 2.54ubuntu1.

  Regards

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