Ubuntu – Multiple logins with pam_mount means multiple (redundant) mounts

cifspamUbuntuunix

I've configured pam_mount.so to automagically mount a cifs share when users login; the problem is if a user logs into multiple times simultaneously, the mount command is repeated multiple times.

This so far isn't a problem but it's messy when you look at the output of a mount command.

# mount
/dev/sda1 on / type ext4 (rw,errors=remount-ro)
proc on /proc type proc (rw,noexec,nosuid,nodev)
none on /sys type sysfs (rw,noexec,nosuid,nodev)
none on /sys/fs/fuse/connections type fusectl (rw)
none on /sys/kernel/debug type debugfs (rw)
none on /sys/kernel/security type securityfs (rw)
none on /dev type devtmpfs (rw,mode=0755)
none on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620)
none on /dev/shm type tmpfs (rw,nosuid,nodev)
none on /var/run type tmpfs (rw,nosuid,mode=0755)
none on /var/lock type tmpfs (rw,noexec,nosuid,nodev)
none on /lib/init/rw type tmpfs (rw,nosuid,mode=0755)
//srv1/UserShares/jrisk on /home/jrisk type cifs (rw,mand)
//srv1/UserShares/jrisk on /home/jrisk type cifs (rw,mand)
//srv1/UserShares/jrisk on /home/jrisk type cifs (rw,mand)

I'm assuming I need to fiddle with either the pam.d/common-auth file or pam_mount.conf.xml to accomplish this.

How can I instruct pam_mount.so to avoid duplicate mountings?

[Edit]

The contents of my pam_mount.conf.xml file:

<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE pam_mount SYSTEM "pam_mount.conf.xml.dtd">
<pam_mount>
  <debug enable="1" />
  <volume user="*" server="srv1" path="UserShares" mountpoint="home" fstype="cifs" />
  <cifsmount>mount -t cifs //%(SERVER)/%(VOLUME)/%(USER) %(MNTPT)/%(USER) -o "user=%(USER),uid=%(USERUID),gid=%(USERGID)%(before=\",\" OPTIONS)"</cifsmount>
  <umount>umount %(MNTPT)/%(USER)</umount>
  <mntoptions allow="nosuid,nodev,loop,encryption,fsck,nonempty,allow_root,allow_other" />
  <mntoptions require="nosuid,nodev" />
  <path>/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin</path>
  <logout wait="0" hup="0" term="0" kill="0" />
  <mkmountpoint enable="1" remove="true" />
</pam_mount>

Best Answer

Why not use autofs?

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