[Bug 1736556] Re: mount can exit 0 (success) when it fails

[Scott Moser]

** Summary changed:

- mount can exit (success) when it fails
+ mount can exit 0 (success) when it fails

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https://bugs.launchpad.net/bugs/1736556

Title:
  mount can exit 0 (success) when it fails

Status in util-linux package in Ubuntu:
  Confirmed

Bug description:
  I'm on softlayer in an official Ubuntu image and 'mount' exits 
  success even when it fails.

  $ cat /etc/cloud/build.info 
  build_name: server
  serial: 20171116

  $ cat /etc/fstab 
  LABEL=cloudimg-rootfs   /        ext4   defaults,relatime       0 0

  # Added by Cloud Image build process
  LABEL=cloudimg-bootfs   /boot   ext3    defaults,relatime    0 0
  # CLOUD_IMG: This file was created/modified by the Cloud Image build process
  # Mount the metadata disk for cloud-init, if present
  LABEL=METADATA /var/lib/cloud/seed/config_drive vfat defaults,nofail 0 0
  LABEL=SWAP-xvdb1        none    swap    sw,comment=cloudconfig  0       2

  $ blkid 
  /dev/xvda1: LABEL="cloudimg-bootfs" UUID="63ea63a7-f64c-493c-90d4-384adc196be9" TYPE="ext3" PARTUUID="3276fc6f-01"
  /dev/xvda2: LABEL="cloudimg-rootfs" UUID="82ca1e17-8bc2-4895-96bb-3c39e5863238" TYPE="ext4" PARTUUID="3276fc6f-02"
  /dev/xvdh: SEC_TYPE="msdos" LABEL="config-2" UUID="9796-932E" TYPE="vfat"
  /dev/xvdb1: LABEL="SWAP-xvdb1" UUID="d51fcca0-6b10-4934-a572-f3898dfd8840" TYPE="swap" PARTUUID="00025cdb-01"

  $ whoami
  root
  $ grep /var/lib/cloud/seed/config_drive /proc/mounts 
  $ mount /var/lib/cloud/seed/config_drive
  $ echo $?
  0

  ## it exited 0 so it should be mounted, but it is not.
  $ ls /var/lib/cloud/seed/config_drive
  $ grep /var/lib/cloud/seed/config_drive /proc/mounts

  
  ## try somewhere else and with /dev/ path. it works.
  $ mount /dev/xvdh /mnt
  $ echo $?
  0
  $ grep /mnt /proc/mounts 
  /dev/xvdh /mnt vfat rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro 0 0
  $ find /mnt/
  /mnt/
  /mnt/openstack
  /mnt/openstack/latest
  /mnt/openstack/latest/meta_data.json
  /mnt/openstack/latest/network_data.json
  /mnt/openstack/latest/user_data
  /mnt/openstack/latest/vendor_data.json

  $ journalctl -o short-monotonic --boot --no-pager | pastebinit
  http://paste.ubuntu.com/26119983/

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: mount 2.27.1-6ubuntu3.3
  ProcVersionSignature: Ubuntu 4.4.0-98.121-generic 4.4.90
  Uname: Linux 4.4.0-98-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.12
  Architecture: amd64
  Date: Tue Dec  5 17:52:14 2017
  ProcEnviron:
   TERM=screen
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: util-linux
  UpgradeStatus: No upgrade log present (probably fresh install)

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