[Bug 1745186] [NEW] tune2fs doesn't set UUID on a loopback device after mount/unmount

[Slava Abramov]

Public bug reported:

Below is the script we're running.  tune2fs doesn't set UUID (can be
checked with blkid) and exits abnormally (so that commands after tune2fs
call are not getting executed).

If we move tune2fs call above the mount command, everything works fine.
Also, it works fine everywhere else including Ubuntu 16.04.3.

#!/bin/bash
set -e
FOREMAN_SIZE=100
UUID="7b48ec41-a9fc-4937-b368-dfeae01c49f7"
MNT=$(mktemp -d -t mnt.XXXXXXXXXX)
trap "[[ -z "$MNT" ]] || rm -rf $MNT ||:" 0 1 2 3 15
if [[ -f foreman.tar.xz ]] && [[ ! -f foreman.img ]]; then
        echo "Creating \"foreman\" home image ..."
        qemu-img create -f raw -o size=${FOREMAN_SIZE}G foreman.img
        lo=$(sudo losetup --show -f foreman.img)
        echo -e "n\np\n\n\n\nw" | sudo fdisk $lo ||:
        sudo kpartx -asv $lo
        sudo mkfs.ext4 /dev/mapper/${lo##*/}p1
        sudo mount /dev/mapper/${lo##*/}p1 $MNT
        sudo tar -C $MNT -Jxvf foreman.tar.xz
        sudo umount $MNT
        sudo tune2fs /dev/mapper/${lo##*/}p1 -U $UUID
        sudo kpartx -d $lo
        sudo losetup -d $lo
fi

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: e2fsprogs 1.43.5-1
ProcVersionSignature: Ubuntu 4.13.0-31.34-generic 4.13.13
Uname: Linux 4.13.0-31-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.7
Architecture: amd64
CurrentDesktop: XFCE
Date: Wed Jan 24 12:02:26 2018
InstallationDate: Installed on 2018-01-10 (14 days ago)
InstallationMedia: Xubuntu 17.10 "Artful Aardvark" - Release amd64 (20171017.1)
SourcePackage: e2fsprogs
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: e2fsprogs (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug artful

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https://bugs.launchpad.net/bugs/1745186

Title:
  tune2fs doesn't set UUID on a loopback device after mount/unmount

Status in e2fsprogs package in Ubuntu:
  New

Bug description:
  Below is the script we're running.  tune2fs doesn't set UUID (can be
  checked with blkid) and exits abnormally (so that commands after
  tune2fs call are not getting executed).

  If we move tune2fs call above the mount command, everything works
  fine.  Also, it works fine everywhere else including Ubuntu 16.04.3.

  #!/bin/bash
  set -e
  FOREMAN_SIZE=100
  UUID="7b48ec41-a9fc-4937-b368-dfeae01c49f7"
  MNT=$(mktemp -d -t mnt.XXXXXXXXXX)
  trap "[[ -z "$MNT" ]] || rm -rf $MNT ||:" 0 1 2 3 15
  if [[ -f foreman.tar.xz ]] && [[ ! -f foreman.img ]]; then
          echo "Creating \"foreman\" home image ..."
          qemu-img create -f raw -o size=${FOREMAN_SIZE}G foreman.img
          lo=$(sudo losetup --show -f foreman.img)
          echo -e "n\np\n\n\n\nw" | sudo fdisk $lo ||:
          sudo kpartx -asv $lo
          sudo mkfs.ext4 /dev/mapper/${lo##*/}p1
          sudo mount /dev/mapper/${lo##*/}p1 $MNT
          sudo tar -C $MNT -Jxvf foreman.tar.xz
          sudo umount $MNT
          sudo tune2fs /dev/mapper/${lo##*/}p1 -U $UUID
          sudo kpartx -d $lo
          sudo losetup -d $lo
  fi

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: e2fsprogs 1.43.5-1
  ProcVersionSignature: Ubuntu 4.13.0-31.34-generic 4.13.13
  Uname: Linux 4.13.0-31-generic x86_64
  ApportVersion: 2.20.7-0ubuntu3.7
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Wed Jan 24 12:02:26 2018
  InstallationDate: Installed on 2018-01-10 (14 days ago)
  InstallationMedia: Xubuntu 17.10 "Artful Aardvark" - Release amd64 (20171017.1)
  SourcePackage: e2fsprogs
  UpgradeStatus: No upgrade log present (probably fresh install)

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