[Bug 1598136] Re: Fails to produce a loop-mountable FS on powerpc/armhf

[Dan Watkins]

** Changed in: cloud-images
    Milestone: y-2016-08-11 => y-2016-08-25

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https://bugs.launchpad.net/bugs/1598136

Title:
  Fails to produce a loop-mountable FS on powerpc/armhf

Status in cloud-images:
  In Progress
Status in e2fsprogs package in Ubuntu:
  Invalid

Bug description:
  In yakkety cloud image builds for each of powerpc and armhf (but not
  amd64, i386, ppc64el, arm64 or s390x) we see the following failure:

  [2016-07-01 09:51:08] lb_binary_chroot
  P: Begin copying chroot...
  [2016-07-01 09:51:08] lb_binary_rootfs
  P: Begin building root filesystem image...
  0+0 records in
  0+0 records out
  0 bytes copied, 3.7116e-05 s, 0.0 kB/s
  mke2fs 1.43.1 (08-Jun-2016)
  ext2fs_check_if_mount: Can't check if filesystem is mounted due to missing mtab file while determining whether binary/boot/filesystem.ext4 is mounted.
  Suggestion: Use Linux kernel >= 3.18 for improved stability of the metadata and journal checksum features.
  Discarding device blocks:   4096/343040             done
  Creating filesystem with 343040 4k blocks and 171600 inodes
  Filesystem UUID: 43ff7fc9-12bb-4151-8549-77c8e1e35e2c
  Superblock backups stored on blocks:
   32768, 98304, 163840, 229376, 294912

  Allocating group tables:  0/11     done
  Writing inode tables:  0/11     done
  Creating journal (8192 blocks): done
  Writing superblocks and filesystem accounting information:  0/11     done

  mount: wrong fs type, bad option, bad superblock on /dev/loop0,
         missing codepage or helper program, or other error

         In some cases useful info is found in syslog - try
         dmesg | tail or so.

  This is caused by this code in live-build's lb_binary_rootfs script:

  dd if=/dev/zero of=binary/${INITFS}/filesystem.${LB_CHROOT_FILESYSTEM} bs=1024k count=0 seek=${REAL_DIM}
  mkfs.${LB_CHROOT_FILESYSTEM} -F -b ${LB_EXT_BLOCKSIZE:-1024} -i 8192 -m 0 -L ${LB_HDD_LABEL} ${LB_EXT_RESIZEBLOCKS:+-E resize=${LB_EXT_RESIZEBLOCKS}} binary/${INITFS}/filesystem.${LB_CHROOT_FILESYSTEM}

  mkdir -p filesystem.tmp
  ${LB_ROOT_COMMAND} mount -o loop binary/${INITFS}/filesystem.${LB_CHROOT_FILESYSTEM} filesystem.tmp

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