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

[Dan Watkins]

This is running in the Launchpad build farm, so I think this is a
yakkety chroot on a precise host.

I'm testing that option out now, thanks for the suggestion!

Interestingly, though, applying the patch that Ubuntu had against the
previous version to the latest version fixed this issue on powerpc (but
not armhf), so I do wonder if there's something more deeply broken going
on.  I'll investigate that further if this option doesn't do the trick.

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

Status in cloud-images:
  New
Status in e2fsprogs package in Ubuntu:
  New

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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