Comment 0 for bug 1370249

I was trying to deploy an image based on an Ubuntu Desktop install. I made a "curtin-compatible" tar.gz which includes cloud-init, put it in place of root-tgz in my maas server, and tried to deploy a node (using juju bootstrap).

Juju ended up complaining and timing out, and the node never fully completed installation. On closer look, I found curtin crashes when running "curthooks", specifically at some point it does dpkg --list. The code that handles this (utils.subp) assumes output from its commands is pure ascii and so crashes when the output contains non-ascii. For Ubuntu Desktop, in particular, the output contains "Déjȧ Dup", which is what causes things to barf.

I SSHd into the half-installed node and ran curtin manually like so:

sudo CURTIN_STACKTRACE=1 /curtin/bin/curtin --verbose --verbose --log-file /media/root-rw/curtin-install.log install --config=configs/config-000.cfg http://10.10.10.1/MAAS/static/images/ubuntu/amd64/generic/trusty/release/root-tgz

It ended in this:

Running command ['chroot', '/tmp/tmpQ_dk0_/target', 'dpkg-query', '--list'] with allowed return codes [0] (shell=False, capture=True)
Traceback (most recent call last):
  File "/curtin/curtin/commands/main.py", line 96, in main
    sys.exit(args.func(args))
  File "/curtin/curtin/commands/curthooks.py", line 443, in curthooks
    apply_debconf_selections(cfg, target)
  File "/curtin/curtin/commands/curthooks.py", line 219, in apply_debconf_selections
    pkgs_installed = get_installed_packages(target)
  File "/curtin/curtin/commands/curthooks.py", line 259, in get_installed_packages
    (out, _err) = util.subp(cmd, capture=True)
  File "/curtin/curtin/util.py", line 58, in subp
    out = out.decode()
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 19027: ordinal not in range(128)
'ascii' codec can't decode byte 0xc3 in position 19027: ordinal not in range(128)
Traceback (most recent call last):
  File "/curtin/curtin/commands/main.py", line 96, in main
    sys.exit(args.func(args))
  File "/curtin/curtin/commands/install.py", line 267, in cmd_install
    stage.run()
  File "/curtin/curtin/commands/install.py", line 104, in run
    util.subp(cmd, shell=shell, env=self.env)
  File "/curtin/curtin/util.py", line 68, in subp
    cmd=args)
ProcessExecutionError: Unexpected error while running command.
Command: ['curtin', 'curthooks']
Exit code: 3
Reason: -
Stdout: ''
Stderr: ''
Unexpected error while running command.
Command: ['curtin', 'curthooks']
Exit code: 3
Reason: -
Stdout: ''
Stderr: ''

I'm attaching the full log as well.