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[Scott Moser <ssmoser2+ubuntu@xxxxxxxxx>]

** Also affects: ssh-import-id (Ubuntu Xenial)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1570997

Title:
  fail if HOME environment variable is not set

Status in ssh-import-id:
  Fix Committed
Status in ssh-import-id package in Ubuntu:
  Fix Released
Status in ssh-import-id source package in Xenial:
  New

Bug description:
  === Begin SRU Template ===
  [Impact] 
  Running ssh-import-id without environment variable HOME set
  will fail and print an error message like:

   TypeError: join() argument must be str or bytes, not 'NoneType'

  [Test Case]
  $ name="my-x"
  $ ud=$(printf '%s\n%s\n' '#!/bin/sh' 'ssh-import-id smoser')
  $ lxc launch ubuntu-daily:xenial "$name" "--config=user.user-data=$ud"

  To see failure, you can then just:
  $ lxc exec "$name" -- cat /run/cloud-init/result.json
  {
   "v1": {
    "datasource": "DataSourceHetzner",
    "errors": [
     "('scripts-user', RuntimeError('Runparts: 1 failures in 1 attempted commands',))"
    ]
   }
  }

  $ lxc exec "$name" -- grep "ssh-import-id smoser" /root/.ssh/authorized_keys &&
      echo GOOD || echo FAIL

  [Regression Potential] 
  Regression is unlikely.  The code only does anything if HOME is not present.
  This has been in Artful and Bionic since 2016-09-16.

  [Other Info]
  Upstream merge proposal:
   https://code.launchpad.net/~smoser/ssh-import-id/trunk.lp1570997/+merge/326692

  === End SRU Template ===

  I've modified /usr/bin/ssh-import-id to show a stack trace rather than unhelpful message:
   TypeError: join() argument must be str or bytes, not 'NoneType'

  Then, running:
  $ env -u HOME ssh-import-id smoser
  Traceback (most recent call last):
    File "/usr/bin/ssh-import-id", line 62, in <module>
      main()
    File "/usr/bin/ssh-import-id", line 45, in main
      k = import_keys(proto, username, parser.options.useragent)
    File "/usr/lib/python3/dist-packages/ssh_import_id/__init__.py", line 204, in import_keys
      local_keys = key_list(read_keyfile())
    File "/usr/lib/python3/dist-packages/ssh_import_id/__init__.py", line 135, in read_keyfile
      output_file = parser.options.output or os.path.join(os.getenv("HOME"), ".ssh", "authorized_keys")
    File "/usr/lib/python3.5/posixpath.py", line 89, in join
      genericpath._check_arg_types('join', a, *p)
    File "/usr/lib/python3.5/genericpath.py", line 143, in _check_arg_types
      (funcname, s.__class__.__name__)) from None
  TypeError: join() argument must be str or bytes, not 'NoneType'

  I came to find this by trying to  launch an instance with:

  $ ec2metadata --user-data
  #!/bin/sh
  exec >/my.log 2>&1
  cat /proc/uptime
  date -R
  ssh-import-id smoser

  The basic issue is that the environment that cloud-init runs in does
  not have HOME set.

  I suggest using os.path.expanduser
  def authorized_key_file():
          return os.path.join(os.path.expanduser("~"), ".ssh", "authorized_keys")

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ssh-import-id 5.5-0ubuntu1 [modified: usr/bin/ssh-import-id]
  ProcVersionSignature: User Name 4.4.0-18.34-generic 4.4.6
  Uname: Linux 4.4.0-18-generic x86_64
  ApportVersion: 2.20.1-0ubuntu1
  Architecture: amd64
  Date: Fri Apr 15 17:36:09 2016
  Ec2AMI: ami-929f8cf8
  Ec2AMIManifest: ubuntu-us-east-1/images-testing/hvm-instance/ubuntu-xenial-daily-amd64-server-20160412.manifest.xml
  Ec2AvailabilityZone: us-east-1c
  Ec2InstanceType: m3.medium
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ssh-import-id
  UpgradeStatus: No upgrade log present (probably fresh install)

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