Confusing 'success' message when apply_net fails.

Bug #1615780 reported by Jon Grimm
This bug affects 1 person
Affects Status Importance Assigned to Milestone
curtin (Ubuntu)

Bug Description


 * Curtin produced a configusing 'success' message when failying to apply
   a provided network configuration.

   Curtin has been updated to ensure that if 'apply_net' commands fail
   the return code is propagated up to the invocation and no longer
   prints both a success and failure message when a failure occurs.

[Test Case]

 * Install proposed curtin package and run the command
   - # curtin apply_net -t target -c bad.yaml

  PASS: Curtin does not emit successful message:
        'Applied network configuration successfully'

  FAIL: Curtin emits both
        'Applied network configuration successfully' and
        'failed to apply network config'

[Regression Potential]

 * Users of apply_net cli command may have examined the output of the
   command which is now modified, as well as the return code.

[Original Description]

When apply_net fails, the user both a fail message and a success message.. a bit confusing.

root@x1:~# curtin apply_net -t target -c bad.yaml
Applying network configuration
failed to apply network config
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/curtin/commands/", line 78, in apply_net_main
  File "/usr/lib/python3/dist-packages/curtin/commands/", line 44, in apply_net
    ns = net.parse_net_config(network_config)
  File "/usr/lib/python3/dist-packages/curtin/net/", line 283, in parse_net_config
    net_config = config.load_config(path)
  File "/usr/lib/python3/dist-packages/curtin/", line 117, in load_config
    return yaml.safe_load(content)
  File "/usr/lib/python3/dist-packages/yaml/", line 94, in safe_load
    return load(stream, SafeLoader)
  File "/usr/lib/python3/dist-packages/yaml/", line 72, in load
    return loader.get_single_data()
  File "/usr/lib/python3/dist-packages/yaml/", line 35, in get_single_data
    node = self.get_single_node()
  File "/usr/lib/python3/dist-packages/yaml/", line 36, in get_single_node
    document = self.compose_document()
  File "/usr/lib/python3/dist-packages/yaml/", line 55, in compose_document
    node = self.compose_node(None, None)
  File "/usr/lib/python3/dist-packages/yaml/", line 84, in compose_node
    node = self.compose_mapping_node(anchor)
  File "/usr/lib/python3/dist-packages/yaml/", line 133, in compose_mapping_node
    item_value = self.compose_node(node, item_key)
  File "/usr/lib/python3/dist-packages/yaml/", line 84, in compose_node
    node = self.compose_mapping_node(anchor)
  File "/usr/lib/python3/dist-packages/yaml/", line 127, in compose_mapping_node
    while not self.check_event(MappingEndEvent):
  File "/usr/lib/python3/dist-packages/yaml/", line 98, in check_event
    self.current_event = self.state()
  File "/usr/lib/python3/dist-packages/yaml/", line 428, in parse_block_mapping_key
    if self.check_token(KeyToken):
  File "/usr/lib/python3/dist-packages/yaml/", line 116, in check_token
  File "/usr/lib/python3/dist-packages/yaml/", line 257, in fetch_more_tokens
yaml.scanner.ScannerError: while scanning for the next token
found character '\t' that cannot start any token
  in "<unicode string>", line 4, column 5:
Applied network configuration successfully

Note the emitting of messages

"failed to apply network config"
"Applied network configuration successfully"

Really a minor issue.

Related branches

Ryan Harper (raharper)
Changed in curtin:
importance: Undecided → Low
status: New → In Progress
Ryan Harper (raharper)
description: updated
Revision history for this message
Andy Whitcroft (apw) wrote : Please test proposed package

Hello Jon, or anyone else affected,

Accepted curtin into xenial-proposed. The package will build now and be available at in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See for documentation how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, and change the tag from verification-needed to verification-done. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed. In either case, details of your testing will help us make a better decision.

Further information regarding the verification process can be found at . Thank you in advance!

tags: added: verification-needed
Andy Whitcroft (apw)
Changed in curtin (Ubuntu):
status: New → Fix Released
Changed in curtin (Ubuntu Xenial):
status: New → Fix Committed
Revision history for this message
Jon Grimm (jgrimm) wrote :

Verified fixed.

tags: added: verification-done
removed: verification-needed
Revision history for this message
Jon Grimm (jgrimm) wrote :

Verified curtin 0.1.0~bzr425-0ubuntu1~16.04.1 out of xenial-proposed.

Jon Grimm (jgrimm)
Changed in curtin:
status: In Progress → Fix Committed
Revision history for this message
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package curtin - 0.1.0~bzr425-0ubuntu1~16.04.1

curtin (0.1.0~bzr425-0ubuntu1~16.04.1) xenial-proposed; urgency=medium

  [ Scott Moser ]
  * debian/new-upstream-snapshot: add writing of debian changelog entries.

  [ Ryan Harper ]
  * New upstream snapshot.
    - unittest,tox.ini: catch and fix issue with trusty-level mock of open
    - block/mdadm: add option to ignore mdadm_assemble errors (LP: #1618429)
    - curtin/doc: overhaul curtin documentation for
      (LP: #1351085)
    - curtin.util: re-add support for RunInChroot (LP: #1617375)
    - curtin/net: overhaul of eni rendering to handle mixed ipv4/ipv6 configs
    - curtin.block: refactor clear_holders logic into block.clear_holders and
      cli cmd
    - curtin.apply_net should exit non-zero upon exception. (LP: #1615780)
    - apt: fix bug in disable_suites if sources.list line is blank.
    - vmtests: disable Wily in vmtests
    - Fix the unittests for test_apt_source.
    - get CURTIN_VMTEST_PARALLEL shown correctly in jenkins-runner output
    - fix vmtest check_file_strippedline to strip lines before comparing
    - fix whitespace damage in tests/vmtests/
    - fix dpkg-reconfigure when debconf_selections was provided.
      (LP: #1609614)
    - fix apt tests on non-intel arch
    - Add apt features to curtin. (LP: #1574113)
    - vmtest: easier use of parallel and controlling timeouts
    - mkfs.vfat: add force flag for formating whole disks (LP: #1597923)
    - block.mkfs: fix sectorsize flag (LP: #1597522)
    - block_meta: cleanup use of sys_block_path and handle cciss knames
      (LP: #1562249)
    - block.get_blockdev_sector_size: handle _lsblock multi result return
      (LP: #1598310)
    - util: add target (chroot) support to subp, add target_path helper.
    - block_meta: fallback to parted if blkid does not produce output
      (LP: #1524031)
    - commands.block_wipe: correct default wipe mode to 'superblock'
    - tox.ini: run coverage normally rather than separately
    - move uefi boot knowledge from launch and vmtest to xkvm

 -- Ryan Harper <email address hidden> Mon, 03 Oct 2016 13:43:54 -0500

Changed in curtin (Ubuntu Xenial):
status: Fix Committed → Fix Released
Revision history for this message
Martin Pitt (pitti) wrote : Update Released

The verification of the Stable Release Update for curtin has completed successfully and the package has now been released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regressions.

Revision history for this message
Scott Moser (smoser) wrote : Fixed in Curtin 17.1

This bug is believed to be fixed in curtin in 17.1. If this is still a problem for you, please make a comment and set the state back to New

Thank you.

Changed in curtin:
status: Fix Committed → Fix Released
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