AttributeError: module 'curtin.util' has no attribute 'RunInChroot'

[Andres Rodriguez]

[Impact]

 * Curtin removed a previously used python module method,
   'RunInChroot' which was used by non-ubuntu curthooks for
   deploying OSes like CentOS. Removing the method prevents
   deploying CentOS where it worked prior to updating.

   Curtin has been updated to include an alias to the previous method that
   provides backward compat to callers of 'RunInChroot'

[Test Case]

 * Install proposed curtin package and deploy CentOS to target system

  PASS: CentOS deploys successfully.

  FAIL: CentOS deployment fails with message:

  AttributeError: module 'curtin.util' has no attribute 'RunInChroot'

[Regression Potential]

 * Other OSes besides CentOS may have used other flags against
   the original 'RunInChroot' method which is not being tested and
   may fail with the backward compat mode supporting 'RunInChroot'.

[Original Description]
I tested curtin bzr418 and bzr415, and I get the following error. This is a regression provided that it is not backward compatible and will cause all CentOS deployments via MAAS to fail.

MAAS injects curtin_hooks code to CentOS images that call such function. If users upgrade to the latest curtin, they wont be able to deploy CentOS.

AttributeError: module 'curtin.util' has no attribute 'RunInChroot'

curtin bzr418:

In [1]: import curtin.util

In [2]: curtin.util.RunInChroot
---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
<ipython-input-2-4e8269de26cc> in <module>()
----> 1 curtin.util.RunInChroot

AttributeError: module 'curtin.util' has no attribute 'RunInChroot'

curtin bzr399:

In [1]: import curtin.util

In [2]: curtin.util.RunInChroot
Out[2]: curtin.util.RunInChroot

[Ryan Harper (raharper)]

bzr revno 404 introduced the change.

[Christian Ehrhardt  (paelzer)]

FYI - I can confirm but I think we need a discussion if this is a "bug" in the common sense.
Cause is http://bazaar.launchpad.net/~curtin-dev/curtin/trunk/revision/404

How much is curtin supposed to be stable as in ABI/API or not regarding those calls into it?
Up to smoser to discuss/decide I think.

[Andy Whitcroft (apw)]

Hello Andres, or anyone else affected,

Accepted curtin into xenial-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/curtin/0.1.0~bzr425-0ubuntu1~16.04.1 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed 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 https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance!

[Nathaniel W. Turner (nturner)]

Deploying a node with CentOS 7 and with CentOS 6 now succeeds.

Tested with:

curtin-common_0.1.0~bzr425-0ubuntu1~16.04.1_all.deb
python3-curtin_0.1.0~bzr425-0ubuntu1~16.04.1_all.deb
maas* 2.1.0~beta2+bzr5454-0ubuntu1~16.04.1

[Launchpad Janitor (janitor)]

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 readthedocs.org
      (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/__init__.py
    - 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

[Martin Pitt (pitti)]

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.

[Scott Moser (smoser)]

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.