Upgrade data transfer step fails: /usr/bin/python: No such file or directory

[Jiří Stránský]

TASK [tripleo-transfer : wipe the destination directory] ***********************
Friday 24 May 2019 08:57:02 +0000 (0:00:00.377) 0:01:04.821 ************
[DEPRECATION WARNING]: evaluating mysql_upgrade_transfer as a bare variable,
this behaviour will go away and you might need to add |bool to the expression
in the future. Also see CONDITIONAL_BARE_VARS configuration toggle.. This
feature will be removed in version 2.12. Deprecation warnings can be disabled
by setting deprecation_warnings=False in ansible.cfg.
fatal: [undercloud]: FAILED! => {"changed": false, "module_stderr": "/bin/sh: /usr/bin/python: No such file or directory\n", "module_stdout": "", "msg": "The module failed to execute correctly, you probably need
 to set the interpreter.\nSee stdout/stderr for the exact error", "rc": 127}

This is likely due to some bad interaction between `delegate_to` used in that task, and the heterogenous mix of EL7/8 machines in the environment.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/661718

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/661718
Committed: https://git.openstack.org/cgit/openstack/tripleo-heat-templates/commit/?id=770b578bfbb151a91184f1e6f403e952def0c30e
Submitter: Zuul
Branch: master

commit 770b578bfbb151a91184f1e6f403e952def0c30e
Author: Jiri Stransky <email address hidden>
Date: Tue May 28 10:49:28 2019 +0000

    Explicitly set ansible_python_interpreter in external upgrade playbook

    During the run of external upgrade playbook, we connect to systems
    with different OS releases via delegate_to, which seems to confuse the
    autodetection of Python interpreter. Set it explicitly to
    platform-python which should work both on EL7 and EL8.

    Co-Authored-By: Sergii Golovatiuk <email address hidden>
    Change-Id: Ieb486f0c3e4de7229cdd2be49d4d0f038668f06d
    Closes-Bug: #1830713

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/stein
Review: https://review.opendev.org/665340

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/665340
Committed: https://git.openstack.org/cgit/openstack/tripleo-heat-templates/commit/?id=d5d227b5485c373e8c79de617c00f40c3b77b48d
Submitter: Zuul
Branch: stable/stein

commit d5d227b5485c373e8c79de617c00f40c3b77b48d
Author: Jiri Stransky <email address hidden>
Date: Tue May 28 10:49:28 2019 +0000

    Explicitly set ansible_python_interpreter in external upgrade playbook

    During the run of external upgrade playbook, we connect to systems
    with different OS releases via delegate_to, which seems to confuse the
    autodetection of Python interpreter. Set it explicitly to
    platform-python which should work both on EL7 and EL8.

    Co-Authored-By: Sergii Golovatiuk <email address hidden>
    Change-Id: Ieb486f0c3e4de7229cdd2be49d4d0f038668f06d
    Closes-Bug: #1830713
    (cherry picked from commit 770b578bfbb151a91184f1e6f403e952def0c30e)

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/tripleo-heat-templates 10.6.0 release.

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/tripleo-heat-templates 11.1.0 release.