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bzr: Allow cloning with breezy version without cmd_clone function

Antoine R. Dumont requested to merge generated-differential-D7132-source into generated-differential-D7132-target

Without this, on stable node, the actual loader would not clone properly the bazar repository. The function actually doing the cloning is defined for version 3.1 onward (on stable, we are running the 3.0).

Related to swh/infra/sysadm-environment#3915 (closed)

Test Plan

in the bzr_clone function defined (drop the code doing the import from new breezy version, only keep the subprocess call and it's all green nonetheless).

That is:

$ grep -A17 "def bzr_clone" swh/loader/bzr/loader.py
def bzr_clone(origin_url: str, repo_directory: str) -> Callable:
    """Bazaar clone function"""
    # try:
    #     from breezy.builtins import cmd_clone
    #     closure_clone = partial(cmd_clone().run, origin_url, repo_directory)
    # except ImportError:
    #     # stable python3.breezy does not define the cmd_clone yet
    #     # fallback
    #     def closure_clone():
    #         from subprocess import run
    #         run(["bzr", "clone", origin_url, repo_directory])
    # stable python3.breezy does not define the cmd_clone yet
    # fallback
    def closure_clone():
        from subprocess import run
        run(["bzr", "clone", origin_url, repo_directory])

    return closure_clone
$ pytest --ff -x -s swh/loader/bzr/tests
============================================================================================================= test session starts =============================================================================================================
platform linux -- Python 3.9.2, pytest-6.2.5, py-1.10.0, pluggy-1.0.0
rootdir: /home/tony/work/inria/repo/swh/swh-environment/swh-loader-bzr, configfile: pytest.ini
plugins: redis-2.1.1, forked-1.3.0, asyncio-0.15.1, django-4.4.0, django-test-migrations-1.1.0, requests-mock-1.9.3, flask-1.2.0, celery-0.0.0, mock-3.6.1, hypothesis-6.21.0, postgresql-2.6.1, dash-2.0.0, xdist-2.3.0, swh.core-1.1.1, swh.journal-1.0.0
collected 14 items
run-last-failure: no previously failed tests, not deselecting items.

swh/loader/bzr/tests/test_loader.py   create_plpgsql_language
----------------------------
 language already installed
(1 row)

Created new control directory.
............
swh/loader/bzr/tests/test_tasks.py [2022-02-09 14:34:04,653: INFO/MainProcess] Connected to memory://guest@localhost//
[2022-02-09 14:34:05,661: INFO/MainProcess] Task celery.ping[9f1f8a6b-0460-448b-b57c-0839b1b3c624] received
[2022-02-09 14:34:05,663: INFO/MainProcess] Task celery.ping[9f1f8a6b-0460-448b-b57c-0839b1b3c624] succeeded in 0.0013701990028494038s: 'pong'
[2022-02-09 14:34:06,665: INFO/MainProcess] Task swh.loader.bzr.tasks.LoadBazaar[45864edb-90cd-4c48-ba5d-3e04c281e97e] received
[2022-02-09 14:34:06,672: INFO/MainProcess] Task swh.loader.bzr.tasks.LoadBazaar[45864edb-90cd-4c48-ba5d-3e04c281e97e] succeeded in 0.006103710002207663s: {'status': 'eventful'}
.

============================================================================================================== warnings summary ===============================================================================================================
swh/loader/bzr/tests/test_tasks.py::test_loader
  /home/tony/.virtualenvs/swh/lib/python3.9/site-packages/mercurial/utils/resourceutil.py:12: DeprecationWarning: the imp module is deprecated in favour of importlib; see the module's documentation for alternative uses
    import imp

-- Docs: https://docs.pytest.org/en/stable/warnings.html
======================================================================================================== 14 passed, 1 warning in 7.94s ========================================================================================================

tox

Migrated from D7132 (view on Phabricator)

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