This change implements a file locking mechanism in the
jenkins-runner and vmtest-sync-images scripts.
The vmtest-sync-images script requires two exclusive locks
to start updating the images: a lock on IMAGE_DIR and a
lock on a lockfile. The script will wait to get both locks
locks before actually updating the images.
The jenkins-runner script does the following:
(1) set a shared lock on IMAGE_DIR
(2) set a shared lock on the lockfile
(3) release the lock on IMAGE_DIR
(4) run the vmtests
(5) exit (releasing the lock on the lockfile)
The jenkins-runner does not hold a lock on IMAGE_DIR while
running, allowing vmtest-sync-images to set a lock there,
prevending further jenkins-runners from running the vmtests
while the images are being updated. In other words
vmtest-sync-images can "book" the images for the next
available slot.
Steps (1) and (3) can be skipped by passing the
--skip-images-dirlock option to jenkins-runner. In this way
jenkins-runner has precedence over vmtest-sync-images. This
is useful when it should run ASAP, for example in CI runs.
Make the vmtests/test_basic test suite run on ppc64el
Changes:
- On ppc64el inject a PReP partition to the storage configuration
- Expect a GPT partition table and not a DOS one on ppc64el
- Skip XenialGAi386TestBasic if target_arch != amd64
- Skip XenialGAi386TestZfsRoot if target_arch != amd64
- Skip XenialGAi386TestZfsRootFsType if target_arch != amd64
- Skip test_partition_is_zero on ppc64el (LP: #1843288)
- Skip all the CentOS tests if target_arch = ppc64el
This is required because master and the ubuntu/* branches now conflict
on merge, due to different Depends lines for probert. This commit being
present in master and in each of the packaging branches gives git enough
information to not conflict.