A cancelled build left its lock directory behind on the shared tree, so
every later build of the same checkout waited for a lock whose owner was
gone. The build helper ran each command with a plain fork and killed only
the immediate child, so the shell's own workers survived the cancellation
and kept the tree in use.
XCAT::BuildUtils now runs each command in its own process group, blocks
the cancellation signals across the fork so neither side can miss the
group, and signals the group rather than the pid. It escalates to KILL,
confirms the group is gone, and retains the locks when it is not, so a
lock is never released while a worker can still write.
xCAT-test/unit/builddebs_lock_cancellation.t captures the defect. It
fails without the change.
Backport of #7867 to 2.19.
Signed-off-by: Daniel Hilst <392820+dhilst@users.noreply.github.com>
Unit tests. These run against the source tree only -- no xCAT installation, no
running daemons, no management node.
They are executed on every pull request by the xcat_test GitHub Actions workflow,
which calls run_unit_tests() in github_action_xcat_test.pl:
prove -r xCAT-test/unit
You can run exactly the same thing from a clean checkout:
cd <xcat-core checkout>
prove -r xCAT-test/unit
What belongs here
A test belongs in unit/ when everything it needs is in the checkout: plugin and
library sources, kickstart/preseed/subiquity templates, postscripts, packaging
metadata. Such a test asserts on rendered output or module logic and reaches the
repository root through FindBin:
Because of those FindBin paths the tests only work from a source tree. The copy
installed under /opt/xcat/share/xcat/tools/autotest/unit is not a substitute --
../.. resolves to /opt/xcat/share/xcat/tools there and the tests die or silently
skip. The CI takes a copy of the checkout before the build for this reason; see
preserve_source_tree().
What does not belong here
Anything that needs an installed xCAT, a populated /install, a real service binary
or a live daemon. Those go in ../integration and run on
a management node through xcattest. Both suites run on every pull request -- the
workflow installs xCAT on the runner and then runs the ci_test cases against it --
so putting a test in integration/ does not cost it CI coverage. What differs is what
each suite is allowed to depend on, and that unit tests also run standalone from a
bare checkout with no xCAT at all.
Shell-script unit tests belong in ../bats
and run with BATS. Do not add Perl .t tests that grep shell source when the
behavior can be exercised by sourcing a shell library or script and shadowing the
external commands it calls.
The distinction matters because a test that needs an absent environment does not fail
-- it calls plan skip_all and reports as skipped. A handful of those in a suite of
several hundred assertions is easy to stop reading. Keeping the two kinds in separate
directories means a skip in unit/ is a real signal rather than routine noise.
Guarding on a source file, on the other hand, is fine and common here:
planskip_all=>"compute.subiquity.tmpl not found"unless-f$tmpl_path;
Daniel Hilst
b62585475a