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Daniel Hilst
81c5a27eb8
The EL build orchestrator never reclaimed the per-step mock buildroots it
created. Each build step makes a build chroot AND a per-uniqueext bootstrap
chroot under /var/lib/mock (dep packages, per-package perl chroots, and
xCAT-genesis-base); the child builders copy their RPMs/logs to their
--result-dir and exit without scrubbing, and mock's own cleanup leaves them
behind (and keeps them entirely on failure). So /var/lib/mock grew ~15-17G per
run, unbounded, until the build host filled to 99% and every mock dnf
transaction failed for lack of space ("Error: needs N MB more space on the /
filesystem", rc=30), cascading to rc=2/rc=255 across packages and killing
otherwise-healthy builds.
After the parallel build phase, scrub each step's buildroot with
"mock -r <chroot> --uniqueext <ext> --scrub=chroot --scrub=bootstrap" -- mock's
own lock-safe scrub: a chroot still held by a concurrent build is refused and
skipped (never rm, which would race a live build). Both the build chroot and its
per-uniqueext bootstrap are removed (each is per-uniqueext, so both leak); the
shared root cache under /var/cache/mock is kept so rebuilds stay fast. The
orchestrator scrubs the dep-package and genesis chroots (whose uniqueext it
assigns); mockbuild-perl-packages.pl scrubs each of its per-package chroots (it
derives its own per-package uniqueext). Scrubs are non-fatal -- a cleanup hiccup
never fails the build. --keep-buildroots preserves the buildroots for debugging.
Signed-off-by: Daniel Hilst <392820+dhilst@users.noreply.github.com>