lix-project/buildbot-nix
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use build-local gc-root directory

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without this two builds can interfere with each other if:

  - builds 1 and 2 start
  - build 1 is starved of workers
  - build 2 finishes, removes the shared gcroots directory
  - gc runs
  - build 1 schedules more builds whose .drvs have now been removed

using a dedicated directory for each build fixes this.

we now also need to set alwaysRun on the cleanup command or we risk
littering the system with stale gc roots when a build fails.
This commit is contained in:
eldritch horrors 2024-03-11 06:40:14 +01:00
parent 156e6e3dea
commit f869b52a8d
1 changed files with 6 additions and 1 deletions
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7
buildbot_nix/__init__.py
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@ -259,8 +259,12 @@ def nix_eval_config(
sshPrivateKey=gerrit_private_key
),
)
# use one gcroots directory per worker. this should be scoped to the largest unique resource
# in charge of builds (ie, buildnumber is too narrow) to not litter the system with permanent
# gcroots in case of worker restarts.
# TODO perhaps we should clean the entire /drvs/ directory up too during startup.
drv_gcroots_dir = util.Interpolate(
"/nix/var/nix/gcroots/per-user/buildbot-worker/%(prop:project)s/drvs/",
"/nix/var/nix/gcroots/per-user/buildbot-worker/%(prop:project)s/drvs/%(prop:workername)s/",
)
factory.addStep(
@ -297,6 +301,7 @@ def nix_eval_config(
"-rf",
drv_gcroots_dir,
],
alwaysRun=True,
),
)