ci(build): per-job CONAN_HOME for the 5 remaining conan-building jobs#710
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linux-asan, coin-bch, coin-bch-asan, windows, coin-dgb-auxdoge still cached the shared ~/.conan2 on the self-hosted host, so concurrent jobs tore each other's b2/boost cache -> intermittent AsAN/BCH/DGB reds. Apply the #704 linux pattern to all five: export CONAN_HOME=$RUNNER_TEMP/conan2 via $GITHUB_ENV in a post-checkout step (PowerShell Out-File form on windows), point the cache path at ${{ runner.temp }}/conan2, and scope the two colliding keys (linux-asan -> -asan, coin-bch-asan -> -bch-asan).
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Jul 19, 2026
…te lanes
The Conan cache-lock flake is not CodeQL-specific. Job 88179349495
(Coin matrix / ltc smoke) and 88188892260 (CI / Linux x86_64) fail the
same way: actions/cache reports a hit, the restore of the multi-hundred-MB
conan2 tree onto VM905 then times out ("Failed to restore: The operation
cannot be completed in timeout"), the home is left empty, and all eight
runners fall into a simultaneous cold from-source rebuild whose I/O storm
blows the 20s sqlite lock timeout ("Conan failed to acquire database lock").
Apply the same three-part fix everywhere the pattern appears:
* CONAN_HOME on self-hosted becomes $HOME/.conan2-ci/$RUNNER_NAME --
persistent, so the cache-service restore is off the hot path, and
keyed on the runner instance, which executes one job at a time, so it
is never contended and keeps the per-job isolation of #704/#710.
github-hosted forks keep RUNNER_TEMP/conan2 + actions/cache unchanged.
* actions/cache conan2 steps are gated to runner.environment ==
github-hosted.
* conan install gets a bounded 3x retry; remote downloads are the only
network step left.
Also scopes coin-matrix orphaned-tempfile cleanup to $CONAN_HOME instead
of the shared ~/.conan2, which it was mutating out from under peer jobs,
and repoints the CodeQL home from .conan2-codeql to the same per-runner
path (that one was still shared across runners on concurrent refs).
Windows (VM217) lanes are untouched: no restore flake reported there.
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Finishes the #704 durability pass. Five conan-building jobs in build.yml still cached the shared
~/.conan2on the self-hosted c2pool-linux-905 host, so concurrent jobs kept tearing each other's b2/boost cache — the intermittentb2/5.5.1 ... file to download already existsreds the operator flagged on AsAN/BCH/DGB (#706/#708/#709).Applies the
linux-job pattern (from #704) to all five:Set per-job Conan homestep exportingCONAN_HOME=\$RUNNER_TEMP/conan2via\$GITHUB_ENV(not job-level env — that is the runner.temp parse break patched in ci: fix job-level CONAN_HOME (runner.temp invalid at job-env → 0 jobs) #704).Out-Fileform, inheriting the job's ExecutionPolicy-Bypass shell.path: ~/.conan2->\${{ runner.temp }}/conan2on all five.-asan, coin-bch-asan ->-bch-asan(coin-bch/windows/dgb keys were already distinct).Verified:
yaml.safe_loadparses; 6/6 conan cache paths now per-job runner.temp; all 6 keys unique. Diff is build.yml only (+41/-7). Needs a PR run where linux-asan/coin-bch/coin-dgb-auxdoge go green without a retry. No self-merge — integrator review + operator workflow-scope tap.