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fix: separate .build cache keys for self-hosted runners #22

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Merged
ltetzlaff merged 1 commit into from
Oct 28, 2026
Merged

fix: separate .build cache keys for self-hosted runners #22

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10 changes: 8 additions & 2 deletions action.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -216,7 +216,13 @@ runs:
uses: actions/cache/restore@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
with:
path: ${{ inputs.path }}/.build
key: ${{ inputs.cache-key-prefix }}-${{ runner.os }}-${{ steps.install.outputs.ubuntu-version }}-${{ runner.arch }}-swift${{ steps.install.outputs.swift-version }}-${{ inputs.cache-suffix != '' && format('{0}-', inputs.cache-suffix) || '' }}${{ hashFiles(format('{0}/Package.resolved', inputs.path)) }}-${{ github.sha }}
key: ${{ inputs.cache-key-prefix }}-${{ runner.os }}-${{ steps.install.outputs.ubuntu-version }}-${{ runner.arch }}-${{ runner.environment == 'self-hosted' && 'self-hosted-' || '' }}swift${{ steps.install.outputs.swift-version }}-${{ inputs.cache-suffix != '' && format('{0}-', inputs.cache-suffix) || '' }}${{ hashFiles(format('{0}/Package.resolved', inputs.path)) }}-${{ github.sha }}
# Self-hosted runners get keys of their own: they check out under a
# different path (ARC uses /home/runner/_work, hosted /home/runner/work),
# and Clang's module cache records absolute paths, so a hosted .build
# fails there with "compiled with module cache path" / "missing required
# module 'SwiftShims'". Hosted keys are unchanged.
#
# The toolchain is in the key: another compiler's .build is useless — its
# modules cannot be loaded — and from 6.4 on SwiftPM builds with Swift
# Build into .build/out, so an older cache would only be dead weight
Expand All @@ -233,7 +239,7 @@ runs:
# rather than by narrowing this key, since first-party sources change on
# nearly every commit and keying on them would mean never reusing a cache.
restore-keys: |
${{ inputs.cache-key-prefix }}-${{ runner.os }}-${{ steps.install.outputs.ubuntu-version }}-${{ runner.arch }}-swift${{ steps.install.outputs.swift-version }}-${{ inputs.cache-suffix != '' && format('{0}-', inputs.cache-suffix) || '' }}${{ hashFiles(format('{0}/Package.resolved', inputs.path)) }}-
${{ inputs.cache-key-prefix }}-${{ runner.os }}-${{ steps.install.outputs.ubuntu-version }}-${{ runner.arch }}-${{ runner.environment == 'self-hosted' && 'self-hosted-' || '' }}swift${{ steps.install.outputs.swift-version }}-${{ inputs.cache-suffix != '' && format('{0}-', inputs.cache-suffix) || '' }}${{ hashFiles(format('{0}/Package.resolved', inputs.path)) }}-

# Skipped when the packages are already installed, so runner images that
# bake them in need neither sudo nor the apt round trip.
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