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Cache & restore the archive #201

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44 changes: 42 additions & 2 deletions action.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -57,6 +57,10 @@ inputs:
description: "Whether to write summary to GITHUB_STEP_SUMMARY"
required: false
default: "false"
cache-binary:
description: "Use actions/cache to cache the downloaded dagger binary"
required: false
default: "false"
outputs:
output:
description: "Job output"
Expand All @@ -67,7 +71,17 @@ outputs:
runs:
using: "composite"
steps:
- id: dagger-cache-restore
if: inputs.cache-binary == 'true'
uses: actions/cache/restore@v4
with:
path: ${{ runner.temp }}/dagger-cache
key: dagger-${{ runner.os }}-${{ inputs.version }}-${{ inputs.commit }}
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@perwestling perwestling Mar 18, 2026

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I am wondering what happens if version and commit both are specified?

For key should it be that OS + commit used if commit is specified, or OS + version if commit is not specified?
I could not find any checks that commit matches version.

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@perwestling perwestling Mar 18, 2026

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Another thing:

  • What if version is "latest"
  • And commit is not specified

Does this means that we will use a cached latest version? Which will not be updated if latest changes?


- shell: bash
env:
CACHE_BINARY: ${{ inputs.cache-binary }}
CACHE_HIT: ${{ steps.dagger-cache-restore.outputs.cache-hit }}
run: |
set -o pipefail
# Fallback to /usr/local for backwards compatability
Expand Down Expand Up @@ -103,11 +117,37 @@ runs:
echo "::endgroup::"
fi

cache_dir="${RUNNER_TEMP:-/tmp}/dagger-cache"
if [[ "$CACHE_BINARY" == "true" && "$CACHE_HIT" == "true" && -x "${cache_dir}/bin/dagger" ]]; then
echo "::group::Installing dagger (from cache)"
mkdir -p "${prefix_dir}/bin"
cp "${cache_dir}/bin/dagger" "${prefix_dir}/bin/dagger"
chmod +x "${prefix_dir}/bin/dagger"
echo "Restored dagger from cache"
echo "::endgroup::"
exit 0
fi

echo "::group::Installing dagger"
curl -fsSL https://dl.dagger.io/dagger/install.sh | \
BIN_DIR=${prefix_dir}/bin DAGGER_VERSION="$VERSION" DAGGER_COMMIT="$COMMIT" sh
if [[ "$CACHE_BINARY" == "true" ]]; then
mkdir -p "${cache_dir}/bin" "${prefix_dir}/bin"
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@perwestling perwestling Mar 18, 2026

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Do we need to ensure these directories does not already exists? We could add a rm before just in case.

curl -fsSL https://dl.dagger.io/dagger/install.sh | \
BIN_DIR="${cache_dir}/bin" DAGGER_VERSION="$VERSION" DAGGER_COMMIT="$COMMIT" sh
cp "${cache_dir}/bin/dagger" "${prefix_dir}/bin/dagger"
chmod +x "${prefix_dir}/bin/dagger"
else
curl -fsSL https://dl.dagger.io/dagger/install.sh | \
BIN_DIR=${prefix_dir}/bin DAGGER_VERSION="$VERSION" DAGGER_COMMIT="$COMMIT" sh
fi
echo "::endgroup::"

- id: dagger-cache-save
if: inputs.cache-binary == 'true' && steps.dagger-cache-restore.outputs.cache-hit != 'true'
uses: actions/cache/save@v4
with:
path: ${{ runner.temp }}/dagger-cache
key: dagger-${{ runner.os }}-${{ inputs.version }}-${{ inputs.commit }}

- id: should-exec
shell: bash
env:
Expand Down