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chore: cache terraform providers between CI test runs (#17373)
Addresses coder/internal#322. This PR starts caching Terraform providers used by `TestProvision` in `provisioner/terraform/provision_test.go`. The goal is to improve the reliability of this test by cutting down on the number of network calls to external services. It leverages GitHub Actions cache, which [on depot runners is persisted for 14 days by default](https://depot.dev/docs/github-actions/overview#cache-retention-policy). Other than the aforementioned `TestProvision`, I couldn't find any other tests which depend on external terraform providers.
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‎.github/actions/test-cache/download/action.yml‎

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name: "Download Test Cache"
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description: |
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Downloads the test cache and outputs today's cache key.
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A PR job can use a cache if it was created by its base branch, its current
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branch, or the default branch.
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https://docs.github.com/en/actions/writing-workflows/choosing-what-your-workflow-does/caching-dependencies-to-speed-up-workflows#restrictions-for-accessing-a-cache
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outputs:
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cache-key:
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description: "Today's cache key"
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value: ${{ steps.vars.outputs.cache-key }}
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inputs:
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key-prefix:
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description: "Prefix for the cache key"
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required: true
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cache-path:
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description: "Path to the cache directory"
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required: true
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# This path is defined in testutil/cache.go
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default: "~/.cache/coderv2-test"
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runs:
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using: "composite"
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steps:
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- name: Get date values and cache key
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id: vars
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shell: bash
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run: |
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export YEAR_MONTH=$(date +'%Y-%m')
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export PREV_YEAR_MONTH=$(date -d 'last month' +'%Y-%m')
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export DAY=$(date +'%d')
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echo "year-month=$YEAR_MONTH" >> $GITHUB_OUTPUT
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echo "prev-year-month=$PREV_YEAR_MONTH" >> $GITHUB_OUTPUT
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echo "cache-key=${{ inputs.key-prefix }}-${YEAR_MONTH}-${DAY}" >> $GITHUB_OUTPUT
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# TODO: As a cost optimization, we could remove caches that are older than
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# a day or two. By default, depot keeps caches for 14 days, which isn't
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# necessary for the test cache.
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# https://depot.dev/docs/github-actions/overview#cache-retention-policy
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- name: Download test cache
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uses: actions/cache/restore@5a3ec84eff668545956fd18022155c47e93e2684 # v4.2.3
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with:
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path: ${{ inputs.cache-path }}
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key: ${{ steps.vars.outputs.cache-key }}
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# > If there are multiple partial matches for a restore key, the action returns the most recently created cache.
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# https://docs.github.com/en/actions/writing-workflows/choosing-what-your-workflow-does/caching-dependencies-to-speed-up-workflows#matching-a-cache-key
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# The second restore key allows non-main branches to use the cache from the previous month.
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# This prevents PRs from rebuilding the cache on the first day of the month.
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# It also makes sure that once a month, the cache is fully reset.
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restore-keys: |
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${{ inputs.key-prefix }}-${{ steps.vars.outputs.year-month }}-
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${{ github.ref != 'refs/heads/main' && format('{0}-{1}-', inputs.key-prefix, steps.vars.outputs.prev-year-month) || '' }}

‎.github/actions/test-cache/upload/action.yml‎

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name: "Upload Test Cache"
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description: Uploads the test cache. Only works on the main branch.
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inputs:
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cache-key:
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description: "Cache key"
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required: true
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cache-path:
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description: "Path to the cache directory"
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required: true
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# This path is defined in testutil/cache.go
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default: "~/.cache/coderv2-test"
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runs:
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using: "composite"
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steps:
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- name: Upload test cache
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if: ${{ github.ref == 'refs/heads/main' }}
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uses: actions/cache/save@5a3ec84eff668545956fd18022155c47e93e2684 # v4.2.3
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with:
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path: ${{ inputs.cache-path }}
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key: ${{ inputs.cache-key }}

‎.github/workflows/ci.yaml‎

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- name: Setup Terraform
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uses: ./.github/actions/setup-tf
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- name: Download Test Cache
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id: download-cache
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uses: ./.github/actions/test-cache/download
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with:
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key-prefix: test-go-${{ runner.os }}-${{ runner.arch }}
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- name: Test with Mock Database
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id: test
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shell: bash
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gotestsum --junitfile="gotests.xml" --jsonfile="gotests.json" \
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--packages="./..." -- $PARALLEL_FLAG -short -failfast
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- name: Upload Test Cache
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uses: ./.github/actions/test-cache/upload
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with:
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cache-key: ${{ steps.download-cache.outputs.cache-key }}
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- name: Upload test stats to Datadog
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timeout-minutes: 1
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continue-on-error: true
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if: runner.os == 'Windows'
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uses: ./.github/actions/setup-imdisk
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- name: Download Test Cache
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id: download-cache
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uses: ./.github/actions/test-cache/download
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with:
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key-prefix: test-go-pg-${{ runner.os }}-${{ runner.arch }}
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- name: Test with PostgreSQL Database
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env:
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POSTGRES_VERSION: "13"
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make test-postgres
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- name: Upload Test Cache
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uses: ./.github/actions/test-cache/upload
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with:
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cache-key: ${{ steps.download-cache.outputs.cache-key }}
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- name: Upload test stats to Datadog
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timeout-minutes: 1
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continue-on-error: true
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- name: Setup Terraform
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uses: ./.github/actions/setup-tf
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- name: Download Test Cache
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id: download-cache
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uses: ./.github/actions/test-cache/download
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with:
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key-prefix: test-go-pg-16-${{ runner.os }}-${{ runner.arch }}
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- name: Test with PostgreSQL Database
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env:
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POSTGRES_VERSION: "16"
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TS_DEBUG_DISCO: "true"
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run: |
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make test-postgres
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- name: Upload Test Cache
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uses: ./.github/actions/test-cache/upload
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with:
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cache-key: ${{ steps.download-cache.outputs.cache-key }}
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- name: Upload test stats to Datadog
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timeout-minutes: 1
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continue-on-error: true
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- name: Setup Terraform
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uses: ./.github/actions/setup-tf
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- name: Download Test Cache
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id: download-cache
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uses: ./.github/actions/test-cache/download
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with:
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key-prefix: test-go-race-${{ runner.os }}-${{ runner.arch }}
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# We run race tests with reduced parallelism because they use more CPU and we were finding
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# instances where tests appear to hang for multiple seconds, resulting in flaky tests when
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# short timeouts are used.
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run: |
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gotestsum --junitfile="gotests.xml" -- -race -parallel 4 -p 4 ./...
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- name: Upload Test Cache
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uses: ./.github/actions/test-cache/upload
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with:
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cache-key: ${{ steps.download-cache.outputs.cache-key }}
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- name: Upload test stats to Datadog
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timeout-minutes: 1
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continue-on-error: true
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- name: Setup Terraform
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uses: ./.github/actions/setup-tf
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- name: Download Test Cache
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id: download-cache
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uses: ./.github/actions/test-cache/download
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with:
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key-prefix: test-go-race-pg-${{ runner.os }}-${{ runner.arch }}
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# We run race tests with reduced parallelism because they use more CPU and we were finding
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# instances where tests appear to hang for multiple seconds, resulting in flaky tests when
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# short timeouts are used.
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make test-postgres-docker
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DB=ci gotestsum --junitfile="gotests.xml" -- -race -parallel 4 -p 4 ./...
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- name: Upload Test Cache
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uses: ./.github/actions/test-cache/upload
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with:
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cache-key: ${{ steps.download-cache.outputs.cache-key }}
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- name: Upload test stats to Datadog
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timeout-minutes: 1
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continue-on-error: true

‎provisioner/terraform/executor.go‎

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mut *sync.Mutex
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binaryPath string
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// cachePath and workdir must not be used by multiple processes at once.
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cachePath string
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workdir string
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cachePath string
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cliConfigPath string
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workdir string
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// used to capture execution times at various stages
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timings *timingAggregator
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}
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if e.cachePath != "" && runtime.GOOS == "linux" {
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env = append(env, "TF_PLUGIN_CACHE_DIR="+e.cachePath)
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}
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if e.cliConfigPath != "" {
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env = append(env, "TF_CLI_CONFIG_FILE="+e.cliConfigPath)
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}
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return env
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}
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