simplify Go version upgrade procedure

.github/actions/copy-workflow-go/action.yml

@@ -4,23 +4,32 @@ description: Copy workflow steps specific to go
 runs:
   using: "composite"
   steps:
+    # GitHub Actions Expressions do not support last item access/array length retrieval
+    - id: go
+      run: echo "::set-output name=version::$(jq -r '.[-1]' <<< '${{ toJSON(matrix.cfg.go.versions) }}')"
+      shell: bash
     - uses: actions/setup-go@v3
       with:
         # This should be the same Go version we use in the go-check workflow.
         # go mod tidy, go vet, staticcheck and gofmt might behave differently depending on the version.
-        go-version: "1.19.x"
+        go-version: ${{ steps.go.outputs.version }}
     - name: bump go.mod go version if needed
       uses: protocol/[email protected]
       with:
         working-directory: ${{ env.TARGET_REPO_DIR }}
         run: |
           # We want our modules to support two Go versions at a time.
-          # As of August 2022, Go 1.19 is the latest stable.
           # go.mod's Go version declares the language version being used.
           # As such, it has to be the minimum of all Go versions supported.
-          # Bump this every six months, as new Go versions come out.
-          TARGET_VERSION=1.18
-          PREVIOUS_TARGET_VERSION=1.17
+          TARGET_VERSION='${{ matrix.cfg.go.versions[0] }}'
+          TARGET_VERSION="${TARGET_VERSION%.x}"
+          TARGET_MAJOR_VERSION="${TARGET_VERSION%.[0-9]*}"
+          TARGET_MINOR_VERSION="${TARGET_VERSION#[0-9]*.}"
+          # Assumptions:
+          # - all versions are targetted incrementally
+          # - no versions are skipped
+          # - patch version is never pinned explicitly 
+          PREVIOUS_TARGET_VERSION="$TARGET_MAJOR_VERSION.$(($TARGET_MINOR_VERSION-1))"
 
           # Note that the "<" comparison doesn't understand semver,
           # but it should be good enough for the foreseeable future.

.github/workflows/release-check.yml

@@ -1,5 +1,11 @@
 name: Release Checker
-on: [ workflow_call ]
+on:
+  workflow_call:
+    inputs:
+      go-version:
+        required: true
+        type: string
+        default: 1.19.x # TODO: remove once release-check is upgraded in all the targets
 
 jobs:
   releaser:
@@ -10,7 +16,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-go@v3
         with:
-          go-version: "1.19.x"
+          go-version: ${{ inputs.go-version }}
       - id: version
         name: Determine version
         env:

configs/README.md

@@ -38,3 +38,12 @@ To customise the copy workflow further, you can add more fields to the `defaults
 ## Testing
 
 You can use [testing](https://github.com/protocol/.github/tree/testing) branch for worklow/configuration testing. Once you push your changes to the branch, a [dispatch](../.github/workflows/dispatch.yml) workflow will be triggered. The workflow will use [testing.json](testing.json) configuration file only. You can manipalate that configuration file as needed(you can copy all the `defaults` from [go.json](go.json) for [example](https://github.com/protocol/.github/commit/43476995428996a90ca95bf838f084ba1a710c68)).
+
+## Upgrading Go
+
+To upgrade Go, modify the `defaults.go.versions` array in the [Go config](go.json).
+
+Remember to:
+- Keep the array sorted in increasing order,
+- Upgrade versions incrementally. Do not skip a version,
+- never pin the patch version (`"1.19.x"` is correct, `"1.19.8"` is incorrect).

configs/go.json

@@ -9,7 +9,10 @@
       ".github/workflows/tagpush.yml"
     ],
     "deploy_versioning": true,
-    "deploy_go": true
+    "deploy_go": true,
+    "go": {
+      "versions": [ "1.18.x", "1.19.x" ]
+    }
   },
   "repositories": [
     {

templates/.github/workflows/go-check.yml

@@ -13,7 +13,7 @@ jobs:
         uses: protocol/.github/.github/actions/read-config@next
       - uses: actions/setup-go@v3
         with:
-          go-version: "1.19.x"
+          go-version: ${{{ config.go.versions[-1] }}}
       - name: Run repo-specific setup
         uses: ./.github/actions/go-check-setup
         if: hashFiles('./.github/actions/go-check-setup') != ''

templates/.github/workflows/go-test.yml

@@ -7,7 +7,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ "ubuntu", "windows", "macos" ]
-        go: [ "1.18.x", "1.19.x" ]
+        go: ${{{ config.go.versions }}}
     env:
       COVERAGES: ""
     runs-on: ${{ fromJSON(vars[format('UCI_GO_TEST_RUNNER_{0}', matrix.os)] || format('"{0}-latest"', matrix.os)) }}

templates/.github/workflows/release-check.yml

@@ -6,3 +6,5 @@ on:
 jobs:
   release-check:
     uses: protocol/.github/.github/workflows/release-check.yml@master
+    with:
+      go-version: ${{{ config.go.versions[-1] }}}