git-artifacts: allow restricting which artifacts are built

Users can now specify which artifacts they want to build, via passing a
client payload that sets the `build_only` attribute, like this:

	curl -i -H 'Authorization: token <PAT>' \
		-H 'Accept: application/vnd.github.everest-preview+json' \
		--request POST \
		--data '{
			"event_type": "git-artifacts",
			"client_payload": {
				"build_only": "portable-x86_64"
			}
		}' https://api.github.com/repos/<user>/git/dispatches

The `build_only` value is a comma-separated list of prefixes. Therefore,
`installer,portable` will build `installer-x86_64`, `installer-i686`,
`portable-x86_64` and `portable-i686`, and an empty or unset value will
build all.

Please note that the `mingw-w64-git` packages are built always, as it
would be tricky to figure out when they need to be built (for example,
`build_only=portable-x86_64` technically does not need `pkg-i686` to be
built, while `build_only=portable` does).

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

.github/workflows/git-artifacts.yml

@@ -12,6 +12,7 @@ env:
   MSYSTEM: MINGW64
   PACKAGER: ${{github.actor}} <${{github.actor}}@users.noreply.github.com>
   USERPROFILE: "${{github.workspace}}\\home"
+  BUILD_ONLY: "${{github.event.client_payload.build_only}}"
 
 jobs:
   bundle-artifacts:
@@ -182,33 +183,44 @@ jobs:
     env:
       MSYSTEM: MINGW${{matrix.arch.bitness}}
     steps:
+      - name: Determine whether this job should be skipped
+        shell: python
+        run: |
+          import os
+          if ("BUILD_ONLY" in os.environ) and len([x for x in os.environ["BUILD_ONLY"].split(",") if "${{matrix.artifact.name}}-${{matrix.arch.name}}".startswith(x)]) == 0:
+            print("::set-env name=SKIP::true")
       - name: Download pkg-${{matrix.arch.name}}
+        if: env.SKIP != 'true'
         uses: actions/download-artifact@v1
         with:
           name: pkg-${{matrix.arch.name}}
           path: pkg-${{matrix.arch.name}}
       - name: Download bundle-artifacts
+        if: env.SKIP != 'true'
         uses: actions/download-artifact@v1
         with:
           name: bundle-artifacts
           path: bundle-artifacts
       - name: Download git-sdk-${{matrix.arch.bitness}}-build-installers
+        if: env.SKIP != 'true'
         shell: bash
         run: a=git-sdk-${{matrix.arch.bitness}}-build-installers && mkdir -p $a && curl -# https://wingit.blob.core.windows.net/ci-artifacts/$a.tar.xz | tar -C $a -xJf -
       - name: Clone build-extra
+        if: env.SKIP != 'true'
         run: git clone --single-branch -b master https://github.com/git-for-windows/build-extra git-sdk-${{matrix.arch.bitness}}-build-installers\usr\src\build-extra
       - name: Prepare home directory for code-signing
         env:
           CODESIGN_P12: ${{secrets.CODESIGN_P12}}
           CODESIGN_PASS: ${{secrets.CODESIGN_PASS}}
-        if: (matrix.artifact.name == 'installer' || matrix.artifact.name == 'portable') && env.CODESIGN_P12 != '' && env.CODESIGN_PASS != ''
+        if: env.SKIP != 'true' && (matrix.artifact.name == 'installer' || matrix.artifact.name == 'portable') && env.CODESIGN_P12 != '' && env.CODESIGN_PASS != ''
         shell: bash
         run: |
           mkdir -p home/.sig &&
           echo "$CODESIGN_P12" | tr % '\n' | base64 -d >home/.sig/codesign.p12 &&
           echo "$CODESIGN_PASS" >home/.sig/codesign.pass &&
           git config --global alias.signtool '!sh "/usr/src/build-extra/signtool.sh"'
       - name: Build ${{matrix.arch.bitness}}-bit ${{matrix.artifact.name}}
+        if: env.SKIP != 'true'
         shell: powershell
         run: |
           & .\git-sdk-${{matrix.arch.bitness}}-build-installers\usr\bin\bash.exe -lc @"
@@ -221,7 +233,7 @@ jobs:
             openssl dgst -sha256 artifacts/${{matrix.artifact.fileprefix}}-*.${{matrix.artifact.fileextension}} | sed \"s/.* //\" >artifacts/sha-256.txt
           "@
       - name: Copy package-versions and pdbs
-        if: matrix.artifact.name == 'installer'
+        if: env.SKIP != 'true' && matrix.artifact.name == 'installer'
         shell: powershell
         run: |
           & .\git-sdk-${{matrix.arch.bitness}}-build-installers\usr\bin\bash.exe -lc @"
@@ -235,10 +247,11 @@ jobs:
             GIT_CONFIG_PARAMETERS=\"'windows.sdk${{matrix.arch.bitness}}.path='\" ./please.sh bundle_pdbs --arch=${{matrix.arch.name}} --directory=\"`$a\" installer/package-versions.txt)
           "@
       - name: Clean up temporary files
-        if: always()
+        if: always() && env.SKIP != 'true'
         shell: bash
         run: rm -rf home
       - name: Publish ${{matrix.artifact.name}}-${{matrix.arch.name}}
+        if: env.SKIP != 'true'
         uses: actions/upload-artifact@v1
         with:
           name: ${{matrix.artifact.name}}-${{matrix.arch.name}}
@@ -247,23 +260,35 @@ jobs:
     runs-on: windows-latest
     needs: pkg
     steps:
+      - name: Determine whether this job should be skipped
+        shell: python
+        run: |
+          import os
+          if ("BUILD_ONLY" in os.environ) and len([x for x in os.environ["BUILD_ONLY"].split(",") if "nuget-x86_64".startswith(x)]) == 0:
+            print("::set-env name=SKIP::true")
       - name: Download pkg-x86_64
+        if: env.SKIP != 'true'
         uses: actions/download-artifact@v1
         with:
           name: pkg-x86_64
           path: pkg-x86_64
       - name: Download bundle-artifacts
+        if: env.SKIP != 'true'
         uses: actions/download-artifact@v1
         with:
           name: bundle-artifacts
           path: bundle-artifacts
       - name: Download git-sdk-64-build-installers
+        if: env.SKIP != 'true'
         shell: bash
         run: a=git-sdk-64-build-installers && mkdir -p $a && curl -# https://wingit.blob.core.windows.net/ci-artifacts/$a.tar.xz | tar -C $a -xJf -
       - name: Clone build-extra
+        if: env.SKIP != 'true'
         run: git clone --single-branch -b master https://github.com/git-for-windows/build-extra git-sdk-64-build-installers\usr\src\build-extra
       - uses: nuget/setup-nuget@v1
+        if: env.SKIP != 'true'
       - name: Build 64-bit NuGet packages
+        if: env.SKIP != 'true'
         shell: powershell
         run: |
           & .\git-sdk-64-build-installers\usr\bin\bash.exe -lc @"
@@ -275,6 +300,7 @@ jobs:
             openssl dgst -sha256 artifacts/Git*.nupkg | sed \"s/.* //\" >artifacts/sha-256.txt
           "@
       - name: Publish nuget-x86_64
+        if: env.SKIP != 'true'
         uses: actions/upload-artifact@v1
         with:
           name: nuget-x86_64