ci: create script to set up Git for Windows SDK

In order to build and test Git, we have to first set up the Git for
Windows SDK, which contains various required tools and libraries. The
SDK is basically a clone of [1], but that repository is quite large due
to all the binaries it contains. We thus use both shallow clones and
sparse checkouts to speed up the setup. To handle this complexity we use
a GitHub action that is hosted externally at [2].

Unfortunately, this makes it rather hard to reuse the logic for CI
platforms other than GitHub Actions. After chatting with Johannes
Schindelin we came to the conclusion that it would be nice if the Git
for Windows SDK would regularly publish releases that one can easily
download and extract, thus moving all of the complexity into that single
step. Like this, all that a CI job needs to do is to fetch and extract
the resulting archive. This published release comes in the form of a new
"ci-artifacts" tag that gets updated regularly [3].

Implement a new script that knows how to fetch and extract that script
and convert GitHub Actions to use it.

[1]: https://github.com/git-for-windows/git-sdk-64/
[2]: https://github.com/git-for-windows/setup-git-for-windows-sdk/
[3]: https://github.com/git-for-windows/git-sdk-64/releases/tag/ci-artifacts/

Helped-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 916a64b6736d1c341e3b099dcc0b3fb25cf37873..9301a1edd6d8496c8d1bc799f6a33d6041688392 100644 (file)
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -113,13 +113,15 @@ jobs:
       cancel-in-progress: ${{ needs.ci-config.outputs.skip_concurrent == 'yes' }}
     steps:
     - uses: actions/checkout@v4
-    - uses: git-for-windows/setup-git-for-windows-sdk@v1
+    - name: setup SDK
+      shell: powershell
+      run: ci/install-sdk.ps1
     - name: build
-      shell: bash
+      shell: powershell
       env:
         HOME: ${{runner.workspace}}
         NO_PERL: 1
-      run: . /etc/profile && ci/make-test-artifacts.sh artifacts
+      run: git-sdk/usr/bin/bash.exe -l -c 'ci/make-test-artifacts.sh artifacts'
     - name: zip up tracked files
       run: git archive -o artifacts/tracked.tar.gz HEAD
     - name: upload tracked files and build artifacts
@@ -147,10 +149,12 @@ jobs:
     - name: extract tracked files and build artifacts
       shell: bash
       run: tar xf artifacts.tar.gz && tar xf tracked.tar.gz
-    - uses: git-for-windows/setup-git-for-windows-sdk@v1
+    - name: setup SDK
+      shell: powershell
+      run: ci/install-sdk.ps1
     - name: test
-      shell: bash
-      run: . /etc/profile && ci/run-test-slice.sh ${{matrix.nr}} 10
+      shell: powershell
+      run: git-sdk/usr/bin/bash.exe -l -c 'ci/run-test-slice.sh ${{matrix.nr}} 10'
     - name: print test failures
       if: failure() && env.FAILED_TEST_ARTIFACTS != ''
       shell: bash

diff --git a/ci/install-sdk.ps1 b/ci/install-sdk.ps1
new file mode 100755 (executable)
index 0000000..66f2483
--- /dev/null
+++ b/ci/install-sdk.ps1
@@ -0,0 +1,12 @@
+param(
+    [string]$directory='git-sdk',
+    [string]$url='https://github.com/git-for-windows/git-sdk-64/releases/download/ci-artifacts/git-sdk-x86_64-minimal.zip'
+)
+
+Invoke-WebRequest "$url" -OutFile git-sdk.zip
+Expand-Archive -LiteralPath git-sdk.zip -DestinationPath "$directory"
+Remove-Item -Path git-sdk.zip
+
+New-Item -Path .git/info -ItemType Directory -Force
+New-Item -Path .git/info/exclude -ItemType File -Force
+Add-Content -Path .git/info/exclude -Value "/$directory"