GitHub操作:在Windows环境上缓存Maven .m2存储库C\:\\Users\runneradmin\\.m2\repository:无法统计:没有这样的文件或目录

Question

As the docs state为了使用GitHub操作缓存Maven依赖项，我们只需使用如下所示的actions/cache操作：

steps:
  - uses: actions/checkout@v2
  - name: Set up JDK 1.8
    uses: actions/setup-java@v1
    with:
      java-version: 1.8
  - name: Cache Maven packages
    uses: actions/cache@v2
    with:
      path: ~/.m2
      key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
      restore-keys: ${{ runner.os }}-m2
  - name: Build with Maven
    run: mvn --batch-mode --update-snapshots verify

但是，使用windows-2016 GitHub Actions环境时，这并不能为我们提供工作缓存- as the logs states

Post job cleanup.
"C:\Program Files\Git\usr\bin\tar.exe" --posix --use-compress-program "zstd -T0" -cf cache.tzst -P -C D:/a/spring-boot-admin/spring-boot-admin --files-from manifest.txt --force-local
/usr/bin/tar: C\:\\Users\runneradmin\\.m2\repository: Cannot stat: No such file or directory
/usr/bin/tar: Exiting with failure status due to previous errors
Warning: Tar failed with error: The process 'C:\Program Files\Git\usr\bin\tar.exe' failed with exit code 2

如何解决这个问题？

Answer 1

指向Maven存储库的路径似乎未正确初始化。作为this issue describes，路径是用\\编写的，而不是GNU期望的/。The fix was already provided in Dec 2020，所以它被移植到了v2.1.4版本。最新版本的v2.1.3是在11月发布的。但遗憾的是，还有a bug in pointing the v2 to the latest v2.1.4 (正如GitHub Actions用户通常所期望的那样)。因此，为了解决这个问题，我们需要明确地指定完整的操作/缓存版本v2.1.4，如下所示：

steps:
  - uses: actions/checkout@v2
  - name: Set up JDK 1.8
    uses: actions/setup-java@v1
    with:
      java-version: 1.8
  - name: Cache Maven packages
    uses: actions/cache@v2.1.4
    with:
      path: ~/.m2
      key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
      restore-keys: ${{ runner.os }}-m2
  - name: Build with Maven
    run: mvn --batch-mode --update-snapshots verify

现在，它应该像一个护身符一样工作(see logs here)。