英文:
how to check diff of a file compared to the previous commit on github action
问题
我有一个存储时间戳的文件。
为了检查该文件是否与先前的提交有所更改，我只需在本地运行 git diff，然后解析输出：
git diff --word-diff=porcelain HEAD~1 -- dev/tests/artifact_build_timestamp.info > /tmp/timestamp-diff.txt || exit 2;
即使在工作目录中有一个新的未提交的时间戳，这也是有用的。
但是：在 GitHub Actions 中，这是不可能的。在检出时，它处于分离模式，我无法与 HEAD~1 进行比较：
通过使用 actions/checkout@v3 操作，它执行以下操作（我希望它执行）。为了获得完整的历史记录，我设置了 fetch-depth: 0
Checking out the ref
/usr/bin/git checkout --progress --force refs/remotes/pull/4/merge
Note: switching to 'refs/remotes/pull/4/merge'.
我想知道与其先前的提交进行比较的最佳方法是什么。我有一个想法：
if [[ ! -z "$CI" ]]; then
BRANCH_NAME=${GITHUB_HEAD_REF}
git pull origin ${BRANCH_NAME} || exit 1;
git diff --word-diff=porcelain origin/${BRANCH_NAME}~1 origin/${BRANCH_NAME} -- dev/tests/artifact_build_timestamp.info > /tmp/timestamp-diff.txt || exit 2;
fi
但我不知道在任何情况下运行操作是否安全，甚至是否有更好的方法。
英文:
I have a file with a timestamp stored in it.
In order to check if that file has changed compared to the previous commit, I simply git diff on local, and then I parse the output:
git diff --word-diff=porcelain HEAD~1 -- dev/tests/artifact_build_timestamp.info > /tmp/timestamp-diff.txt || exit 2;
This is useful even when I have a new uncommited timestamp on the WD too.
But: on github actions this is not possible. When checking out, it is in detached mode and I can't compare against HEAD~1:
By using the actions/checkout@v3 action this is what it performs (and I want it to perform). In order to have the full history I set the fetch-depth: 0
Checking out the ref
/usr/bin/git checkout --progress --force refs/remotes/pull/4/merge
Note: switching to 'refs/remotes/pull/4/merge'.
I'm wondering what's the best way to compare against its previous commit. An idea I have is:
if [[ ! -z "$CI" ]]; then
BRANCH_NAME=${GITHUB_HEAD_REF}
git pull origin ${BRANCH_NAME} || exit 1;
git diff --word-diff=porcelain origin/${BRANCH_NAME}~1 origin/${BRANCH_NAME} -- dev/tests/artifact_build_timestamp.info > /tmp/timestamp-diff.txt || exit 2;
fi
But I don't know if it's safe on any case an action could be run, or even if there is a better way.
答案1
得分: 2
默认情况下，actions/checkout 只会检出一个提交，使得检出是浅层的。
如果你想要额外检出一个（之前的）提交，将 fetch-depth 输入设置为 1：
- uses: actions/checkout@v2
with:
fetch-depth: 1
如果你想要整个历史记录（所有提交），将 fetch-depth 输入设置为 0：
- uses: actions/checkout@v2
with:
fetch-depth: 0
请参考文档。
当进行检出时，它处于分离状态
这是无关紧要的。无论是分离的 HEAD 还是在分支上 — 如果你有两个提交，你可以运行 git diff HEAD~。如果你只有一个提交，你不能运行 — 因为没有 HEAD~。
英文:
By default actions/checkout only checks out a single commit, making the checkout shallow.
If you want one additional (previous) commit set the fetch-depth input to 1:
- uses: actions/checkout@v2
with:
fetch-depth: 1
If you want the entire history (all commits) set the fetch-depth input to 0:
- uses: actions/checkout@v2
with:
fetch-depth: 0
See the docs.
> When checking out, it is in detached mode
That's irrelevant. Detached HEAD or on branch — if you have 2 commits you can run git diff HEAD~. If you only have 1 commit you cannot — there is no HEAD~.
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