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Fix checkout of annotated tag loosing annotation

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Currently, a check is done after fetch to ensure that the repo state has
not changed since the workflow was triggered. This check will reset the
checkout to the commit that triggered the workflow, even if the branch
or tag has moved since.

The issue is that the check currently sees what "object" the ref points
to. For an annotated tag, that is the annotation, not the commit. This
means the check always fails for annotated tags, and they are reset to
the commit, losing the annotation. Losing the annotation can be fatal,
as `git describe` will only match annotated tags.

The fix is simple: check if the tag points at the right commit, ignoring
any other type of object. This is done with the <rev>^{commit} syntax.

From the git-rev-parse docs:
> <rev>^{<type>}, e.g. v0.99.8^{commit}
>  A suffix ^ followed by an object type name enclosed in brace pair
>  means dereference the object at <rev> recursively until an object of
>  type <type> is found or the object cannot be dereferenced anymore (in
>  which case, barf). For example, if <rev> is a commit-ish,
>  <rev>^{commit} describes the corresponding commit object. Similarly,
>  if <rev> is a tree-ish, <rev>^{tree} describes the corresponding tree
>  object.  <rev>^0 is a short-hand for <rev>^{commit}.

If the check still fails, we will still reset the tag to the commit,
losing the annotation. However, there is no way to truly recover in this
situtation, as GitHub does not capture the annotation on workflow start,
and since the history has changed, we can not trust the new tag to
contain the same data as it did before.

Fixes #290
Closes #697
This commit is contained in:
Mark Vander Stel 2023-10-06 12:40:07 -04:00
parent 8ade135a41
commit 1d3fa26c9e
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2 changed files with 4 additions and 2 deletions
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3
dist/index.js vendored
View file

@ -2059,7 +2059,8 @@ function testRef(git, ref, commit) {
// refs/tags/
else if (upperRef.startsWith('REFS/TAGS/')) {
const tagName = ref.substring('refs/tags/'.length);
return ((yield git.tagExists(tagName)) && commit === (yield git.revParse(ref)));
return ((yield git.tagExists(tagName)) &&
commit === (yield git.revParse(`${ref}^{commit}`)));
}
// Unexpected
else {

3
src/ref-helper.ts
View file

@ -167,7 +167,8 @@ export async function testRef(
else if (upperRef.startsWith('REFS/TAGS/')) {
const tagName = ref.substring('refs/tags/'.length)
return (
(await git.tagExists(tagName)) && commit === (await git.revParse(ref))
(await git.tagExists(tagName)) &&
commit === (await git.revParse(`${ref}^{commit}`))
)
}
// Unexpected