git-sync v4 no longer supports abbreviated commit SHA

[nan-yu]

In git-sync v3, --rev can point to an abbreviated commit SHA. git rev-parse <SHORT SHA> works because it clones the repo first. Then git rev-parse is able to parse the full commit hash from the short version.

However, in git-sync v4, git rev-parse is not able to resolve the short commit SHA.

[thockin]

This is true. I should document that. That said, how important is this? To use short SHAs, I have to first get all SHAs and use that to search locally (I could not find a way to do remote listing of short SHA), which makes everything slower and more costly.

For example, if I added a fallback to fetch all SHAs if the --rev flag isn't found, is that really worth the effort vs. telling people to use full SHAs?

[nan-yu]

That said, how important is this?

It's more about avoiding breaking changes to customers. Config Sync uses git-sync. With this change, the upgrade process won't be seamless. They have to update to full SHAs.

I think this seems to be okay if we document it as a breaking change. If they use short SHAs, they only get a git-sync error, but their resources won't be accidentally deleted.

There is another breaking change seems to be more serious. I just filed #841 to track it separately.

[thockin]

I found a similar issue: actions/checkout#265

I have not yet found a way to support short SHAs in remotes.

We could MAYBE do something like --ref=<branch-with-commit> --short-sha=<short> or --ref=<short>@<branch> which triggers git fetch --unshallow <repo> <branch> --filter=blob:none and then git rev-list <short>, but that's MUCH slower than just asking for the full SHA.

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