CODEWITHSUNDEEP
gitversion-control
Ferd
Ferd

Reputation: 147

Git: Shallow copies from a specific commit

git clone --depth N ... creates a shallow clone with history limited to the last N revisions and I can use git clone -b tag ... to fetch the commits reachable from tag. However, is there a way to fetch a repository (or a branch thereof) from a specific (tagged) commit up to the branch head?

Say, for example, I'd like to clone only the history starting from a specific release tag. So if the last few commits in the remote look like this

[master]   ...
[master~1] ...
[master~2] ... <-- tag: x.x
[master~3] ...
...

Now I'd like to clone the history range x.x~1.., without having to manually count the number of revisions to give to --depth.

I guess the explanation given in the accepted answer to Why Isn't There A Git Clone Specific Commit Option? applies here as well, so there might not be a direct way.

Upvotes: 3

Views: 1357

Answers (2)

sschuberth
sschuberth

Reputation: 29841

If running at least Git 2.11 on both client and server side, there's a work-around if you know the date of the tagged commit and which branch it is on:

git clone --branch <branch that contains tag> --shallow-since=<date of tagged commit> <url>

Upvotes: 1

torek
torek

Reputation: 488519

Indeed, there is no direct way, and this kind of counting or multiple-ref-based cloning would have to be implemented on the server side (the server delivering the initial shallow clone) for it to work within git's constraints.

There's an indirect way though: start with a depth 1 shallow clone, then deepen repeatedly until the tag appears. Annoyingly, git fetch --depth=<N> won't pick up new tags (but you can use git ls-remote or similar to get everything once on the shallow-clone client, and watch for the SHA-1). But I suspect this method would be so slow as to make it pretty worthless.

Upvotes: 1

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