How to retrieve the hash for the current commit in Git?
How to retrieve the hash for the current commit in Git?
Question
I would like to retain (for now) the ability to link Git changesets to workitems stored in TFS.
I already wrote a tool (using a hook from Git) in which I can inject workitemidentifiers into the message of a Git changeset.
However, I would also like to store the identifier of the Git commit (the hash) into a custom TFS workitem field. This way I can examine a workitem in TFS and see what Git changesets are associated with the workitem.
How can I easily retrieve the hash from the current commit from Git?
Accepted Answer
To turn arbitrary extended object reference into SHA-1, use simply git-rev-parse, for example
git rev-parse HEAD
or
git rev-parse --verify HEAD
You can also retrieve the short version like this
git rev-parse --short HEAD
Sidenote: If you want to turn references (branches and tags) into SHA-1, there is git show-ref and git for-each-ref.
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If you only want the shortened hash:
git log --pretty=format:'%h' -n 1
Further, using %H is another way to get the long hash.
Another one, using git log:
git log -1 --format="%H"
It's very similar to the of @outofculture though a bit shorter.
To get the full SHA:
$ git rev-parse HEAD
cbf1b9a1be984a9f61b79a05f23b19f66d533537
To get the shortened version:
$ git rev-parse --short HEAD
cbf1b9a
For completeness, since no-one has suggested it yet. .git/refs/heads/master is a file that contains only one line: the hash of the latest commit on master. So you could just read it from there.
Or, as as command:
cat .git/refs/heads/master
Update:
Note that git now supports storing some head refs in the pack-ref file instead of as a file in the /refs/heads/ folder. https://www.kernel.org/pub/software/scm/git/docs/git-pack-refs.html
There's always git describe as well. By default it gives you --
[email protected]:/dev/shm/mpd/ncmpc/pkg (master)$ git describe --always
release-0.19-11-g7a68a75