How to retrieve the hash for the current commit in Git?

Sardaukar picture Sardaukar · Jun 4, 2009 · Viewed 964.9k times · Source

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?

Answer

Jakub Narębski picture Jakub Narębski · Jun 4, 2009

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.