I can find the current git branch name by doing either of these:
git branch | awk '/^\*/ { print $2 }' git describe --contains --all HEAD
But when in a detached HEAD state, such as in the post build phase in a Jenkins maven build (or in a Travis git fetch), these commands doesn't work.
My current working solution is this:
git show-ref | grep $(git log --pretty=%h -1) | sed 's|.*/\(.*\)|\1|' | sort -u | grep -v HEAD
It displays any branch name that has the last commit on its HEAD tip. This works fine, but I feel that someone with stronger git-fu might have a prettier solution?
You can view your repository's heads in the path . git/refs/heads/ . In this path you will find one file for each branch, and the content in each file will be the commit ID of the tip (most recent commit) of that branch.
If you check out to the origin (main) branch, which is read-only, you will be in the detached HEAD state. Some other scenarios can cause a detached HEAD as well. For example, checking out to a specific tag name or adding ^0 on any given branch causes the detached HEAD state.
A more porcelain way:
git log -n 1 --pretty=%d HEAD # or equivalently: git show -s --pretty=%d HEAD
The refs will be listed in the format (HEAD, master)
- you'll have to parse it a little bit if you intend to use this in scripts rather than for human consumption.
You could also implement it yourself a little more cleanly:
git for-each-ref --format='%(objectname) %(refname:short)' refs/heads | awk "/^$(git rev-parse HEAD)/ {print \$2}"
with the benefit of getting the candidate refs on separate lines, with no extra characters.
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