cheatsheets

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git

git is a popular version control system for code.

• git-scm.com - Reference

Cleanup Merged Branches

git branch --merged | grep -P -v "(^\*|master|main)" | xargs git branch -d

Cleanup Merged Branches - Github Workflow Fix

The above will not work for multi-commit branches that are merged via Github “squash + merge” on a PR.

The typical workflow is:

1. Commit changes on local dev branch
2. Push changes to remote Github dev branch (same name)
3. Create Github PR to merge dev branch –> main branch
4. Get LGTM
5. Use Github squash + merge button which also deletes Github dev branch
6. Pull changes into local main
7. Running cleanup merged branches above leaves dev branch :(

The local dev branch doesn’t look like it’s merged because it’s commit hash is not present in the main log due to the squash.

Solution 1:

git fetch -p
branches=$(git for-each-ref --format '%(refname) %(upstream:track)' refs/heads | awk '$2 == "[gone]" {sub("refs/heads/", "", $1); print $1}')
for branch in $branches;
do
  git branch -D $branch
done
git prune origin

Source: Remove tracking branches no longer on remote

Solution 2:

git remote prune origin \
    | git branch  -a \
    | grep -v HEAD \
    | sed 's/remotes\/origin\///g' \
    | sed 's/^\*/ /g' \
    | sort \
    | uniq --count \
    | grep -P "^\s+1\s+" \
    | awk '{print $2}' \
    | xargs -p -L 1 git branch -D

Explanation: Calls git branch -D on any local branch not present on origin.

1. git remote prune origin: deletes local trackers for branches deleted on origin
2. git branch -a: show all tracked branches
3. grep -v HEAD: ignore the HEAD tracker
4. sed 's/remotes\/origin\///g': remove the remotes/origin prefix on the remote trackers
5. sed 's/^\*/ /g': remove the asterisk used to show current branch
6. sort: sort the lines
7. uniq --count: count the number of times each branch name shows up
8. grep -P "^\s+1\s+": filter down to the branches which only occur once (local-only!)
9. awk '{print $2}': filter out the counts
10. xargs -p -L 1 git branch -D:
    • -L 1: for each line of output (branch name)
    • -P: print delete branch command and request y/n prompt
    • git branch -D: delete the branch

Solution 3:

This involves less complexity

# Remove remote/* branches tracked locally that have been deleted on origin.
git remote prune origin

# Show all branches tracked locally
git branch -a

# Force delete any branches which do not have a remote/* version
git branch -D $FOO