git-auto-rebase

#!/bin/bash
## Auto rebase topic branch on another one, look up a specific commit with marker

# Find top commit with a given marker:
# ... === name on base === ...
# Will produce comand like:
#
# git rebase --onto base from
#
# where from commit is parent commit of the marker

MARKER="=== .* ==="
BASE=$(git log --merges -1 --format='%H')

while read HASHSUBJ; do
	COMMIT=${HASHSUBJ%%@*}
	SUBJECT=${HASHSUBJ#*@}

	if [[ $SUBJECT =~ ===\ .*\ === ]]; then
	#if echo "$SUBJECT" | grep -q "$MARKER"; then
		echo "Found marker commit: $SUBJECT"
		top=$(git rev-parse --symbolic --abbrev-ref HEAD)
		assumetop=$(echo "$SUBJECT" | sed -ne 's/.*=== \(.*\) on .* ===.*$/\1/p')
		if [ "$top" != "$assumetop" ]; then
			echo "ERROR: expected branch $assumetop but found $top"
			exit 1
		fi
		onto=$(echo "$SUBJECT" | sed -ne 's/.*=== .* on \(.*\) ===.*$/\1/p')
		from=$(git rev-parse "$COMMIT"^)
		echo git rebase --onto "$onto" "$from"
		echo "Run? [y/n]"
		#read -n 1 q < /dev/tty
		q='y'
		if [ "$q" = 'y' ]; then
			git rebase --onto "$onto" "$from"
		fi
		exit 0
	fi
done < <(git log --format="%H@%s" "$BASE"..HEAD)

echo "No marker commit found"