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#!/bin/bash
# git-oldest-ancestor
#
# Finds the branch point of the current HEAD.
#
# From lindes (https://stackoverflow.com/users/313756/lindes) on Stack Overflow
# https://stackoverflow.com/questions/1527234/finding-a-branch-point-with-git/4991675#4991675
# https://stackoverflow.com/questions/1527234/finding-a-branch-point-with-git/4991675#comment42897586_4991675
diff \
--old-line-format='' \
--new-line-format='' \
<(git rev-list --first-parent "${1:-master}") \
<(git rev-list --first-parent "${2:-HEAD}") |
head -1
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