Git: Find last SHA merged into a branch

user_447744 0
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I have my master branch and a dev branch that I periodically merge to master:

dev      --A---B---C---D---E---F---G--
        /       \       \
master ----------M1------M2----------

M1 and M2 are merge commits.

How can I find the SHA of the last commit on dev that has been merged into master? In this example, I want the SHA of commit D.

merge git
2 Answers

That would be the most recent common ancestor, or merge base :

git merge-base master dev
user_860720

If you never merge to the dev branch you're golden with the git merge-base. If you're merging from master as well, you have to check master's first-parent history for the most recent merge commit whose second parent is in dev's first-parent history.

Brute force:

awk '   ARGIND==1 { tomaster[$NF]=1; next }
        $1 in tomaster { print; exit }
' <(git rev-list --first-parent --merges --parents master) \
  <(git rev-list --first-parent dev)
user_12907310
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