git-snap

#!/bin/sh
set -e
# git snap: (re-)commit a snapshot of exactly another commit
# an alternative to 'pick' in git rebase -i: use x git snap <sha>
if [ -z "$1" ]; then
  echo "usage: git snap <commit sha1>"
  exit 1
fi

case `git cat-file -t $1` in
  commit) ;;
  *)
    echo "$1 is not a git commit"
    exit 1
  ;;
esac

SHA=$1
git read-tree $SHA^{tree}
git commit -C $SHA | head -n1
git reset --hard --quiet

Thanks for putting this together. Sorry I'm late to the party, but wouldn't one actually want exit 1 in those failure cases so that interactive rebase pauses rather than silently dropping the commit? :-\

Hi Leo, that's a great idea. I've made the change.