/usr/bin/git-create-branch is in git-extras 1.9.1-2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | #!/bin/sh
branch=$1
test -z $branch && echo "branch required." 1>&2 && exit 1
git push origin origin:refs/heads/$branch
git fetch origin
git checkout --track -b $branch origin/$branch
git pull
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