/usr/bin/git-local-commits 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 | #!/bin/sh
ref=$(git symbolic-ref HEAD)
branch=${ref#refs/heads/}
git log origin/${branch}..${branch} $*
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