docker/contrib/prepare-commit-msg.hook

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#!/bin/sh
# Auto sign all commits to allow them to be used by the Docker project.
# see https://github.com/dotcloud/docker/blob/master/CONTRIBUTING.md#sign-your-work
#
GH_USER=$(git config --get github.user)
SOB=$(git var GIT_AUTHOR_IDENT | sed -n "s/^\(.*>\).*$/Docker-DCO-1.1-Signed-off-by: \1 \(github: $GH_USER\)/p")
grep -qs "^$SOB" "$1" || {
echo
echo "$SOB"
} >> "$1"