Be sure your commit is Signed off by

In order for your contributed code to be included, it needs to be "Signed-off". More info about it are available in file CONTRIBUTING.md

Signing off is (and should be!) a manual operation and therefore easy to forget. You can tell git to help you checking if it's missing: it will warn you when adding a commit that is not signed off (or has duplicate signoff lines).

Create file REPO/.git/hooks/post-commit and give it executable permissions. Paste the following code into it:

#!/bin/sh
if git log --format=%B -n 1 HEAD | grep '^Signed-off-by: ' | sort | uniq --repeated | grep . > /dev/null; then
    echo >&2 ''
    echo >&2 '  *******************************************'
    echo >&2 '  * WARNING: Duplicate Signed-off-by lines! *'
    echo >&2 '  * Use "git commit --amend to fix.         *'
    echo >&2 '  *******************************************'
    echo >&2 ''
fi

if ! git log --format=%B -n 1 HEAD | grep '^Signed-off-by: '; then
    echo >&2 ''
    echo >&2 '  **********************************************************'
    echo >&2 '  * WARNING: Missing Signed-off-by line, forgot --signoff? *'
    echo >&2 '  * Use "git commit --amend --signoff" to fix.             *'
    echo >&2 '  **********************************************************'
    echo >&2 ''
fi