Re: [PATCH] commit: add commit.signoff config option

On Thu, Jun 25, 2015 at 9:32 AM, Caio Marcelo de Oliveira Filho
[off-list ref] wrote:

In projects that use Signed-off-by, it's convenient to include that line
in the commit by default. The commit.signoff config option allows to add
that line in all commits automatically.

You can use a commit template.

Or you can use the "commit-msg" hook. For example with commands like:

grep "^Signed-off-by:" "$1" ||
echo "Signed-off-by: $(git config user.name) <$(git config user.email)>" >>"$1"

If you have more complex needs, there is also "git interpret-trailers"
(see the examples in the man page).