Sign git commits with GPG

Question

Is there a way to sign git commits with gpg? It's so easy with tags (using -s instead of -a), it seems there would be a similar function for commits.

Answer 1

git commit -S (requires git >= 1.7.9).

Answer 2

Note: Adding the -S option all the time can be cumbersome.
In git 2.0 and later, you can add a config which will take care of that option for you.

See commit 2af2ef3 by Nicolas Vigier (boklm):

Add the commit.gpgsign option to sign all commits

If you want to GPG sign all your commits, you have to add the -S option all the time.
The commit.gpgsign config option allows to sign all commits automatically.

commit.gpgsign

A boolean to specify whether all commits should be GPG signed.
Use of this option when doing operations such as rebase can result in a large number of commits being signed. It may be convenient to use an agent to avoid typing your GPG passphrase several times.

As Apteryx commented below:

To set this globally on the command line:

git config --global commit.gpgsign true