$ git clone -n https://src.fedoraproject.org/rpms/geary.git /var/lib/mock/f41-build-851796-166073/root/chroot_tmpdir/scmroot/geary
Cloning into '/var/lib/mock/f41-build-851796-166073/root/chroot_tmpdir/scmroot/geary'...
$ git fetch origin 9ab4e81c249286a630a9be20af6073af2e91b01a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/geary
 * [new ref]         9ab4e81c249286a630a9be20af6073af2e91b01a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9ab4e81 Improve some licenses