$ git clone -n https://src.fedoraproject.org/rpms/mate-screensaver.git /var/lib/mock/f40-build-800278-142890/root/chroot_tmpdir/scmroot/mate-screensaver
Cloning into '/var/lib/mock/f40-build-800278-142890/root/chroot_tmpdir/scmroot/mate-screensaver'...
$ git fetch origin 5a817bd70314cef970acecff716957f44c27f790:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mate-screensaver
 * [new ref]         5a817bd70314cef970acecff716957f44c27f790 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5a817bd update to 1.28.0