$ git clone -n https://src.fedoraproject.org/rpms/xorg-x11-server.git /var/lib/mock/f40-build-2648446-66779/root/chroot_tmpdir/scmroot/xorg-x11-server
Cloning into '/var/lib/mock/f40-build-2648446-66779/root/chroot_tmpdir/scmroot/xorg-x11-server'...
$ git fetch origin c88593e07dcdaae526de35cb6a34ffc50d3ba7b9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xorg-x11-server
 * [new ref]         c88593e07dcdaae526de35cb6a34ffc50d3ba7b9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c88593e Apply all CVE patches to RHEL builds