$ git clone -n https://src.fedoraproject.org/rpms/krdc.git /var/lib/mock/f40-build-1036793-18696/root/chroot_tmpdir/scmroot/krdc
Cloning into '/var/lib/mock/f40-build-1036793-18696/root/chroot_tmpdir/scmroot/krdc'...
$ git fetch origin b845161cbe3e2a77749b70b562aeb42925ec3f24:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/krdc
 * [new ref]         b845161cbe3e2a77749b70b562aeb42925ec3f24 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b845161 Added VNC connections patch once again