$ git clone -n https://src.fedoraproject.org/rpms/pcb.git /var/lib/mock/f41-build-1045916-19070/root/chroot_tmpdir/scmroot/pcb
Cloning into '/var/lib/mock/f41-build-1045916-19070/root/chroot_tmpdir/scmroot/pcb'...
$ git fetch origin 1a69b66ab21f2376e54c2d123ea779ad0884ecc4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pcb
 * [new ref]         1a69b66ab21f2376e54c2d123ea779ad0884ecc4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1a69b66 Eliminate use of obsolete %patchN syntax (#2283636)