$ git clone -n https://src.fedoraproject.org/rpms/urjtag.git /var/lib/mock/f39-build-1531795-36215/root/chroot_tmpdir/scmroot/urjtag
Cloning into '/var/lib/mock/f39-build-1531795-36215/root/chroot_tmpdir/scmroot/urjtag'...
$ git fetch origin 556c5f2571799415896ed6db6eb1de3932fe2c61:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/urjtag
 * [new ref]         556c5f2571799415896ed6db6eb1de3932fe2c61 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 556c5f2 - Fix FTBFS rhbz#2226495 rhbz#2220616 rhbz#2175186 and rhbz#1785878