$ git clone -n https://src.fedoraproject.org/rpms/hgsvn.git /var/lib/mock/f45-build-13417-450/root/chroot_tmpdir/scmroot/hgsvn
Cloning into '/var/lib/mock/f45-build-13417-450/root/chroot_tmpdir/scmroot/hgsvn'...
$ git fetch origin 8259ac41d9962f57303c2ae2a7ab393af8ab2193:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/hgsvn
 * [new ref]         8259ac41d9962f57303c2ae2a7ab393af8ab2193 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8259ac4 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild