$ git clone -n https://src.fedoraproject.org/rpms/perl-JSON-RPC-Common.git /var/lib/mock/f45-build-24306-603/root/chroot_tmpdir/scmroot/perl-JSON-RPC-Common
Cloning into '/var/lib/mock/f45-build-24306-603/root/chroot_tmpdir/scmroot/perl-JSON-RPC-Common'...
$ git fetch origin b2d5639cddea97c5db68cc4307f61011c773ce6e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-JSON-RPC-Common
 * [new ref]         b2d5639cddea97c5db68cc4307f61011c773ce6e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b2d5639 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild