$ git clone -n https://src.fedoraproject.org/rpms/python-hexdump.git /var/lib/mock/f45-build-30931-648/root/chroot_tmpdir/scmroot/python-hexdump
Cloning into '/var/lib/mock/f45-build-30931-648/root/chroot_tmpdir/scmroot/python-hexdump'...
$ git fetch origin 787f04f5355e15a5d12d0c2a7b14ef520643c131:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-hexdump
 * [new ref]         787f04f5355e15a5d12d0c2a7b14ef520643c131 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 787f04f Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild