$ git clone -n https://src.fedoraproject.org/rpms/ghc-xml-hamlet.git /var/lib/mock/f45-build-10981-425/root/chroot_tmpdir/scmroot/ghc-xml-hamlet
Cloning into '/var/lib/mock/f45-build-10981-425/root/chroot_tmpdir/scmroot/ghc-xml-hamlet'...
$ git fetch origin 47872121d85e5362ae70f39a17b873dbd87ab849:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-xml-hamlet
 * [new ref]         47872121d85e5362ae70f39a17b873dbd87ab849 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4787212 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild