$ git clone -n https://src.fedoraproject.org/rpms/ghc-aeson-yaml.git /var/lib/mock/f45-build-9970-412/root/chroot_tmpdir/scmroot/ghc-aeson-yaml
Cloning into '/var/lib/mock/f45-build-9970-412/root/chroot_tmpdir/scmroot/ghc-aeson-yaml'...
$ git fetch origin 754680834c67ebfb18c22e727322339547a5b0ab:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-aeson-yaml
 * [new ref]         754680834c67ebfb18c22e727322339547a5b0ab -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7546808 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild