$ git clone -n https://src.fedoraproject.org/rpms/rubygem-haml.git /var/lib/mock/f45-build-34945-692/root/chroot_tmpdir/scmroot/rubygem-haml
Cloning into '/var/lib/mock/f45-build-34945-692/root/chroot_tmpdir/scmroot/rubygem-haml'...
$ git fetch origin fbc3ac9d7efff9ae047eedfa4d421859c3c18042:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-haml
 * [new ref]         fbc3ac9d7efff9ae047eedfa4d421859c3c18042 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fbc3ac9 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild