$ git clone -n https://src.fedoraproject.org/rpms/golang-github-emersion-message.git /var/lib/mock/f45-build-11901-436/root/chroot_tmpdir/scmroot/golang-github-emersion-message
Cloning into '/var/lib/mock/f45-build-11901-436/root/chroot_tmpdir/scmroot/golang-github-emersion-message'...
$ git fetch origin 18eaafe1518a7404fb30bfdebd652062425f0b91:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-emersion-message
 * [new ref]         18eaafe1518a7404fb30bfdebd652062425f0b91 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 18eaafe Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild