$ git clone -n https://src.fedoraproject.org/rpms/golang-github-apapsch-jsonmerge-2.git /var/lib/mock/f45-build-11738-434/root/chroot_tmpdir/scmroot/golang-github-apapsch-jsonmerge-2
Cloning into '/var/lib/mock/f45-build-11738-434/root/chroot_tmpdir/scmroot/golang-github-apapsch-jsonmerge-2'...
$ git fetch origin b8344793b7758df89399bee859c83253ce3497fa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-apapsch-jsonmerge-2
 * [new ref]         b8344793b7758df89399bee859c83253ce3497fa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b834479 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild