$ git clone -n https://src.fedoraproject.org/rpms/golang-github-shurcool-vfsgen.git /var/lib/mock/f45-build-12479-442/root/chroot_tmpdir/scmroot/golang-github-shurcool-vfsgen
Cloning into '/var/lib/mock/f45-build-12479-442/root/chroot_tmpdir/scmroot/golang-github-shurcool-vfsgen'...
$ git fetch origin 1b12d47b4f5f2a564633ab21c0eb8ab4250d7bab:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-shurcool-vfsgen
 * [new ref]         1b12d47b4f5f2a564633ab21c0eb8ab4250d7bab -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1b12d47 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild