$ git clone -n https://src.fedoraproject.org/rpms/golang-github-sophaskins-efs2tar.git /var/lib/mock/f45-build-12497-442/root/chroot_tmpdir/scmroot/golang-github-sophaskins-efs2tar
Cloning into '/var/lib/mock/f45-build-12497-442/root/chroot_tmpdir/scmroot/golang-github-sophaskins-efs2tar'...
$ git fetch origin 44da627809e6a960f54f26528e100ebf9a3b9dda:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-sophaskins-efs2tar
 * [new ref]         44da627809e6a960f54f26528e100ebf9a3b9dda -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 44da627 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild