$ git clone -n https://src.fedoraproject.org/rpms/golang-github-alecthomas-assert-2.git /var/lib/mock/f40-build-2236222-53493/root/chroot_tmpdir/scmroot/golang-github-alecthomas-assert-2
Cloning into '/var/lib/mock/f40-build-2236222-53493/root/chroot_tmpdir/scmroot/golang-github-alecthomas-assert-2'...
$ git fetch origin d6c84a014012f1b4a1581b686b5f456185856616:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-alecthomas-assert-2
 * [new ref]         d6c84a014012f1b4a1581b686b5f456185856616 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d6c84a0 Add missing source file