$ git clone -n https://src.fedoraproject.org/rpms/golang-github-jamesruan-rfc1924.git /var/lib/mock/f38-build-side-42-init-devel-743213-27657/root/chroot_tmpdir/scmroot/golang-github-jamesruan-rfc1924
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-743213-27657/root/chroot_tmpdir/scmroot/golang-github-jamesruan-rfc1924'...
$ git fetch origin 60a5306b0efd9a6c7b6e339cc4a27da31ad71388:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-jamesruan-rfc1924
 * [new ref]         60a5306b0efd9a6c7b6e339cc4a27da31ad71388 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 60a5306 Initial import (#2183854).