$ git clone -n https://src.fedoraproject.org/rpms/golang-github-valyala-fastjson.git /var/lib/mock/f40-build-2002434-44714/root/chroot_tmpdir/scmroot/golang-github-valyala-fastjson
Cloning into '/var/lib/mock/f40-build-2002434-44714/root/chroot_tmpdir/scmroot/golang-github-valyala-fastjson'...
$ git fetch origin 832dbe621564d0d85fa7d8e13c22ca9adec64bda:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-valyala-fastjson
 * [new ref]         832dbe621564d0d85fa7d8e13c22ca9adec64bda -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 832dbe6 Initial import