$ git clone -n https://src.fedoraproject.org/rpms/golang-github-ravenox-jsonmerge.git /var/lib/mock/f38-build-side-42-init-devel-1416495-31456/root/chroot_tmpdir/scmroot/golang-github-ravenox-jsonmerge
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1416495-31456/root/chroot_tmpdir/scmroot/golang-github-ravenox-jsonmerge'...
$ git fetch origin fc424dd9e79e4a2e360f1d9a9ae96b2393a0d2fd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-ravenox-jsonmerge
 * [new ref]         fc424dd9e79e4a2e360f1d9a9ae96b2393a0d2fd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fc424dd Initial import