$ git clone -n https://src.fedoraproject.org/rpms/golang-github-otiai10-mint.git /var/lib/mock/f39-build-1512840-35576/root/chroot_tmpdir/scmroot/golang-github-otiai10-mint
Cloning into '/var/lib/mock/f39-build-1512840-35576/root/chroot_tmpdir/scmroot/golang-github-otiai10-mint'...
$ git fetch origin 27079b15afa21746a901e53e98e038093985bd53:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-otiai10-mint
 * [new ref]         27079b15afa21746a901e53e98e038093985bd53 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 27079b1 Update to 1.6.3 - Closes rhbz#2218892