$ git clone -n https://src.fedoraproject.org/rpms/gh.git /var/lib/mock/f42-build-side-1-3587158-46928/root/chroot_tmpdir/scmroot/gh
Cloning into '/var/lib/mock/f42-build-side-1-3587158-46928/root/chroot_tmpdir/scmroot/gh'...
$ git fetch origin b89cdaba86fbb4e4ddf12e3f2c21d01d6f0dabc9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gh
 * [new ref]         b89cdaba86fbb4e4ddf12e3f2c21d01d6f0dabc9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b89cdab Update to 2.75.0 - Closes rhbz#2371496 rhbz#2375605 rhbz#2375620