$ git clone -n https://src.fedoraproject.org/rpms/ghex.git /var/lib/mock/f40-build-2066598-49285/root/chroot_tmpdir/scmroot/ghex
Cloning into '/var/lib/mock/f40-build-2066598-49285/root/chroot_tmpdir/scmroot/ghex'...
$ git fetch origin 4dc7bb66d7b25fe026d9896a9e8cfc1aeede8344:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghex
 * [new ref]         4dc7bb66d7b25fe026d9896a9e8cfc1aeede8344 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4dc7bb6 Update to 45.1