$ git clone -n https://src.fedoraproject.org/rpms/nomacs.git /var/lib/mock/f42-flatpak-app-build-59152224-6571325/root/chroot_tmpdir/scmroot/nomacs
Cloning into '/var/lib/mock/f42-flatpak-app-build-59152224-6571325/root/chroot_tmpdir/scmroot/nomacs'...
$ git fetch origin 96a33a4a3d94dd882031f17dd03614cb0c9a17c0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nomacs
 * [new ref]         96a33a4a3d94dd882031f17dd03614cb0c9a17c0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 96a33a4 Plugins added