$ git clone -n https://src.fedoraproject.org/rpms/iwd.git /var/lib/mock/f42-build-60960445-6586790/root/chroot_tmpdir/scmroot/iwd
Cloning into '/var/lib/mock/f42-build-60960445-6586790/root/chroot_tmpdir/scmroot/iwd'...
$ git fetch origin 684fd78bc958fe35c86b71574349d14d4caf93cd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/iwd
 * [new ref]         684fd78bc958fe35c86b71574349d14d4caf93cd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 684fd78 Update to 3.9