$ git clone -n https://src.fedoraproject.org/rpms/osmium-tool.git /var/lib/mock/f42-build-side-1-3523502-46210/root/chroot_tmpdir/scmroot/osmium-tool
Cloning into '/var/lib/mock/f42-build-side-1-3523502-46210/root/chroot_tmpdir/scmroot/osmium-tool'...
$ git fetch origin a4e9386cb55c8ee01ac0099beb1ba2d575f6437b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/osmium-tool
 * [new ref]         a4e9386cb55c8ee01ac0099beb1ba2d575f6437b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a4e9386 Update to 1.18.0 upstream release