$ git clone -n https://src.fedoraproject.org/rpms/caja-extensions.git /var/lib/mock/f42-build-side-1-3587776-46935/root/chroot_tmpdir/scmroot/caja-extensions
Cloning into '/var/lib/mock/f42-build-side-1-3587776-46935/root/chroot_tmpdir/scmroot/caja-extensions'...
$ git fetch origin 5a366bcdf740c15ac3896e0fb39ef556ca6df7a7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/caja-extensions
 * [new ref]         5a366bcdf740c15ac3896e0fb39ef556ca6df7a7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5a366bc Convert to %autorelease and %autochangelog