$ git clone -n https://src.fedoraproject.org/rpms/kdegraphics-thumbnailers.git /var/lib/mock/f40-build-2227318-53009/root/chroot_tmpdir/scmroot/kdegraphics-thumbnailers
Cloning into '/var/lib/mock/f40-build-2227318-53009/root/chroot_tmpdir/scmroot/kdegraphics-thumbnailers'...
$ git fetch origin 0f97b2e9a763569048c6ee7247acda4836b9f402:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kdegraphics-thumbnailers
 * [new ref]         0f97b2e9a763569048c6ee7247acda4836b9f402 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0f97b2e Removed leftover logic in %files for kdcraw