$ git clone -n https://src.fedoraproject.org/rpms/tomboy.git /var/lib/mock/f41-build-1072448-19725/root/chroot_tmpdir/scmroot/tomboy
Cloning into '/var/lib/mock/f41-build-1072448-19725/root/chroot_tmpdir/scmroot/tomboy'...
$ git fetch origin e6f37da8229108f062222f4e7677a9964e8c7379:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tomboy
 * [new ref]         e6f37da8229108f062222f4e7677a9964e8c7379 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e6f37da Eliminate use of obsolete %patchN syntax (#2283636)