$ git clone -n https://src.fedoraproject.org/rpms/libsigc++30.git /var/lib/mock/f40-build-2008404-45370/root/chroot_tmpdir/scmroot/libsigc++30
Cloning into '/var/lib/mock/f40-build-2008404-45370/root/chroot_tmpdir/scmroot/libsigc++30'...
$ git fetch origin 1c6b1cfeeed741eeb03ca232667592885f8b68da:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libsigc++30
 * [new ref]         1c6b1cfeeed741eeb03ca232667592885f8b68da -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1c6b1cf Fix NEWS file to not be executable