$ git clone -n https://src.fedoraproject.org/rpms/libsigc++20.git /var/lib/mock/f40-build-2255545-54257/root/chroot_tmpdir/scmroot/libsigc++20
Cloning into '/var/lib/mock/f40-build-2255545-54257/root/chroot_tmpdir/scmroot/libsigc++20'...
$ git fetch origin 6703cfd119d0608c12cbb53ee61047a022e7c6bf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libsigc++20
 * [new ref]         6703cfd119d0608c12cbb53ee61047a022e7c6bf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6703cfd Migrate to SPDX license