$ git clone -n https://src.fedoraproject.org/rpms/libsigc++20.git /var/lib/mock/f40-build-786365-134229/root/chroot_tmpdir/scmroot/libsigc++20
Cloning into '/var/lib/mock/f40-build-786365-134229/root/chroot_tmpdir/scmroot/libsigc++20'...
$ git fetch origin 60aba01cda2cd14cc63f035f722675f953db90d1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libsigc++20
 * [new ref]         60aba01cda2cd14cc63f035f722675f953db90d1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 60aba01 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild