$ git clone -n https://src.fedoraproject.org/rpms/libsigc++30.git /var/lib/mock/f40-build-785831-134125/root/chroot_tmpdir/scmroot/libsigc++30
Cloning into '/var/lib/mock/f40-build-785831-134125/root/chroot_tmpdir/scmroot/libsigc++30'...
$ git fetch origin 8b063b9c12cc5747f7551d031efb562fad1a7a48:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libsigc++30
 * [new ref]         8b063b9c12cc5747f7551d031efb562fad1a7a48 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8b063b9 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild