$ git clone -n https://src.fedoraproject.org/rpms/mingw-libsigc++20.git /var/lib/mock/f39-build-1511633-35544/root/chroot_tmpdir/scmroot/mingw-libsigc++20
Cloning into '/var/lib/mock/f39-build-1511633-35544/root/chroot_tmpdir/scmroot/mingw-libsigc++20'...
$ git fetch origin 13f4724164719d9d1895390841490c8a6cf60269:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mingw-libsigc++20
 * [new ref]         13f4724164719d9d1895390841490c8a6cf60269 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 13f4724 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild