$ git clone -n https://src.fedoraproject.org/rpms/bookworm.git /var/lib/mock/f40-build-2274752-55026/root/chroot_tmpdir/scmroot/bookworm
Cloning into '/var/lib/mock/f40-build-2274752-55026/root/chroot_tmpdir/scmroot/bookworm'...
$ git fetch origin 6acc1626a60e796a597525d913fc5bf49058f006:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bookworm
 * [new ref]         6acc1626a60e796a597525d913fc5bf49058f006 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6acc162 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild