$ git clone -n https://src.fedoraproject.org/rpms/bookworm.git /var/lib/mock/f40-build-2692433-68207/root/chroot_tmpdir/scmroot/bookworm
Cloning into '/var/lib/mock/f40-build-2692433-68207/root/chroot_tmpdir/scmroot/bookworm'...
$ git fetch origin 2ebcae59201f9a78ff001d21cb00b23cb6d88d34:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bookworm
 * [new ref]         2ebcae59201f9a78ff001d21cb00b23cb6d88d34 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2ebcae5 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild