$ git clone -n https://src.fedoraproject.org/rpms/ydiff.git /var/lib/mock/f40-build-2333843-59253/root/chroot_tmpdir/scmroot/ydiff
Cloning into '/var/lib/mock/f40-build-2333843-59253/root/chroot_tmpdir/scmroot/ydiff'...
$ git fetch origin 0271d9a242358e162f38a966c1ffae5923f102e6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ydiff
 * [new ref]         0271d9a242358e162f38a966c1ffae5923f102e6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0271d9a Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild