$ git clone -n https://src.fedoraproject.org/rpms/rust-cfb.git /var/lib/mock/f40-build-2091778-50242/root/chroot_tmpdir/scmroot/rust-cfb
Cloning into '/var/lib/mock/f40-build-2091778-50242/root/chroot_tmpdir/scmroot/rust-cfb'...
$ git fetch origin 68877a6479e87235c789dbfa87fc2d32ca828730:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cfb
 * [new ref]         68877a6479e87235c789dbfa87fc2d32ca828730 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 68877a6 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild