$ git clone -n https://src.fedoraproject.org/rpms/rust.git /var/lib/mock/f40-build-799958-142722/root/chroot_tmpdir/scmroot/rust
Cloning into '/var/lib/mock/f40-build-799958-142722/root/chroot_tmpdir/scmroot/rust'...
$ git fetch origin 15b7bb28e4ba39b27852fa053dd3a3f90003e9a4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust
 * [new ref]         15b7bb28e4ba39b27852fa053dd3a3f90003e9a4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 15b7bb2 Add LLVM 18 compat patches