Every config.toml writer wrote a tmp beside the path and renamed it over
the path. With config.toml symlinked into a dotfiles repo, the rename
replaced the link with a regular file: the repo copy went stale and the
link was gone.
`config_write_dest` resolves the destination before a writer names its
tmp. For the user's own config path a symlink resolves to its referent,
so the tmp sits on the referent's filesystem and the rename stays atomic.
A dangling link is an error, not a clobber. All eight writers call it:
`save_config`, the four MCP writers, and the three import writers.
Only the user's config path is followed, and only while
`user_kigi_home()` resolves. `kigi mcp add --scope project` and the
Claude project import write `.kigi/config.toml` inside the repo; a
hostile repo could ship that file as a symlink to any file the user
owns. With no home, `kigi_home()` falls back to `./.kigi`, which is that
same project tree, so nothing is followed then. Untrusted paths come
back unchanged and the link itself is replaced, as before. AGENTS.md
records the rule.
Tests (unix; run on Linux under WSL): helper cases including the no-home
case, a project-scope save that spares the link's target, and an
end-to-end save under KIGI_SHARE_DIR. The end-to-end test fails with
following disabled. Windows symlinks were not exercised: the host lacks
the privilege.
Ported from upstream (grok-build config/fs_atomic.rs LeafSymlink::Follow,
1.0.35): the rule, not the 1375-line module.
Sweep every first-party crate source (1956 .rs files) to the project comment
guidelines: delete redundant restatements, decorative banners, change
narration, and end-of-line comments; keep and tighten the crucial ones
(invariants, bug rationale, SAFETY blocks, ported-source attribution).
No functional code changed. Every edit is proven comment-only against the
prior tree by a comment-stripping lexer (string/char/raw-string aware) plus a
separate doctest-fence check. Where removing a comment made rustfmt or clippy
want to re-lay-out adjacent code, the minimal triggering comment is restored so
code tokens stay byte-identical.
Gates green: cargo fmt --all --check (0 diffs), cargo check and cargo clippy
--workspace --all-targets (0 warnings).
Adds scripts/check_codegen_comment_guidelines.py — the enforcement gate for
these guidelines (flags banners, end-of-line comments, change narration, and
commented-out code).
ZacharyZhang-NY