* fix: use os.Lstat for symlink-safe mtime and permission checks
On NixOS and other systems using symlinks heavily (e.g., home-manager),
os.Stat follows symlinks and returns the target's metadata. This causes:
1. False staleness detection when JSONL is symlinked - mtime of target
changes unpredictably when symlinks are recreated
2. os.Chmod failing or changing wrong file's permissions when target
is in read-only location (e.g., /nix/store)
3. os.Chtimes modifying target's times instead of the symlink itself
Changes:
- autoimport.go: Use Lstat for JSONL mtime in CheckStaleness()
- import.go: Use Lstat in TouchDatabaseFile() for JSONL mtime
- export.go: Skip chmod for symlinked files
- multirepo.go: Use Lstat for JSONL mtime cache
- multirepo_export.go: Use Lstat for mtime, skip chmod for symlinks
- doctor/fix/permissions.go: Skip permission fixes for symlinked paths
These changes are safe cross-platform:
- On systems without symlinks, Lstat behaves identically to Stat
- Symlink permission bits are ignored on Unix anyway
- The extra Lstat syscall overhead is negligible
Fixes symlink-related data loss on NixOS. See GitHub issue #379.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
* test: add symlink behavior tests for NixOS compatibility
Add tests that verify symlink handling behavior:
- TestCheckStaleness_SymlinkedJSONL: verifies mtime detection uses
symlink's own mtime (os.Lstat), not target's mtime (os.Stat)
- TestPermissions_SkipsSymlinkedBeadsDir: verifies chmod is skipped
for symlinked .beads directories
- TestPermissions_SkipsSymlinkedDatabase: verifies chmod is skipped
for symlinked database files while still fixing .beads dir perms
Also adds devShell to flake.nix for local development with go, gopls,
golangci-lint, and sqlite tools.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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Co-authored-by: Claude <noreply@anthropic.com>
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