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0xDevNinja
cdd3a2f77a
Cherry-picked from #1468 by 0xDevNinja and extended with the hostname-fold migration that codex review surfaced. Pre-fix `deriveCodeSourceId` hashed the absolute repo path alone, so two machines with identical home-dir layouts (chezmoi-managed dotfiles, ansible-provisioned VMs) derived the same id and clobbered each other's `local_path` in a federated brain. Last-writer-wins, with cryptic "Not a git repository" errors on the loser. Hash key is now `\${hostname}::\${path}`. Conductor worktrees on a single host stay distinct (path entropy unchanged within a host); cross-machine federations stop colliding. Migration (D1=B + codex refinements): every existing user has a pre-#1468 path-only-hash source id in their brain that no longer matches what `deriveCodeSourceId` produces. Without migration, the next sync registers a fresh source and orphans the old one. This commit adds: - \`derivePathOnlyHashLegacyId\` — separate helper for the pre-#1468 form. Distinct from \`deriveLegacyCodeSourceId\` (pre-pathhash v1.x form); both probes run. - \`planHostnameFoldMigration\` — feature-checks \`gbrain sources rename <old> <new>\` (exact argument shape, not just \`--help\`), gates on path-drift (skip migration if old source's \`local_path\` differs from current repo root), and falls back to register-new + sync-OK + remove-old when rename is unsupported. As of gbrain 0.35.0.0 the rename subcommand does not exist, so users go through the cleanup path; the rename path stays dormant until gbrain ships it. - \`removeOrphanedSource\` — called only AFTER new-source sync verifies page_count > 0. Closes the data-loss window codex flagged where "register new, remove old before sync" can wipe pages if sync fails. - \`sourceLocalPath\` — looks up a source's \`local_path\` from \`gbrain sources list --json\` for the drift gate. - Helpers accept an optional \`env\` parameter so tests can inject a gbrain shim via PATH without process-wide PATH mutation (Bun's spawnSync doesn't pick up runtime PATH changes). Pre-positions for commit 4's centralized gbrain-exec helper. - \`if (import.meta.main)\` guard around \`main()\` so the helpers can be imported for in-process unit tests. Tests cover: pure derivation, ids-match degenerate case, no-legacy short-circuit, path-drift skip path, rename path with shim, cleanup fallback when rename unsupported, cleanup fallback when rename call itself fails, source-lookup happy/missing/error paths. \`GSTACK_HOSTNAME\` env var is a test-only knob; production uses \`os.hostname()\`. Fixes #1414 Co-Authored-By: Claude <noreply@anthropic.com>