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fix(install): write manifests atomically - #11957
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📝 WalkthroughWalkthroughManifest persistence now uses atomic temporary-file replacement with synchronization, permission preservation, symlink resolution, retry handling, and contextual errors. Empty tool manifests are treated as missing metadata. Tests cover atomic replacement and manifest handling. ChangesManifest persistence
Estimated code review effort: 3 (Moderate) | ~20 minutes Mergeability Score: ⚪ Minimal · up to Manifest updates now replace files atomically, reducing the chance of interrupted installs leaving empty or partial metadata; no actionable merge-blocking risk remains beyond normal checks and review. Sequence Diagram(s)sequenceDiagram
participant InstallState
participant write_atomic
participant Filesystem
InstallState->>write_atomic: write manifest contents
write_atomic->>Filesystem: resolve symlink chain
write_atomic->>Filesystem: create and sync temporary file
write_atomic->>Filesystem: atomically replace manifest
write_atomic->>Filesystem: sync parent directory
Filesystem-->>InstallState: return success or contextual error
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🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Greptile SummaryThe PR introduces an atomic file-replacement helper and applies it to install manifests, while preserving destination symlinks and tolerating empty legacy sidecars.
Confidence Score: 5/5The PR appears safe to merge. No blocking failure remains. Important Files Changed
Reviews (6): Last reviewed commit: "fix(install): write manifests atomically" | Re-trigger Greptile |
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Actionable comments posted: 1
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Inline comments:
In `@src/toolset/install_state.rs`:
- Around line 133-150: In the temporary manifest write flow, move
temporary.as_file_mut().sync_all() to after the conditional set_permissions
call, then call file::sync_dir(parent) immediately after temporary.persist(path)
succeeds. Preserve the existing atomic-write error handling and permission
behavior while ensuring both file contents/metadata and the parent directory
entry are synchronized.
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src/toolset/install_state.rs
Instruction counts
No instruction-count regression above 1%. Only instruction counts gate. Wall clock is shown for context — on identical hardware it moves 4-20% run to run. Measured by tak — instruction-counted CLI benchmarks, stored in this repository's git notes.
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only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
In `@src/file.rs`:
- Around line 377-388: In the temporary-file write flow, move
temporary.as_file_mut().sync_all() from before the Unix set_permissions block to
after permissions are applied and before persist_atomic. Keep persist_atomic
followed by sync_dir(parent) unchanged.
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src/file.rssrc/toolset/install_state.rs
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- src/toolset/install_state.rs
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Inline comments:
In `@src/file.rs`:
- Around line 357-366: Update the symlink target resolution in write_atomic to
support dangling symlinks by resolving the link path without requiring its final
component to exist, reusing desymlink_path if it provides that behavior.
Preserve canonicalization for existing symlink targets and add a regression test
covering a dangling relative symlink.
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src/file.rs
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Summary
file::write_atomichelper that writes beside the destination and atomically replaces itRoot cause
Install manifests used
std::fs::write, which truncates an existing destination before writing its replacement. An interrupted or failed write could therefore leave a zero-byte.mise.backend.toml; concurrent mise processes could also observe the file during the truncate/write window. Deserializing that empty TOML document then reported a missing requiredshortfield.User impact
Interrupted manifest updates can no longer corrupt an existing manifest. Users who already have a zero-byte per-tool sidecar will silently fall back to the consolidated manifest instead of receiving repeated parse warnings. Symlinked manifests continue updating their ultimate targets, including creating missing targets through dangling link chains, instead of having any link replaced.
The atomic-write primitive is available for other ordinary file replacements. Callers with additional policy—fixed secret-file modes, ownership changes, or specialized dangling-symlink behavior—retain their specialized implementations.
Validation
cargo test --locked --bin mise 'file::tests::write_atomic'cargo test --locked --bin mise toolset::install_statehk run check --safe --format json --files0-from -scoped to the changed Rust filesmise run test:e2e e2e/backend/test_install_manifestgit diff --checkAI-assisted — Tool: Codex; model: openai/gpt-5; version: unavailable.
Note
Medium Risk
Touches core install-state persistence and new filesystem semantics (symlinks, permissions, fsync); scope is limited to manifest writes with solid test coverage.
Overview
Install manifests were updated with plain
fs::write, which could truncate files mid-write and leave zero-byte.mise.backend.tomlsidecars that failed TOML parsing.This PR adds
file::write_atomic: write to a temp file in the same directory, fsync, rename into place, sync the parent directory, preserve Unix permissions (or umask for new files), follow symlink chains to the real target without replacing links, and retry transient Windows sharing errors on persist.Install state now uses
write_atomicfor.mise-installs.tomland per-tool.mise.backend.toml. Empty per-tool manifest files are treated as missing so leftover zero-byte files from older interrupted writes fall back to the consolidated manifest instead of parse warnings.Regression tests cover atomic replacement, permissions, symlink cases, and Windows retry behavior.
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