[jdx]

Requested by Jeff

https://entire.io/gh/jdx/mise/trails/421

Stacked on mise installs ls/select (and #13951). Adds the explicit operation the identity install layout (#13678) promised for legacy installations: mise never moves them on its own, and now there is a command that does.

Before: with install_layout = "identity", installations made before the layout was turned on stayed in installs/<tool>/<version> forever. The only way to move one was to uninstall and reinstall it by hand, which breaks anything that recorded the old path in between.

After:

$ mise installs migrate --dry-run
would migrate node@20.11.1 from ~/.local/share/mise/installs/node/20.11.1 to ~/.local/share/mise/installs/node-k7m3q2vd
$ mise installs migrate node
migrated node@20.11.1 to ~/.local/share/mise/installs/node-k7m3q2vd
$ readlink ~/.local/share/mise/installs/node/20.11.1
../node-k7m3q2vd

• Each legacy version is reinstalled from its backend into its own <label>-<hash> directory, not copied, so files that record their own path (shebangs, venvs) are written for the new location. Then the old directory is removed and the version link takes its place, so a path that pointed into it (a venv's interpreter, an IDE SDK entry) still resolves. Runtime aliases (20 -> ./20.11.1) keep working through the link.
• The old directory is moved aside while the replacement installs and put back if the install fails. Each migration first writes a journal to installs/.mise/migrations/, records there every installation directory its install is about to write into (once the install holds that directory's lock and has found it must write), and marks itself finished only after the replacement is installed (postinstall included), checked and linked. The old directory is deleted only after that. If a run is killed or fails, the next mise installs migrate puts the old directory back and withdraws exactly what the interrupted run was making, then migrates the version again; an installation it only reused is left alone.
• One version is migrated at a time, under a run-wide lock and the version's lock, so an install with the legacy layout cannot put a directory back where the old one has to return.
• TOOL or TOOL@VERSION arguments narrow it (node@20 names the installed versions that start with 20, as for mise uninstall, and node@latest the newest installed one); with none, every legacy installation moves. --dry-run lists the plan and what an interrupted run left.
• Skipped, with a warning when named: versions whose recorded backend is not what their tool resolves to now (mise isn't using them; uninstall them if unneeded), and tools that keep the legacy layout (http:, rust, dotnet).
• Experimental, and needs the layout on, like the rest of mise installs.

Validation: e2e/cli/test_install_layout_migrate covers the dry run, migrating one version (reinstalled rather than moved, link in place, alias still resolving), a failed reinstall putting the legacy directory back, migrating the rest with no arguments, and recovery from each interrupted state written as a journal. e2e/cli/test_install_layout_migrate_interrupted kills a real migration while its replacement's postinstall runs and checks that the next run undoes and redoes it.

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Note

Medium Risk
The command mutates the install store and reinstalls tools, but uses journals, locks, and rollback paths to limit damage from failures or interrupted runs.

Overview
Adds mise installs migrate (experimental, requires install_layout = "identity") so users can opt in to moving pre-layout installs from installs/<tool>/<version> into hashed identity directories without breaking paths that still point at the old location.

Each migration reinstalls the exact version from its backend (not a file copy), moves the legacy tree aside under a dot name, ensures installs/<tool>/<version> becomes a link to the new install, then removes the old tree. --dry-run prints the plan; optional TOOL@VERSION filters behave like uninstall naming (latest, prefix matching). Skips tools on legacy-only backends and installs whose recorded backend no longer matches the tool.

Crash safety is handled via journals in installs/.mise/migrations/, a global migrate lock, per-version locks, and recover_interrupted on the next run (undo partial work, withdraw directories recorded through a new observe_writes / note_writing hook in the install path). InstallOptions.ignore_tool_config_locked keeps lockfile policy from changing which version gets reinstalled during migrate.

Docs, CLI usage spec, man page, and e2e tests cover dry-run, success/failure rollback, interrupted states, and postinstall interruption.

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Summary by CodeRabbit

• New Features
  • Added mise installs migrate to move eligible legacy installations into the identity install layout. By default, it processes all eligible installations; use --dry-run to preview changes or filter by tool and version.
  • If reinstallation fails, the original installation is restored. Installations that cannot be safely migrated are left untouched, and interrupted migrations can be recovered on a later run.
• Documentation
  • Added command reference, usage examples, and guidance on which installations are eligible for migration.

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📝 Walkthrough

Walkthrough

The pull request adds mise installs migrate to reinstall eligible legacy installations into the identity layout. The command supports dry runs and tool/version filters. It moves each legacy directory aside during reinstallation and restores it if installation fails.

Changes

Legacy installation migration

Layer / File(s)	Summary
Selection and target resolution src/cli/installs/migrate.rs, src/install_layout/resolver.rs	The command accepts optional tool/version filters and a dry-run option. Resolver helpers identify legacy directories, check migration eligibility, and locate or allocate identity-layout targets.
Migration and validation src/cli/installs/migrate.rs, e2e/cli/test_install_layout_migrate	The command moves each legacy directory aside, reinstalls the exact version, and creates a version link after success. It restores the old directory if installation fails. Recovery handles interrupted migrations. End-to-end tests cover dry runs, filtered and default migrations, failures, recovery, and an existing identity-layout installation.
Command registration and references src/cli/installs/mod.rs, src/cli/command_effects.rs, docs/.vitepress/cli_commands.ts, docs/cli/installs.md, docs/cli/installs/migrate.md, docs/dev-tools/install-layout.md, docs/public/llms.txt, man/man1/mise.1, mise.usage.kdl	Registers mise installs migrate, classifies it as a write command, and adds CLI and install-layout documentation. The references describe filters, dry runs, backend mismatch handling, and tools that retain the legacy layout.

Priority: ⬇️ Low

Estimated code review effort: 4 (Complex) | ~45 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant InstallsMigrate
  participant Resolver
  participant ToolVersionInstall
  participant Filesystem
  InstallsMigrate->>Resolver: Resolve eligibility and migration target
  Resolver-->>InstallsMigrate: Return target or skip reason
  InstallsMigrate->>Filesystem: Move legacy directory aside
  InstallsMigrate->>ToolVersionInstall: Reinstall exact installed version
  ToolVersionInstall-->>InstallsMigrate: Return installation result
  alt Installation succeeds
    InstallsMigrate->>Filesystem: Replace aside directory with version link
  else Installation fails
    InstallsMigrate->>Filesystem: Restore legacy directory
  end

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Merge Risk: 🟡 Moderate · up to 159c5

Migration can fail for a selected version, and recovery after an interruption can break links to an existing installation. Address both paths before merging.

Security Architecture Review

Security architecture risk: 🟡 Moderate · up to 159c5

Ordinary migration failures preserve the previous installation, but interrupted recovery can withdraw an existing installation shared by other tools or users. Cleanup failure can also cause a later rollback after migration was reported successful. These risks are bounded by explicit invocation and filesystem permissions.

Retained concerns

• Medium · security · inferred: Interrupted recovery does not establish ownership of the replacement before withdrawing it. A migration may reuse an already complete identity installation, including one in a configured shared root. If interrupted after linking but before marking completion, recovery removes that target's receipt and matching compatibility links in its owning root, then restores only this migration's legacy backup. Other consumers can therefore lose a previously valid installation. Shared-root mutation succeeds only where filesystem permissions permit it, but bypasses the normal installer's logical read-only policy. Recovery runs before tool filters, so a later invocation naming another tool can trigger the withdrawal.
• Medium · reliability · inferred: The successful migration branch continues destructive backup cleanup when the rename to the finished marker fails. If cleanup fails or is interrupted, the remaining backup still carries the unfinished marker, despite the replacement having been verified and migration potentially having reported success. A subsequent run withdraws the replacement and restores this backup, which recursive deletion may already have partially removed. Post-commit cleanup can therefore become a later rollback to incomplete installation data.

Security review details

Security Blast Radius

• inferred — Normal migration selects the invoking user's primary-root legacy installations. Recovery can additionally withdraw a reused identity target in a configured shared root and affect its other consumers where the process has write permission. The inspected path does not grant additional operating-system privilege; the exposure is unintended use of existing filesystem authority.

Security Findings and Attack Paths

• inferred — The supported failure path requires a reused replacement, interruption before the finished marker, and a subsequent migration invocation. Recovery then treats the existing target as migration-owned and withdraws it. This is a cross-consumer ownership and availability concern; no remote attacker-controlled entrypoint or privilege-escalation path was established.

Trust Boundaries and Controls

• observed — Explicit command gates, primary-root legacy checks, recorded-backend mismatch rejection, and normal backend installer controls constrain initiation. The normal installer preserves satisfied shared-root installations and redirects incompatible writes into the primary root. These controls do not establish replacement ownership for interrupted recovery.

Resilience and Maintainability Implications

• inferred — Recovery correctness depends on the backup suffix remaining an accurate commit-state indicator. Deleting an unmarked backup after marker persistence fails breaks that invariant and permits later recovery to replace the verified installation with partially deleted data.

Hardening Proposals

• proposed — Persist migration-specific target ownership and commit state before destructive cleanup. Recovery should preserve reused and shared installations, withdraw only newly created migration-owned targets under appropriate locks, and never treat a partially cleaned committed backup as eligible for rollback.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	Docstring coverage is 80.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 15 functions across 5 files. (1 skipped: 1 …
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: migrating legacy installations into the identity layout.

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Confidence Score: 5/5

[Medium risk] Adds a command to move tool installations between directory layouts.

The PR appears safe to merge, with no new actionable findings.

Summary

Adds mise installs migrate to reinstall legacy tools into the identity layout while keeping their old paths working through links.

• Records replacement writes before they happen and keeps recovery journals until migration finishes.
• Restores legacy directories when migration fails or is interrupted.
• The latest change checks configured dependencies before recording replacement writes. No new actionable issue was found.

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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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Inline comments:
Review comments at @src/cli/installs/migrate.rs:
- Around line 114-172: Update reinstall and migrate so the migration request is
pinned to the concrete version captured by the listed ToolVersion, rather than
replaying its floating request; preserve the original install options when
constructing the request. Ensure installation_of resolves the same version as
the moved legacy directory.

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• mise.usage.kdl
• src/cli/command_effects.rs
• src/cli/installs/migrate.rs
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• 🪄 Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at @src/install_layout/resolver.rs:
- Around line 1598-1599: In the migration path around `locate`, verify that the
compatibility link at the legacy path resolves to the migrated installation
before deleting the aside. If it does not, restore the legacy directory and
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src/cli/installs/migrate.rs (1)

173-180: 🎯 Functional Correctness | 🟡 Minor | ⚡ Quick win

Pin the reinstall request to the captured concrete version.

request.request keeps the original floating request, for example a configured latest or a prefix. If that request now resolves to a newer version, the reinstall installs and catalogs the newer version. installation_of(&request) then either fails or returns the wrong installation. The failure branch restores the legacy directory, but the newer identity installation stays in the catalog. Migration then reports an error for a version that was never reinstalled.

Build the request from tv.version, and keep the install options from the original request. This follows the existing past review comment on this code.

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Review comment at @src/cli/installs/migrate.rs around lines 173 - 180:
Update the request passed to ts.install_all_versions to use the captured
concrete version from tv.version instead of the original floating request;
preserve the install options from the original request.

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Duplicate comments:
Review comments at @src/cli/installs/migrate.rs:
- Around line 173-180: Update the request passed to ts.install_all_versions to
use the captured concrete version from tv.version instead of the original
floating request; preserve the install options from the original request.

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Inline comments:
Review comments at @src/cli/installs/migrate.rs:
- Around line 321-351: Update InstallOptions in reinstall to disable
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- Around line 199-207: Update the recovery branch in InstallsMigrate::run to
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[github-actions]

Instruction counts

Nothing was compared, and so nothing was gated. No series appears on both sides: either the base has no measurements recorded, or the two were measured on different runner classes, which are deliberately not comparable — counts shift between machine types by more than a real regression does.

New, nothing to compare against: env on jdx-perf-v1-ubuntu24.04-x64-mise-rust1.97.1-img5263c143, hook-env on jdx-perf-v1-ubuntu24.04-x64-mise-rust1.97.1-img5263c143, ls on jdx-perf-v1-ubuntu24.04-x64-mise-rust1.97.1-img5263c143, registry on jdx-perf-v1-ubuntu24.04-x64-mise-rust1.97.1-img5263c143, startup on jdx-perf-v1-ubuntu24.04-x64-mise-rust1.97.1-img5263c143

_{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.}

_{a05df117b499 vs d3bc9aa9b788 · measured on the runner, not pushed to the history.}