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docs(wt): explain legacy wrapper repair - #45

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asjer merged 10 commits into
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worktree/fix-mise-bootstrap
Aug 14, 2026
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asjer merged 10 commits into
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worktree/fix-mise-bootstrap

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@asjer asjer commented Aug 12, 2026 •

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Summary by CodeRabbit

  • New Features

    • Rails worktree commands now activate mise environments using project, ancestor, and local configuration files.
    • wt update now accepts a specific application path within the current Git repository.
    • Improved environment handling with configuration boundaries and fallback to globally installed executables.
    • Bootstrap scripts now select the appropriate repository or application configuration scope automatically.
  • Documentation

    • Updated installer documentation to explain mise-aware bootstrap behavior.
    • Added troubleshooting steps for repairing legacy wrappers from versions before 0.7.1.

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📒 Files selected for processing (6)
  • README.md
  • lib/generators/rails/worktrees/templates/bin/wt
  • lib/rails/worktrees/post_create_runner.rb
  • spec/rails/worktrees/bin_wt_template_spec.rb
  • spec/rails/worktrees/post_create_runner_spec.rb
  • spec/rails/worktrees/project_maintenance_spec.rb
🚧 Files skipped from review as they are similar to previous changes (3)
  • README.md
  • spec/rails/worktrees/project_maintenance_spec.rb
  • spec/rails/worktrees/bin_wt_template_spec.rb

📝 Walkthrough

Walkthrough

The bin/wt template now selects a repository-scoped mise trust root, sets mise scope variables, and activates mise before Ruby execution. Post-create commands use target-specific mise scope variables. wt update accepts a validated nested application path. Tests and README content cover the new behavior.

Changes

Worktree bootstrap and update flow

Layer / File(s) Summary
Trust and activate mise configuration
lib/generators/rails/worktrees/templates/bin/wt, lib/rails/worktrees/mise_environment.rb, spec/rails/worktrees/bin_wt_template_spec.rb, spec/rails/worktrees/project_maintenance_spec.rb
The wrapper selects the repository root for mise trust, sets MISE_CEILING_PATHS and MISE_TRUSTED_CONFIG_PATHS, and re-executes through mise exec -C before Ruby runs. Tests cover activation order, inherited Git selectors, scope paths, and mise failure.
Resolve target mise scope
lib/rails/worktrees/post_create_runner.rb, spec/rails/worktrees/post_create_runner_spec.rb
Post-create subprocesses merge bootstrapped variables with target-specific mise scope variables. Git root discovery clears inherited Git selectors and validates target containment.
Validate and execute targeted updates
lib/rails/worktrees/command.rb, spec/rails/worktrees/command_spec.rb
wt update accepts an optional path and rejects nonexistent, non-directory, or outside-repository targets. Integration coverage verifies nested app updates.
Document wrapper behavior
README.md
The README documents the mise-aware wrapper, legacy-wrapper repair, ancestor configuration trust, and global executable fallback behavior.

Estimated code review effort: 3 (Moderate) | ~30 minutes

Merge Risk: 🔵 Low · up to 2f7ec

Post-create setup may receive mise trust and ceiling paths for the source checkout rather than the target worktree, potentially leaving newly created worktrees misconfigured. The PR is otherwise mergeable, but this bounded correctness risk needs explicit owner awareness or follow-up.

Sequence Diagram(s)

sequenceDiagram
  participant binwt
  participant mise
  participant Ruby
  binwt->>mise: Set trusted and ceiling configuration paths
  binwt->>mise: Re-execute with mise exec -C WT_APP_ROOT
  mise-->>binwt: Activate the mise environment
  binwt->>Ruby: Run the Ruby script after activation
Loading

Poem

A rabbit checks the mise path,
Then starts Ruby on its track.
Nested apps update in place,
Target scopes stay in their space.
Old wrappers learn the newer way.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name Status Explanation Resolution
Docstring Coverage ⚠️ Warning Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Write docstrings for the functions missing them to satisfy the coverage threshold.
✅ Passed checks (4 passed)
Check name Status Explanation
Description Check ✅ Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Title check ✅ Passed The title accurately describes the documented legacy wrapper repair, but it does not mention the related mise scope and update-path changes.
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.
✨ Finishing Touches 💡 1
📝 Generate docstrings 💡
  • Create stacked PR
  • Commit on current branch
🧪 Generate unit tests (beta)
  • Create PR with unit tests
  • Commit unit tests in branch worktree/fix-mise-bootstrap

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@asjer

asjer commented Aug 12, 2026

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Comment thread README.md Resolved
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@asjer asjer self-assigned this Aug 12, 2026
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Actionable comments posted: 2

🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@lib/generators/rails/worktrees/templates/bin/wt`:
- Around line 65-69: Update the bootstrap block around
wt_trust_mise_config_hierarchy so it captures the exit status of mise env before
eval masks it, aborts when mise env fails, and sets RAILS_WORKTREES_BOOTSTRAPPED
only after the environment export succeeds.

In `@spec/rails/worktrees/bin_wt_template_spec.rb`:
- Around line 204-221: Update the trust expectation setup in the test around
install_ancestor_mise_configs and log_lines so both repo_config_trust and
apps_config_trust construct their paths with File.realpath, matching
WT_APP_ROOT’s physical-path canonicalization while preserving the existing log
ordering assertions.
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  • README.md
  • lib/generators/rails/worktrees/templates/bin/wt
  • spec/rails/worktrees/bin_wt_template_spec.rb
🚧 Files skipped from review as they are similar to previous changes (1)
  • README.md

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@lib/generators/rails/worktrees/templates/bin/wt`:
- Around line 64-66: Replace the hard-coded configuration loop in the worktree
setup with mise-native trust configuration, scoped to the WT_MISE_TRUST_ROOT
environment variable. Remove the partial filename list and invoke mise’s
supported trust behavior so all applicable configuration locations are
discovered.
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📒 Files selected for processing (9)
  • README.md
  • lib/generators/rails/worktrees/templates/bin/wt
  • lib/rails/worktrees/command.rb
  • lib/rails/worktrees/mise_environment.rb
  • lib/rails/worktrees/post_create_runner.rb
  • spec/rails/worktrees/bin_wt_template_spec.rb
  • spec/rails/worktrees/command_spec.rb
  • spec/rails/worktrees/post_create_runner_spec.rb
  • spec/rails/worktrees/project_maintenance_spec.rb
🚧 Files skipped from review as they are similar to previous changes (2)
  • spec/rails/worktrees/bin_wt_template_spec.rb
  • README.md

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Actionable comments posted: 1

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Inline comments:
In `@lib/rails/worktrees/post_create_runner.rb`:
- Around line 161-162: Update PostCreateRunner to derive target-specific
MISE_TRUSTED_CONFIG_PATHS and MISE_CEILING_PATHS from target_dir before
constructing MiseEnvironment and running post-create commands, rather than
forwarding launcher values unchanged. Add a regression test covering distinct
source and target worktrees with an ancestor mise.toml, verifying setup uses the
target worktree’s mise scope.
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  • README.md
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  • lib/rails/worktrees/post_create_runner.rb
  • spec/rails/worktrees/bin_wt_template_spec.rb
  • spec/rails/worktrees/post_create_runner_spec.rb
🚧 Files skipped from review as they are similar to previous changes (3)
  • README.md
  • spec/rails/worktrees/bin_wt_template_spec.rb
  • spec/rails/worktrees/post_create_runner_spec.rb

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WT_MISE_TRUST_ROOT="$WT_APP_ROOT"
if command -v git >/dev/null 2>&1; then
WT_GIT_ROOT="$(unset GIT_DIR GIT_WORK_TREE GIT_COMMON_DIR GIT_INDEX_FILE GIT_OBJECT_DIRECTORY GIT_ALTERNATE_OBJECT_DIRECTORIES; git -C "$WT_APP_ROOT" rev-parse --show-toplevel 2>/dev/null || true)"

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P2 Badge Clear inherited Git discovery ceilings

When a nested Rails app relies on a repository-level mise config and the caller exports GIT_CEILING_DIRECTORIES at or below that repository, this git rev-parse cannot discover the Git root even though the listed repository selectors are unset. The fallback consequently treats the app directory as the trust root, sets the mise ceiling to its parent, and excludes the repository config, so under the documented sparse PATH the wrapper cannot bootstrap its configured Ruby. Fresh evidence beyond the earlier GIT_DIR/GIT_WORK_TREE case is that GIT_CEILING_DIRECTORIES=/repo/apps reproducibly makes discovery from /repo/apps/app fail; clear this discovery control for the lookup as well.

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def update_target_root(repository_root)
return repository_root unless @argv[1]

target_root = canonical_path(File.expand_path(@argv[1], @cwd))

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P2 Badge Validate the explicit update target as a Rails app

When the optional path names any existing directory inside the repository—such as a mistyped apps directory or even .git—this accepts it and ProjectMaintenance treats the missing required files as fixable, causing non-dry-run update to create bin/wt and config/initializers/rails_worktrees.rb there. The analogous explicit setup path verifies bin/rails before proceeding; apply an equivalent Rails-app check here before allowing maintenance writes.

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@asjer
asjer merged commit b3326ab into main Aug 14, 2026
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@asjer
asjer deleted the worktree/fix-mise-bootstrap branch August 14, 2026 16:06
@asjer asjer mentioned this pull request Aug 15, 2026
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