feat(cli): handle non-existent working directories gracefully

[jdx]

Summary

• Shows a warning when mise is run from a non-existent directory
• Allows commands to continue execution despite the missing directory
• Prevents panics and provides helpful context to users

Background

Previously, mise would panic when run from a directory that no longer exists (e.g., after the directory was deleted while the shell was still in it). This could happen when:

• A directory is deleted while a shell session is still active in it
• Running mise from a symlink that no longer resolves
• File system issues cause the current directory to become inaccessible

Changes

1. Added warning in cli/mod.rs: Shows warning after logger initialization
2. Warning message: Shows the problematic directory path (from PWD env var if available)
3. All commands continue: No need to maintain an allowlist of commands
4. Fixed config_root.rs panic: Handle absolutize() failures gracefully
5. Comprehensive e2e test: Added test coverage for various scenarios

Approach

Instead of blocking certain commands or maintaining an allowlist, mise now:

• Shows a warning to inform the user their directory doesn't exist
• Continues execution, allowing commands to work as much as possible
• This is more robust and user-friendly than selective blocking

Test Plan

• Added e2e test test_nonexistent_cwd that tests multiple mise commands
• Manually tested warning appears for all commands
• Verified commands still work despite the warning
• All existing tests pass

Example Warning

mise WARN  Current directory does not exist or is not accessible: /tmp/deleted_dir

Platform Support

• The code is cross-platform (Linux, macOS, Windows)
• The e2e test is bash-based (Unix only), but the functionality works on Windows

🤖 Generated with Claude Code

[Copilot]

Pull Request Overview

This PR adds graceful error handling when mise is run from a non-existent working directory, preventing panics and providing friendly error messages. Previously, mise would panic if the current directory was deleted while a shell session was active in it.

• Added early directory existence check in main.rs with selective command allowlist
• Fixed config_root.rs to handle absolutize() failures gracefully
• Added comprehensive e2e test coverage for various scenarios

Reviewed Changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 2 comments.

File	Description
src/main.rs	Added current directory validation with allowlist for commands that don't require cwd
src/config/config_file/config_root.rs	Changed unwrap_or to unwrap_or_else to handle absolutize failures
e2e/cli/test_nonexistent_cwd	Added comprehensive test script for non-existent directory scenarios

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[Copilot]

The hardcoded command list creates maintenance burden. Consider extracting this into a constant array or method to improve maintainability and make it easier to add new commands that don't require cwd.

[Copilot]

This line duplicates the version check from line 130. The --version/-V flags and version/v subcommands should be consolidated to avoid redundancy.

[github-actions]

Hyperfine Performance

mise x -- echo

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
mise-2025.9.10 x -- echo	19.4 ± 0.5	18.7	24.6	1.00
mise x -- echo	19.6 ± 0.6	18.8	21.8	1.01 ± 0.04

mise env

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
mise-2025.9.10 env	19.0 ± 0.9	18.3	32.9	1.00
mise env	19.1 ± 0.6	18.3	22.9	1.01 ± 0.06

mise hook-env

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
mise-2025.9.10 hook-env	18.7 ± 0.6	17.9	20.3	1.01 ± 0.04
mise hook-env	18.5 ± 0.5	17.9	21.0	1.00

mise ls

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
mise-2025.9.10 ls	16.9 ± 0.7	15.8	18.8	1.03 ± 0.05
mise ls	16.4 ± 0.5	15.8	18.9	1.00

xtasks/test/perf

Command	mise-2025.9.10	mise	Variance
install (cached)	168ms	✅ 104ms	+61%
ls (cached)	63ms	63ms	+0%
bin-paths (cached)	70ms	70ms	+0%
task-ls (cached)	487ms	482ms	+1%

✅ Performance improvement: install cached is 61%