fix(task): stop pre-converting PATH for POSIX shells; the shell already does it - #12696
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📝 WalkthroughWalkthroughmise no longer converts Windows PATH values for POSIX shells. Shells perform the conversion. The change removes conversion helpers and tests, updates path documentation, and revises Cygwin troubleshooting guidance. ChangesMSYS PATH behavior
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🔵 Low · up to This change correctly delegates PATH conversion to POSIX shells, but the Windows test can fail on systems that expose only WSL bash. Exclude that launcher or align the prerequisite with supported shell resolution before merging. Sequence Diagram(s)sequenceDiagram
participant TaskExecutor
participant Bash
participant PowerShell
TaskExecutor->>Bash: Pass resolved Windows PATH
Bash-->>Bash: Convert PATH for shell commands
Bash->>PowerShell: Spawn native child
PowerShell-->>Bash: Expose semicolon-separated Windows PATH
Suggested reviewers: Poem
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 75.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 16 functions across 3 files. (2 skipped: 2 unsupported.) Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out. Comment |
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Greptile SummaryThe PR removes mise’s pre-conversion of PATH before launching Windows POSIX-shell tasks, allowing Git Bash, MSYS2, and Cygwin to perform their native path translation.
Confidence Score: 5/5The PR appears safe to merge. No blocking failure remains. Important Files Changed
Reviews (7): Last reviewed commit: "fix(task): stop pre-converting PATH for ..." | Re-trigger Greptile |
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Inline comments:
In `@docs/troubleshooting.md`:
- Around line 240-242: Update the PATH guidance in the surrounding
troubleshooting documentation to remove the claim that Cygwin needs no
configuration or automatically converts PATH for native Windows programs. State
that Cygwin processes convert inherited Windows PATH values, while native
programs require explicit conversion such as the established cygpath approach,
and do not associate /etc/fstab mount roots with native PATH handling.
In `@e2e-win/task.Tests.ps1`:
- Line 205: Update both `mise run` invocations that assign `$inBash` and the
corresponding second task result to assert `$LASTEXITCODE` is 0 immediately
after each command, before validating output, so command failures cannot pass
through an empty result.
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Inline comments:
In `@e2e-win/task.Tests.ps1`:
- Line 220: Update the PATH-entry assertion around Should -Match to accept both
drive-letter paths and valid UNC entries beginning with two backslashes, while
continuing to reject invalid forms. Preserve the existing validation behavior
for ordinary Windows paths.
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Inline comments:
In `@e2e-win/task.Tests.ps1`:
- Line 221: Restrict the assertion around $e to MSYS bash by first running a
small bash -c 'uname -o' task through mise and checking the selected shell
reports Msys; skip the test otherwise. Preserve the existing Windows-form PATH
assertion for MSYS and do not add Cygwin behavior.
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…behavior Evidence for jdx#12696, kept until that PR is decided. Runs only these measurements -- not folded into the test suite -- so a run is readable on its own and returns in minutes. Driven from pwsh, never from 'shell: bash': a bash-driven probe is already inside MSYS and measures the wrong parent process. One instrument for every row, so the rows compare. Each (shell, inbound PATH form) pair reports what the shell sees, whether it can find and run a binary from that PATH, what a native grandchild receives -- read twice, by independent readers -- and whether the grandchild can run it. Inbound forms are Windows, the shell's own 'cygpath -u -p' output, and a naive /c/ conversion. Claims are asserted rather than logged, including the negative controls: a pre-converted PATH must break the native round trip, and released 2026.9.0 must reproduce that through 'mise run'. If those fail, the PR's premise is wrong.
…behavior Evidence for jdx#12696, kept until that PR is decided. Runs only these measurements -- not folded into the test suite -- so a run is readable on its own and returns in minutes. Driven from pwsh, never from 'shell: bash': a bash-driven probe is already inside MSYS and measures the wrong parent process. One instrument for every row, so the rows compare. Each (shell, inbound PATH form) pair reports what the shell sees, whether it can find and run a binary from that PATH, what a native grandchild receives -- read twice, by independent readers -- and whether the grandchild can run it. Inbound forms are Windows, the shell's own 'cygpath -u -p' output, and a naive /c/ conversion. Claims are asserted rather than logged, including the negative controls: a pre-converted PATH must break the native round trip, and released 2026.9.0 must reproduce that through 'mise run'. If those fail, the PR's premise is wrong.
…behavior Evidence for jdx#12696, kept until that PR is decided. Runs only these measurements -- not folded into the test suite -- so a run is readable on its own and returns in minutes. Driven from pwsh, never from 'shell: bash': a bash-driven probe is already inside MSYS and measures the wrong parent process. One instrument for every row, so the rows compare. Each (shell, inbound PATH form) pair reports what the shell sees, whether it can find and run a binary from that PATH, what a native grandchild receives -- read twice, by independent readers -- and whether the grandchild can run it. Inbound forms are Windows, the shell's own 'cygpath -u -p' output, and a naive /c/ conversion. Claims are asserted rather than logged, including the negative controls: a pre-converted PATH must break the native round trip, and released 2026.9.0 must reproduce that through 'mise run'. If those fail, the PR's premise is wrong.
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JamBalaya56562
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Inline comments:
In `@e2e-win/task.Tests.ps1`:
- Around line 193-195: Update the prerequisite check in the test containing
Set-ItResult and mise run shell_env to reject the Windows WSL bash.exe launcher,
not merely any command named bash.exe. Detect a usable Git Bash or MSYS shell
consistent with the task executor’s POSIX-shell resolution, and skip the test
when only C:\Windows\System32\bash.exe is available.
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…dy does it mise converted PATH to MSYS Unix form before spawning bash for a task. Measured on CI: the conversion is never needed, and on the shell mise resolves by default it destroys the PATH on the way back out to a native program. A shell that sets MSYSTEM -- `C:\Program Files\Git\bin\bash.exe`, what `bash` resolves to and what mise picks -- prepends its own entries at startup and keeps an inherited POSIX string as one opaque element. 78 entries became 4, the other 73 buried inside one of them, and a native grandchild resolved none of them. Removes maybe_convert_env_for_msys_shell, msys_drive_prefix_for, windows_path_list_to_unix, is_cygwin_shell, MISE_CYGDRIVE_PREFIX and their tests -- the runtime behaviour of jdx#9547, jdx#10147 and jdx#10190. is_posix_shell_program and resolve_posix_shell_program_path stay; both have uses unrelated to PATH conversion. Raised by @cspotcode in jdx#3961. That discussion is about `mise activate`, which this does not touch.
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Updated after measuring this on CI rather than describing it. One claim in the original description was wrong, so I am flagging it here rather than leaving a silent edit. Wrong: "MSYS does not re-parse a POSIX PATH it receives from a native parent." Too broad — the breakage requires the shell to set Measured: run 33701801463 (workflow, what it does and why) — four shells x three inbound PATH forms with no mise, then the same instrument through
@pjeby your correction held up and is now measured in both directions: MSYS rewrites arbitrary environment variables and arguments ( @cspotcode to your original question: no, #9547 was not fixing anything. The half it claimed to fix works unaided on every shell measured; the half it never looked at is the one it broke. Scope: the task spawn path only. AI-assisted — Tool: Claude Code; model: anthropic/claude-opus-5; version: unavailable. |
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Raised by @cspotcode in #3961:
Measured, and the answer is worse than "not fixing anything": on the shell mise resolves by default, the conversion destroys the PATH on the way back out to a native program.
The measurement
A standalone workflow on a throwaway branch, kept until this PR is decided: run 33701801463 (workflow, what it does and why). Both jobs green; the claims are assertions, so green is the evidence.
Four shells — Git Bash
bin\bash.exe, Git Bashusr\bin\bash.exe, MSYS2, Cygwin — against three inbound PATH forms, first with no mise anywhere, then the same instrument driven throughmise runfor released 2026.9.0 (pre-converts) and this branch (does not). One controlled PATH throughout, containing a directory with a space, a UNC entry, and a marker binary that both the shell and a native grandchild are asked to actually run, not merely to see.Driven from pwsh, never from
shell: bash— a bash-driven probe is already inside MSYS and its parent process is the wrong one.What it found
The conversion is what breaks, and only where the shell sets
MSYSTEM.MSYSTEMGit\bin\bash.exeMINGW64Git\usr\bin\bash.exemsys64\usr\bin\bash.exeA shell that sets
MSYSTEMprepends its own entries at startup and keeps the inherited POSIX string as one opaque element, then hands that element through verbatim when it spawns a native child.Get-Command bash.exeand mise's own resolution both land on that shell, so this is the default experience, not a corner case — throughmise run:Passing the Windows form through is lossless on all four shells — every entry arrives, UNC included, the shell sees POSIX form unaided and can run what is on it, and so can a native grandchild.
Why the conversion goes rather than gets fixed
MSYSTEMis unset the conversion changed nothing; where it is set, it was the defect.cygpath -u -prows use the shell's own converter — the best case any implementation could reach — and still lose entries that pass-through keeps:\\zzzserver\zzzshare\bincomes back asD:\zzzserver\zzzshare\bin. Pass-through loses zero.is_posix_shell_programmatched on basename, so a Cygwin bash got Git Bash's/c/...: in that row the shell resolves nothing at all —out_entries=0. @pjeby raised the same shape for WSL'sbash.exe, which wants/mnt/c/....Was #9547 ever fixing anything?
No. Its own description records that the repro was never run — "
pwshrepro … not run locally … Deferred to CI" — and the test CI then ran asserted only that the conversion had happened. The half it claimed to fix (the shell seeing a Unix-form PATH) works unaided on every shell measured; the half it did not look at (what the next native process receives) is the one it broke.What this removes
maybe_convert_env_for_msys_shell,msys_drive_prefix_for,windows_path_list_to_unix,is_cygwin_shell,MISE_CYGDRIVE_PREFIXand their tests — the runtime behaviour of #9547, #10147 and #10190.is_posix_shell_programandresolve_posix_shell_program_pathstay: both have uses unrelated to PATH conversion (command-line construction, and #6513'senv_diffbash lookup). Their doc comments no longer justify themselves by a conversion that is gone.The tests it replaces
Both removed Pester cases asserted that the conversion happened, not that anything worked, and neither could fail while the conversion existed. Their own comment says so:
The replacement asserts both ends of the chain and, because the shape assertions would still hold on a truncated list — which is exactly what the defect produced — it also puts a marker directory on PATH and requires it to arrive at the native grandchild. It pins itself to a shell that sets
MSYSTEMand skips with a reason otherwise, rather than quietly becoming a test that cannot fail.Docs
The Cygwin section said to run
cygpath -pw "$PATH"when a native program cannot resolve something. That is measurably unnecessary — Cygwin hands a native child a Windows-form PATH like the others — so it is gone. In its place, the difference that is real and did cause confusion in review: MSYS rewrites POSIX-looking arguments and non-PATH environment variables on the way to a native program (/cbecomesC:/), while Cygwin leaves both alone. Both halves measured (C7/C8 in the run above).Scope
This is the task spawn path only. #3961 is largely about
mise activateunder Git Bash, which this does not touch and does not claim to fix.AI-assisted — Tool: Claude Code; model: anthropic/claude-opus-5; version: unavailable.
Summary by CodeRabbit
Bug Fixes
Documentation
MISE_BASH_PATH.MSYS_NO_PATHCONV=1for suppressing argument and environment-variable rewriting.