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fix: gazelle failing on Windows with "panic: runtime error: invalid memory address or nil pointer dereference" #1872

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merged 7 commits into from
May 19, 2024
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fix: gazelle failing on Windows with "panic: runtime error: invalid memory address or nil pointer dereference" #1872

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9baee62
Fix "panic: runtime error: invalid memory address or nil pointer dere…
bartoszpop May 1, 2024
515450c
update CHANGELOG
bartoszpop May 1, 2024
8b21ed8
Revert "Fix "panic: runtime error: invalid memory address or nil poin…
bartoszpop May 3, 2024
d074935
Use path not filepath for package parents to fix "panic: runtime erro…
bartoszpop May 3, 2024
dd178b6
Merge branch 'main' into issue-1871
aignas May 19, 2024
bd48e5c
Merge branch 'main' into issue-1871
aignas May 19, 2024
b1f1a7a
move changelog
aignas May 19, 2024
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2 changes: 2 additions & 0 deletions CHANGELOG.md
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Original file line number Diff line number Diff line change
Expand Up @@ -42,6 +42,8 @@ A brief description of the categories of changes:
version dependency select statements when the `experimental_target_platforms`
includes the Python ABI. The default python version case within the select is
also now handled correctly, stabilizing the implementation.
* (gazelle) Fix Gazelle failing on Windows with
"panic: runtime error: invalid memory address or nil pointer dereference"

### Added
* (rules) Precompiling Python source at build time is available. but is
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4 changes: 2 additions & 2 deletions gazelle/pythonconfig/pythonconfig.go
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Expand Up @@ -16,7 +16,7 @@ package pythonconfig

import (
"fmt"
"path/filepath"
"path"
"strings"

"github.com/emirpasic/gods/lists/singlylinkedlist"
Expand Down Expand Up @@ -126,7 +126,7 @@ type Configs map[string]*Config

// ParentForPackage returns the parent Config for the given Bazel package.
func (c *Configs) ParentForPackage(pkg string) *Config {
dir := filepath.Dir(pkg)
dir := path.Dir(pkg)
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Looking at the code, I am not sure it is working the way you think. path.Dir will just split at / if I understand things correctly and filepath.Path is much more sophisticated and I am surprised that this is not working correctly.

I don't have a Windows machine, but the code change looks suspicious.

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@bartoszpop bartoszpop May 13, 2024 •
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@aignas the same issue I have fixed here. My initial approach was to use cfgs[filepath.FromSlash(rel)] but a more targeted fix was proposed in this comment.

Basically, it fails because pythonconfig.go#ParentForPackage delegates to filepath.Dir(pkg) to replace the separator character "\" with "/", hence for a 2-levels deep path, e.g. rootDir\nestedDir1\nestedDir2, a parent is searched with "/" (rootDir/nestedDir1) but Configs contains a key with "\" (rootDir\nestedDir1).

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@aignas aignas May 13, 2024 •
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Ah, I see, thanks for the context, it was much needed here. Could you please rebase and add Changelog notes to the Changelog.md please?

EDIT: Would it be possible to add a test for this?

if dir == "." {
dir = ""
}
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