golang/go

mime: glob pattern is not expanded

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#52,609 opened on Apr 28, 2022

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Description

What version of Go are you using (go version)?

Does this issue reproduce with the latest release?

Yes.

What operating system and processor architecture are you using (go env)?

What did you do?

package main

import (
        "fmt"
        "mime"
)

func main() {
        exts, _ := mime.ExtensionsByType("video/x-anim")
        fmt.Println(exts)
        typ := mime.TypeByExtension(".anim1")
        fmt.Println(typ)
}

What did you expect to see?

.anim1 .anim2 .anim3 .anim4 .anim5 .anim6 .anim7 .anim8 .anim9 .animj
video/x-anim

What did you see instead?

[.anim[1-9j]]

/usr/share/mime/globs2 has 50:video/x-anim:*.anim[1-9j].

Contributor guide

Research direction
Investigate how the mime package parses glob patterns from the globs2 file and trace the code path to see why patterns like `*.anim[1-9j]` are not expanded into individual extensions. Look at the parsing logic and see if there is a missing expansion step.
Tech stack
go
Domain
backend
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Gomime
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
75