emscripten-core/emscripten

Files uploading into Virtual File System with -s CASE_INSENSITIVE_FS=1

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#15,245 opened on Oct 6, 2021

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good first bughelp wanted

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Description

Hi, I did some testing experiment with the flag "-s CASE_INSENSITIVE_FS=1" and notice that the virtual file system allows loading of different files of same name but different caps letters. i.e. ABC.txt, AbC.txt."

During opening of both files, regardless of "ABC.txt" or "AbC.txt", the open file would always be the last file of the same name that is loaded. In this case is AbC.txt. I understand this is due to all filenames are converted into lower case names during the lookup of files.

(*edited to make questions more explicit) I have a few questions with regards to the uploading of files behavior:

  1. Why is the case_insensitive flag not applied to uploading file function (function used: "FS_createdDataFile")
  2. Is the case sensitive behavior of uploading file function intended within the case_insensitive virtual file system?

Contributor guide

Research direction
Examine the FS CreateDataFile function and the file lookup logic in the virtual file system to understand why the case insensitive flag is not applied during file creation. Check if this is a known limitation or an oversight.
Tech stack
javascript
Domain
tooling
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.
Mostly clear
Prerequisites
GitEmscripten
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70