Files created without leading / in filename are nowhere

[borisneubert]

Basic Infos

• This issue complies with the issue POLICY doc.
• I have read the documentation at readthedocs and the issue is not addressed there.
• I have tested that the issue is present in current master branch (aka latest git).
• I have searched the issue tracker for a similar issue.
• If there is a stack dump, I have decoded it.
• I have filled out all fields below.

Platform

• Hardware: ESP8266 (NodeMCU 4M)
• Core Version: latest, 2.4.1
• Development Env: Platformio
• Operating System: Ubuntu

Settings in IDE

• Module: Wemos D1 mini
• Flash Mode: dio
• Flash Size: 4MB
• lwip Variant:
• Reset Method:
• Flash Frequency: 40Mhz
• CPU Frequency: 80Mhz
• Upload Using: SERIAL
• Upload Speed: 921600

Problem Description

The documentation states that a filename needs to start with a slash but this is not quite obvious. Trying to open a file for writing whose filename has no leading slash is successful. I can even write to the file, close it and determine its size afterwards. It only does not show up in a directory listing.

Either opening a file whose filename does not start with a leading slash should fail in the first place or the leading slash should be implicitely added.

Code Snippet

String filename= "bar.txt";
File file= SPIFFS.open(filename, "w");
file.write((uint8_t*)buffer, 8);
file.close();

[earlephilhower]

Just did a test and files created without a slash are present in directory lists.

SPIFFS does not have directories, and "openDir(x)" matches the string sent in. A "/" is just another character, not a directory separator.

So a file created as "bar.txt" will not be present in a openDir("/"); listing, but is present if you do openDir("");. If you open("bar.txt", "r"); it opens just fine, too.

Closing as working-as-SPIFFS-is-designed. For real directories, look at the LittleFS or SDFS PRs.