SD open(): behavior on missing path on write

[fabianoriccardi]

Hi,

I had noted that SD.open(/path/to/file/, "w") does not create the path to file if missing. I think this behavior is intuitive if you know the underlying implementation fopen, which does not create missing folders. However, I was used to ESP8266 Arduino core (SDFS and SPIFFS), and the common behavior creates any missing path.
Is this an intended behavior or a bug? Is there a parameter to force automatic creation of missing path?

IMHO, create missing path is very intuitive and more suitable for Arduino users.

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[STALE_SET] This issue has been automatically marked as stale because it has not had recent activity. It will be closed in 14 days if no further activity occurs. Thank you for your contributions.

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[Villaquiranm]

Hello @me-no-dev this is marked as closed, but it is still in the To-Do (Seeking Contributors) list.

Do you want someone working on this or this is actually the expected behavior ?

[me-no-dev]

@Villaquiranm seems that Stale BOT closed it. Surely needs work though :)

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[STALE_CLR] This issue has been removed from the stale queue. Please ensure activity to keep it openin the future.

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[STALE_CLR] This issue has been removed from the stale queue. Please ensure activity to keep it openin the future.

[Villaquiranm]

Great @me-no-dev thanks a lot for your response, I would like to start working on this (maybe I'll need some mentoring). For the moment I will try to reproduce, understand the code on the library, and compare it to the ESP8266 Arduino core that the author mentioned.

Just to check
desired behavior: to create all the folders on the path if there are not already present ?

[P-R-O-C-H-Y]

Hello @Villaquiranm and @fabianoriccardi,
in the official Arduino reference of the SD library there is this description of SD.Open().

"Opens a file on the SD card. If the file is opened for writing, it will be created if it doesn't already exist (but the directory containing it must already exist)."

It will create a file if not exist but the directory must already exist.
I checked it and it is acting exactly same as written in Arduino reference and we should stay with the same behavior as the Arduino lib.

Link: https://www.arduino.cc/en/Reference/SDopen

[VojtechBartoska]

@fabianoriccardi PTAL, Is the answer above sufficient?