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Add time to filesystem API (#6544)

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* Add time to filesystem API

Support the ESP32 File::getLastWrite() call and setting the time on
all filesystems automatically (assuming the system clock has
been set properly and time(NULL) returns the proper time!).

Adds Dir::fileTime() to get the time of a file being listed, similar to
Dir::fileName() and Dir::fileSize().

Adds ::setTimeCallback(time_t (*cb)()) to File, Dir, and FS, allowing
users to override the default timestamp on a per-file, directory, or
filesystem basis. By default, a simple callback returning time(nullptr)
is implemented.

LittleFS uses the 't' attribute and should be backwards compatible.

SD/SDFS work and include wrappers for obsolete SdFat timestamp callbacks
using the MSDOS time.

This PR does not update SPIFFS, due to compatability concerns and a
possible massive rewrite which would make it possible to determine if an
old-style ot metadata enabled FS is present at mount time.

Includes an updated SD/listfiles and LittleFS_time example.

Replaces #6315

* Add links to new mklittlefs w/timestamp support

Include the update mklittlefs which generated 't' metadata on imported
files.
	../tools/sdk/lwip2/include/netif/lowpan6_opts.h

* Add explicit note about timestamp being local time

* Address review concerns

Clean up some awkward object instantiations.

Remove the _enableTime flag/setter from SPIFFS.

Clean up the FSConfig constructors using C++ style init lists.
This commit is contained in:
Earle F. Philhower, III
2019-10-31 06:09:52 -07:00
committed by david gauchard
parent b4c28e74d6
commit 72dd589599
12 changed files with 576 additions and 114 deletions
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14
libraries/SD/examples/listfiles/listfiles.ino
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@ -28,14 +28,14 @@ File root;
void setup() {
// Open serial communications and wait for port to open:
Serial.begin(9600);
Serial.begin(115200);
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
}
Serial.print("Initializing SD card...");
if (!SD.begin(4)) {
if (!SD.begin(SS)) {
Serial.println("initialization failed!");
return;
}
@ -70,11 +70,13 @@ void printDirectory(File dir, int numTabs) {
} else {
// files have sizes, directories do not
Serial.print("\t\t");
Serial.println(entry.size(), DEC);
Serial.print(entry.size(), DEC);
Serial.print("\t\t");
time_t ft = entry.getLastWrite();
struct tm *tm = localtime(&ft);
// US format. Feel free to convert to your own locale...
Serial.printf("%02d-%02d-%02d %02d:%02d:%02d\n", tm->tm_mon + 1, tm->tm_mday, tm->tm_year % 100, tm->tm_hour, tm->tm_min, tm->tm_sec);
}
entry.close();
}
}