LittleFS: add reading FS creation time

Author: qistoph

cores/esp8266/FS.cpp

@@ -441,6 +441,13 @@ bool FS::rename(const String& pathFrom, const String& pathTo) {
     return rename(pathFrom.c_str(), pathTo.c_str());
 }
 
+time_t FS::getCreationTime() {
+    if (!_impl) {
+        return 0;
+    }
+    return _impl->getCreationTime();
+}
+
 void FS::setTimeCallback(time_t (*cb)(void)) {
     if (!_impl)
         return;

cores/esp8266/FS.h

@@ -235,6 +235,8 @@ class FS
     bool gc();
     bool check();
 
+    time_t getCreationTime();
+
     void setTimeCallback(time_t (*cb)(void));
 
     friend class ::SDClass; // More of a frenemy, but SD needs internal implementation to get private FAT bits

cores/esp8266/FSImpl.h

@@ -115,6 +115,7 @@ class FSImpl {
     virtual bool rmdir(const char* path) = 0;
     virtual bool gc() { return true; } // May not be implemented in all file systems.
     virtual bool check() { return true; } // May not be implemented in all file systems.
+    virtual time_t getCreationTime() { return -1; } // May not be implemented in all file systems.
 
     // Filesystems *may* support a timestamp per-file, so allow the user to override with
     // their own callback for all files on this FS.  The default implementation simply

libraries/LittleFS/src/LittleFS.h

@@ -228,6 +228,19 @@ class LittleFSImpl : public FSImpl
         return true;
     }
 
+    time_t getCreationTime() override {
+        time_t t;
+        uint32_t t32b;
+
+        if (lfs_getattr(&_lfs, "/", 'c', &t, 8) == 8) {
+            return t;
+        } else if (lfs_getattr(&_lfs, "/", 'c', &t32b, 4) == 4) {
+            return (time_t)t32b;
+        } else {
+            return 0;
+        }
+    }
+
 
 protected:
     friend class LittleFSFileImpl;