continued sd card manager

bsp_q7s/memory/SdCardManager.cpp

@@ -1,5 +1,6 @@
 #include "SdCardManager.h"
 #include "fsfw/ipc/MutexFactory.h"
+#include "fsfw/serviceinterface/ServiceInterface.h"
 
 #include <fstream>
 #include <filesystem>
@@ -35,11 +36,38 @@ ReturnValue_t SdCardManager::switchOffSdCard(sd::SdCard sdCard) {
 }
 
 bool SdCardManager::sdCardActive(sd::SdCard sdCard) {
-    if(std::filesystem::exists("/tmp/sd_status.txt")) {
-        std::ifstream sdStatus("/tmp/sd_status.txt");
-        return HasReturnvaluesIF::RETURN_OK;
+    using namespace std;
+    if(not filesystem::exists("/tmp/sd_status.txt")) {
+        ReturnValue_t result = updateSdCardStateFile();
+        if(result != HasReturnvaluesIF::RETURN_OK) {
+            return result;
+        }
     }
 
+    // Now the file should exist in any case. Still check whether it exists.
+    fstream sdStatus("/tmp/sd_status.txt");
+    if (not sdStatus.good()) {
+        return false;
+    }
+    string line;
+    uint8_t idx = 0;
+    while (std::getline(sdStatus, line)) {
+        istringstream iss(line);
+        string word;
+        if((sdCard == sd::SdCard::SLOT_0 and idx == 0) or
+                (sdCard == sd::SdCard::SLOT_1 and idx == 1)) {
+            while(iss >> word) {
+                if(word == "on") {
+                    return true;
+                }
+                else {
+                    return false;
+                }
+            }
+        }
+        idx++;
+    }
+    return HasReturnvaluesIF::RETURN_OK;
     return false;
 }
 
@@ -51,5 +79,12 @@ void SdCardManager::setPreferredSdCard(sd::SdCard sdCard) {
     preferredSdCard = sdCard;
 }
 
-void SdCardManager::updateSdCardStateFile() {
+ReturnValue_t SdCardManager::updateSdCardStateFile() {
+    int result = std::system("q7hw sd info all > /tmp/sd_status.txt");
+    if(result == 0) {
+        return HasReturnvaluesIF::RETURN_OK;
+    }
+    sif::warning << "SdCardManager::updateSdCardStateFile: system call failed with code " <<
+            result << std::endl;
+    return HasReturnvaluesIF::RETURN_FAILED;
 }

bsp_q7s/memory/SdCardManager.h

@@ -46,7 +46,7 @@ public:
 private:
     SdCardManager();
 
-    void updateSdCardStateFile();
+    ReturnValue_t updateSdCardStateFile();
 
     sd::SdCard preferredSdCard = sd::SdCard::SLOT_0;