Make the partition monitored by disk sensor configurable (#50)

Allows to stat partitions other than the root partition

---------

Co-authored-by: Sebastian Zerbe <zerbe@phil.hhu.de>

data/config

@@ -22,6 +22,9 @@ ExitCommand: killall Hyprland
 # The folder, where the battery sensors reside
 BatteryFolder: /sys/class/power_supply/BAT1
 
+# The partition to monitor with disk sensor
+DiskPartition: /
+
 # Overrides the icon of the nth (in this case the first) workspace.
 # Please note the missing space between "," and the symbol. Adding a space here adds it to the bar too!
 #WorkspaceSymbol: 1,

module.nix

@@ -58,6 +58,11 @@ in {
                     default = "/sys/class/power_supply/BAT1";
                     description = "The folder, where the battery sensors reside";
                 };
+                DiskPartition = mkOption {
+                    type = types.str;
+                    default = "/";
+                    description = "The partition to monitor with disk sensor";
+                };
                 WorkspaceSymbols = mkOption {
                     type = types.nullOr (types.listOf types.str);
                     default = [];

src/Bar.cpp

@@ -124,7 +124,7 @@ namespace Bar
         {
             System::DiskInfo info = System::GetDiskInfo();
 
-            std::string text = "Disk: " + Utils::ToStringPrecision(info.usedGiB, "%0.2f") + "GiB/" +
+            std::string text = "Disk " + info.partition + ": " + Utils::ToStringPrecision(info.usedGiB, "%0.2f") + "GiB/" +
                                Utils::ToStringPrecision(info.totalGiB, "%0.2f") + "GiB";
             if (Config::Get().sensorTooltips)
             {

src/Config.cpp

@@ -201,6 +201,7 @@ void Config::Load()
         AddConfigVar("DateTimeStyle", config.dateTimeStyle, lineView, foundProperty);
         AddConfigVar("DateTimeLocale", config.dateTimeLocale, lineView, foundProperty);
         AddConfigVar("CheckPackagesCommand", config.checkPackagesCommand, lineView, foundProperty);
+        AddConfigVar("DiskPartition", config.diskPartition, lineView, foundProperty);
 
         AddConfigVar("CenterTime", config.centerTime, lineView, foundProperty);
         AddConfigVar("AudioInput", config.audioInput, lineView, foundProperty);

src/Config.h

@@ -18,6 +18,7 @@ public:
     std::string defaultWorkspaceSymbol = "";
     std::string dateTimeStyle = "%a %D - %H:%M:%S %Z"; // A sane default
     std::string dateTimeLocale = "";                   // use system locale
+    std::string diskPartition = "/";                   // should be expectable on every linux system
 
     // Script that returns how many packages are out-of-date. The script should only print a number!
     // See data/update.sh for a human-readable version

src/System.cpp

@@ -202,10 +202,12 @@ namespace System
     DiskInfo GetDiskInfo()
     {
         struct statvfs stat;
-        int err = statvfs("/", &stat);
+        std::string partition = Config::Get().diskPartition;
-        ASSERT(err == 0, "Cannot stat root!");
+        int err = statvfs(partition.c_str(), &stat);
+        ASSERT(err == 0, "Cannot stat " + partition + "!");
 
         DiskInfo out{};
+        out.partition = partition;
         out.totalGiB = (double)(stat.f_blocks * stat.f_frsize) / (1024 * 1024 * 1024);
         out.usedGiB = (double)((stat.f_blocks - stat.f_bfree) * stat.f_frsize) / (1024 * 1024 * 1024);
         return out;

src/System.h

@@ -38,6 +38,7 @@ namespace System
 
     struct DiskInfo
     {
+        std::string partition;
         double totalGiB;
         double usedGiB;
     };