initial commit

utils/MountDevice.go

@@ -0,0 +1,55 @@
+package utils
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"syscall"
+)
+
+// mount_device checks if the device is already mounted at MOUNT_POINT,
+// and if not, attempts to mount it as vfat or ext4.
+// Returns 0 on success, -1 on error.
+func MountDevice() int {
+	var DEVICE = os.Getenv("DEVICE")
+	var MOUNT_POINT = os.Getenv("MOUNT_POINT")
+	if EnsureDir(MOUNT_POINT) < 0 {
+		return -1
+	}
+
+	// Check if already mounted
+	f, err := os.Open("/proc/mounts")
+	if err == nil {
+		defer f.Close()
+		scanner := bufio.NewScanner(f)
+		for scanner.Scan() {
+			line := scanner.Text()
+			// Simple substring check (equivalent to strstr)
+			if contains(line, MOUNT_POINT) {
+				return 0
+			}
+		}
+		// Ignore scanner errors for simplicity
+	}
+
+	// Try mounting as vfat, then ext4
+	if err := syscall.Mount(DEVICE, MOUNT_POINT, "vfat", 0, ""); err != nil {
+		if err2 := syscall.Mount(DEVICE, MOUNT_POINT, "ext4", 0, ""); err2 != nil {
+			// Both failed – print error (like perror) and return -1
+			fmt.Fprintf(os.Stderr, "mount: %v (vfat) / %v (ext4)\n", err, err2)
+			return -1
+		}
+	}
+	return 0
+}
+
+func contains(s, substr string) bool {
+	// Simple substring check, equivalent to strstr(s, substr) != NULL
+	// You may also use strings.Contains if imported.
+	for i := 0; i+len(substr) <= len(s); i++ {
+		if s[i:i+len(substr)] == substr {
+			return true
+		}
+	}
+	return false
+}