initial, not sure if it works

helpers.go

@@ -0,0 +1,55 @@
+package dcf
+
+import (
+	"os"
+	"path/filepath"
+
+	"github.com/shirou/gopsutil/disk"
+)
+
+func findAllMountPoints() ([]string, error) {
+	mountpoints := []string{}
+	partitions, err := disk.Partitions(false) // physical devices only, so false
+	if err != nil {
+		return nil, err
+	}
+	for _, partition := range partitions {
+		if !contains(mountpoints, partition.Mountpoint) {
+			mountpoints = append(mountpoints, partition.Mountpoint)
+		}
+	}
+	return mountpoints, nil
+}
+
+func findDCFMountPoints() ([]string, error) {
+	filteredMountpoints := []string{}
+	var err error
+	mountpoints, err := findAllMountPoints()
+	if err != nil {
+		return nil, err
+	}
+	for _, mountpoint := range mountpoints {
+		dcimPath := filepath.Join(mountpoint, "DCIM")
+		privatePath := filepath.Join(mountpoint, "PRIVATE")
+		shouldKeep := false
+		if _, err := os.Stat(dcimPath); err == nil {
+			shouldKeep = true
+		}
+		if _, err := os.Stat(privatePath); err == nil {
+			shouldKeep = true
+		}
+		if shouldKeep {
+			filteredMountpoints = append(filteredMountpoints, mountpoint)
+		}
+	}
+	return filteredMountpoints, nil
+}
+
+func contains(slice []string, str string) bool {
+	for _, s := range slice {
+		if s == str {
+			return true
+		}
+	}
+	return false
+}