feat: field-sync-gui MVP — Wails GUI ingest SD→local+S3 (4 slots //)

internal/detect/detect.go

@@ -0,0 +1,75 @@
+package detect
+
+import (
+	"path/filepath"
+	"strings"
+
+	"github.com/shirou/gopsutil/v3/disk"
+)
+
+// SDCard represents a detected removable storage device
+type SDCard struct {
+	Mountpoint string   `json:"mountpoint"`
+	Label      string   `json:"label"`
+	Device     string   `json:"device"`
+	Fstype     string   `json:"fstype"`
+	TotalBytes uint64   `json:"totalBytes"`
+	FreeBytes  uint64   `json:"freeBytes"`
+	MediaFiles []string `json:"mediaFiles"`
+}
+
+// mediaExtensions is the set of file extensions we care about
+var mediaExtensions = map[string]bool{
+	".mp4": true, ".mov": true, ".jpg": true, ".jpeg": true,
+	".png": true, ".raw": true, ".gpr": true, ".360": true,
+	".lrv": true, ".thm": true,
+}
+
+// Detect returns all removable partitions that look like SD cards / media
+func Detect() []SDCard {
+	partitions, err := disk.Partitions(true)
+	if err != nil {
+		return nil
+	}
+
+	var cards []SDCard
+	for _, p := range partitions {
+		if !isRemovable(p) {
+			continue
+		}
+		usage, err := disk.Usage(p.Mountpoint)
+		if err != nil {
+			continue
+		}
+		card := SDCard{
+			Mountpoint: p.Mountpoint,
+			Label:      filepath.Base(p.Mountpoint),
+			Device:     p.Device,
+			Fstype:     p.Fstype,
+			TotalBytes: usage.Total,
+			FreeBytes:  usage.Free,
+		}
+		cards = append(cards, card)
+	}
+	return cards
+}
+
+// isRemovable heuristic: opts contain "removable" or path looks like /media/
+func isRemovable(p disk.PartitionStat) bool {
+	opts := strings.Join(p.Opts, ",")
+	if strings.Contains(opts, "removable") {
+		return true
+	}
+	mp := p.Mountpoint
+	if strings.HasPrefix(mp, "/media/") || strings.HasPrefix(mp, "/run/media/") ||
+		strings.HasPrefix(mp, "/Volumes/") || strings.HasPrefix(mp, "/mnt/sd") {
+		return true
+	}
+	return false
+}
+
+// HasMediaExtension returns true if path has a known media extension
+func HasMediaExtension(path string) bool {
+	ext := strings.ToLower(filepath.Ext(path))
+	return mediaExtensions[ext]
+}

internal/detect/detect_test.go

@@ -0,0 +1,25 @@
+package detect
+
+import "testing"
+
+func TestDetectNoPanic(t *testing.T) {
+	cards := Detect()
+	// May be empty in CI — just verify no panic
+	_ = cards
+}
+
+func TestHasMediaExtension(t *testing.T) {
+	cases := map[string]bool{
+		"clip.mp4":  true,
+		"photo.JPG": true,
+		"photo.raw": true,
+		"file.txt":  false,
+		"archive.zip": false,
+	}
+	for path, want := range cases {
+		got := HasMediaExtension(path)
+		if got != want {
+			t.Errorf("HasMediaExtension(%q) = %v, want %v", path, got, want)
+		}
+	}
+}