Space: what is using a disk, WizTree-style

Pick a disk, not a partition; the scan walks every filesystem it backs, as root when
the host allows, in a helper process that streams the tree back. A tree of folders
largest-first over a treemap of the selected folder, nested to the file and coloured by
kind, plus the thousand largest files. The rail no longer offers the hub-only pages
while a remote machine is being looked at.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

internal/api/server.go

@@ -39,6 +39,7 @@ import (
 	"hamlab/internal/sensors"
 	"hamlab/internal/services"
 	"hamlab/internal/setup"
+	"hamlab/internal/space"
 	"hamlab/internal/storage"
 	"hamlab/internal/store"
 	"hamlab/internal/tasks"
@@ -66,6 +67,7 @@ type Server struct {
 	tasks       *tasks.Manager
 	updates     *updates.Manager
 	storage     *storage.Manager
+	space       *space.Manager
 	fsLocal     files.FS
 	fsSudo      files.FS // nil without passwordless sudo
 	nodes       *nodes.Manager
@@ -83,6 +85,11 @@ type Server struct {
 func New(cfg *config.Config, sessions *auth.Sessions, mgr *term.Manager, col *metrics.Collector, st *store.Store, svc *services.Manager, cr *cron.Manager, tm *tasks.Manager, up *updates.Manager, sto *storage.Manager, fsLocal, fsSudo files.FS, nm *nodes.Manager, fingerprint string, ui fs.FS, version string) *Server {
 	s := &Server{cfg: cfg, sessions: sessions, mgr: mgr, metrics: col, sensors: sensors.NewRegistry(col), store: st, svc: svc, cron: cr, tasks: tm, updates: up, storage: sto, fsLocal: fsLocal, fsSudo: fsSudo, nodes: nm, fingerprint: fingerprint, ui: ui, version: version,
 		started: time.Now(), user: os.Getenv("USER")}
+	if self, err := os.Executable(); err == nil {
+		s.space = space.New(self)
+	} else {
+		s.space = space.New("hamlab")
+	}
 	s.hostName() // read it once now so the first request doesn't have to
 	if u, err := user.Current(); err == nil && u.Username != "" {
 		s.user = u.Username
@@ -249,6 +256,12 @@ func New(cfg *config.Config, sessions *auth.Sessions, mgr *term.Manager, col *me
 	m.HandleFunc("GET /api/storage/zfs/snapshots", s.auth(s.zfsSnapshots))
 	m.HandleFunc("POST /api/storage/zfs/scrub/{pool}/{action}", s.auth(s.zfsScrub))
 	m.HandleFunc("POST /api/storage/zfs/snapshot", s.auth(s.zfsSnapshot))
+	m.HandleFunc("GET /api/space", s.auth(s.spaceOverview))
+	m.HandleFunc("GET /api/space/{disk}", s.auth(s.spaceStatus))
+	m.HandleFunc("POST /api/space/{disk}/scan", s.auth(s.spaceScan))
+	m.HandleFunc("POST /api/space/{disk}/cancel", s.auth(s.spaceCancel))
+	m.HandleFunc("GET /api/space/{disk}/tree", s.auth(s.spaceTree))
+	m.HandleFunc("GET /api/space/{disk}/largest", s.auth(s.spaceLargest))
 	m.HandleFunc("GET /api/procs", s.auth(s.procList))
 	m.HandleFunc("POST /api/procs/{pid}/signal", s.auth(s.procSignal))
 	m.HandleFunc("POST /api/password", s.auth(s.changePassword))