fix: normalize Docker Desktop mount aliases

tools/thothctl/internal/pi/state.go

@@ -136,6 +136,13 @@ func writeFileDurably(path, prefix string, contents []byte) error {
 }
 
 func mountSourceHash(source string) string {
+	source = filepath.Clean(source)
+	for _, dockerDesktopPrefix := range []string{"/host_mnt/private/var/", "/host_mnt/Users/"} {
+		if strings.HasPrefix(source, dockerDesktopPrefix) {
+			source = strings.TrimPrefix(source, "/host_mnt")
+			break
+		}
+	}
 	sum := sha256.Sum256([]byte(source))
 	return fmt.Sprintf("%x", sum[:])
 }

tools/thothctl/internal/pi/update_test.go

@@ -802,6 +802,25 @@ func TestRunningImageCapturesServerBindAndNamedMountIdentity(t *testing.T) {
 	}
 }
 
+func TestDockerDesktopBindAliasesKeepOnePersistenceIdentity(t *testing.T) {
+	for _, paths := range [][2]string{
+		{"/private/var/folders/task/models.json", "/host_mnt/private/var/folders/task/models.json"},
+		{"/Users/operator/thoth/models.json", "/host_mnt/Users/operator/thoth/models.json"},
+	} {
+		left := Mount{Type: "bind", SourceSHA256: mountSourceHash(paths[0]), Destination: "/config/models.json"}
+		right := Mount{Type: "bind", SourceSHA256: mountSourceHash(paths[1]), Destination: "/config/models.json"}
+		if !sameMounts([]Mount{left}, []Mount{right}) {
+			t.Fatalf("Docker Desktop aliases were treated as different mounts: %q and %q", paths[0], paths[1])
+		}
+	}
+
+	left := Mount{Type: "bind", SourceSHA256: mountSourceHash("/srv/thoth/models.json"), Destination: "/config/models.json"}
+	right := Mount{Type: "bind", SourceSHA256: mountSourceHash("/host_mnt/srv/thoth/models.json"), Destination: "/config/models.json"}
+	if sameMounts([]Mount{left}, []Mount{right}) {
+		t.Fatal("an unknown /host_mnt path was collapsed into a distinct Linux bind source")
+	}
+}
+
 func TestCanonicalDigestReferenceRejectsCredentialsAndURLForms(t *testing.T) {
 	valid := "registry.example.invalid/thothii-core@sha256:aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
 	if got, err := canonicalDigestReference(valid); err != nil || got != valid {