Bug 1756083 - Cleanup snap name handling and enable portal when running under either flatpak or snap. r=stransky

Differential Revision: https://phabricator.services.mozilla.com/D139474

browser/components/shell/nsGNOMEShellService.cpp

@@ -24,6 +24,7 @@
 #include "imgIContainer.h"
 #include "mozilla/Sprintf.h"
 #include "mozilla/WidgetUtils.h"
+#include "mozilla/WidgetUtilsGtk.h"
 #include "mozilla/dom/Element.h"
 #if defined(MOZ_WIDGET_GTK)
 #  include "nsImageToPixbuf.h"
@@ -72,18 +73,6 @@ static const MimeTypeAssociation appTypes[] = {
 #define kDesktopDrawBGGSKey "draw-background"
 #define kDesktopColorGSKey "primary-color"
 
-static bool IsRunningAsASnap() {
-  const char* snapName = mozilla::widget::WidgetUtils::GetSnapInstanceName();
-
-  // return early if not set.
-  if (snapName == nullptr) {
-    return false;
-  }
-
-  // snapName as defined on https://snapcraft.io/firefox
-  return (strcmp(snapName, "firefox") == 0);
-}
-
 nsresult nsGNOMEShellService::Init() {
   nsresult rv;
 
@@ -200,9 +189,9 @@ nsGNOMEShellService::IsDefaultBrowser(bool aForAllTypes,
                                       bool* aIsDefaultBrowser) {
   *aIsDefaultBrowser = false;
 
-  if (IsRunningAsASnap()) {
+  if (widget::IsRunningUnderSnap()) {
     const gchar* argv[] = {"xdg-settings", "check", "default-web-browser",
-                           "firefox.desktop", nullptr};
+                           (SNAP_INSTANCE_NAME ".desktop"), nullptr};
     GSpawnFlags flags = static_cast<GSpawnFlags>(G_SPAWN_SEARCH_PATH |
                                                  G_SPAWN_STDERR_TO_DEV_NULL);
     gchar* output = nullptr;
@@ -280,9 +269,9 @@ nsGNOMEShellService::SetDefaultBrowser(bool aClaimAllTypes, bool aForAllUsers) {
         "Setting the default browser for all users is not yet supported");
 #endif
 
-  if (IsRunningAsASnap()) {
+  if (widget::IsRunningUnderSnap()) {
     const gchar* argv[] = {"xdg-settings", "set", "default-web-browser",
-                           "firefox.desktop", nullptr};
+                           (SNAP_INSTANCE_NAME ".desktop"), nullptr};
     GSpawnFlags flags = static_cast<GSpawnFlags>(G_SPAWN_SEARCH_PATH |
                                                  G_SPAWN_STDOUT_TO_DEV_NULL |
                                                  G_SPAWN_STDERR_TO_DEV_NULL);

toolkit/profile/nsToolkitProfileService.cpp

@@ -33,6 +33,10 @@
 #  include "nsILocalFileMac.h"
 #endif
 
+#ifdef MOZ_WIDGET_GTK
+#include "mozilla/WidgetUtilsGtk.h"
+#endif
+
 #include "nsAppDirectoryServiceDefs.h"
 #include "nsDirectoryServiceDefs.h"
 #include "nsNetCID.h"
@@ -1906,16 +1910,11 @@ nsToolkitProfileService::CreateProfile(nsIFile* aRootDir,
  * get essentially the same benefits as dedicated profiles provides.
  */
 bool nsToolkitProfileService::IsSnapEnvironment() {
-  const char* snapName = mozilla::widget::WidgetUtils::GetSnapInstanceName();
-
-  // return early if not set.
-  if (snapName == nullptr) {
-    return false;
-  }
-
-  // snapName as defined on e.g.
-  // https://snapcraft.io/firefox or https://snapcraft.io/thunderbird
-  return (strcmp(snapName, MOZ_APP_NAME) == 0);
+#ifdef MOZ_WIDGET_GTK
+  return widget::IsRunningUnderSnap();
+#else
+  return false;
+#endif
 }
 
 /**

widget/WidgetUtils.cpp

@@ -130,14 +130,5 @@ void WidgetUtils::GetBrandShortName(nsAString& aBrandName) {
   }
 }
 
-const char* WidgetUtils::GetSnapInstanceName() {
-  char* instanceName = PR_GetEnv("SNAP_INSTANCE_NAME");
-  if (instanceName != nullptr) {
-    return instanceName;
-  }
-  // Compatibility for snapd <= 2.35:
-  return PR_GetEnv("SNAP_NAME");
-}
-
 }  // namespace widget
 }  // namespace mozilla

widget/WidgetUtils.h

@@ -88,11 +88,6 @@ class WidgetUtils {
    * Get branchShortName from string bundle
    */
   static void GetBrandShortName(nsAString& aBrandName);
-
-  /* When packaged as a snap, strict confinement needs to be accounted for.
-     See https://snapcraft.io/docs for details.
-     Return the snap's instance name, or null when not running as a snap. */
-  static const char* GetSnapInstanceName();
 };
 
 }  // namespace widget

widget/gtk/WaylandBuffer.cpp

@@ -12,7 +12,7 @@
 
 #include "gfx2DGlue.h"
 #include "gfxPlatform.h"
-#include "mozilla/WidgetUtils.h"  // For WidgetUtils
+#include "mozilla/WidgetUtilsGtk.h"
 #include "mozilla/gfx/Tools.h"
 #include "nsPrintfCString.h"
 #include "prenv.h"  // For PR_GetEnv
@@ -44,9 +44,8 @@ char* WaylandBufferSHM::mDumpDir = PR_GetEnv("MOZ_WAYLAND_DUMP_DIR");
 static int WaylandAllocateShmMemory(int aSize) {
   int fd = -1;
 
-  nsCString shmPrefix("/");
-  const char* snapName = mozilla::widget::WidgetUtils::GetSnapInstanceName();
-  if (snapName != nullptr) {
+  nsAutoCString shmPrefix("/");
+  if (const char* snapName = GetSnapInstanceName()) {
     shmPrefix.AppendPrintf("snap.%s.", snapName);
   }
   shmPrefix.Append("wayland.mozilla.ipc");

widget/gtk/WidgetUtilsGtk.cpp

@@ -98,23 +98,41 @@ bool IsRunningUnderFlatpak() {
   return sRunning;
 }
 
+bool IsRunningUnderSnap() {
+  static bool sRunning = [] {
+    const char* instanceName = [] {
+      if (const char* instanceName = g_getenv("SNAP_INSTANCE_NAME")) {
+        return instanceName;
+      }
+      // Compatibility for snapd <= 2.35:
+      return g_getenv("SNAP_NAME");
+    }();
+    return instanceName && !strcmp(instanceName, SNAP_INSTANCE_NAME);
+  };
+  return sRunning;
+}
+
+const char* GetSnapInstanceName() {
+  return IsRunningUnderSnap() ? SNAP_INSTANCE_NAME : nullptr;
+}
+
 bool ShouldUsePortal(PortalKind aPortalKind) {
-  static bool sFlatpakPortalEnv = [] {
-    if (IsRunningUnderFlatpak()) {
+  static bool sPortalEnv = [] {
+    if (IsRunningUnderFlatpakOrSnap()) {
       return true;
     }
     const char* portalEnvString = g_getenv("GTK_USE_PORTAL");
     return portalEnvString && atoi(portalEnvString) != 0;
   }();
 
-  bool autoBehavior = sFlatpakPortalEnv;
+  bool autoBehavior = sPortalEnv;
   const int32_t pref = [&] {
     switch (aPortalKind) {
       case PortalKind::FilePicker:
         return StaticPrefs::widget_use_xdg_desktop_portal_file_picker();
       case PortalKind::MimeHandler:
         // Mime portal breaks default browser handling, see bug 1516290.
-        autoBehavior = IsRunningUnderFlatpak();
+        autoBehavior = IsRunningUnderFlatpakOrSnap();
         return StaticPrefs::widget_use_xdg_desktop_portal_mime_handler();
       case PortalKind::Print:
         // Print portal still needs more work, so auto behavior is just when

widget/gtk/WidgetUtilsGtk.h

@@ -10,7 +10,9 @@
 #include "nsTArray.h"
 
 #include <stdint.h>
-#include <gdk/gdk.h>
+
+typedef struct _GdkDisplay GdkDisplay;
+typedef struct _GdkDevice GdkDevice;
 
 namespace mozilla::widget {
 
@@ -31,6 +33,23 @@ bool GdkIsX11Display();
 GdkDevice* GdkGetPointer();
 
 bool IsRunningUnderFlatpak();
+
+// When packaged as a snap, strict confinement needs to be accounted for.
+// See https://snapcraft.io/docs for details.
+// Name as defined on e.g.
+// https://snapcraft.io/firefox or https://snapcraft.io/thunderbird
+#ifdef MOZ_APP_NAME
+#  define SNAP_INSTANCE_NAME MOZ_APP_NAME
+#endif
+
+bool IsRunningUnderSnap();
+inline bool IsRunningUnderFlatpakOrSnap() {
+  return IsRunningUnderFlatpak() || IsRunningUnderSnap();
+}
+
+// Return the snap's instance name, or null when not running as a snap.
+const char* GetSnapInstanceName();
+
 enum class PortalKind {
   FilePicker,
   MimeHandler,