Bug 1393805 - Part 1 - Add XRE_USER_SYS_EXTENSION_DEV_DIR XRESysExtDev Key. r=bobowen,gcp

Adds a new directory provider key "XRESysExtDev" to be used by system extension
developers needing to load system extensions from a directory readable by
sandboxed content processes.

MozReview-Commit-ID: 4BKOZoPzCC3

--HG--
extra : rebase_source : 8def79f66944f03943ea082dc3bbe746b7382010

toolkit/xre/nsXREDirProvider.cpp

@@ -478,6 +478,9 @@ nsXREDirProvider::GetFile(const char* aProperty, bool* aPersistent,
     return NS_ERROR_FAILURE;
 #endif
   }
+  else if (!strcmp(aProperty, XRE_USER_SYS_EXTENSION_DEV_DIR)) {
+    return GetSysUserExtensionsDevDirectory(aFile);
+  }
   else if (!strcmp(aProperty, XRE_APP_DISTRIBUTION_DIR)) {
     bool persistent = false;
     rv = GetFile(NS_GRE_DIR, &persistent, getter_AddRefs(file));
@@ -1522,6 +1525,23 @@ nsXREDirProvider::GetSysUserExtensionsDirectory(nsIFile** aFile)
   return NS_OK;
 }
 
+nsresult
+nsXREDirProvider::GetSysUserExtensionsDevDirectory(nsIFile** aFile)
+{
+  nsCOMPtr<nsIFile> localDir;
+  nsresult rv = GetUserDataDirectoryHome(getter_AddRefs(localDir), false);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = AppendSysUserExtensionsDevPath(localDir);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = EnsureDirectoryExists(localDir);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  localDir.forget(aFile);
+  return NS_OK;
+}
+
 #if defined(XP_UNIX) || defined(XP_MACOSX)
 nsresult
 nsXREDirProvider::GetSystemExtensionsDirectory(nsIFile** aFile)
@@ -1629,6 +1649,39 @@ nsXREDirProvider::AppendSysUserExtensionPath(nsIFile* aFile)
   return NS_OK;
 }
 
+nsresult
+nsXREDirProvider::AppendSysUserExtensionsDevPath(nsIFile* aFile)
+{
+  MOZ_ASSERT(aFile);
+
+  nsresult rv;
+
+#if defined (XP_MACOSX) || defined(XP_WIN)
+
+  static const char* const sXR = "Mozilla";
+  rv = aFile->AppendNative(nsDependentCString(sXR));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  static const char* const sExtensions = "SystemExtensionsDev";
+  rv = aFile->AppendNative(nsDependentCString(sExtensions));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+#elif defined(XP_UNIX)
+
+  static const char* const sXR = ".mozilla";
+  rv = aFile->AppendNative(nsDependentCString(sXR));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  static const char* const sExtensions = "systemextensionsdev";
+  rv = aFile->AppendNative(nsDependentCString(sExtensions));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+#else
+#error "Don't know how to get XRE system extension dev path on your platform"
+#endif
+  return NS_OK;
+}
+
 
 nsresult
 nsXREDirProvider::AppendProfilePath(nsIFile* aFile,

toolkit/xre/nsXREDirProvider.h

@@ -104,6 +104,7 @@ protected:
   nsresult GetFilesInternal(const char* aProperty, nsISimpleEnumerator** aResult);
   static nsresult GetUserDataDirectoryHome(nsIFile* *aFile, bool aLocal);
   static nsresult GetSysUserExtensionsDirectory(nsIFile* *aFile);
+  static nsresult GetSysUserExtensionsDevDirectory(nsIFile* *aFile);
 #if defined(XP_UNIX) || defined(XP_MACOSX)
   static nsresult GetSystemExtensionsDirectory(nsIFile** aFile);
 #endif
@@ -118,6 +119,7 @@ protected:
                                     bool aLocal);
 
   static nsresult AppendSysUserExtensionPath(nsIFile* aFile);
+  static nsresult AppendSysUserExtensionsDevPath(nsIFile* aFile);
 
   // Internal helper that splits a path into components using the '/' and '\\'
   // delimiters.

xpcom/build/nsXULAppAPI.h

@@ -128,6 +128,12 @@
  */
 #define XRE_USER_SYS_EXTENSION_DIR "XREUSysExt"
 
+/**
+ * A directory service key which specifies a directory where temporary
+ * system extensions can be loaded from during development.
+ */
+#define XRE_USER_SYS_EXTENSION_DEV_DIR "XRESysExtDev"
+
 /**
  * A directory service key which specifies the distribution specific files for
  * the application.