Install cros components to own path naming space

To avoid path conflicts, we install chrome os components (only) to
dedicated path naming space (cros_components/[component name]).

Since the components currently used are small (printer drivers), the
cost to migrate it small. It's a good idea to migrate now.

BUG=chromium:789726
TEST=update (ignore old locations)/install printer driver component on device.

Change-Id: I3276f73eaab50ec562d247d06eedb5c96ba183bf
Reviewed-on: https://chromium-review.googlesource.com/798225
Commit-Queue: Xiaochu Liu <xiaochu@chromium.org>
Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#522020}

chrome/browser/component_updater/cros_component_installer.cc

@@ -46,6 +46,8 @@
      {"sha2hashstr",                                                         \
       "5714811c04f0a63aac96b39096faa759ace4c04e9b68291e7c9716128f5a2722"}}}};
 
+#define COMPONENTS_ROOT_PATH "cros-components"
+
 using content::BrowserThread;
 
 namespace component_updater {
@@ -79,10 +81,23 @@ bool CrOSComponentInstallerPolicy::RequiresNetworkEncryption() const {
   return true;
 }
 
+void CleanupOldInstalls(const std::string& name) {
+  // Clean up components installed at old path.
+  base::FilePath path;
+  if (!PathService::Get(DIR_COMPONENT_USER, &path))
+    return;
+  path = path.Append(name);
+  if (base::PathExists(path))
+    base::DeleteFile(path, true);
+}
+
 update_client::CrxInstaller::Result
 CrOSComponentInstallerPolicy::OnCustomInstall(
     const base::DictionaryValue& manifest,
     const base::FilePath& install_dir) {
+  // TODO(xiaochu): remove this at M66 (crbug.com/792203).
+  CleanupOldInstalls(name);
+
   return update_client::CrxInstaller::Result(update_client::InstallError::NONE);
 }
 
@@ -109,7 +124,8 @@ bool CrOSComponentInstallerPolicy::VerifyInstallation(
 }
 
 base::FilePath CrOSComponentInstallerPolicy::GetRelativeInstallDir() const {
-  return base::FilePath(name);
+  base::FilePath path = base::FilePath(COMPONENTS_ROOT_PATH);
+  return path.Append(name);
 }
 
 void CrOSComponentInstallerPolicy::GetHash(std::vector<uint8_t>* hash) const {
@@ -242,6 +258,7 @@ std::vector<ComponentConfig> CrOSComponent::GetInstalledComponents() {
   if (!PathService::Get(DIR_COMPONENT_USER, &root))
     return configs;
 
+  root = root.Append(COMPONENTS_ROOT_PATH);
   const ConfigMap components = CONFIG_MAP_CONTENT;
   for (auto it : components) {
     const std::string& name = it.first;

components/component_updater/component_installer.cc

@@ -274,10 +274,11 @@ void ComponentInstaller::StartRegistration(
   // Then check for a higher-versioned user-wide installation.
   base::FilePath latest_path;
   std::unique_ptr<base::DictionaryValue> latest_manifest;
-  base::FilePath base_dir;
-  if (!PathService::Get(DIR_COMPONENT_USER, &base_dir))
+  base::FilePath base_component_dir;
+  if (!PathService::Get(DIR_COMPONENT_USER, &base_component_dir))
     return;
-  base_dir = base_dir.Append(installer_policy_->GetRelativeInstallDir());
+  base::FilePath base_dir =
+      base_component_dir.Append(installer_policy_->GetRelativeInstallDir());
   if (!base::PathExists(base_dir) && !base::CreateDirectory(base_dir)) {
     PLOG(ERROR) << "Could not create the base directory for "
                 << installer_policy_->GetName() << " ("
@@ -286,10 +287,16 @@ void ComponentInstaller::StartRegistration(
   }
 
 #if defined(OS_CHROMEOS)
-  if (!base::SetPosixFilePermissions(base_dir, 0755)) {
+  base::FilePath base_dir_ = base_component_dir;
+  std::vector<base::FilePath::StringType> components;
+  installer_policy_->GetRelativeInstallDir().GetComponents(&components);
+  for (const base::FilePath::StringType component : components) {
+    base_dir_ = base_dir_.Append(component);
+    if (!base::SetPosixFilePermissions(base_dir_, 0755)) {
       PLOG(ERROR) << "SetPosixFilePermissions failed: " << base_dir.value();
       return;
     }
+  }
 #endif  // defined(OS_CHROMEOS)
 
   std::vector<base::FilePath> older_paths;