(re-commit) Implement installation of the Chrome App Host.

chrome/installer/setup/setup_main.cc

Index: chrome/installer/setup/setup_main.cc
diff --git a/chrome/installer/setup/setup_main.cc b/chrome/installer/setup/setup_main.cc
index 9d9ff5a5ec26f08bc53748e4c5c1a19e5ee2d6f1..eb59d175a630b57a8153b5bbdcb399353f9375f4 100644
--- a/chrome/installer/setup/setup_main.cc
+++ b/chrome/installer/setup/setup_main.cc
@@ -148,8 +148,10 @@ DWORD UnPackArchive(const FilePath& archive,
 void AddExistingMultiInstalls(const InstallationState& original_state,
                               InstallerState* installer_state) {
   if (installer_state->is_multi_install()) {
-    for (size_t i = 0; i < BrowserDistribution::kNumProductTypes; ++i) {
-      BrowserDistribution::Type type = BrowserDistribution::kProductTypes[i];
+    for (size_t i = 0; i < BrowserDistribution::NUM_TYPES; ++i) {
+      BrowserDistribution::Type type =
+          static_cast<BrowserDistribution::Type>(i);
+
       if (!installer_state->FindProduct(type)) {
         const ProductState* state =
             original_state.GetProductState(installer_state->system_install(),
@@ -333,18 +335,20 @@ bool CheckGroupPolicySettings(const InstallationState& original_state,
 #endif  // defined(GOOGLE_CHROME_BUILD)
 }
 
-// The supported multi-install modes are:
-// --multi-install --chrome --chrome-frame --ready-mode
+// If Chrome Frame is being installed by itself in multi-mode, non-ready-mode:
+//   - If a non-multi Chrome Frame installation is present, fail.
+// If Chrome Frame is being installed by itself in multi-mode, ready-mode:
+//   - If no Chrome installation is present, fail.
+//   - If a Chrome installation is present, add it to the set of products to
+//     install.
+// If Chrome Frame is being installed with Chrome in multi-mode, ready-mode:
 //   - If a non-multi Chrome Frame installation is present, Chrome Frame is
 //     removed from |installer_state|'s list of products (thereby preserving
 //     the existing SxS install).
 //   - If a multi Chrome Frame installation is present, its options are
 //     preserved (i.e., the --ready-mode command-line option is ignored).
-// --multi-install --chrome-frame
-//   - If a non-multi Chrome Frame installation is present, fail.
-//   - If --ready-mode and no Chrome installation is present, fail.
-//   - If a Chrome installation is present, add it to the set of products to
-//     install.
+// If any product is being installed in single-mode that already exists in
+// multi-mode, fail.
 bool CheckMultiInstallConditions(const InstallationState& original_state,
                                  InstallerState* installer_state,
                                  installer::InstallStatus* status) {
@@ -356,13 +360,42 @@ bool CheckMultiInstallConditions(const InstallationState& original_state,
   if (installer_state->is_multi_install()) {
     const Product* chrome =
         installer_state->FindProduct(BrowserDistribution::CHROME_BROWSER);
+    const Product* app_host =
+        installer_state->FindProduct(BrowserDistribution::CHROME_APP_HOST);
+    const Product* binaries =
+        installer_state->FindProduct(BrowserDistribution::CHROME_BINARIES);
     const Product* chrome_frame =
         installer_state->FindProduct(BrowserDistribution::CHROME_FRAME);
     const ProductState* cf_state =
         original_state.GetProductState(system_level,
                                        BrowserDistribution::CHROME_FRAME);
-    if (chrome != NULL) {
-      if (chrome_frame != NULL &&
+    const ProductState* chrome_state =
+        original_state.GetProductState(system_level,
+                                       BrowserDistribution::CHROME_BROWSER);
+
+    if (!binaries) {
+      if (app_host && !chrome && !chrome_frame && !cf_state && !chrome_state) {
+        DCHECK(!system_level);
+        // App Host may use Chrome/Chrome binaries at system-level.
+        if (original_state.GetProductState(
+                true,  // system
+                BrowserDistribution::CHROME_BROWSER) ||
+            original_state.GetProductState(
+                true,  // system
+                BrowserDistribution::CHROME_BINARIES)) {
+          return true;
+        } else {
+          return false;
+        }
+      } else {
+        // Every other scenario requires the binaries to be installed/updated
+        // simultaneous to the main product.
+        return false;
+      }
+    }
+
+    if (chrome) {
+      if (chrome_frame &&
           chrome_frame->HasOption(installer::kOptionReadyMode)) {
         // We're being asked to install Chrome with Chrome Frame in ready-mode.
         // This is an optimistic operation: if a SxS install of Chrome Frame
@@ -384,51 +417,83 @@ bool CheckMultiInstallConditions(const InstallationState& original_state,
           VLOG(1) << "Performing initial install of Chrome Frame ready-mode.";
         }
       }
-    } else if (chrome_frame != NULL) {
-      // We're being asked to install or update Chrome Frame alone.
-      const ProductState* chrome_state =
-          original_state.GetProductState(system_level,
-                                         BrowserDistribution::CHROME_BROWSER);
-      if (chrome_state != NULL) {
-        // Add Chrome to the set of products (making it multi-install in the
-        // process) so that it is updated, too.
-        scoped_ptr<Product> multi_chrome(new Product(
-            BrowserDistribution::GetSpecificDistribution(
-                BrowserDistribution::CHROME_BROWSER)));
-        multi_chrome->SetOption(installer::kOptionMultiInstall, true);
-        chrome = installer_state->AddProduct(&multi_chrome);
-        VLOG(1) << "Upgrading existing multi-install Chrome browser along with "
-                << chrome_frame->distribution()->GetAppShortCutName();
-      } else if (chrome_frame->HasOption(installer::kOptionReadyMode)) {
-        // Chrome Frame with ready-mode is to be installed, yet Chrome is
-        // neither installed nor being installed.  Fail.
-        LOG(ERROR) << "Cannot install Chrome Frame in ready mode without "
-                      "Chrome.";
-        *status = installer::READY_MODE_REQUIRES_CHROME;
-        installer_state->WriteInstallerResult(*status,
-            IDS_INSTALL_READY_MODE_REQUIRES_CHROME_BASE, NULL);
-        return false;
-      }
+    } else if (chrome_state != NULL) {
+      // Chrome Frame is being installed in multi-install mode, and Chrome is
+      // already present. Add Chrome to the set of products (making it
+      // multi-install in the process) so that it is updated, too.
+      scoped_ptr<Product> multi_chrome(new Product(
+          BrowserDistribution::GetSpecificDistribution(
+              BrowserDistribution::CHROME_BROWSER)));
+      multi_chrome->SetOption(installer::kOptionMultiInstall, true);
+      chrome = installer_state->AddProduct(&multi_chrome);
+      VLOG(1) << "Upgrading existing Chrome browser in multi-install mode.";
+    } else if (chrome_frame &&
+               chrome_frame->HasOption(installer::kOptionReadyMode)) {
+      // Chrome Frame with ready-mode is to be installed, yet Chrome is
+      // neither installed nor being installed.  Fail.
+      LOG(ERROR) << "Cannot install Chrome Frame in ready mode without Chrome.";
+      *status = installer::READY_MODE_REQUIRES_CHROME;
+      installer_state->WriteInstallerResult(
+          *status, IDS_INSTALL_READY_MODE_REQUIRES_CHROME_BASE, NULL);
+      return false;
     }
 
     // Fail if we're installing Chrome Frame when a single-install of it is
     // already installed.
     // TODO(grt): Add support for migration of Chrome Frame from single- to
     // multi-install.
-    if (chrome_frame != NULL &&
-        cf_state != NULL && !cf_state->is_multi_install()) {
+    if (chrome_frame && cf_state && !cf_state->is_multi_install()) {
       LOG(ERROR) << "Cannot migrate existing Chrome Frame installation to "
-                    "multi-install.";
+                 << "multi-install.";
       *status = installer::NON_MULTI_INSTALLATION_EXISTS;
       installer_state->WriteInstallerResult(*status,
           IDS_INSTALL_NON_MULTI_INSTALLATION_EXISTS_BASE, NULL);
       return false;
     }
-  } else if (DCHECK_IS_ON()) {
+  } else {
+    // This is a non-multi installation.
+
     // It isn't possible to stuff two products into a single-install
     // InstallerState.  Abort the process here in debug builds just in case
     // someone finds a way.
     DCHECK_EQ(1U, products.size());
+    if (products.size() != 1)
+      return false;
+
+    // Check for an existing installation of the product.
+    const ProductState* product_state = original_state.GetProductState(
+        system_level, products[0]->distribution()->GetType());
+    if (product_state != NULL) {
+      // Block downgrades from multi-install to single-install.
+      if (product_state->is_multi_install()) {
+        LOG(ERROR) << "Multi-install "
+                   << products[0]->distribution()->GetAppShortCutName()
+                   << " exists; aborting single install.";
+        *status = installer::MULTI_INSTALLATION_EXISTS;
+        installer_state->WriteInstallerResult(*status,
+            IDS_INSTALL_MULTI_INSTALLATION_EXISTS_BASE, NULL);
+        return false;
+      }
+    }
+
+  }
+
+  return true;
+}
+
+bool CheckAppHostPreconditions(const InstallationState& original_state,
+                               InstallerState* installer_state) {
+  if (!installer_state->FindProduct(BrowserDistribution::CHROME_APP_HOST))
+    return true;
+
+  if (!installer_state->is_multi_install()) {
+    VLOG(1) << "Application Host may only be installed in multi-install mode.";
+    return false;
+  }
+
+  if (installer_state->system_install()) {
+    VLOG(1) << "Application Host may only be installed at user-level.";
+    return false;
   }
 
   return true;
@@ -446,9 +511,11 @@ bool CheckMultiInstallConditions(const InstallationState& original_state,
 bool CheckPreInstallConditions(const InstallationState& original_state,
                                InstallerState* installer_state,
                                installer::InstallStatus* status) {
-  // See what products are already installed in multi mode.  When we do multi
-  // installs, we must upgrade all installations since they share the binaries.
-  AddExistingMultiInstalls(original_state, installer_state);
+  if (!CheckAppHostPreconditions(original_state, installer_state))
+    return false;
+
+  if (!CheckMultiInstallConditions(original_state, installer_state, status))
+    return false;
 
   const Products& products = installer_state->products();
   if (products.empty()) {
@@ -461,57 +528,47 @@ bool CheckPreInstallConditions(const InstallationState& original_state,
     return false;
   }
 
-  if (!CheckMultiInstallConditions(original_state, installer_state, status))
-    return false;
+  // See what products are already installed in multi mode.  When we do multi
+  // installs, we must upgrade all installations since they share the binaries.
+  AddExistingMultiInstalls(original_state, installer_state);
 
-  bool is_first_install = true;
-  const bool system_level = installer_state->system_install();
+  if (!installer_state->system_install()) {
+    // This is a user-level installation. Make sure that we are not installing
+    // on top of an existing system-level installation.
+    for (size_t i = 0; i < products.size(); ++i) {
+      const Product* product = products[i];
+      BrowserDistribution* browser_dist = product->distribution();
+      const ProductState* user_level_product_state =
+          original_state.GetProductState(false, browser_dist->GetType());
+      const ProductState* system_level_product_state =
+          original_state.GetProductState(true, browser_dist->GetType());
 
-  for (size_t i = 0; i < products.size(); ++i) {
-    const Product* product = products[i];
-    BrowserDistribution* browser_dist = product->distribution();
+      // Allow upgrades to proceed so that out-of-date versions are not left
+      // around.
+      if (user_level_product_state)
+        continue;
 
-    // Check for an existing installation of the product.
-    const ProductState* product_state =
-        original_state.GetProductState(system_level, browser_dist->GetType());
-    if (product_state != NULL) {
-      is_first_install = false;
-      // Block downgrades from multi-install to single-install.
-      if (!installer_state->is_multi_install() &&
-          product_state->is_multi_install()) {
-        LOG(ERROR) << "Multi-install " << browser_dist->GetAppShortCutName()
-                   << " exists; aborting single install.";
-        *status = installer::MULTI_INSTALLATION_EXISTS;
-        installer_state->WriteInstallerResult(*status,
-            IDS_INSTALL_MULTI_INSTALLATION_EXISTS_BASE, NULL);
-        return false;
-      }
-    }
+      // This is a new user-level install...
 
-    // Check to avoid attempting to lay down a user-level installation on top
-    // of a system-level one.
-    const ProductState* other_state =
-        original_state.GetProductState(!system_level, browser_dist->GetType());
-    if (other_state != NULL && !system_level) {
-      if (is_first_install) {
-        // This is a user-level install and there is a system-level install of
-        // the product.
+      if (system_level_product_state) {
+        // ... and the product already exists at system-level.
         LOG(ERROR) << "Already installed version "
-                   << other_state->version().GetString()
+                   << system_level_product_state->version().GetString()
                    << " at system-level conflicts with this one at user-level.";
         if (product->is_chrome()) {
           // Instruct Google Update to launch the existing system-level Chrome.
           // There should be no error dialog.
-          FilePath chrome_exe(installer::GetChromeInstallPath(!system_level,
-                                                              browser_dist));
-          if (chrome_exe.empty()) {
-            // If we failed to construct install path. Give up.
+          FilePath install_path(installer::GetChromeInstallPath(true,  // system
+                                                                browser_dist));
+          if (install_path.empty()) {
+            // Give up if we failed to construct the install path.
             *status = installer::OS_ERROR;
             installer_state->WriteInstallerResult(*status,
-                IDS_INSTALL_OS_ERROR_BASE, NULL);
+                                                  IDS_INSTALL_OS_ERROR_BASE,
+                                                  NULL);
           } else {
             *status = installer::EXISTING_VERSION_LAUNCHED;
-            chrome_exe = chrome_exe.Append(installer::kChromeExe);
+            FilePath chrome_exe = install_path.Append(installer::kChromeExe);
             CommandLine cmd(chrome_exe);
             cmd.AppendSwitch(switches::kFirstRun);
             installer_state->WriteInstallerResult(*status, 0, NULL);
@@ -519,31 +576,13 @@ bool CheckPreInstallConditions(const InstallationState& original_state,
             base::LaunchProcess(cmd, base::LaunchOptions(), NULL);
           }
         } else {
-          // Display an error message for Chrome Frame.
+          // Display an error message for other products.
           *status = installer::SYSTEM_LEVEL_INSTALL_EXISTS;
-          installer_state->WriteInstallerResult(*status,
-              IDS_INSTALL_SYSTEM_LEVEL_EXISTS_BASE, NULL);
+          installer_state->WriteInstallerResult(
+              *status, IDS_INSTALL_SYSTEM_LEVEL_EXISTS_BASE, NULL);
         }
         return false;
       }
-      // This is an update, not a new install. Allow it to take place so that
-      // out-of-date versions are not left around.
-    }
-  }
-
-  // If no previous installation of Chrome, make sure installation directory
-  // either does not exist or can be deleted (i.e. is not locked by some other
-  // process).
-  if (is_first_install) {
-    if (file_util::PathExists(installer_state->target_path()) &&
-        !file_util::Delete(installer_state->target_path(), true)) {
-      LOG(ERROR) << "Installation directory "
-                 << installer_state->target_path().value()
-                 << " exists and can not be deleted.";
-      *status = installer::INSTALL_DIR_IN_USE;
-      int str_id = IDS_INSTALL_DIR_IN_USE_BASE;
-      installer_state->WriteInstallerResult(*status, str_id, NULL);
-      return false;
     }
   }
 
@@ -570,7 +609,7 @@ installer::InstallStatus InstallProductsHelper(
     archive = cmd_line.GetSwitchValuePath(
         installer::switches::kInstallArchive);
   }
-  VLOG(1) << "Archive found to install Chrome " << archive.value();
+
   const Products& products = installer_state.products();
 
   // Create a temp folder where we will unpack Chrome archive. If it fails,
@@ -586,13 +625,48 @@ installer::InstallStatus InstallProductsHelper(
   VLOG(1) << "created path " << temp_path.path().value();
 
   FilePath unpack_path(temp_path.path().Append(installer::kInstallSourceDir));
-  if (UnPackArchive(archive, installer_state, temp_path.path(), unpack_path,
-                    archive_type)) {
-    install_status = (*archive_type) == installer::INCREMENTAL_ARCHIVE_TYPE ?
-        installer::APPLY_DIFF_PATCH_FAILED : installer::UNCOMPRESSION_FAILED;
-    installer_state.WriteInstallerResult(install_status,
-        IDS_INSTALL_UNCOMPRESSION_FAILED_BASE, NULL);
+
+  bool unpacked = false;
+
+  // We want to keep uncompressed archive (chrome.7z) that we get after
+  // uncompressing and binary patching. Get the location for this file.
+  FilePath archive_to_copy;
+  if (file_util::PathExists(archive)) {
+    VLOG(1) << "Archive found to install Chrome " << archive.value();
+    if (UnPackArchive(archive, installer_state, temp_path.path(), unpack_path,
+                      archive_type)) {
+      install_status = (*archive_type) == installer::INCREMENTAL_ARCHIVE_TYPE ?
+          installer::APPLY_DIFF_PATCH_FAILED : installer::UNCOMPRESSION_FAILED;
+      installer_state.WriteInstallerResult(
+          install_status,
+          IDS_INSTALL_UNCOMPRESSION_FAILED_BASE,
+          NULL);
+    } else {
+      unpacked = true;
+      archive_to_copy = temp_path.path().Append(installer::kChromeArchive);
+    }
   } else {
+    FilePath uncompressed_archive(cmd_line.GetProgram().DirName().Append(
+        installer::kChromeArchive));
+
+    if (file_util::PathExists(uncompressed_archive)) {
+      VLOG(1) << "Uncompressed archive found to install Chrome "
+              << uncompressed_archive.value();
+      *archive_type = installer::FULL_ARCHIVE_TYPE;
+      string16 unpacked_file;
+      if (LzmaUtil::UnPackArchive(uncompressed_archive.value(),
+                                  unpack_path.value(), &unpacked_file)) {
+        installer_state.WriteInstallerResult(
+            installer::UNCOMPRESSION_FAILED,
+            IDS_INSTALL_UNCOMPRESSION_FAILED_BASE,
+            NULL);
+      } else {
+        unpacked = true;
+        archive_to_copy = uncompressed_archive;
+      }
+    }
+  }
+  if (unpacked) {
     VLOG(1) << "unpacked to " << unpack_path.value();
     FilePath src_path(unpack_path.Append(installer::kInstallSourceChromeDir));
     scoped_ptr<Version>
@@ -624,22 +698,28 @@ installer::InstallStatus InstallProductsHelper(
       }
 
       if (higher_products != 0) {
-        COMPILE_ASSERT(BrowserDistribution::NUM_TYPES == 3,
+        COMPILE_ASSERT(BrowserDistribution::NUM_TYPES == 4,
                        add_support_for_new_products_here_);
         const uint32 kBrowserBit = 1 << BrowserDistribution::CHROME_BROWSER;
         const uint32 kGCFBit = 1 << BrowserDistribution::CHROME_FRAME;
+        const uint32 kAppHostBit = 1 << BrowserDistribution::CHROME_APP_HOST;
         int message_id = 0;
 
         proceed_with_installation = false;
         install_status = installer::HIGHER_VERSION_EXISTS;
-        if ((higher_products & kBrowserBit) != 0) {
-          if ((higher_products & kGCFBit) != 0)
-            message_id = IDS_INSTALL_HIGHER_VERSION_CB_CF_BASE;
-          else
+        switch (higher_products) {
+          case kBrowserBit:
             message_id = IDS_INSTALL_HIGHER_VERSION_BASE;
-        } else {
-          DCHECK(higher_products == kGCFBit);
-          message_id = IDS_INSTALL_HIGHER_VERSION_CF_BASE;
+            break;
+          case kGCFBit:
+            message_id = IDS_INSTALL_HIGHER_VERSION_CF_BASE;
+            break;
+          case kGCFBit | kBrowserBit:
+            message_id = IDS_INSTALL_HIGHER_VERSION_CB_CF_BASE;
+            break;
+          default:
+            message_id = IDS_INSTALL_HIGHER_VERSION_APP_HOST_BASE;
+            break;
         }
 
         installer_state.WriteInstallerResult(install_status, message_id, NULL);
@@ -651,10 +731,6 @@ installer::InstallStatus InstallProductsHelper(
                                    *installer_version, &install_status);
 
       if (proceed_with_installation) {
-        // We want to keep uncompressed archive (chrome.7z) that we get after
-        // uncompressing and binary patching. Get the location for this file.
-        FilePath archive_to_copy(
-            temp_path.path().Append(installer::kChromeArchive));
         FilePath prefs_source_path(cmd_line.GetSwitchValueNative(
             installer::switches::kInstallerData));
         install_status = installer::InstallOrUpdateProduct(original_state,
@@ -879,11 +955,20 @@ installer::InstallStatus UninstallProducts(
     const InstallerState& installer_state,
     const CommandLine& cmd_line) {
   const Products& products = installer_state.products();
-  // InstallerState::Initialize always puts Chrome first, and we rely on that
-  // here for this reason: if Chrome is in-use, the user will be prompted to
-  // confirm uninstallation.  Upon cancel, we should not continue with the
-  // other products.
-  DCHECK(products.size() < 2 || products[0]->is_chrome());
+
+  if (installer_state.FindProduct(BrowserDistribution::CHROME_BROWSER)) {
+    // InstallerState::Initialize always puts Chrome first, and we rely on that
+    // here for this reason: if Chrome is in-use, the user will be prompted to
+    // confirm uninstallation.  Upon cancel, we should not continue with the
+    // other products.
+    DCHECK(products[0]->is_chrome());
+  }
+  if (installer_state.FindProduct(BrowserDistribution::CHROME_BINARIES)) {
+    // Chrome Binaries should be last; if something else is cancelled, they
+    // should stay.
+    DCHECK(products[products.size() - 1]->is_chrome_binaries());
+  }
+
   installer::InstallStatus install_status = installer::UNINSTALL_SUCCESSFUL;
   installer::InstallStatus prod_status = installer::UNKNOWN_STATUS;
   const bool force = cmd_line.HasSwitch(installer::switches::kForceUninstall);