Missed new files in last commit

src/platform/update_engine/install_action.cc

+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "update_engine/install_action.h"
+#include <errno.h>
+#include <vector>
+#include <gflags/gflags.h>
+#include "update_engine/filesystem_iterator.h"
+#include "update_engine/gzip.h"
+#include "update_engine/subprocess.h"
+#include "update_engine/utils.h"
+
+DEFINE_string(mount_install_path, "",
+              "If set, the path to use when mounting the "
+              "destination device during install");
+
+using std::vector;
+
+namespace chromeos_update_engine {
+
+namespace {
+const string kBspatchPath = "/usr/bin/bspatch";
+}
+
+void InstallAction::PerformAction() {
+  ScopedActionCompleter completer(processor_, this);
+  // For now, do nothing other than pass what we need to to the output pipe
+  CHECK(HasInputObject());
+  const InstallPlan install_plan = GetInputObject();
+  if (HasOutputPipe())
+    SetOutputObject(install_plan.install_path);
+  if (install_plan.is_full_update) {
+    // No need to perform an install
+    completer.set_success(true);
+    return;
+  }
+  // We have a delta update.
+
+  // Open delta file
+  DeltaDiffParser parser(install_plan.download_path);
+  if (!parser.valid()) {
+    LOG(ERROR) << "Unable to open delta file";
+    return;
+  }
+
+  // Mount install fs
+  string mountpoint = FLAGS_mount_install_path;
+  if (mountpoint.empty()) {
+    // Set up dest_path_
+    char *mountpoint_temp = strdup("/tmp/install_mnt.XXXXXX");
+    CHECK(mountpoint_temp);
+    CHECK_EQ(mountpoint_temp, mkdtemp(mountpoint_temp));
+    CHECK_NE('\0', mountpoint_temp[0]);
+    mountpoint = mountpoint_temp;
+    free(mountpoint_temp);
+  }
+
+  TEST_AND_RETURN(utils::MountFilesystem(install_plan.install_path,
+                                         mountpoint));
+
+  // Automatically unmount the fs when this goes out of scope:
+  ScopedFilesystemUnmounter filesystem_unmounter(mountpoint);
+
+  {
+    // iterate through existing fs, deleting unneeded files
+    FilesystemIterator iter(mountpoint,
+                            utils::SetWithValue<string>("/lost+found"));
+    for (; !iter.IsEnd(); iter.Increment()) {
+      if (!parser.ContainsPath(iter.GetPartialPath())) {
+        VLOG(1) << "install removing local path: " << iter.GetFullPath();
+        TEST_AND_RETURN(utils::RecursiveUnlinkDir(iter.GetFullPath()));
+      }
+    }
+    TEST_AND_RETURN(!iter.IsErr());
+  }
+
+  // iterate through delta metadata, writing files
+  DeltaDiffParserIterator iter = parser.Begin();
+  for (; iter != parser.End(); iter.Increment()) {
+    const DeltaArchiveManifest_File& file = iter.GetFile();
+    VLOG(1) << "Installing file: " << iter.path();
+    TEST_AND_RETURN(InstallFile(mountpoint, file, iter.path(), parser));
+  }
+
+  completer.set_success(true);
+}
+
+bool InstallAction::InstallFile(const std::string& mountpoint,
+                                const DeltaArchiveManifest_File& file,
+                                const std::string& path,
+                                const DeltaDiffParser& parser) const {
+  // See what's already there
+  struct stat existing_stbuf;
+  int result = lstat((mountpoint + path).c_str(), &existing_stbuf);
+  TEST_AND_RETURN_FALSE_ERRNO((result == 0) || (errno == ENOENT));
+  bool exists = (result == 0);
+  // Create the proper file
+  if (S_ISDIR(file.mode())) {
+    if (!exists) {
+      TEST_AND_RETURN_FALSE_ERRNO(
+          (mkdir((mountpoint + path).c_str(), file.mode())) == 0);
+    }
+  } else if (S_ISLNK(file.mode())) {
+    InstallFileSymlink(mountpoint, file, path, parser, exists);
+  } else if (S_ISCHR(file.mode()) ||
+             S_ISBLK(file.mode()) ||
+             S_ISFIFO(file.mode()) ||
+             S_ISSOCK(file.mode())) {
+    InstallFileSpecialFile(mountpoint, file, path, parser, exists);
+  } else if (S_ISREG(file.mode())) {
+    InstallFileRegularFile(mountpoint, file, path, parser, exists);
+  } else {
+    // unknown mode type
+    TEST_AND_RETURN_FALSE(false);
+  }
+
+  // chmod/chown new file
+  if (!S_ISLNK(file.mode()))
+    TEST_AND_RETURN_FALSE_ERRNO(chmod((mountpoint + path).c_str(), file.mode())
+                                == 0);
+  TEST_AND_RETURN_FALSE(file.has_uid() && file.has_gid());
+  TEST_AND_RETURN_FALSE_ERRNO(lchown((mountpoint + path).c_str(),
+                                     file.uid(), file.gid()) == 0);
+  return true;
+}
+
+bool InstallAction::InstallFileRegularFile(
+    const std::string& mountpoint,
+    const DeltaArchiveManifest_File& file,
+    const std::string& path,
+    const DeltaDiffParser& parser,
+    const bool exists) const {
+  if (!file.has_data_format())
+    return true;
+  TEST_AND_RETURN_FALSE(file.has_data_offset() && file.has_data_length());
+  if (file.data_format() == DeltaArchiveManifest_File_DataFormat_BSDIFF) {
+    // Expand with bspatch
+    string patch_path = utils::TempFilename(mountpoint + path + ".XXXXXX");
+    TEST_AND_RETURN_FALSE(file.has_data_length());
+    TEST_AND_RETURN_FALSE(parser.CopyDataToFile(
+        file.data_offset(),
+        static_cast<off_t>(file.data_length()), false,
+        patch_path));
+    string output_path = utils::TempFilename(mountpoint + path + ".XXXXXX");
+    int rc = 1;
+    vector<string> cmd;
+    cmd.push_back(kBspatchPath);
+    cmd.push_back(mountpoint + path);
+    cmd.push_back(output_path);
+    cmd.push_back(patch_path);
+    TEST_AND_RETURN_FALSE(Subprocess::SynchronousExec(cmd, &rc));
+    TEST_AND_RETURN_FALSE(rc == 0);
+    TEST_AND_RETURN_FALSE_ERRNO(rename(output_path.c_str(),
+                                       (mountpoint + path).c_str()) == 0);
+    TEST_AND_RETURN_FALSE_ERRNO(unlink(patch_path.c_str()) == 0);
+  } else {
+    // Expand full data, decompressing if necessary
+    TEST_AND_RETURN_FALSE((file.data_format() ==
+                           DeltaArchiveManifest_File_DataFormat_FULL) ||
+                          (file.data_format() ==
+                           DeltaArchiveManifest_File_DataFormat_FULL_GZ));
+    if (exists)
+      TEST_AND_RETURN_FALSE_ERRNO(unlink((mountpoint + path).c_str()) == 0);
+    TEST_AND_RETURN_FALSE(file.has_data_length());
+    const bool gzipped = file.data_format() ==
+        DeltaArchiveManifest_File_DataFormat_FULL_GZ;
+    bool success =
+        parser.CopyDataToFile(file.data_offset(), file.data_length(),
+                              gzipped,
+                              mountpoint + path);
+    TEST_AND_RETURN_FALSE(success);
+  }
+  return true;
+}
+
+// char/block devices, fifos, and sockets:
+bool InstallAction::InstallFileSpecialFile(
+    const std::string& mountpoint,
+    const DeltaArchiveManifest_File& file,
+    const std::string& path,
+    const DeltaDiffParser& parser,
+    const bool exists) const {
+  if (exists)
+    TEST_AND_RETURN_FALSE(unlink((mountpoint + path).c_str()) == 0);
+  dev_t dev = 0;
+  if (S_ISCHR(file.mode()) || S_ISBLK(file.mode())) {
+    vector<char> dev_proto;
+    TEST_AND_RETURN_FALSE(parser.ReadDataVector(file.data_offset(),
+                                                file.data_length(),
+                                                &dev_proto));
+    if (file.data_format() == DeltaArchiveManifest_File_DataFormat_FULL_GZ) {
+      TEST_AND_RETURN_FALSE(file.has_data_length());
+      {
+        vector<char> decompressed_dev_proto;
+        TEST_AND_RETURN_FALSE(GzipDecompress(dev_proto,
+                                             &decompressed_dev_proto));
+        dev_proto = decompressed_dev_proto;
+      }
+    } else {
+      TEST_AND_RETURN_FALSE(file.data_format() ==
+                            DeltaArchiveManifest_File_DataFormat_FULL);
+    }
+    LinuxDevice linux_device;
+    utils::HexDumpVector(dev_proto);
+    TEST_AND_RETURN_FALSE(linux_device.ParseFromArray(&dev_proto[0],
+                                                      dev_proto.size()));
+    dev = makedev(linux_device.major(), linux_device.minor());
+  }
+  TEST_AND_RETURN_FALSE_ERRNO(mknod((mountpoint + path).c_str(),
+                                    file.mode(), dev) == 0);
+  return true;
+}
+// symlinks:
+bool InstallAction::InstallFileSymlink(const std::string& mountpoint,
+                                       const DeltaArchiveManifest_File& file,
+                                       const std::string& path,
+                                       const DeltaDiffParser& parser,
+                                       const bool exists) const {
+  // If there's no data, we leave the symlink as is
+  if (!file.has_data_format())
+    return true;  // No changes needed
+  TEST_AND_RETURN_FALSE((file.data_format() ==
+                         DeltaArchiveManifest_File_DataFormat_FULL) ||
+                        (file.data_format() ==
+                         DeltaArchiveManifest_File_DataFormat_FULL_GZ));
+  TEST_AND_RETURN_FALSE(file.has_data_offset() && file.has_data_length());
+  // We have data, and thus use it to create a symlink.
+  // First delete any existing symlink:
+  if (exists)
+    TEST_AND_RETURN_FALSE_ERRNO(unlink((mountpoint + path).c_str()) == 0);
+  vector<char> symlink_data;
+  TEST_AND_RETURN_FALSE(parser.ReadDataVector(file.data_offset(),
+                                              file.data_length(),
+                                              &symlink_data));
+  if (file.data_format() == DeltaArchiveManifest_File_DataFormat_FULL_GZ) {
+    vector<char> decompressed_symlink_data;
+    TEST_AND_RETURN_FALSE(GzipDecompress(symlink_data,
+                                         &decompressed_symlink_data));
+    symlink_data = decompressed_symlink_data;
+  }
+  symlink_data.push_back('\0');
+  TEST_AND_RETURN_FALSE_ERRNO(symlink(&symlink_data[0],
+                                      (mountpoint + path).c_str()) == 0);
+  return true;
+}
+
+
+}  //   namespace chromeos_update_engine