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-rw-r--r--updater/updater_runtime.cpp132
1 files changed, 132 insertions, 0 deletions
diff --git a/updater/updater_runtime.cpp b/updater/updater_runtime.cpp
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+++ b/updater/updater_runtime.cpp
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+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "updater/updater_runtime.h"
+
+#include <string.h>
+#include <sys/mount.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#include <android-base/file.h>
+#include <android-base/logging.h>
+#include <android-base/properties.h>
+#include <android-base/strings.h>
+#include <android-base/unique_fd.h>
+#include <ext4_utils/wipe.h>
+#include <selinux/label.h>
+#include <tune2fs.h>
+
+#include "otautil/mounts.h"
+#include "otautil/sysutil.h"
+
+std::string UpdaterRuntime::GetProperty(const std::string_view key,
+ const std::string_view default_value) const {
+ return android::base::GetProperty(std::string(key), std::string(default_value));
+}
+
+std::string UpdaterRuntime::FindBlockDeviceName(const std::string_view name) const {
+ return std::string(name);
+}
+
+int UpdaterRuntime::Mount(const std::string_view location, const std::string_view mount_point,
+ const std::string_view fs_type, const std::string_view mount_options) {
+ std::string mount_point_string(mount_point);
+ char* secontext = nullptr;
+ if (sehandle_) {
+ selabel_lookup(sehandle_, &secontext, mount_point_string.c_str(), 0755);
+ setfscreatecon(secontext);
+ }
+
+ mkdir(mount_point_string.c_str(), 0755);
+
+ if (secontext) {
+ freecon(secontext);
+ setfscreatecon(nullptr);
+ }
+
+ return mount(std::string(location).c_str(), mount_point_string.c_str(),
+ std::string(fs_type).c_str(), MS_NOATIME | MS_NODEV | MS_NODIRATIME,
+ std::string(mount_options).c_str());
+}
+
+bool UpdaterRuntime::IsMounted(const std::string_view mount_point) const {
+ scan_mounted_volumes();
+ MountedVolume* vol = find_mounted_volume_by_mount_point(std::string(mount_point).c_str());
+ return vol != nullptr;
+}
+
+std::pair<bool, int> UpdaterRuntime::Unmount(const std::string_view mount_point) {
+ scan_mounted_volumes();
+ MountedVolume* vol = find_mounted_volume_by_mount_point(std::string(mount_point).c_str());
+ if (vol == nullptr) {
+ return { false, -1 };
+ }
+
+ int ret = unmount_mounted_volume(vol);
+ return { true, ret };
+}
+
+bool UpdaterRuntime::ReadFileToString(const std::string_view filename, std::string* content) const {
+ return android::base::ReadFileToString(std::string(filename), content);
+}
+
+bool UpdaterRuntime::WriteStringToFile(const std::string_view content,
+ const std::string_view filename) const {
+ return android::base::WriteStringToFile(std::string(content), std::string(filename));
+}
+
+int UpdaterRuntime::WipeBlockDevice(const std::string_view filename, size_t len) const {
+ android::base::unique_fd fd(open(std::string(filename).c_str(), O_WRONLY));
+ if (fd == -1) {
+ PLOG(ERROR) << "Failed to open " << filename;
+ return false;
+ }
+ // The wipe_block_device function in ext4_utils returns 0 on success and 1 for failure.
+ return wipe_block_device(fd, len);
+}
+
+int UpdaterRuntime::RunProgram(const std::vector<std::string>& args, bool is_vfork) const {
+ CHECK(!args.empty());
+ auto argv = StringVectorToNullTerminatedArray(args);
+ LOG(INFO) << "about to run program [" << args[0] << "] with " << argv.size() << " args";
+
+ pid_t child = is_vfork ? vfork() : fork();
+ if (child == 0) {
+ execv(argv[0], argv.data());
+ PLOG(ERROR) << "run_program: execv failed";
+ _exit(EXIT_FAILURE);
+ }
+
+ int status;
+ waitpid(child, &status, 0);
+ if (WIFEXITED(status)) {
+ if (WEXITSTATUS(status) != 0) {
+ LOG(ERROR) << "run_program: child exited with status " << WEXITSTATUS(status);
+ }
+ } else if (WIFSIGNALED(status)) {
+ LOG(ERROR) << "run_program: child terminated by signal " << WTERMSIG(status);
+ }
+
+ return status;
+}
+
+int UpdaterRuntime::Tune2Fs(const std::vector<std::string>& args) const {
+ auto tune2fs_args = StringVectorToNullTerminatedArray(args);
+ // tune2fs changes the filesystem parameters on an ext2 filesystem; it returns 0 on success.
+ return tune2fs_main(tune2fs_args.size() - 1, tune2fs_args.data());
+}