298 lines
8.2 KiB
C++
298 lines
8.2 KiB
C++
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "Utils.h"
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#include <android-base/file.h>
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#include <android-base/logging.h>
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#include <android-base/stringprintf.h>
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#include <fcntl.h>
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#include <linux/fs.h>
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#include <stdlib.h>
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#include <sys/mount.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <sys/statvfs.h>
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#include <selinux/android.h>
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using android::base::ReadFileToString;
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using android::base::StringPrintf;
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namespace android {
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namespace vold {
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static const char* kKeyPath = "/data/misc/vold";
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status_t ForkExecvp(const std::vector<std::string>& args) {
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return ForkExecvp(args, nullptr);
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}
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status_t ForkExecvp(const std::vector<std::string>& args, security_context_t context) {
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size_t argc = args.size();
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char** argv = (char**) calloc(argc, sizeof(char*));
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for (size_t i = 0; i < argc; i++) {
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argv[i] = (char*) args[i].c_str();
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if (i == 0) {
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LOG(VERBOSE) << args[i];
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} else {
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LOG(VERBOSE) << " " << args[i];
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}
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}
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if (setexeccon(context)) {
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LOG(ERROR) << "Failed to setexeccon";
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abort();
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}
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abort();
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status_t res = 1;//android_fork_execvp(argc, argv, NULL, false, true);
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if (setexeccon(nullptr)) {
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LOG(ERROR) << "Failed to setexeccon";
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abort();
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}
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free(argv);
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return res;
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}
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status_t ForkExecvp(const std::vector<std::string>& args,
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std::vector<std::string>& output) {
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return ForkExecvp(args, output, nullptr);
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}
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status_t ForkExecvp(const std::vector<std::string>& args,
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std::vector<std::string>& output, security_context_t context) {
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std::string cmd;
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for (size_t i = 0; i < args.size(); i++) {
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cmd += args[i] + " ";
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if (i == 0) {
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LOG(VERBOSE) << args[i];
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} else {
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LOG(VERBOSE) << " " << args[i];
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}
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}
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output.clear();
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if (setexeccon(context)) {
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LOG(ERROR) << "Failed to setexeccon";
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abort();
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}
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FILE* fp = popen(cmd.c_str(), "r");
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if (setexeccon(nullptr)) {
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LOG(ERROR) << "Failed to setexeccon";
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abort();
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}
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if (!fp) {
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PLOG(ERROR) << "Failed to popen " << cmd;
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return -errno;
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}
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char line[1024];
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while (fgets(line, sizeof(line), fp) != nullptr) {
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LOG(VERBOSE) << line;
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output.push_back(std::string(line));
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}
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if (pclose(fp) != 0) {
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PLOG(ERROR) << "Failed to pclose " << cmd;
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return -errno;
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}
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return OK;
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}
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pid_t ForkExecvpAsync(const std::vector<std::string>& args) {
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size_t argc = args.size();
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char** argv = (char**) calloc(argc + 1, sizeof(char*));
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for (size_t i = 0; i < argc; i++) {
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argv[i] = (char*) args[i].c_str();
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if (i == 0) {
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LOG(VERBOSE) << args[i];
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} else {
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LOG(VERBOSE) << " " << args[i];
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}
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}
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pid_t pid = fork();
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if (pid == 0) {
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close(STDIN_FILENO);
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close(STDOUT_FILENO);
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close(STDERR_FILENO);
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if (execvp(argv[0], argv)) {
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PLOG(ERROR) << "Failed to exec";
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}
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_exit(1);
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}
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if (pid == -1) {
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PLOG(ERROR) << "Failed to exec";
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}
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free(argv);
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return pid;
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}
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status_t ReadRandomBytes(size_t bytes, std::string& out) {
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out.clear();
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int fd = TEMP_FAILURE_RETRY(open("/dev/urandom", O_RDONLY | O_CLOEXEC | O_NOFOLLOW));
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if (fd == -1) {
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return -errno;
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}
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char buf[BUFSIZ];
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size_t n;
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while ((n = TEMP_FAILURE_RETRY(read(fd, &buf[0], std::min(sizeof(buf), bytes)))) > 0) {
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out.append(buf, n);
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bytes -= n;
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}
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close(fd);
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if (bytes == 0) {
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return OK;
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} else {
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return -EIO;
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}
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}
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status_t HexToStr(const std::string& hex, std::string& str) {
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str.clear();
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bool even = true;
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char cur = 0;
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for (size_t i = 0; i < hex.size(); i++) {
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int val = 0;
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switch (hex[i]) {
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case ' ': case '-': case ':': continue;
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case 'f': case 'F': val = 15; break;
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case 'e': case 'E': val = 14; break;
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case 'd': case 'D': val = 13; break;
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case 'c': case 'C': val = 12; break;
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case 'b': case 'B': val = 11; break;
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case 'a': case 'A': val = 10; break;
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case '9': val = 9; break;
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case '8': val = 8; break;
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case '7': val = 7; break;
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case '6': val = 6; break;
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case '5': val = 5; break;
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case '4': val = 4; break;
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case '3': val = 3; break;
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case '2': val = 2; break;
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case '1': val = 1; break;
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case '0': val = 0; break;
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default: return -EINVAL;
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}
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if (even) {
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cur = val << 4;
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} else {
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cur += val;
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str.push_back(cur);
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cur = 0;
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}
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even = !even;
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}
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return even ? OK : -EINVAL;
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}
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static bool isValidFilename(const std::string& name) {
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if (name.empty() || (name == ".") || (name == "..")
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|| (name.find('/') != std::string::npos)) {
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return false;
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} else {
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return true;
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}
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}
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std::string BuildKeyPath(const std::string& partGuid) {
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return StringPrintf("%s/expand_%s.key", kKeyPath, partGuid.c_str());
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}
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std::string BuildDataSystemLegacyPath(userid_t userId) {
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return StringPrintf("%s/system/users/%u", BuildDataPath(nullptr).c_str(), userId);
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}
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std::string BuildDataSystemCePath(userid_t userId) {
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return StringPrintf("%s/system_ce/%u", BuildDataPath(nullptr).c_str(), userId);
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}
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std::string BuildDataSystemDePath(userid_t userId) {
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return StringPrintf("%s/system_de/%u", BuildDataPath(nullptr).c_str(), userId);
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}
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std::string BuildDataMiscLegacyPath(userid_t userId) {
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return StringPrintf("%s/misc/user/%u", BuildDataPath(nullptr).c_str(), userId);
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}
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std::string BuildDataMiscCePath(userid_t userId) {
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return StringPrintf("%s/misc_ce/%u", BuildDataPath(nullptr).c_str(), userId);
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}
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std::string BuildDataMiscDePath(userid_t userId) {
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return StringPrintf("%s/misc_de/%u", BuildDataPath(nullptr).c_str(), userId);
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}
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// Keep in sync with installd (frameworks/native/cmds/installd/utils.h)
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std::string BuildDataProfilesDePath(userid_t userId) {
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return StringPrintf("%s/misc/profiles/cur/%u", BuildDataPath(nullptr).c_str(), userId);
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}
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std::string BuildDataProfilesForeignDexDePath(userid_t userId) {
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std::string profiles_path = BuildDataProfilesDePath(userId);
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return StringPrintf("%s/foreign-dex", profiles_path.c_str());
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}
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std::string BuildDataPath(const char* volumeUuid) {
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// TODO: unify with installd path generation logic
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if (volumeUuid == nullptr) {
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return "/data";
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} else {
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CHECK(isValidFilename(volumeUuid));
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return StringPrintf("/mnt/expand/%s", volumeUuid);
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}
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}
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std::string BuildDataMediaCePath(const char* volumeUuid, userid_t userId) {
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// TODO: unify with installd path generation logic
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std::string data(BuildDataPath(volumeUuid));
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return StringPrintf("%s/media/%u", data.c_str(), userId);
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}
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std::string BuildDataUserCePath(const char* volumeUuid, userid_t userId) {
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// TODO: unify with installd path generation logic
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std::string data(BuildDataPath(volumeUuid));
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if (volumeUuid == nullptr) {
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if (userId == 0) {
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return StringPrintf("%s/data", data.c_str());
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} else {
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return StringPrintf("%s/user/%u", data.c_str(), userId);
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}
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} else {
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return StringPrintf("%s/user/%u", data.c_str(), userId);
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}
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}
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std::string BuildDataUserDePath(const char* volumeUuid, userid_t userId) {
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// TODO: unify with installd path generation logic
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std::string data(BuildDataPath(volumeUuid));
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return StringPrintf("%s/user_de/%u", data.c_str(), userId);
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}
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} // namespace vold
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} // namespace android
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