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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <algorithm>
#include <string>
#include <vector>
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/strings/string_split.h"
#include "chrome/updater/activity_impl_util_posix.h"
#include "chrome/updater/updater_branding.h"
#include "chrome/updater/updater_scope.h"
namespace updater {
namespace {
// Attempts to discover all of the home directories on the system by parsing
// /etc/passwd.
std::vector<base::FilePath> ReadHomeDirsFromPasswd() {
std::string passwd_contents;
if (!base::ReadFileToString(base::FilePath("/etc/passwd"),
&passwd_contents)) {
return {};
}
// /etc/passwd contains one line for each user account, with seven
// fields delimited by colons.
std::vector<base::FilePath> home_dirs;
std::ranges::transform(
base::SplitString(passwd_contents, "\n",
base::WhitespaceHandling::TRIM_WHITESPACE,
base::SplitResult::SPLIT_WANT_NONEMPTY),
std::back_inserter(home_dirs), [](const std::string& line) {
std::vector<std::string> entries = base::SplitString(
line, ":", base::WhitespaceHandling::KEEP_WHITESPACE,
base::SplitResult::SPLIT_WANT_ALL);
// The sixth entry (index 5) of the line will be the user's home
// directory.
return entries.size() == 7 ? base::FilePath(entries[5])
: base::FilePath();
});
// Remove invalid paths
std::erase(home_dirs, base::FilePath());
return home_dirs;
}
} // namespace
std::vector<base::FilePath> GetHomeDirPaths(UpdaterScope scope) {
switch (scope) {
case UpdaterScope::kUser: {
const base::FilePath path = base::GetHomeDir();
if (path.empty()) {
return {};
}
return {path};
}
case UpdaterScope::kSystem: {
return ReadHomeDirsFromPasswd();
}
}
return {};
}
base::FilePath GetActiveFile(const base::FilePath& home_dir,
const std::string& id) {
return home_dir.Append(".local")
.Append(COMPANY_SHORTNAME_STRING)
.Append(PRODUCT_FULLNAME_STRING)
.Append("Actives")
.Append(id);
}
} // namespace updater
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