1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
|
/******************************************************************************
*
* Copyright 2022 Google LLC
*
* 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 <base/logging.h>
#include <filesystem>
#include <string>
#include <vector>
namespace fs = std::filesystem;
// The user data should be stored in the subdirectory of |USER_DE_PATH|
static const std::string USER_DE_PATH = "/data/user_de/0";
// The migration process start only if |MIGRATION_FILE_CHECKER| is found in a
// previous location
static const std::string MIGRATION_FILE_CHECKER = "databases/bluetooth_db";
// List of possible package_name for bluetooth to get the data from / to
static const std::vector<std::string> ALLOWED_BT_PACKAGE_NAME = {
"com.android.bluetooth", // legacy name
"com.android.bluetooth.services", // Beta users
"com.google.android.bluetooth.services", // Droid fooder users
};
// Accessor to get the default allowed package list to be used in migration
// OEM can call their own method with their own allowed list
const std::vector<std::string> get_allowed_bt_package_name(void) {
return ALLOWED_BT_PACKAGE_NAME;
}
// Check if |dst| is in |base_dir| subdirectory and check the package name in
// |dst| is a allowed package name in the |pkg_list|
//
// Return an empty string if an issue occurred
// or the package name contained in |dst| on success
static std::string parse_destination_package_name(
const std::string& dst, const std::string& base_dir,
const std::vector<std::string>& pkg_list) {
const std::size_t found = dst.rfind("/");
// |dst| must contain a '/'
if (found == std::string::npos) {
LOG(ERROR) << "Destination format not valid " << dst;
return "";
}
// |dst| directory is supposed to be in |base_dir|
if (found != base_dir.length()) {
LOG(ERROR) << "Destination location not allowed: " << dst;
return "";
}
// This check prevent a '/' to be at the end of |dst|
if (found >= dst.length() - 1) {
LOG(ERROR) << "Destination format not valid " << dst;
return "";
}
const std::string dst_package_name = dst.substr(found + 1); // +1 for '/'
if (std::find(pkg_list.begin(), pkg_list.end(), dst_package_name) ==
pkg_list.end()) {
LOG(ERROR) << "Destination package_name not valid: " << dst_package_name
<< " Created from " << dst;
return "";
}
LOG(INFO) << "Current Bluetooth package name is: " << dst_package_name;
return dst_package_name;
}
// Check for data to migrate from the |allowed_bt_package_name|
// A migration will be performed if:
// * |dst| is different than |allowed_bt_package_name|
// * the following file is found:
// |USER_DE_PATH|/|allowed_bt_package_name|/|MIGRATION_FILE_CHECKER|
//
// After migration occurred, the |MIGRATION_FILE_CHECKER| is deleted to ensure
// the migration is only performed once
void handle_migration(const std::string& dst,
const std::vector<std::string>& allowed_bt_package_name) {
const std::string dst_package_name = parse_destination_package_name(
dst, USER_DE_PATH, allowed_bt_package_name);
if (dst_package_name.empty()) return;
for (const auto& pkg_name : allowed_bt_package_name) {
std::error_code error;
if (dst_package_name == pkg_name) {
LOG(INFO) << "Same location skipped: " << dst_package_name;
continue;
}
const fs::path dst_path = dst;
const fs::path pkg_path = USER_DE_PATH + "/" + pkg_name;
const fs::path local_migration_file_checker =
pkg_path.string() + "/" + MIGRATION_FILE_CHECKER;
if (!fs::exists(local_migration_file_checker, error)) {
LOG(INFO) << "Not a valid candidate for migration: " << pkg_path;
continue;
}
const fs::copy_options copy_flag =
fs::copy_options::overwrite_existing | fs::copy_options::recursive;
fs::copy(pkg_path, dst_path, copy_flag, error);
if (error) {
LOG(ERROR) << "Migration failed: " << error.message();
} else {
fs::remove(local_migration_file_checker);
LOG(INFO) << "Migration completed from " << pkg_path << " to " << dst;
}
break; // Copy from one and only one directory
}
}
|
