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
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
|
/*
* 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 "apexd_session.h"
#include "apexd_utils.h"
#include "status_or.h"
#include "string_log.h"
#include "session_state.pb.h"
#include <android-base/logging.h>
#include <dirent.h>
#include <sys/stat.h>
#include <filesystem>
#include <fstream>
#include <optional>
using apex::proto::SessionState;
namespace android {
namespace apex {
namespace {
static constexpr const char* kStateFileName = "state";
std::string getSessionDir(int session_id) {
return kApexSessionsDir + "/" + std::to_string(session_id);
}
std::string getSessionStateFilePath(int session_id) {
return getSessionDir(session_id) + "/" + kStateFileName;
}
StatusOr<std::string> createSessionDirIfNeeded(int session_id) {
// create /data/sessions
auto res = createDirIfNeeded(kApexSessionsDir, 0700);
if (!res.Ok()) {
return StatusOr<std::string>(res.ErrorMessage());
}
// create /data/sessions/session_id
std::string sessionDir = getSessionDir(session_id);
res = createDirIfNeeded(sessionDir, 0700);
if (!res.Ok()) {
return StatusOr<std::string>(res.ErrorMessage());
}
return StatusOr<std::string>(sessionDir);
}
Status deleteSessionDir(int session_id) {
std::string session_dir = getSessionDir(session_id);
LOG(DEBUG) << "Deleting " << session_dir;
auto path = std::filesystem::path(session_dir);
std::error_code error_code;
std::filesystem::remove_all(path, error_code);
if (error_code) {
return Status::Fail(StringLog() << "Failed to delete " << session_dir
<< " : " << error_code);
}
return Status::Success();
}
} // namespace
ApexSession::ApexSession(const SessionState& state) : state_(state) {}
StatusOr<ApexSession> ApexSession::CreateSession(int session_id) {
SessionState state;
// Create session directory
auto sessionPath = createSessionDirIfNeeded(session_id);
if (!sessionPath.Ok()) {
return StatusOr<ApexSession>::MakeError(sessionPath.ErrorMessage());
}
state.set_id(session_id);
ApexSession session(state);
return StatusOr<ApexSession>(std::move(session));
}
StatusOr<ApexSession> ApexSession::GetSessionFromFile(const std::string& path) {
SessionState state;
std::fstream stateFile(path, std::ios::in | std::ios::binary);
if (!stateFile) {
return StatusOr<ApexSession>::MakeError("Failed to open " + path);
}
if (!state.ParseFromIstream(&stateFile)) {
return StatusOr<ApexSession>::MakeError("Failed to parse " + path);
}
return StatusOr<ApexSession>(ApexSession(state));
}
StatusOr<ApexSession> ApexSession::GetSession(int session_id) {
auto path = getSessionStateFilePath(session_id);
return GetSessionFromFile(path);
}
std::vector<ApexSession> ApexSession::GetSessions() {
std::vector<ApexSession> sessions;
StatusOr<std::vector<std::string>> sessionPaths = ReadDir(
kApexSessionsDir, [](const std::filesystem::directory_entry& entry) {
std::error_code ec;
return entry.is_directory(ec);
});
if (!sessionPaths.Ok()) {
return sessions;
}
for (const std::string& sessionDirPath : *sessionPaths) {
// Try to read session state
auto session = GetSessionFromFile(sessionDirPath + "/" + kStateFileName);
if (!session.Ok()) {
LOG(WARNING) << session.ErrorMessage();
continue;
}
sessions.push_back(std::move(*session));
}
return sessions;
}
std::vector<ApexSession> ApexSession::GetSessionsInState(
SessionState::State state) {
auto sessions = GetSessions();
sessions.erase(
std::remove_if(sessions.begin(), sessions.end(),
[&](const ApexSession &s) { return s.GetState() != state; }),
sessions.end());
return sessions;
}
StatusOr<std::optional<ApexSession>> ApexSession::GetActiveSession() {
auto sessions = GetSessions();
std::optional<ApexSession> ret = std::nullopt;
for (const ApexSession& session : sessions) {
if (!session.IsFinalized()) {
if (ret) {
return StatusOr<std::optional<ApexSession>>::MakeError(
"More than one active session");
}
ret.emplace(session);
}
}
return StatusOr<std::optional<ApexSession>>(std::move(ret));
}
SessionState::State ApexSession::GetState() const { return state_.state(); }
int ApexSession::GetId() const { return state_.id(); }
std::string ApexSession::GetBuildFingerprint() const {
return state_.expected_build_fingerprint();
}
bool ApexSession::IsFinalized() const {
switch (GetState()) {
case SessionState::SUCCESS:
[[fallthrough]];
case SessionState::ACTIVATION_FAILED:
[[fallthrough]];
case SessionState::ROLLED_BACK:
[[fallthrough]];
case SessionState::ROLLBACK_FAILED:
return true;
default:
return false;
}
}
const google::protobuf::RepeatedField<int> ApexSession::GetChildSessionIds()
const {
return state_.child_session_ids();
}
void ApexSession::SetChildSessionIds(
const std::vector<int>& child_session_ids) {
*(state_.mutable_child_session_ids()) = {child_session_ids.begin(),
child_session_ids.end()};
}
void ApexSession::SetBuildFingerprint(const std::string& fingerprint) {
*(state_.mutable_expected_build_fingerprint()) = fingerprint;
}
Status ApexSession::UpdateStateAndCommit(
const SessionState::State& session_state) {
state_.set_state(session_state);
auto stateFilePath = getSessionStateFilePath(state_.id());
std::fstream stateFile(stateFilePath,
std::ios::out | std::ios::trunc | std::ios::binary);
if (!state_.SerializeToOstream(&stateFile)) {
return Status::Fail("Failed to write state file " + stateFilePath);
}
return Status::Success();
}
Status ApexSession::DeleteSession() const { return deleteSessionDir(GetId()); }
std::ostream& operator<<(std::ostream& out, const ApexSession& session) {
return out << "[id = " << session.GetId()
<< "; state = " << SessionState::State_Name(session.GetState())
<< "]";
}
} // namespace apex
} // namespace android
|
