1 /*
2 * Copyright (C) 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "VintfObjectRecovery.h"
18
19 #include <sys/mount.h>
20 #include <fs_mgr.h>
21
22 #include "utils.h"
23
24 namespace android {
25 namespace vintf {
26
27 namespace details {
28 using FstabMgr = std::unique_ptr<struct fstab, decltype(&fs_mgr_free_fstab)>;
29
mountAt(const FstabMgr & fstab,const char * path,const char * mount_point)30 static status_t mountAt(const FstabMgr &fstab, const char* path, const char* mount_point) {
31 fstab_rec* rec = fs_mgr_get_entry_for_mount_point(fstab.get(), path);
32 if (rec == nullptr) {
33 return UNKNOWN_ERROR;
34 }
35 int result = mount(rec->blk_device, mount_point, rec->fs_type, rec->flags, rec->fs_options);
36 return result == 0 ? OK : -errno;
37 }
38
defaultFstabMgr()39 static FstabMgr defaultFstabMgr() {
40 return FstabMgr{fs_mgr_read_fstab_default(), &fs_mgr_free_fstab};
41 }
42
43 class RecoveryPartitionMounter : public PartitionMounter {
44 public:
mountSystem() const45 status_t mountSystem() const override {
46 FstabMgr fstab = defaultFstabMgr();
47 if (fstab == NULL) {
48 return UNKNOWN_ERROR;
49 }
50 if (getPropertyFetcher().getBoolProperty("ro.build.system_root_image", false)) {
51 return mountAt(fstab, "/", "/system_root");
52 } else {
53 return mountAt(fstab, "/system", "/system");
54 }
55 }
56
mountVendor() const57 status_t mountVendor() const override {
58 FstabMgr fstab = defaultFstabMgr();
59 if (fstab == NULL) {
60 return UNKNOWN_ERROR;
61 }
62 return mountAt(fstab, "/vendor", "/vendor");
63 }
64
umountSystem() const65 status_t umountSystem() const override {
66 if (getPropertyFetcher().getBoolProperty("ro.build.system_root_image", false)) {
67 return umount("/system_root");
68 } else {
69 return umount("/system");
70 }
71 }
72
umountVendor() const73 status_t umountVendor() const override {
74 return umount("/vendor");
75 }
76 };
77
78 } // namespace details
79
80 // static
CheckCompatibility(const std::vector<std::string> & xmls,std::string * error)81 int32_t VintfObjectRecovery::CheckCompatibility(
82 const std::vector<std::string> &xmls, std::string *error) {
83 static details::RecoveryPartitionMounter mounter;
84 return details::checkCompatibility(xmls, true /* mount */, mounter, error);
85 }
86
87
88 } // namespace vintf
89 } // namespace android
90