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 <android-base/properties.h>
20 #include <sys/mount.h>
21 #include <fs_mgr.h>
22
23 #include "utils.h"
24
25 namespace android {
26 namespace vintf {
27
28 namespace details {
29 using FstabMgr = std::unique_ptr<struct fstab, decltype(&fs_mgr_free_fstab)>;
30
mountAt(const FstabMgr & fstab,const char * path,const char * mount_point)31 static status_t mountAt(const FstabMgr &fstab, const char* path, const char* mount_point) {
32 fstab_rec* rec = fs_mgr_get_entry_for_mount_point(fstab.get(), path);
33 if (rec == nullptr) {
34 return UNKNOWN_ERROR;
35 }
36 int result = mount(rec->blk_device, mount_point, rec->fs_type, rec->flags, rec->fs_options);
37 return result == 0 ? OK : -errno;
38 }
39
defaultFstabMgr()40 static FstabMgr defaultFstabMgr() {
41 return FstabMgr{fs_mgr_read_fstab_default(), &fs_mgr_free_fstab};
42 }
43
44 class RecoveryPartitionMounter : public PartitionMounter {
45 public:
mountSystem() const46 status_t mountSystem() const override {
47 FstabMgr fstab = defaultFstabMgr();
48 if (fstab == NULL) {
49 return UNKNOWN_ERROR;
50 }
51 if (android::base::GetBoolProperty("ro.build.system_root_image", false)) {
52 return mountAt(fstab, "/", "/system_root");
53 } else {
54 return mountAt(fstab, "/system", "/system");
55 }
56 }
57
mountVendor() const58 status_t mountVendor() const override {
59 FstabMgr fstab = defaultFstabMgr();
60 if (fstab == NULL) {
61 return UNKNOWN_ERROR;
62 }
63 return mountAt(fstab, "/vendor", "/vendor");
64 }
65
umountSystem() const66 status_t umountSystem() const override {
67 if (android::base::GetBoolProperty("ro.build.system_root_image", false)) {
68 return umount("/system_root");
69 } else {
70 return umount("/system");
71 }
72 }
73
umountVendor() const74 status_t umountVendor() const override {
75 return umount("/vendor");
76 }
77 };
78
79 } // namespace details
80
81 // static
CheckCompatibility(const std::vector<std::string> & xmls,std::string * error)82 int32_t VintfObjectRecovery::CheckCompatibility(
83 const std::vector<std::string> &xmls, std::string *error) {
84 static details::RecoveryPartitionMounter mounter;
85 return details::checkCompatibility(xmls, true /* mount */, mounter, error);
86 }
87
88
89 } // namespace vintf
90 } // namespace android
91