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      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 
     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 
     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:
     46     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 
     58     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 
     66     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 
     74     status_t umountVendor() const override {
     75         return umount("/vendor");
     76     }
     77 };
     78 
     79 } // namespace details
     80 
     81 // static
     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