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/*
* Copyright (C) 2015 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 <stdio.h>
#include <string>
#include "fs_mgr.h"
#include "fs_mgr_priv.h"
// https://source.android.com/devices/tech/ota/ab/ab_implement#partitions
// All partitions that are A/B-ed should be named as follows (slots are always
// named a, b, etc.): boot_a, boot_b, system_a, system_b, vendor_a, vendor_b.
static std::string other_suffix(const std::string& slot_suffix) {
if (slot_suffix == "_a") {
return "_b";
}
if (slot_suffix == "_b") {
return "_a";
}
return "";
}
// Returns "_b" or "_a", which is *the other* slot of androidboot.slot_suffix
// in kernel cmdline, or an empty string if that parameter does not exist.
std::string fs_mgr_get_other_slot_suffix() {
return other_suffix(fs_mgr_get_slot_suffix());
}
// Returns "_a" or "_b" based on androidboot.slot_suffix in kernel cmdline, or an empty string
// if that parameter does not exist.
std::string fs_mgr_get_slot_suffix() {
std::string ab_suffix;
fs_mgr_get_boot_config("slot_suffix", &ab_suffix);
return ab_suffix;
}
// Updates |fstab| for slot_suffix. Returns true on success, false on error.
bool fs_mgr_update_for_slotselect(Fstab* fstab) {
std::string ab_suffix;
for (auto& entry : *fstab) {
if (!entry.fs_mgr_flags.slot_select && !entry.fs_mgr_flags.slot_select_other) {
continue;
}
if (ab_suffix.empty()) {
ab_suffix = fs_mgr_get_slot_suffix();
// Return false if failed to get ab_suffix when MF_SLOTSELECT is specified.
if (ab_suffix.empty()) return false;
}
const auto& update_suffix =
entry.fs_mgr_flags.slot_select ? ab_suffix : other_suffix(ab_suffix);
entry.blk_device = entry.blk_device + update_suffix;
entry.logical_partition_name = entry.logical_partition_name + update_suffix;
}
return true;
}
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