Add lptools to modify dynamic partitions

This commit is contained in:
Pierre-Hugues Husson 2020-05-09 14:24:38 +02:00
parent c85213c6f1
commit 186496633e
2 changed files with 223 additions and 0 deletions

View File

@ -182,3 +182,31 @@ cc_binary {
"libhidlbase", "libhidlbase",
], ],
} }
cc_binary {
name: "lptools",
cflags: [
"-Werror",
"-Wextra",
],
device_supported: true,
shared_libs: [
"libbase",
"liblog",
"liblp",
"libsparse",
"libfs_mgr",
"libutils",
"libcutils",
],
static_libs: [
"libdm",
],
srcs: [
"lptools.cc",
],
cppflags: [
"-D_FILE_OFFSET_BITS=64",
],
}

195
cmds/lptools.cc Normal file
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@ -0,0 +1,195 @@
/*
* Copyright (C) 2018 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 <getopt.h>
#include <inttypes.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/statvfs.h>
#include <sys/types.h>
#include <sysexits.h>
#include <unistd.h>
#include <iostream>
#include <optional>
#include <regex>
#include <string>
#include <vector>
#include <chrono>
#include <android-base/parseint.h>
#include <android-base/properties.h>
#include <android-base/strings.h>
#include <cutils/android_get_control_file.h>
#include <fs_mgr.h>
#include <liblp/builder.h>
#include <liblp/liblp.h>
#include <fs_mgr_dm_linear.h>
#include <libdm/dm.h>
using namespace android;
using namespace android::fs_mgr;
class FileOrBlockDeviceOpener final : public PartitionOpener {
public:
android::base::unique_fd Open(const std::string& path, int flags) const override {
// Try a local file first.
android::base::unique_fd fd;
#ifdef __ANDROID__
fd.reset(android_get_control_file(path.c_str()));
if (fd >= 0) return fd;
#endif
fd.reset(open(path.c_str(), flags));
if (fd >= 0) return fd;
return PartitionOpener::Open(path, flags);
}
};
static FileOrBlockDeviceOpener opener;
std::unique_ptr<MetadataBuilder> makeBuilder() {
MetadataBuilder::OverrideABForTesting(false);
auto builder = MetadataBuilder::New(opener, "super", 0);
if(builder == nullptr) {
std::cout << "Failed creating super builder" << std::endl;
}
return builder;
}
void saveToDisk(std::unique_ptr<MetadataBuilder> builder) {
auto newMetadata = builder->Export();
int nSlots = 2;//pt->geometry.metadata_slot_count;
for(int slot=0; slot < nSlots; slot++) {
std::cout << "Saving the updated partition table " << UpdatePartitionTable(opener, "super", *newMetadata, slot) << " for slot " << slot << std::endl;
}
}
int main(int argc, char **argv) {
if(argc<=1) {
std::cerr << "Usage: " << argv[0] << " <create|remove|resize|rename>" << std::endl;
exit(1);
}
auto builder = makeBuilder();
if(strcmp(argv[1], "create") == 0) {
if(argc != 4) {
std::cerr << "Usage: " << argv[0] << " create <partition name> <partition size>" << std::endl;
exit(1);
}
auto partName = argv[2];
auto size = strtoll(argv[3], NULL, 0);
auto partition = builder->FindPartition(partName);
if(partition != nullptr) {
std::cerr << "Partition " << partName << " already exists." << std::endl;
exit(1);
}
partition = builder->AddPartition(partName, "main", 0);
std::cout << "Growing partition " << builder->ResizePartition(partition, size) << std::endl;
saveToDisk(std::move(builder));
std::string dmPath;
auto dmCreateRes = android::fs_mgr::CreateLogicalPartition(
"/dev/block/by-name/super",
0, partName,
true,
std::chrono::milliseconds(10000), &dmPath);
std::cout << "Creating dm partition for " << partName << " answered " << dmCreateRes << " at " << dmPath << std::endl;
exit(0);
} else if(strcmp(argv[1], "remove") == 0) {
if(argc != 3) {
std::cerr << "Usage: " << argv[0] << " remove <partition name>" << std::endl;
exit(1);
}
auto partName = argv[2];
auto dmState = android::dm::DeviceMapper::Instance().GetState(partName);
if(dmState == android::dm::DmDeviceState::ACTIVE) {
android::fs_mgr::DestroyLogicalPartition(partName, std::chrono::milliseconds(2000));
}
builder->RemovePartition(partName);
saveToDisk(std::move(builder));
exit(0);
} else if(strcmp(argv[1], "resize") == 0) {
if(argc != 4) {
std::cerr << "Usage: " << argv[0] << " resize <partition name> <newsize>" << std::endl;
exit(1);
}
auto partName = argv[2];
auto size = strtoll(argv[3], NULL, 0);
auto partition = builder->FindPartition(partName);
std::cout << "Resizing partition " << builder->ResizePartition(partition, size) << std::endl;
saveToDisk(std::move(builder));
exit(0);
} else if(strcmp(argv[1], "replace") == 0) {
if(argc != 4) {
std::cerr << "Usage: " << argv[0] << " replace <original partition name> <new partition name>" << std::endl;
std::cerr << "This will delete <new partition name> and rename <original partition name> to <new partition name>" << std::endl;
exit(1);
}
auto src = argv[2];
auto dst = argv[3];
auto srcPartition = builder->FindPartition(src);
std::vector<std::unique_ptr<Extent>> originalExtents;
const auto& extents = srcPartition->extents();
for(unsigned i=0; i<extents.size(); i++) {
const auto& extend = extents[i];
auto linear = extend->AsLinearExtent();
std::cerr << (linear != nullptr) << std::endl;
if(linear != nullptr) {
auto copyLinear = std::make_unique<LinearExtent>(linear->num_sectors(), linear->device_index(), linear->physical_sector());
originalExtents.push_back(std::move(copyLinear));
} else {
auto copyZero = std::make_unique<ZeroExtent>(extend->num_sectors());
originalExtents.push_back(std::move(copyZero));
}
}
builder->RemovePartition(src);
builder->RemovePartition(dst);
auto newDstPartition = builder->AddPartition(dst, "main", 0);
for(auto&& extent: originalExtents) {
newDstPartition->AddExtent(std::move(extent));
}
saveToDisk(std::move(builder));
exit(0);
} else if(strcmp(argv[1], "map") == 0) {
if(argc != 3) {
std::cerr << "Usage: " << argv[0] << " map <partition name>" << std::endl;
exit(1);
}
auto partName = argv[2];
std::string dmPath;
auto dmCreateRes = android::fs_mgr::CreateLogicalPartition(
"/dev/block/by-name/super",
0, partName,
true,
std::chrono::milliseconds(10000), &dmPath);
std::cout << "Creating dm partition for " << partName << " answered " << dmCreateRes << " at " << dmPath << std::endl;
exit(0);
} else if(strcmp(argv[1], "unmap") == 0) {
if(argc != 3) {
std::cerr << "Usage: " << argv[0] << " unmap <partition name>" << std::endl;
exit(1);
}
auto partName = argv[2];
auto dmState = android::dm::DeviceMapper::Instance().GetState(partName);
if(dmState == android::dm::DmDeviceState::ACTIVE) {
android::fs_mgr::DestroyLogicalPartition(partName, std::chrono::milliseconds(2000));
}
exit(0);
}
return 0;
}