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-rw-r--r--roots.cpp215
1 files changed, 47 insertions, 168 deletions
diff --git a/roots.cpp b/roots.cpp
index 7dc4ec3d9..e988da0a8 100644
--- a/roots.cpp
+++ b/roots.cpp
@@ -29,6 +29,7 @@
#include <unistd.h>
#include <algorithm>
+#include <iostream>
#include <string>
#include <vector>
@@ -39,168 +40,53 @@
#include <cryptfs.h>
#include <ext4_utils/wipe.h>
#include <fs_mgr.h>
+#include <fs_mgr/roots.h>
#include <fs_mgr_dm_linear.h>
#include "otautil/mounts.h"
-static struct fstab* fstab = nullptr;
-static bool did_map_logical_partitions = false;
-static constexpr const char* SYSTEM_ROOT = "/system";
+static Fstab fstab;
extern struct selabel_handle* sehandle;
void load_volume_table() {
- fstab = fs_mgr_read_fstab_default();
- if (!fstab) {
+ if (!ReadDefaultFstab(&fstab)) {
LOG(ERROR) << "Failed to read default fstab";
return;
}
- int ret = fs_mgr_add_entry(fstab, "/tmp", "ramdisk", "ramdisk");
- if (ret == -1) {
- LOG(ERROR) << "Failed to add /tmp entry to fstab";
- fs_mgr_free_fstab(fstab);
- fstab = nullptr;
- return;
- }
+ fstab.emplace_back(FstabEntry{
+ .mount_point = "/tmp", .fs_type = "ramdisk", .blk_device = "ramdisk", .length = 0 });
- printf("recovery filesystem table\n");
- printf("=========================\n");
- for (int i = 0; i < fstab->num_entries; ++i) {
- const Volume* v = &fstab->recs[i];
- printf(" %d %s %s %s %" PRId64 "\n", i, v->mount_point, v->fs_type, v->blk_device, v->length);
+ std::cout << "recovery filesystem table" << std::endl << "=========================" << std::endl;
+ for (size_t i = 0; i < fstab.size(); ++i) {
+ const auto& entry = fstab[i];
+ std::cout << " " << i << " " << entry.mount_point << " "
+ << " " << entry.fs_type << " " << entry.blk_device << " " << entry.length
+ << std::endl;
}
- printf("\n");
+ std::cout << std::endl;
}
Volume* volume_for_mount_point(const std::string& mount_point) {
- return fs_mgr_get_entry_for_mount_point(fstab, mount_point);
-}
-
-// Finds the volume specified by the given path. fs_mgr_get_entry_for_mount_point() does exact match
-// only, so it attempts the prefixes recursively (e.g. "/cache/recovery/last_log",
-// "/cache/recovery", "/cache", "/" for a given path of "/cache/recovery/last_log") and returns the
-// first match or nullptr.
-static Volume* volume_for_path(const char* path) {
- if (path == nullptr || path[0] == '\0') return nullptr;
- std::string str(path);
- while (true) {
- Volume* result = fs_mgr_get_entry_for_mount_point(fstab, str);
- if (result != nullptr || str == "/") {
- return result;
- }
- size_t slash = str.find_last_of('/');
- if (slash == std::string::npos) return nullptr;
- if (slash == 0) {
- str = "/";
- } else {
- str = str.substr(0, slash);
- }
- }
- return nullptr;
+ auto it = std::find_if(fstab.begin(), fstab.end(), [&mount_point](const auto& entry) {
+ return entry.mount_point == mount_point;
+ });
+ return it == fstab.end() ? nullptr : &*it;
}
// Mount the volume specified by path at the given mount_point.
-int ensure_path_mounted_at(const char* path, const char* mount_point) {
- Volume* v = volume_for_path(path);
- if (v == nullptr) {
- LOG(ERROR) << "unknown volume for path [" << path << "]";
- return -1;
- }
- if (strcmp(v->fs_type, "ramdisk") == 0) {
- // The ramdisk is always mounted.
- return 0;
- }
-
- if (!scan_mounted_volumes()) {
- LOG(ERROR) << "Failed to scan mounted volumes";
- return -1;
- }
-
- if (!mount_point) {
- mount_point = v->mount_point;
- }
-
- // If we can't acquire the block device for a logical partition, it likely
- // was never created. In that case we try to create it.
- if (fs_mgr_is_logical(v) && !fs_mgr_update_logical_partition(v)) {
- if (did_map_logical_partitions) {
- LOG(ERROR) << "Failed to find block device for partition";
- return -1;
- }
- std::string super_name = fs_mgr_get_super_partition_name();
- if (!android::fs_mgr::CreateLogicalPartitions(super_name)) {
- LOG(ERROR) << "Failed to create logical partitions";
- return -1;
- }
- did_map_logical_partitions = true;
- if (!fs_mgr_update_logical_partition(v)) {
- LOG(ERROR) << "Failed to find block device for partition";
- return -1;
- }
- }
-
- const MountedVolume* mv = find_mounted_volume_by_mount_point(mount_point);
- if (mv != nullptr) {
- // Volume is already mounted.
- return 0;
- }
-
- mkdir(mount_point, 0755); // in case it doesn't already exist
-
- if (strcmp(v->fs_type, "ext4") == 0 || strcmp(v->fs_type, "squashfs") == 0 ||
- strcmp(v->fs_type, "vfat") == 0 || strcmp(v->fs_type, "f2fs") == 0) {
- int result = mount(v->blk_device, mount_point, v->fs_type, v->flags, v->fs_options);
- if (result == -1 && fs_mgr_is_formattable(v)) {
- PLOG(ERROR) << "Failed to mount " << mount_point << "; formatting";
- bool crypt_footer = fs_mgr_is_encryptable(v) && !strcmp(v->key_loc, "footer");
- if (fs_mgr_do_format(v, crypt_footer) == 0) {
- result = mount(v->blk_device, mount_point, v->fs_type, v->flags, v->fs_options);
- } else {
- PLOG(ERROR) << "Failed to format " << mount_point;
- return -1;
- }
- }
-
- if (result == -1) {
- PLOG(ERROR) << "Failed to mount " << mount_point;
- return -1;
- }
- return 0;
- }
-
- LOG(ERROR) << "unknown fs_type \"" << v->fs_type << "\" for " << mount_point;
- return -1;
+int ensure_path_mounted_at(const std::string& path, const std::string& mount_point) {
+ return android::fs_mgr::EnsurePathMounted(&fstab, path, mount_point) ? 0 : -1;
}
-int ensure_path_mounted(const char* path) {
+int ensure_path_mounted(const std::string& path) {
// Mount at the default mount point.
- return ensure_path_mounted_at(path, nullptr);
+ return android::fs_mgr::EnsurePathMounted(&fstab, path) ? 0 : -1;
}
-int ensure_path_unmounted(const char* path) {
- const Volume* v = volume_for_path(path);
- if (v == nullptr) {
- LOG(ERROR) << "unknown volume for path [" << path << "]";
- return -1;
- }
- if (strcmp(v->fs_type, "ramdisk") == 0) {
- // The ramdisk is always mounted; you can't unmount it.
- return -1;
- }
-
- if (!scan_mounted_volumes()) {
- LOG(ERROR) << "Failed to scan mounted volumes";
- return -1;
- }
-
- MountedVolume* mv = find_mounted_volume_by_mount_point(v->mount_point);
- if (mv == nullptr) {
- // Volume is already unmounted.
- return 0;
- }
-
- return unmount_mounted_volume(mv);
+int ensure_path_unmounted(const std::string& path) {
+ return android::fs_mgr::EnsurePathUnmounted(&fstab, path) ? 0 : -1;
}
static int exec_cmd(const std::vector<std::string>& args) {
@@ -248,17 +134,17 @@ static int64_t get_file_size(int fd, uint64_t reserve_len) {
return computed_size;
}
-int format_volume(const char* volume, const char* directory) {
- const Volume* v = volume_for_path(volume);
+int format_volume(const std::string& volume, const std::string& directory) {
+ const FstabEntry* v = android::fs_mgr::GetEntryForPath(&fstab, volume);
if (v == nullptr) {
LOG(ERROR) << "unknown volume \"" << volume << "\"";
return -1;
}
- if (strcmp(v->fs_type, "ramdisk") == 0) {
+ if (v->fs_type == "ramdisk") {
LOG(ERROR) << "can't format_volume \"" << volume << "\"";
return -1;
}
- if (strcmp(v->mount_point, volume) != 0) {
+ if (v->mount_point != volume) {
LOG(ERROR) << "can't give path \"" << volume << "\" to format_volume";
return -1;
}
@@ -266,16 +152,16 @@ int format_volume(const char* volume, const char* directory) {
LOG(ERROR) << "format_volume: Failed to unmount \"" << v->mount_point << "\"";
return -1;
}
- if (strcmp(v->fs_type, "ext4") != 0 && strcmp(v->fs_type, "f2fs") != 0) {
+ if (v->fs_type != "ext4" && v->fs_type != "f2fs") {
LOG(ERROR) << "format_volume: fs_type \"" << v->fs_type << "\" unsupported";
return -1;
}
// If there's a key_loc that looks like a path, it should be a block device for storing encryption
// metadata. Wipe it too.
- if (v->key_loc != nullptr && v->key_loc[0] == '/') {
+ if (!v->key_loc.empty() && v->key_loc[0] == '/') {
LOG(INFO) << "Wiping " << v->key_loc;
- int fd = open(v->key_loc, O_WRONLY | O_CREAT, 0644);
+ int fd = open(v->key_loc.c_str(), O_WRONLY | O_CREAT, 0644);
if (fd == -1) {
PLOG(ERROR) << "format_volume: Failed to open " << v->key_loc;
return -1;
@@ -287,9 +173,8 @@ int format_volume(const char* volume, const char* directory) {
int64_t length = 0;
if (v->length > 0) {
length = v->length;
- } else if (v->length < 0 ||
- (v->key_loc != nullptr && strcmp(v->key_loc, "footer") == 0)) {
- android::base::unique_fd fd(open(v->blk_device, O_RDONLY));
+ } else if (v->length < 0 || v->key_loc == "footer") {
+ android::base::unique_fd fd(open(v->blk_device.c_str(), O_RDONLY));
if (fd == -1) {
PLOG(ERROR) << "format_volume: failed to open " << v->blk_device;
return -1;
@@ -303,7 +188,7 @@ int format_volume(const char* volume, const char* directory) {
}
}
- if (strcmp(v->fs_type, "ext4") == 0) {
+ if (v->fs_type == "ext4") {
static constexpr int kBlockSize = 4096;
std::vector<std::string> mke2fs_args = {
"/system/bin/mke2fs", "-F", "-t", "ext4", "-b", std::to_string(kBlockSize),
@@ -326,7 +211,7 @@ int format_volume(const char* volume, const char* directory) {
}
int result = exec_cmd(mke2fs_args);
- if (result == 0 && directory != nullptr) {
+ if (result == 0 && !directory.empty()) {
std::vector<std::string> e2fsdroid_args = {
"/system/bin/e2fsdroid", "-e", "-f", directory, "-a", volume, v->blk_device,
};
@@ -355,7 +240,7 @@ int format_volume(const char* volume, const char* directory) {
}
int result = exec_cmd(make_f2fs_cmd);
- if (result == 0 && directory != nullptr) {
+ if (result == 0 && !directory.empty()) {
cmd = "/sbin/sload.f2fs";
// clang-format off
std::vector<std::string> sload_f2fs_cmd = {
@@ -374,31 +259,29 @@ int format_volume(const char* volume, const char* directory) {
return 0;
}
-int format_volume(const char* volume) {
- return format_volume(volume, nullptr);
+int format_volume(const std::string& volume) {
+ return format_volume(volume, "");
}
int setup_install_mounts() {
- if (fstab == nullptr) {
+ if (fstab.empty()) {
LOG(ERROR) << "can't set up install mounts: no fstab loaded";
return -1;
}
- for (int i = 0; i < fstab->num_entries; ++i) {
- const Volume* v = fstab->recs + i;
-
+ for (const FstabEntry& entry : fstab) {
// We don't want to do anything with "/".
- if (strcmp(v->mount_point, "/") == 0) {
+ if (entry.mount_point == "/") {
continue;
}
- if (strcmp(v->mount_point, "/tmp") == 0 || strcmp(v->mount_point, "/cache") == 0) {
- if (ensure_path_mounted(v->mount_point) != 0) {
- LOG(ERROR) << "Failed to mount " << v->mount_point;
+ if (entry.mount_point == "/tmp" || entry.mount_point == "/cache") {
+ if (ensure_path_mounted(entry.mount_point) != 0) {
+ LOG(ERROR) << "Failed to mount " << entry.mount_point;
return -1;
}
} else {
- if (ensure_path_unmounted(v->mount_point) != 0) {
- LOG(ERROR) << "Failed to unmount " << v->mount_point;
+ if (ensure_path_unmounted(entry.mount_point) != 0) {
+ LOG(ERROR) << "Failed to unmount " << entry.mount_point;
return -1;
}
}
@@ -407,13 +290,9 @@ int setup_install_mounts() {
}
bool logical_partitions_mapped() {
- return did_map_logical_partitions;
+ return android::fs_mgr::LogicalPartitionsMapped();
}
std::string get_system_root() {
- if (volume_for_mount_point(SYSTEM_ROOT) == nullptr) {
- return "/";
- } else {
- return SYSTEM_ROOT;
- }
+ return android::fs_mgr::GetSystemRoot();
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-04 07:07:48 +0100