Move parts of roots.cpp to libfs_mgr (6e232ed3) · Commits · e / os / android_bootable_recovery

roots.cpp

+7 −124

Original line number	Diff line number	Diff line
		@@ -39,13 +39,12 @@
		#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";

		extern struct selabel_handle* sehandle;

		@@ -77,130 +76,18 @@ 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;
		}

		// 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;
		return android::fs_mgr::EnsurePathMounted(fstab, path, mount_point) ? 0 : -1;
		}

		int ensure_path_mounted(const char* 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);
		return android::fs_mgr::EnsurePathUnmounted(fstab, path) ? 0 : -1;
		}

		static int exec_cmd(const std::vector<std::string>& args) {
		@@ -249,7 +136,7 @@ static int64_t get_file_size(int fd, uint64_t reserve_len) {
		}

		int format_volume(const char* volume, const char* directory) {
		const Volume* v = volume_for_path(volume);
		const Volume* v = android::fs_mgr::GetEntryForPath(fstab, volume);
		if (v == nullptr) {
		LOG(ERROR) << "unknown volume \"" << volume << "\"";
		return -1;
		@@ -407,13 +294,9 @@ 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();
		}

tests/Android.bp

+1 −0

Original line number	Diff line number	Diff line
		@@ -94,6 +94,7 @@ librecovery_static_libs = [
		"libhidltransport",
		"libhwbinder_noltopgo",
		"libbinderthreadstate",
		"liblp",
		"libvndksupport",
		"libtinyxml2",
		]