/* * Copyright (C) 2007 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 <errno.h> #include <stdlib.h> #include <sys/mount.h> #include <sys/stat.h> #include <sys/types.h> #include <unistd.h> #include "mtdutils/mtdutils.h" #include "mtdutils/mounts.h" #include "minzip/Zip.h" #include "roots.h" #include "common.h" typedef struct { const char *name; const char *device; const char *device2; // If the first one doesn't work (may be NULL) const char *partition_name; const char *mount_point; const char *filesystem; } RootInfo; /* Canonical pointers. xxx may just want to use enums */ static const char g_mtd_device[] = "@\0g_mtd_device"; static const char g_raw[] = "@\0g_raw"; static const char g_package_file[] = "@\0g_package_file"; static RootInfo g_roots[] = { { "BOOT:", g_mtd_device, NULL, "boot", NULL, g_raw }, { "CACHE:", g_mtd_device, NULL, "cache", "/cache", "yaffs2" }, { "DATA:", g_mtd_device, NULL, "userdata", "/data", "yaffs2" }, { "MISC:", g_mtd_device, NULL, "misc", NULL, g_raw }, { "PACKAGE:", NULL, NULL, NULL, NULL, g_package_file }, { "RECOVERY:", g_mtd_device, NULL, "recovery", "/", g_raw }, { "SDCARD:", "/dev/block/mmcblk0p1", "/dev/block/mmcblk0", NULL, "/sdcard", "vfat" }, { "SYSTEM:", g_mtd_device, NULL, "system", "/system", "yaffs2" }, { "MBM:", g_mtd_device, NULL, "mbm", NULL, g_raw }, { "TMP:", NULL, NULL, NULL, "/tmp", NULL }, }; #define NUM_ROOTS (sizeof(g_roots) / sizeof(g_roots[0])) // TODO: for SDCARD:, try /dev/block/mmcblk0 if mmcblk0p1 fails static const RootInfo * get_root_info_for_path(const char *root_path) { const char *c; /* Find the first colon. */ c = root_path; while (*c != '\0' && *c != ':') { c++; } if (*c == '\0') { return NULL; } size_t len = c - root_path + 1; size_t i; for (i = 0; i < NUM_ROOTS; i++) { RootInfo *info = &g_roots[i]; if (strncmp(info->name, root_path, len) == 0) { return info; } } return NULL; } static const ZipArchive *g_package = NULL; static char *g_package_path = NULL; int register_package_root(const ZipArchive *package, const char *package_path) { if (package != NULL) { package_path = strdup(package_path); if (package_path == NULL) { return -1; } g_package_path = (char *)package_path; } else { free(g_package_path); g_package_path = NULL; } g_package = package; return 0; } int is_package_root_path(const char *root_path) { const RootInfo *info = get_root_info_for_path(root_path); return info != NULL && info->filesystem == g_package_file; } const char * translate_package_root_path(const char *root_path, char *out_buf, size_t out_buf_len, const ZipArchive **out_package) { const RootInfo *info = get_root_info_for_path(root_path); if (info == NULL || info->filesystem != g_package_file) { return NULL; } /* Strip the package root off of the path. */ size_t root_len = strlen(info->name); root_path += root_len; size_t root_path_len = strlen(root_path); if (out_buf_len < root_path_len + 1) { return NULL; } strcpy(out_buf, root_path); *out_package = g_package; return out_buf; } /* Takes a string like "SYSTEM:lib" and turns it into a string * like "/system/lib". The translated path is put in out_buf, * and out_buf is returned if the translation succeeded. */ const char * translate_root_path(const char *root_path, char *out_buf, size_t out_buf_len) { if (out_buf_len < 1) { return NULL; } const RootInfo *info = get_root_info_for_path(root_path); if (info == NULL || info->mount_point == NULL) { return NULL; } /* Find the relative part of the non-root part of the path. */ root_path += strlen(info->name); // strip off the "root:" while (*root_path != '\0' && *root_path == '/') { root_path++; } size_t mp_len = strlen(info->mount_point); size_t rp_len = strlen(root_path); if (mp_len + 1 + rp_len + 1 > out_buf_len) { return NULL; } /* Glue the mount point to the relative part of the path. */ memcpy(out_buf, info->mount_point, mp_len); if (out_buf[mp_len - 1] != '/') out_buf[mp_len++] = '/'; memcpy(out_buf + mp_len, root_path, rp_len); out_buf[mp_len + rp_len] = '\0'; return out_buf; } static int internal_root_mounted(const RootInfo *info) { if (info->mount_point == NULL) { return -1; } //xxx if TMP: (or similar) just say "yes" /* See if this root is already mounted. */ int ret = scan_mounted_volumes(); if (ret < 0) { return ret; } const MountedVolume *volume; volume = find_mounted_volume_by_mount_point(info->mount_point); if (volume != NULL) { /* It's already mounted. */ return 0; } return -1; } int is_root_path_mounted(const char *root_path) { const RootInfo *info = get_root_info_for_path(root_path); if (info == NULL) { return -1; } return internal_root_mounted(info) >= 0; } int ensure_root_path_mounted(const char *root_path) { const RootInfo *info = get_root_info_for_path(root_path); if (info == NULL) { return -1; } int ret = internal_root_mounted(info); if (ret >= 0) { /* It's already mounted. */ return 0; } /* It's not mounted. */ if (info->device == g_mtd_device) { if (info->partition_name == NULL) { return -1; } //TODO: make the mtd stuff scan once when it needs to mtd_scan_partitions(); const MtdPartition *partition; partition = mtd_find_partition_by_name(info->partition_name); if (partition == NULL) { return -1; } return mtd_mount_partition(partition, info->mount_point, info->filesystem, 0); } if (info->device == NULL || info->mount_point == NULL || info->filesystem == NULL || info->filesystem == g_raw || info->filesystem == g_package_file) { return -1; } mkdir(info->mount_point, 0755); // in case it doesn't already exist if (mount(info->device, info->mount_point, info->filesystem, MS_NOATIME | MS_NODEV | MS_NODIRATIME, "")) { if (info->device2 == NULL) { LOGE("Can't mount %s\n(%s)\n", info->device, strerror(errno)); return -1; } else if (mount(info->device2, info->mount_point, info->filesystem, MS_NOATIME | MS_NODEV | MS_NODIRATIME, "")) { LOGE("Can't mount %s (or %s)\n(%s)\n", info->device, info->device2, strerror(errno)); return -1; } } return 0; } int ensure_root_path_unmounted(const char *root_path) { const RootInfo *info = get_root_info_for_path(root_path); if (info == NULL) { return -1; } if (info->mount_point == NULL) { /* This root can't be mounted, so by definition it isn't. */ return 0; } //xxx if TMP: (or similar) just return error /* See if this root is already mounted. */ int ret = scan_mounted_volumes(); if (ret < 0) { return ret; } const MountedVolume *volume; volume = find_mounted_volume_by_mount_point(info->mount_point); if (volume == NULL) { /* It's not mounted. */ return 0; } return unmount_mounted_volume(volume); } const MtdPartition * get_root_mtd_partition(const char *root_path) { const RootInfo *info = get_root_info_for_path(root_path); if (info == NULL || info->device != g_mtd_device || info->partition_name == NULL) { return NULL; } mtd_scan_partitions(); return mtd_find_partition_by_name(info->partition_name); } int format_root_device(const char *root) { /* Be a little safer here; require that "root" is just * a device with no relative path after it. */ const char *c = root; while (*c != '\0' && *c != ':') { c++; } if (c[0] != ':' || c[1] != '\0') { LOGW("format_root_device: bad root name \"%s\"\n", root); return -1; } const RootInfo *info = get_root_info_for_path(root); if (info == NULL || info->device == NULL) { LOGW("format_root_device: can't resolve \"%s\"\n", root); return -1; } if (info->mount_point != NULL) { /* Don't try to format a mounted device. */ int ret = ensure_root_path_unmounted(root); if (ret < 0) { LOGW("format_root_device: can't unmount \"%s\"\n", root); return ret; } } /* Format the device. */ if (info->device == g_mtd_device) { mtd_scan_partitions(); const MtdPartition *partition; partition = mtd_find_partition_by_name(info->partition_name); if (partition == NULL) { LOGW("format_root_device: can't find mtd partition \"%s\"\n", info->partition_name); return -1; } if (info->filesystem == g_raw || !strcmp(info->filesystem, "yaffs2")) { MtdWriteContext *write = mtd_write_partition(partition); if (write == NULL) { LOGW("format_root_device: can't open \"%s\"\n", root); return -1; } else if (mtd_erase_blocks(write, -1) == (off_t) -1) { LOGW("format_root_device: can't erase \"%s\"\n", root); mtd_write_close(write); return -1; } else if (mtd_write_close(write)) { LOGW("format_root_device: can't close \"%s\"\n", root); return -1; } else { return 0; } } } //TODO: handle other device types (sdcard, etc.) LOGW("format_root_device: can't handle non-mtd device \"%s\"\n", root); return -1; }