diff options
Diffstat (limited to 'roots.c')
| -rw-r--r-- | roots.c | 370 |
1 files changed, 370 insertions, 0 deletions
diff --git a/roots.c b/roots.c new file mode 100644 index 000000000..6a6cf8adc --- /dev/null +++ b/roots.c @@ -0,0 +1,370 @@ +/* + * 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" }, + { "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; +} |