summaryrefslogtreecommitdiffstats
path: root/roots.c
blob: 762bdf3820be516e1a84d99c03ed5e7ef31fa3f7 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
/*
 * 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"

#ifdef USE_EXT4
#include "make_ext4fs.h"
#endif

#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 const char g_ramdisk[] = "@\0g_ramdisk";

static RootInfo g_roots[] = {
    { "BOOT:", g_mtd_device, NULL, "boot", NULL, g_raw },
    { "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", g_ramdisk },

#ifdef USE_EXT4
    { "CACHE:", "/dev/block/platform/sdhci-tegra.3/by-name/cache", NULL, NULL,
      "/cache", "ext4" },
    { "DATA:", "/dev/block/platform/sdhci-tegra.3/by-name/userdata", NULL, NULL,
      "/data", "ext4" },
#else
    { "CACHE:", g_mtd_device, NULL, "cache", "/cache", "yaffs2" },
    { "DATA:", g_mtd_device, NULL, "userdata", "/data", "yaffs2" },
#endif

};
#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;
    }
    if (info->filesystem == g_ramdisk) {
      return 0;
    }

    /* 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;
            }
        }
    }

#ifdef USE_EXT4
    if (strcmp(info->filesystem, "ext4") == 0) {
        reset_ext4fs_info();
        int result = make_ext4fs(info->device, NULL, NULL, 0, 0);
        if (result != 0) {
            LOGW("make_ext4fs failed: %d\n", result);
            return -1;
        }
        return 0;
    }
#endif

//TODO: handle other device types (sdcard, etc.)

    LOGW("format_root_device: unknown device \"%s\"\n", root);
    return -1;
}