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/*
* Copyright (C) 2015 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 <ctype.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <private/android_filesystem_config.h>
/*
* This program expects android_device_dirs and android_device_files
* to be defined in the supplied android_filesystem_config.h file in
* the device/<vendor>/<product> $(TARGET_DEVICE_DIR). Then generates
* the binary format used in the /system/etc/fs_config_dirs and
* the /system/etc/fs_config_files to be used by the runtimes.
*/
#ifdef ANDROID_FILESYSTEM_CONFIG
#include ANDROID_FILESYSTEM_CONFIG
#else
#include "android_filesystem_config.h"
#endif
#ifdef NO_ANDROID_FILESYSTEM_CONFIG_DEVICE_DIRS
static const struct fs_path_config android_device_dirs[] = { };
#endif
#ifdef NO_ANDROID_FILESYSTEM_CONFIG_DEVICE_FILES
static const struct fs_path_config android_device_files[] = {
#ifdef NO_ANDROID_FILESYSTEM_CONFIG_DEVICE_DIRS
{0000, AID_ROOT, AID_ROOT, 0, "system/etc/fs_config_dirs"},
{0000, AID_ROOT, AID_ROOT, 0, "vendor/etc/fs_config_dirs"},
{0000, AID_ROOT, AID_ROOT, 0, "oem/etc/fs_config_dirs"},
{0000, AID_ROOT, AID_ROOT, 0, "odm/etc/fs_config_dirs"},
#endif
{0000, AID_ROOT, AID_ROOT, 0, "system/etc/fs_config_files"},
{0000, AID_ROOT, AID_ROOT, 0, "vendor/etc/fs_config_files"},
{0000, AID_ROOT, AID_ROOT, 0, "oem/etc/fs_config_files"},
{0000, AID_ROOT, AID_ROOT, 0, "odm/etc/fs_config_files"},
};
#endif
static void usage() {
fprintf(stderr,
"Generate binary content for fs_config_dirs (-D) and fs_config_files (-F)\n"
"from device-specific android_filesystem_config.h override. Filter based\n"
"on a comma separated partition list (-P) whitelist or prefixed by a\n"
"minus blacklist. Partitions are identified as path references to\n"
"<partition>/ or system/<partition>/\n\n"
"Usage: fs_config_generate -D|-F [-P list] [-o output-file]\n");
}
/* If tool switches to C++, use android-base/macros.h array_size() */
#ifndef ARRAY_SIZE /* popular macro */
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
#endif
int main(int argc, char** argv) {
const struct fs_path_config* pc;
const struct fs_path_config* end;
bool dir = false, file = false;
const char* partitions = NULL;
FILE* fp = stdout;
int opt;
static const char optstring[] = "DFP:ho:";
while ((opt = getopt(argc, argv, optstring)) != -1) {
switch (opt) {
case 'D':
if (file) {
fprintf(stderr, "Must specify only -D or -F\n");
usage();
exit(EXIT_FAILURE);
}
dir = true;
break;
case 'F':
if (dir) {
fprintf(stderr, "Must specify only -F or -D\n");
usage();
exit(EXIT_FAILURE);
}
file = true;
break;
case 'P':
if (partitions) {
fprintf(stderr, "Specify only one partition list\n");
usage();
exit(EXIT_FAILURE);
}
while (*optarg && isspace(*optarg)) ++optarg;
if (!optarg[0]) {
fprintf(stderr, "Partition list empty\n");
usage();
exit(EXIT_FAILURE);
}
if (!optarg[1]) {
fprintf(stderr, "Partition list too short \"%s\"\n", optarg);
usage();
exit(EXIT_FAILURE);
}
if ((optarg[0] == '-') && strchr(optstring, optarg[1]) && !optarg[2]) {
fprintf(stderr, "Partition list is a flag \"%s\"\n", optarg);
usage();
exit(EXIT_FAILURE);
}
partitions = optarg;
break;
case 'o':
if (fp != stdout) {
fprintf(stderr, "Specify only one output file\n");
usage();
exit(EXIT_FAILURE);
}
fp = fopen(optarg, "wb");
if (fp == NULL) {
fprintf(stderr, "Can not open \"%s\"\n", optarg);
exit(EXIT_FAILURE);
}
break;
case 'h':
usage();
exit(EXIT_SUCCESS);
default:
usage();
exit(EXIT_FAILURE);
}
}
if (optind < argc) {
fprintf(stderr, "Unknown non-argument \"%s\"\n", argv[optind]);
usage();
exit(EXIT_FAILURE);
}
if (!file && !dir) {
fprintf(stderr, "Must specify either -F or -D\n");
usage();
exit(EXIT_FAILURE);
}
if (dir) {
pc = android_device_dirs;
end = &android_device_dirs[ARRAY_SIZE(android_device_dirs)];
} else {
pc = android_device_files;
end = &android_device_files[ARRAY_SIZE(android_device_files)];
}
for (; (pc < end) && pc->prefix; pc++) {
bool submit;
char buffer[512];
ssize_t len = fs_config_generate(buffer, sizeof(buffer), pc);
if (len < 0) {
fprintf(stderr, "Entry too large\n");
exit(EXIT_FAILURE);
}
submit = true;
if (partitions) {
char* partitions_copy = strdup(partitions);
char* arg = partitions_copy;
char* sv = NULL; /* Do not leave uninitialized, NULL is known safe. */
/* Deal with case all iterated partitions are blacklists with no match */
bool all_blacklist_but_no_match = true;
submit = false;
if (!partitions_copy) {
fprintf(stderr, "Failed to allocate a copy of %s\n", partitions);
exit(EXIT_FAILURE);
}
/* iterate through (officially) comma separated list of partitions */
while (!!(arg = strtok_r(arg, ",:; \t\n\r\f", &sv))) {
static const char system[] = "system/";
size_t plen;
bool blacklist = false;
if (*arg == '-') {
blacklist = true;
++arg;
} else {
all_blacklist_but_no_match = false;
}
plen = strlen(arg);
/* deal with evil callers */
while (arg[plen - 1] == '/') {
--plen;
}
/* check if we have <partition>/ or /system/<partition>/ */
if ((!strncmp(pc->prefix, arg, plen) && (pc->prefix[plen] == '/')) ||
(!strncmp(pc->prefix, system, strlen(system)) &&
!strncmp(pc->prefix + strlen(system), arg, plen) &&
(pc->prefix[strlen(system) + plen] == '/'))) {
all_blacklist_but_no_match = false;
/* we have a match !!! */
if (!blacklist) submit = true;
break;
}
arg = NULL;
}
free(partitions_copy);
if (all_blacklist_but_no_match) submit = true;
}
if (submit && (fwrite(buffer, 1, len, fp) != (size_t)len)) {
fprintf(stderr, "Write failure\n");
exit(EXIT_FAILURE);
}
}
fclose(fp);
return 0;
}
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