1 /*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <stdbool.h>
18 #include <stdio.h>
19 #include <stdlib.h>
20 #include <unistd.h>
21
22 #include <private/android_filesystem_config.h>
23
24 /*
25 * This program expects android_device_dirs and android_device_files
26 * to be defined in the supplied android_filesystem_config.h file in
27 * the device/<vendor>/<product> $(TARGET_DEVICE_DIR). Then generates
28 * the binary format used in the /system/etc/fs_config_dirs and
29 * the /system/etc/fs_config_files to be used by the runtimes.
30 */
31 #include "android_filesystem_config.h"
32
33 #ifdef NO_ANDROID_FILESYSTEM_CONFIG_DEVICE_DIRS
34 static const struct fs_path_config android_device_dirs[] = {
35 };
36 #endif
37
38 #ifdef NO_ANDROID_FILESYSTEM_CONFIG_DEVICE_FILES
39 static const struct fs_path_config android_device_files[] = {
40 #ifdef NO_ANDROID_FILESYSTEM_CONFIG_DEVICE_DIRS
41 { 0, AID_ROOT, AID_ROOT, 0, "system/etc/fs_config_dirs" },
42 #endif
43 { 0, AID_ROOT, AID_ROOT, 0, "system/etc/fs_config_files" },
44 };
45 #endif
46
usage()47 static void usage() {
48 fprintf(stderr,
49 "Generate binary content for fs_config_dirs (-D) and fs_config_files (-F)\n"
50 "from device-specific android_filesystem_config.h override\n\n"
51 "Usage: fs_config_generate -D|-F [-o output-file]\n");
52 }
53
main(int argc,char ** argv)54 int main(int argc, char** argv) {
55 const struct fs_path_config *pc;
56 const struct fs_path_config *end;
57 bool dir = false, file = false;
58 FILE *fp = stdout;
59 int opt;
60
61 while((opt = getopt(argc, argv, "DFho:")) != -1) {
62 switch(opt) {
63 case 'D':
64 if (file) {
65 fprintf(stderr, "Must specify only -D or -F\n");
66 usage();
67 exit(EXIT_FAILURE);
68 }
69 dir = true;
70 break;
71 case 'F':
72 if (dir) {
73 fprintf(stderr, "Must specify only -F or -D\n");
74 usage();
75 exit(EXIT_FAILURE);
76 }
77 file = true;
78 break;
79 case 'o':
80 if (fp != stdout) {
81 fprintf(stderr, "Specify only one output file\n");
82 usage();
83 exit(EXIT_FAILURE);
84 }
85 fp = fopen(optarg, "wb");
86 if (fp == NULL) {
87 fprintf(stderr, "Can not open \"%s\"\n", optarg);
88 exit(EXIT_FAILURE);
89 }
90 break;
91 case 'h':
92 usage();
93 exit(EXIT_SUCCESS);
94 default:
95 usage();
96 exit(EXIT_FAILURE);
97 }
98 }
99
100 if (!file && !dir) {
101 fprintf(stderr, "Must specify either -F or -D\n");
102 usage();
103 exit(EXIT_FAILURE);
104 }
105
106 if (dir) {
107 pc = android_device_dirs;
108 end = &android_device_dirs[sizeof(android_device_dirs) / sizeof(android_device_dirs[0])];
109 } else {
110 pc = android_device_files;
111 end = &android_device_files[sizeof(android_device_files) / sizeof(android_device_files[0])];
112 }
113 for(; (pc < end) && pc->prefix; pc++) {
114 char buffer[512];
115 ssize_t len = fs_config_generate(buffer, sizeof(buffer), pc);
116 if (len < 0) {
117 fprintf(stderr, "Entry too large\n");
118 exit(EXIT_FAILURE);
119 }
120 if (fwrite(buffer, 1, len, fp) != (size_t)len) {
121 fprintf(stderr, "Write failure\n");
122 exit(EXIT_FAILURE);
123 }
124 }
125 fclose(fp);
126
127 return 0;
128 }
129