fs_config: Add fs_config_generate
fs_config_generate_$(TARGET_DEVICE) is built based off the content
of $(TARGET_ANDROID_FILESYSTEM_CONFIG_H). We also add the rules
fs_config_dirs and fs_config_file to utilize this command
for target contents:
fs_config_generate_$(TARGET_DEVICE) -D -o system/etc/fs_config_dir
fs_config_generate_$(TARGET_DEVICE) -F -o system/etc/fs_config_file
In order to use this feature, one must have the fs_config_dirs and
fs_config_files in the $(PRODUCT_PACKAGES) list defined in the
device make files in $(TARGET_DEVICE_DIR). And either an
android_filesystem_config.h file in that directory, or define a
path in TARGET_ANDROID_FILESYSTEM_CONFIG_H to point to one.
Bug: 19908228
Change-Id: Iee1543d99169f874e0915ae07962a7750ecb6342
diff --git a/tools/fs_config/fs_config_generate.c b/tools/fs_config/fs_config_generate.c
new file mode 100644
index 0000000..87769c7
--- /dev/null
+++ b/tools/fs_config/fs_config_generate.c
@@ -0,0 +1,128 @@
+/*
+ * 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 <stdbool.h>
+#include <stdio.h>
+#include <stdlib.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.
+ */
+#include "android_filesystem_config.h"
+
+#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
+ { 0, AID_ROOT, AID_ROOT, 0, "system/etc/fs_config_dirs" },
+#endif
+ { 0, AID_ROOT, AID_ROOT, 0, "system/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\n\n"
+ "Usage: fs_config_generate -D|-F [-o output-file]\n");
+}
+
+int main(int argc, char** argv) {
+ const struct fs_path_config *pc;
+ const struct fs_path_config *end;
+ bool dir = false, file = false;
+ FILE *fp = stdout;
+ int opt;
+
+ while((opt = getopt(argc, argv, "DFho:")) != -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 'o':
+ if (fp != stdout) {
+ fprintf(stderr, "Specify only one output file\n");
+ usage();
+ exit(EXIT_FAILURE);
+ }
+ fp = fopen(optarg, "w");
+ 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 (!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[sizeof(android_device_dirs) / sizeof(android_device_dirs[0])];
+ } else {
+ pc = android_device_files;
+ end = &android_device_files[sizeof(android_device_files) / sizeof(android_device_files[0])];
+ }
+ for(; (pc < end) && pc->prefix; pc++) {
+ 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);
+ }
+ if (fwrite(buffer, 1, len, fp) != (size_t)len) {
+ fprintf(stderr, "Write failure\n");
+ exit(EXIT_FAILURE);
+ }
+ }
+ fclose(fp);
+
+ return 0;
+}