mkbootfs: Add support for a dev node list file (99ab5210) · Commits · e / os / android_system_core

mkbootfs/mkbootfs.c

+111 −2

Original line number	Diff line number	Diff line

		#include <error.h>
		#include <errno.h>
		#include <getopt.h>
		#include <stdio.h>
		#include <stdlib.h>
		@@ -14,6 +16,8 @@
		#include <stdarg.h>
		#include <fcntl.h>

		#include <linux/kdev_t.h>

		#include <private/android_filesystem_config.h>
		#include <private/fs_config.h>

		@@ -335,21 +339,123 @@ static void read_canned_config(char* filename)
		fclose(f);
		}

		static void devnodes_desc_error(const char* filename, unsigned long line_num,
		const char* msg)
		{
		error(EXIT_FAILURE, 0, "failed to read nodes desc file '%s' line %lu: %s",
		filename, line_num, msg);
		}

		static int append_devnodes_desc_dir(char* path, char* args)
		{
		struct stat s;

		if (sscanf(args, "%o %d %d", &s.st_mode, &s.st_uid, &s.st_gid) != 3) return -1;

		s.st_mode \|= S_IFDIR;

		_eject(&s, path, strlen(path), NULL, 0);

		return 0;
		}

		static int append_devnodes_desc_nod(char* path, char* args)
		{
		int minor, major;
		struct stat s;
		char dev;

		if (sscanf(args, "%o %d %d %c %d %d", &s.st_mode, &s.st_uid, &s.st_gid,
		&dev, &major, &minor) != 6) return -1;

		s.st_rdev = MKDEV(major, minor);
		switch (dev) {
		case 'b':
		s.st_mode \|= S_IFBLK;
		break;
		case 'c':
		s.st_mode \|= S_IFCHR;
		break;
		default:
		return -1;
		}

		_eject(&s, path, strlen(path), NULL, 0);

		return 0;
		}

		static void append_devnodes_desc(const char* filename)
		{
		FILE* f = fopen(filename, "re");
		if (!f) error(EXIT_FAILURE, errno,
		"failed to open nodes description file '%s'", filename);

		char line, args, type, path;
		unsigned long line_num = 0;
		size_t allocated_len;

		while (getline(&line, &allocated_len, f) != -1) {
		char* type;

		line_num++;

		if (*line == '#') continue;

		if (!(type = strtok(line, " \t"))) {
		devnodes_desc_error(filename, line_num, "a type is missing");
		}

		if (*type == '\n') continue;

		if (!(path = strtok(NULL, " \t"))) {
		devnodes_desc_error(filename, line_num, "a path is missing");
		}

		if (!(args = strtok(NULL, "\n"))) {
		devnodes_desc_error(filename, line_num, "args are missing");
		}

		if (!strcmp(type, "dir")) {
		if (append_devnodes_desc_dir(path, args)) {
		devnodes_desc_error(filename, line_num, "bad arguments for dir");
		}
		} else if (!strcmp(type, "nod")) {
		if (append_devnodes_desc_nod(path, args)) {
		devnodes_desc_error(filename, line_num, "bad arguments for nod");
		}
		} else {
		devnodes_desc_error(filename, line_num, "type unknown");
		}
		}

		free(line);
		fclose(f);
		}

		static const struct option long_options[] = {
		{ "dirname", required_argument, NULL, 'd' },
		{ "file", required_argument, NULL, 'f' },
		{ "help", no_argument, NULL, 'h' },
		{ "nodes", required_argument, NULL, 'n' },
		{ NULL, 0, NULL, 0 },
		};

		static void usage(void)
		{
		fprintf(stderr,
		"Usage: mkbootfs [-d DIR\|-F FILE] DIR...\n"
		"Usage: mkbootfs [-n FILE] [-d DIR\|-F FILE] DIR...\n"
		"\n"
		"\t-d, --dirname=DIR: fs-config directory\n"
		"\t-f, --file=FILE: Canned configuration file\n"
		"\t-h, --help: Print this help\n"
		"\t-n, --nodes=FILE: Dev nodes description file\n"
		"\nDev nodes description:\n"
		"\t[dir\|nod] [perms] [uid] [gid] [c\|b] [minor] [major]\n"
		"\tExample:\n"
		"\t\t# My device nodes\n"
		"\t\tdir dev 0755 0 0\n"
		"\t\tnod dev/null 0600 0 0 c 1 5\n"
		);
		}

		@@ -357,7 +463,7 @@ int main(int argc, char *argv[])
		{
		int opt, unused;

		while ((opt = getopt_long(argc, argv, "hd:f:", long_options, &unused)) != -1) {
		while ((opt = getopt_long(argc, argv, "hd:f:n:", long_options, &unused)) != -1) {
		switch (opt) {
		case 'd':
		target_out_path = argv[optind - 1];
		@@ -368,6 +474,9 @@ int main(int argc, char *argv[])
		case 'h':
		usage();
		return 0;
		case 'n':
		append_devnodes_desc(argv[optind - 1]);
		break;
		default:
		usage();
		die("Unknown option %s", argv[optind - 1]);