contrib/android/e2fsdroid.c

#include <stdio.h>
#include <getopt.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#include <ext2fs/ext2fs.h>

#include "perms.h"
#include "base_fs.h"
#include "block_list.h"
#include "basefs_allocator.h"
#include "create_inode.h"

static char *prog_name = "e2fsdroid";
static char *in_file;
static char *block_list;
static char *basefs_out;
static char *basefs_in;
static char *mountpoint = "";
static time_t fixed_time = -1;
static char *fs_config_file;
static struct selinux_opt seopt_file[8];
static int max_nr_opt = (int)sizeof(seopt_file) / sizeof(seopt_file[0]);
static char *product_out;
static char *src_dir;
static int android_configure;
static int android_sparse_file = 1;

static void usage(int ret)
{
	fprintf(stderr, "%s [-B block_list] [-D basefs_out] [-T timestamp]\n"
			"\t[-C fs_config] [-S file_contexts] [-p product_out]\n"
			"\t[-a mountpoint] [-d basefs_in] [-f src_dir] [-e] image\n",
                prog_name);
	exit(ret);
}

static char *absolute_path(const char *file)
{
	char *ret;
	char cwd[PATH_MAX];

	if (file[0] != '/') {
		getcwd(cwd, PATH_MAX);
		ret = malloc(strlen(cwd) + 1 + strlen(file) + 1);
		if (ret)
			sprintf(ret, "%s/%s", cwd, file);
	} else
		ret = strdup(file);
	return ret;
}

int main(int argc, char *argv[])
{
	int c;
	char *p;
	int flags = EXT2_FLAG_RW;
	errcode_t retval;
	io_manager io_mgr;
	ext2_filsys fs = NULL;
	struct fs_ops_callbacks fs_callbacks = { NULL, NULL };
	char *token;
	int nr_opt = 0;

	add_error_table(&et_ext2_error_table);

	while ((c = getopt (argc, argv, "T:C:S:p:a:D:d:B:f:e")) != EOF) {
		switch (c) {
		case 'T':
			fixed_time = strtoul(optarg, &p, 0);
			android_configure = 1;
			break;
		case 'C':
			fs_config_file = absolute_path(optarg);
			android_configure = 1;
			break;
		case 'S':
			token = strtok(optarg, ",");
			while (token) {
				if (nr_opt == max_nr_opt) {
					fprintf(stderr, "Expected at most %d selinux opts\n",
						max_nr_opt);
					exit(EXIT_FAILURE);
				}
				seopt_file[nr_opt].type = SELABEL_OPT_PATH;
				seopt_file[nr_opt].value = absolute_path(token);
				nr_opt++;
				token = strtok(NULL, ",");
			}
			android_configure = 1;
			break;
		case 'p':
			product_out = absolute_path(optarg);
			break;
		case 'a':
			mountpoint = strdup(optarg);
			break;
		case 'D':
			basefs_out = absolute_path(optarg);
			break;
		case 'd':
			basefs_in = absolute_path(optarg);
			break;
		case 'B':
			block_list = absolute_path(optarg);
			break;
		case 'f':
			src_dir = absolute_path(optarg);
			break;
		case 'e':
			android_sparse_file = 0;
			break;
		default:
			usage(EXIT_FAILURE);
		}
	}
	if (optind >= argc) {
		fprintf(stderr, "Expected filename after options\n");
		exit(EXIT_FAILURE);
	}

	if (android_sparse_file) {
		io_mgr = sparse_io_manager;
		if (asprintf(&in_file, "(%s)", argv[optind]) == -1) {
			fprintf(stderr, "Failed to allocate file name\n");
			exit(EXIT_FAILURE);
		}
	} else {
		io_mgr = unix_io_manager;
		in_file = strdup(argv[optind]);
	}
	retval = ext2fs_open(in_file, flags, 0, 0, io_mgr, &fs);
	if (retval) {
		com_err(prog_name, retval, "while opening file %s\n", in_file);
		return retval;
	}

	if (src_dir) {
		ext2fs_read_bitmaps(fs);
		if (basefs_in) {
			retval = base_fs_alloc_load(fs, basefs_in, mountpoint);
			if (retval) {
				com_err(prog_name, retval, "%s",
				"while reading base_fs file");
			    exit(1);
			}
			fs_callbacks.create_new_inode =
				base_fs_alloc_set_target;
			fs_callbacks.end_create_new_inode =
				base_fs_alloc_unset_target;
		}
		retval = populate_fs2(fs, EXT2_ROOT_INO, src_dir,
				      EXT2_ROOT_INO, &fs_callbacks);
		if (retval) {
			com_err(prog_name, retval, "%s",
			"while populating file system");
		    exit(1);
		}
		if (basefs_in)
			base_fs_alloc_cleanup(fs);
	}

	if (android_configure) {
		retval = android_configure_fs(fs, src_dir, product_out, mountpoint,
			seopt_file, nr_opt, fs_config_file, fixed_time);
		if (retval) {
			com_err(prog_name, retval, "%s",
				"while configuring the file system");
			exit(1);
		}
	}

	if (block_list) {
		retval = fsmap_iter_filsys(fs, &block_list_format, block_list,
					   mountpoint);
		if (retval) {
			com_err(prog_name, retval, "%s",
				"while creating the block_list");
			exit(1);
		}
	}

	if (basefs_out) {
		retval = fsmap_iter_filsys(fs, &base_fs_format,
					   basefs_out, mountpoint);
		if (retval) {
			com_err(prog_name, retval, "%s",
				"while creating the basefs file");
			exit(1);
		}
	}

	retval = ext2fs_close_free(&fs);
	if (retval) {
		com_err(prog_name, retval, "%s",
				"while writing superblocks");
		exit(1);
	}

	remove_error_table(&et_ext2_error_table);
	return 0;
}