usr/gen_init_cpio.c - kernel/msm-4.9 - Gitiles

 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <string.h>
 #include <unistd.h>
 #include <time.h>
 #include <fcntl.h>
 #include <errno.h>
 #include <ctype.h>
 #include <limits.h>

 /*
  * Original work by Jeff Garzik
  *
  * External file lists, symlink, pipe and fifo support by Thayne Harbaugh
  */

 #define xstr(s) #s
 #define str(s) xstr(s)

 static unsigned int offset;
 static unsigned int ino = 721;

 struct file_handler {
 	const char *type;
 	int (*handler)(const char *line);
 };

 static void push_string(const char *name)
 {
 	unsigned int name_len = strlen(name) + 1;

 	fputs(name, stdout);
 	putchar(0);
 	offset += name_len;
 }

 static void push_pad (void)
 {
 	while (offset & 3) {
 		putchar(0);
 		offset++;
 	}
 }

 static void push_rest(const char *name)
 {
 	unsigned int name_len = strlen(name) + 1;
 	unsigned int tmp_ofs;

 	fputs(name, stdout);
 	putchar(0);
 	offset += name_len;

 	tmp_ofs = name_len + 110;
 	while (tmp_ofs & 3) {
 		putchar(0);
 		offset++;
 		tmp_ofs++;
 	}
 }

 static void push_hdr(const char *s)
 {
 	fputs(s, stdout);
 	offset += 110;
 }

 static void cpio_trailer(void)
 {
 	char s[256];
 	const char name[] = "TRAILER!!!";

 	sprintf(s, "%s%08X%08X%08lX%08lX%08X%08lX"
 	       "%08X%08X%08X%08X%08X%08X%08X",
 		"070701",		/* magic */
 		0,			/* ino */
 		0,			/* mode */
 		(long) 0,		/* uid */
 		(long) 0,		/* gid */
 		1,			/* nlink */
 		(long) 0,		/* mtime */
 		0,			/* filesize */
 		0,			/* major */
 		0,			/* minor */
 		0,			/* rmajor */
 		0,			/* rminor */
 		(unsigned)strlen(name)+1, /* namesize */
 		0);			/* chksum */
 	push_hdr(s);
 	push_rest(name);

 	while (offset % 512) {
 		putchar(0);
 		offset++;
 	}
 }

 static int cpio_mkslink(const char *name, const char *target,
 			 unsigned int mode, uid_t uid, gid_t gid)
 {
 	char s[256];
 	time_t mtime = time(NULL);

 	sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
 	       "%08X%08X%08X%08X%08X%08X%08X",
 		"070701",		/* magic */
 		ino++,			/* ino */
 		S_IFLNK | mode,		/* mode */
 		(long) uid,		/* uid */
 		(long) gid,		/* gid */
 		1,			/* nlink */
 		(long) mtime,		/* mtime */
 		(unsigned)strlen(target)+1, /* filesize */
 		3,			/* major */
 		1,			/* minor */
 		0,			/* rmajor */
 		0,			/* rminor */
 		(unsigned)strlen(name) + 1,/* namesize */
 		0);			/* chksum */
 	push_hdr(s);
 	push_string(name);
 	push_pad();
 	push_string(target);
 	push_pad();
 	return 0;
 }

 static int cpio_mkslink_line(const char *line)
 {
 	char name[PATH_MAX + 1];
 	char target[PATH_MAX + 1];
 	unsigned int mode;
 	int uid;
 	int gid;
 	int rc = -1;

 	if (5 != sscanf(line, "%" str(PATH_MAX) "s %" str(PATH_MAX) "s %o %d %d", name, target, &mode, &uid, &gid)) {
 		fprintf(stderr, "Unrecognized dir format '%s'", line);
 		goto fail;
 	}
 	rc = cpio_mkslink(name, target, mode, uid, gid);
  fail:
 	return rc;
 }

 static int cpio_mkgeneric(const char *name, unsigned int mode,
 		       uid_t uid, gid_t gid)
 {
 	char s[256];
 	time_t mtime = time(NULL);

 	sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
 	       "%08X%08X%08X%08X%08X%08X%08X",
 		"070701",		/* magic */
 		ino++,			/* ino */
 		mode,			/* mode */
 		(long) uid,		/* uid */
 		(long) gid,		/* gid */
 		2,			/* nlink */
 		(long) mtime,		/* mtime */
 		0,			/* filesize */
 		3,			/* major */
 		1,			/* minor */
 		0,			/* rmajor */
 		0,			/* rminor */
 		(unsigned)strlen(name) + 1,/* namesize */
 		0);			/* chksum */
 	push_hdr(s);
 	push_rest(name);
 	return 0;
 }

 enum generic_types {
 	GT_DIR,
 	GT_PIPE,
 	GT_SOCK
 };

 struct generic_type {
 	const char *type;
 	mode_t mode;
 };

 static struct generic_type generic_type_table[] = {
 	[GT_DIR] = {
 		.type = "dir",
 		.mode = S_IFDIR
 	},
 	[GT_PIPE] = {
 		.type = "pipe",
 		.mode = S_IFIFO
 	},
 	[GT_SOCK] = {
 		.type = "sock",
 		.mode = S_IFSOCK
 	}
 };

 static int cpio_mkgeneric_line(const char *line, enum generic_types gt)
 {
 	char name[PATH_MAX + 1];
 	unsigned int mode;
 	int uid;
 	int gid;
 	int rc = -1;

 	if (4 != sscanf(line, "%" str(PATH_MAX) "s %o %d %d", name, &mode, &uid, &gid)) {
 		fprintf(stderr, "Unrecognized %s format '%s'",
 			line, generic_type_table[gt].type);
 		goto fail;
 	}
 	mode |= generic_type_table[gt].mode;
 	rc = cpio_mkgeneric(name, mode, uid, gid);
  fail:
 	return rc;
 }

 static int cpio_mkdir_line(const char *line)
 {
 	return cpio_mkgeneric_line(line, GT_DIR);
 }

 static int cpio_mkpipe_line(const char *line)
 {
 	return cpio_mkgeneric_line(line, GT_PIPE);
 }

 static int cpio_mksock_line(const char *line)
 {
 	return cpio_mkgeneric_line(line, GT_SOCK);
 }

 static int cpio_mknod(const char *name, unsigned int mode,
 		       uid_t uid, gid_t gid, char dev_type,
 		       unsigned int maj, unsigned int min)
 {
 	char s[256];
 	time_t mtime = time(NULL);

 	if (dev_type == 'b')
 		mode |= S_IFBLK;
 	else
 		mode |= S_IFCHR;

 	sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
 	       "%08X%08X%08X%08X%08X%08X%08X",
 		"070701",		/* magic */
 		ino++,			/* ino */
 		mode,			/* mode */
 		(long) uid,		/* uid */
 		(long) gid,		/* gid */
 		1,			/* nlink */
 		(long) mtime,		/* mtime */
 		0,			/* filesize */
 		3,			/* major */
 		1,			/* minor */
 		maj,			/* rmajor */
 		min,			/* rminor */
 		(unsigned)strlen(name) + 1,/* namesize */
 		0);			/* chksum */
 	push_hdr(s);
 	push_rest(name);
 	return 0;
 }

 static int cpio_mknod_line(const char *line)
 {
 	char name[PATH_MAX + 1];
 	unsigned int mode;
 	int uid;
 	int gid;
 	char dev_type;
 	unsigned int maj;
 	unsigned int min;
 	int rc = -1;

 	if (7 != sscanf(line, "%" str(PATH_MAX) "s %o %d %d %c %u %u",
 			 name, &mode, &uid, &gid, &dev_type, &maj, &min)) {
 		fprintf(stderr, "Unrecognized nod format '%s'", line);
 		goto fail;
 	}
 	rc = cpio_mknod(name, mode, uid, gid, dev_type, maj, min);
  fail:
 	return rc;
 }

 /* Not marked static to keep the compiler quiet, as no one uses this yet... */
 static int cpio_mkfile(const char *name, const char *location,
 			unsigned int mode, uid_t uid, gid_t gid)
 {
 	char s[256];
 	char *filebuf = NULL;
 	struct stat buf;
 	int file = -1;
 	int retval;
 	int rc = -1;

 	mode |= S_IFREG;

 	retval = stat (location, &buf);
 	if (retval) {
 		fprintf (stderr, "File %s could not be located\n", location);
 		goto error;
 	}

 	file = open (location, O_RDONLY);
 	if (file < 0) {
 		fprintf (stderr, "File %s could not be opened for reading\n", location);
 		goto error;
 	}

 	filebuf = malloc(buf.st_size);
 	if (!filebuf) {
 		fprintf (stderr, "out of memory\n");
 		goto error;
 	}

 	retval = read (file, filebuf, buf.st_size);
 	if (retval < 0) {
 		fprintf (stderr, "Can not read %s file\n", location);
 		goto error;
 	}

 	sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
 	       "%08X%08X%08X%08X%08X%08X%08X",
 		"070701",		/* magic */
 		ino++,			/* ino */
 		mode,			/* mode */
 		(long) uid,		/* uid */
 		(long) gid,		/* gid */
 		1,			/* nlink */
 		(long) buf.st_mtime,	/* mtime */
 		(int) buf.st_size,	/* filesize */
 		3,			/* major */
 		1,			/* minor */
 		0,			/* rmajor */
 		0,			/* rminor */
 		(unsigned)strlen(name) + 1,/* namesize */
 		0);			/* chksum */
 	push_hdr(s);
 	push_string(name);
 	push_pad();

 	fwrite(filebuf, buf.st_size, 1, stdout);
 	offset += buf.st_size;
 	push_pad();
 	rc = 0;

 error:
 	if (filebuf) free(filebuf);
 	if (file >= 0) close(file);
 	return rc;
 }

 static int cpio_mkfile_line(const char *line)
 {
 	char name[PATH_MAX + 1];
 	char location[PATH_MAX + 1];
 	unsigned int mode;
 	int uid;
 	int gid;
 	int rc = -1;

 	if (5 != sscanf(line, "%" str(PATH_MAX) "s %" str(PATH_MAX) "s %o %d %d", name, location, &mode, &uid, &gid)) {
 		fprintf(stderr, "Unrecognized file format '%s'", line);
 		goto fail;
 	}
 	rc = cpio_mkfile(name, location, mode, uid, gid);
  fail:
 	return rc;
 }

 void usage(const char *prog)
 {
 	fprintf(stderr, "Usage:\n"
 		"\t%s <cpio_list>\n"
 		"\n"
 		"<cpio_list> is a file containing newline separated entries that\n"
 		"describe the files to be included in the initramfs archive:\n"
 		"\n"
 		"# a comment\n"
 		"file <name> <location> <mode> <uid> <gid>\n"
 		"dir <name> <mode> <uid> <gid>\n"
 		"nod <name> <mode> <uid> <gid> <dev_type> <maj> <min>\n"
 		"slink <name> <target> <mode> <uid> <gid>\n"
 		"pipe <name> <mode> <uid> <gid>\n"
 		"sock <name> <mode> <uid> <gid>\n"
 		"\n"
 		"<name>      name of the file/dir/nod/etc in the archive\n"
 		"<location>  location of the file in the current filesystem\n"
 		"<target>    link target\n"
 		"<mode>      mode/permissions of the file\n"
 		"<uid>       user id (0=root)\n"
 		"<gid>       group id (0=root)\n"
 		"<dev_type>  device type (b=block, c=character)\n"
 		"<maj>       major number of nod\n"
 		"<min>       minor number of nod\n"
 		"\n"
 		"example:\n"
 		"# A simple initramfs\n"
 		"dir /dev 0755 0 0\n"
 		"nod /dev/console 0600 0 0 c 5 1\n"
 		"dir /root 0700 0 0\n"
 		"dir /sbin 0755 0 0\n"
 		"file /sbin/kinit /usr/src/klibc/kinit/kinit 0755 0 0\n",
 		prog);
 }

 struct file_handler file_handler_table[] = {
 	{
 		.type    = "file",
 		.handler = cpio_mkfile_line,
 	}, {
 		.type    = "nod",
 		.handler = cpio_mknod_line,
 	}, {
 		.type    = "dir",
 		.handler = cpio_mkdir_line,
 	}, {
 		.type    = "slink",
 		.handler = cpio_mkslink_line,
 	}, {
 		.type    = "pipe",
 		.handler = cpio_mkpipe_line,
 	}, {
 		.type    = "sock",
 		.handler = cpio_mksock_line,
 	}, {
 		.type    = NULL,
 		.handler = NULL,
 	}
 };

 #define LINE_SIZE (2 * PATH_MAX + 50)

 int main (int argc, char *argv[])
 {
 	FILE *cpio_list;
 	char line[LINE_SIZE];
 	char *args, *type;
 	int ec = 0;
 	int line_nr = 0;

 	if (2 != argc) {
 		usage(argv[0]);
 		exit(1);
 	}

 	if (! (cpio_list = fopen(argv[1], "r"))) {
 		fprintf(stderr, "ERROR: unable to open '%s': %s\n\n",
 			argv[1], strerror(errno));
 		usage(argv[0]);
 		exit(1);
 	}

 	while (fgets(line, LINE_SIZE, cpio_list)) {
 		int type_idx;
 		size_t slen = strlen(line);

 		line_nr++;

 		if ('#' == *line) {
 			/* comment - skip to next line */
 			continue;
 		}

 		if (! (type = strtok(line, " \t"))) {
 			fprintf(stderr,
 				"ERROR: incorrect format, could not locate file type line %d: '%s'\n",
 				line_nr, line);
 			ec = -1;
 		}

 		if ('\n' == *type) {
 			/* a blank line */
 			continue;
 		}

 		if (slen == strlen(type)) {
 			/* must be an empty line */
 			continue;
 		}

 		if (! (args = strtok(NULL, "\n"))) {
 			fprintf(stderr,
 				"ERROR: incorrect format, newline required line %d: '%s'\n",
 				line_nr, line);
 			ec = -1;
 		}

 		for (type_idx = 0; file_handler_table[type_idx].type; type_idx++) {
 			int rc;
 			if (! strcmp(line, file_handler_table[type_idx].type)) {
 				if ((rc = file_handler_table[type_idx].handler(args))) {
 					ec = rc;
 					fprintf(stderr, " line %d\n", line_nr);
 				}
 				break;
 			}
 		}

 		if (NULL == file_handler_table[type_idx].type) {
 			fprintf(stderr, "unknown file type line %d: '%s'\n",
 				line_nr, line);
 		}
 	}
 	cpio_trailer();

 	exit(ec);
 }
	#include <stdio.h>
	#include <stdlib.h>
	#include <sys/types.h>
	#include <sys/stat.h>
	#include <string.h>
	#include <unistd.h>
	#include <time.h>
	#include <fcntl.h>
	#include <errno.h>
	#include <ctype.h>
	#include <limits.h>

	/*
	* Original work by Jeff Garzik
	*
	* External file lists, symlink, pipe and fifo support by Thayne Harbaugh
	*/

	#define xstr(s) #s
	#define str(s) xstr(s)

	static unsigned int offset;
	static unsigned int ino = 721;

	struct file_handler {
	const char *type;
	int (handler)(const char line);
	};

	static void push_string(const char *name)
	{
	unsigned int name_len = strlen(name) + 1;

	fputs(name, stdout);
	putchar(0);
	offset += name_len;
	}

	static void push_pad (void)
	{
	while (offset & 3) {
	putchar(0);
	offset++;
	}
	}

	static void push_rest(const char *name)
	{
	unsigned int name_len = strlen(name) + 1;
	unsigned int tmp_ofs;

	fputs(name, stdout);
	putchar(0);
	offset += name_len;

	tmp_ofs = name_len + 110;
	while (tmp_ofs & 3) {
	putchar(0);
	offset++;
	tmp_ofs++;
	}
	}

	static void push_hdr(const char *s)
	{
	fputs(s, stdout);
	offset += 110;
	}

	static void cpio_trailer(void)
	{
	char s[256];
	const char name[] = "TRAILER!!!";

	sprintf(s, "%s%08X%08X%08lX%08lX%08X%08lX"
	"%08X%08X%08X%08X%08X%08X%08X",
	"070701", /* magic */
	0, /* ino */
	0, /* mode */
	(long) 0, /* uid */
	(long) 0, /* gid */
	1, /* nlink */
	(long) 0, /* mtime */
	0, /* filesize */
	0, /* major */
	0, /* minor */
	0, /* rmajor */
	0, /* rminor */
	(unsigned)strlen(name)+1, /* namesize */
	0); /* chksum */
	push_hdr(s);
	push_rest(name);

	while (offset % 512) {
	putchar(0);
	offset++;
	}
	}

	static int cpio_mkslink(const char name, const char target,
	unsigned int mode, uid_t uid, gid_t gid)
	{
	char s[256];
	time_t mtime = time(NULL);

	sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
	"%08X%08X%08X%08X%08X%08X%08X",
	"070701", /* magic */
	ino++, /* ino */
	S_IFLNK \| mode, /* mode */
	(long) uid, /* uid */
	(long) gid, /* gid */
	1, /* nlink */
	(long) mtime, /* mtime */
	(unsigned)strlen(target)+1, /* filesize */
	3, /* major */
	1, /* minor */
	0, /* rmajor */
	0, /* rminor */
	(unsigned)strlen(name) + 1,/* namesize */
	0); /* chksum */
	push_hdr(s);
	push_string(name);
	push_pad();
	push_string(target);
	push_pad();
	return 0;
	}

	static int cpio_mkslink_line(const char *line)
	{
	char name[PATH_MAX + 1];
	char target[PATH_MAX + 1];
	unsigned int mode;
	int uid;
	int gid;
	int rc = -1;

	if (5 != sscanf(line, "%" str(PATH_MAX) "s %" str(PATH_MAX) "s %o %d %d", name, target, &mode, &uid, &gid)) {
	fprintf(stderr, "Unrecognized dir format '%s'", line);
	goto fail;
	}
	rc = cpio_mkslink(name, target, mode, uid, gid);
	fail:
	return rc;
	}

	static int cpio_mkgeneric(const char *name, unsigned int mode,
	uid_t uid, gid_t gid)
	{
	char s[256];
	time_t mtime = time(NULL);

	sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
	"%08X%08X%08X%08X%08X%08X%08X",
	"070701", /* magic */
	ino++, /* ino */
	mode, /* mode */
	(long) uid, /* uid */
	(long) gid, /* gid */
	2, /* nlink */
	(long) mtime, /* mtime */
	0, /* filesize */
	3, /* major */
	1, /* minor */
	0, /* rmajor */
	0, /* rminor */
	(unsigned)strlen(name) + 1,/* namesize */
	0); /* chksum */
	push_hdr(s);
	push_rest(name);
	return 0;
	}

	enum generic_types {
	GT_DIR,
	GT_PIPE,
	GT_SOCK
	};

	struct generic_type {
	const char *type;
	mode_t mode;
	};

	static struct generic_type generic_type_table[] = {
	[GT_DIR] = {
	.type = "dir",
	.mode = S_IFDIR
	},
	[GT_PIPE] = {
	.type = "pipe",
	.mode = S_IFIFO
	},
	[GT_SOCK] = {
	.type = "sock",
	.mode = S_IFSOCK
	}
	};

	static int cpio_mkgeneric_line(const char *line, enum generic_types gt)
	{
	char name[PATH_MAX + 1];
	unsigned int mode;
	int uid;
	int gid;
	int rc = -1;

	if (4 != sscanf(line, "%" str(PATH_MAX) "s %o %d %d", name, &mode, &uid, &gid)) {
	fprintf(stderr, "Unrecognized %s format '%s'",
	line, generic_type_table[gt].type);
	goto fail;
	}
	mode \|= generic_type_table[gt].mode;
	rc = cpio_mkgeneric(name, mode, uid, gid);
	fail:
	return rc;
	}

	static int cpio_mkdir_line(const char *line)
	{
	return cpio_mkgeneric_line(line, GT_DIR);
	}

	static int cpio_mkpipe_line(const char *line)
	{
	return cpio_mkgeneric_line(line, GT_PIPE);
	}

	static int cpio_mksock_line(const char *line)
	{
	return cpio_mkgeneric_line(line, GT_SOCK);
	}

	static int cpio_mknod(const char *name, unsigned int mode,
	uid_t uid, gid_t gid, char dev_type,
	unsigned int maj, unsigned int min)
	{
	char s[256];
	time_t mtime = time(NULL);

	if (dev_type == 'b')
	mode \|= S_IFBLK;
	else
	mode \|= S_IFCHR;

	sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
	"%08X%08X%08X%08X%08X%08X%08X",
	"070701", /* magic */
	ino++, /* ino */
	mode, /* mode */
	(long) uid, /* uid */
	(long) gid, /* gid */
	1, /* nlink */
	(long) mtime, /* mtime */
	0, /* filesize */
	3, /* major */
	1, /* minor */
	maj, /* rmajor */
	min, /* rminor */
	(unsigned)strlen(name) + 1,/* namesize */
	0); /* chksum */
	push_hdr(s);
	push_rest(name);
	return 0;
	}

	static int cpio_mknod_line(const char *line)
	{
	char name[PATH_MAX + 1];
	unsigned int mode;
	int uid;
	int gid;
	char dev_type;
	unsigned int maj;
	unsigned int min;
	int rc = -1;

	if (7 != sscanf(line, "%" str(PATH_MAX) "s %o %d %d %c %u %u",
	name, &mode, &uid, &gid, &dev_type, &maj, &min)) {
	fprintf(stderr, "Unrecognized nod format '%s'", line);
	goto fail;
	}
	rc = cpio_mknod(name, mode, uid, gid, dev_type, maj, min);
	fail:
	return rc;
	}

	/* Not marked static to keep the compiler quiet, as no one uses this yet... */
	static int cpio_mkfile(const char name, const char location,
	unsigned int mode, uid_t uid, gid_t gid)
	{
	char s[256];
	char *filebuf = NULL;
	struct stat buf;
	int file = -1;
	int retval;
	int rc = -1;

	mode \|= S_IFREG;

	retval = stat (location, &buf);
	if (retval) {
	fprintf (stderr, "File %s could not be located\n", location);
	goto error;
	}

	file = open (location, O_RDONLY);
	if (file < 0) {
	fprintf (stderr, "File %s could not be opened for reading\n", location);
	goto error;
	}

	filebuf = malloc(buf.st_size);
	if (!filebuf) {
	fprintf (stderr, "out of memory\n");
	goto error;
	}

	retval = read (file, filebuf, buf.st_size);
	if (retval < 0) {
	fprintf (stderr, "Can not read %s file\n", location);
	goto error;
	}

	sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
	"%08X%08X%08X%08X%08X%08X%08X",
	"070701", /* magic */
	ino++, /* ino */
	mode, /* mode */
	(long) uid, /* uid */
	(long) gid, /* gid */
	1, /* nlink */
	(long) buf.st_mtime, /* mtime */
	(int) buf.st_size, /* filesize */
	3, /* major */
	1, /* minor */
	0, /* rmajor */
	0, /* rminor */
	(unsigned)strlen(name) + 1,/* namesize */
	0); /* chksum */
	push_hdr(s);
	push_string(name);
	push_pad();

	fwrite(filebuf, buf.st_size, 1, stdout);
	offset += buf.st_size;
	push_pad();
	rc = 0;

	error:
	if (filebuf) free(filebuf);
	if (file >= 0) close(file);
	return rc;
	}

	static int cpio_mkfile_line(const char *line)
	{
	char name[PATH_MAX + 1];
	char location[PATH_MAX + 1];
	unsigned int mode;
	int uid;
	int gid;
	int rc = -1;

	if (5 != sscanf(line, "%" str(PATH_MAX) "s %" str(PATH_MAX) "s %o %d %d", name, location, &mode, &uid, &gid)) {
	fprintf(stderr, "Unrecognized file format '%s'", line);
	goto fail;
	}
	rc = cpio_mkfile(name, location, mode, uid, gid);
	fail:
	return rc;
	}

	void usage(const char *prog)
	{
	fprintf(stderr, "Usage:\n"
	"\t%s <cpio_list>\n"
	"\n"
	"<cpio_list> is a file containing newline separated entries that\n"
	"describe the files to be included in the initramfs archive:\n"
	"\n"
	"# a comment\n"
	"file <name> <location> <mode> <uid> <gid>\n"
	"dir <name> <mode> <uid> <gid>\n"
	"nod <name> <mode> <uid> <gid> <dev_type> <maj> <min>\n"
	"slink <name> <target> <mode> <uid> <gid>\n"
	"pipe <name> <mode> <uid> <gid>\n"
	"sock <name> <mode> <uid> <gid>\n"
	"\n"
	"<name> name of the file/dir/nod/etc in the archive\n"
	"<location> location of the file in the current filesystem\n"
	"<target> link target\n"
	"<mode> mode/permissions of the file\n"
	"<uid> user id (0=root)\n"
	"<gid> group id (0=root)\n"
	"<dev_type> device type (b=block, c=character)\n"
	"<maj> major number of nod\n"
	"<min> minor number of nod\n"
	"\n"
	"example:\n"
	"# A simple initramfs\n"
	"dir /dev 0755 0 0\n"
	"nod /dev/console 0600 0 0 c 5 1\n"
	"dir /root 0700 0 0\n"
	"dir /sbin 0755 0 0\n"
	"file /sbin/kinit /usr/src/klibc/kinit/kinit 0755 0 0\n",
	prog);
	}

	struct file_handler file_handler_table[] = {
	{
	.type = "file",
	.handler = cpio_mkfile_line,
	}, {
	.type = "nod",
	.handler = cpio_mknod_line,
	}, {
	.type = "dir",
	.handler = cpio_mkdir_line,
	}, {
	.type = "slink",
	.handler = cpio_mkslink_line,
	}, {
	.type = "pipe",
	.handler = cpio_mkpipe_line,
	}, {
	.type = "sock",
	.handler = cpio_mksock_line,
	}, {
	.type = NULL,
	.handler = NULL,
	}
	};

	#define LINE_SIZE (2 * PATH_MAX + 50)

	int main (int argc, char *argv[])
	{
	FILE *cpio_list;
	char line[LINE_SIZE];
	char args, type;
	int ec = 0;
	int line_nr = 0;

	if (2 != argc) {
	usage(argv[0]);
	exit(1);
	}

	if (! (cpio_list = fopen(argv[1], "r"))) {
	fprintf(stderr, "ERROR: unable to open '%s': %s\n\n",
	argv[1], strerror(errno));
	usage(argv[0]);
	exit(1);
	}

	while (fgets(line, LINE_SIZE, cpio_list)) {
	int type_idx;
	size_t slen = strlen(line);

	line_nr++;

	if ('#' == *line) {
	/* comment - skip to next line */
	continue;
	}

	if (! (type = strtok(line, " \t"))) {
	fprintf(stderr,
	"ERROR: incorrect format, could not locate file type line %d: '%s'\n",
	line_nr, line);
	ec = -1;
	}

	if ('\n' == *type) {
	/* a blank line */
	continue;
	}

	if (slen == strlen(type)) {
	/* must be an empty line */
	continue;
	}

	if (! (args = strtok(NULL, "\n"))) {
	fprintf(stderr,
	"ERROR: incorrect format, newline required line %d: '%s'\n",
	line_nr, line);
	ec = -1;
	}

	for (type_idx = 0; file_handler_table[type_idx].type; type_idx++) {
	int rc;
	if (! strcmp(line, file_handler_table[type_idx].type)) {
	if ((rc = file_handler_table[type_idx].handler(args))) {
	ec = rc;
	fprintf(stderr, " line %d\n", line_nr);
	}
	break;
	}
	}

	if (NULL == file_handler_table[type_idx].type) {
	fprintf(stderr, "unknown file type line %d: '%s'\n",
	line_nr, line);
	}
	}
	cpio_trailer();

	exit(ec);
	}