[linux.git] / usr / gen_init_cpio.c

#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
 * Hard link support by Luciano Rocha
 */

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

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

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];

	if (name[0] == '/')
		name++;
	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) default_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];

	if (name[0] == '/')
		name++;
	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) default_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];

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

	if (name[0] == '/')
		name++;
	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) default_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;
}

static int cpio_mkfile(const char *name, const char *location,
			unsigned int mode, uid_t uid, gid_t gid,
			unsigned int nlinks)
{
	char s[256];
	char *filebuf = NULL;
	struct stat buf;
	long size;
	int file = -1;
	int retval;
	int rc = -1;
	int namesize;
	int i;

	mode |= S_IFREG;

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

	retval = fstat(file, &buf);
	if (retval) {
		fprintf(stderr, "File %s could not be stat()'ed\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;
	}

	size = 0;
	for (i = 1; i <= nlinks; i++) {
		/* data goes on last link */
		if (i == nlinks) size = buf.st_size;

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

		if (size) {
			if (fwrite(filebuf, size, 1, stdout) != 1) {
				fprintf(stderr, "writing filebuf failed\n");
				goto error;
			}
			offset += size;
			push_pad();
		}

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

static char *cpio_replace_env(char *new_location)
{
       char expanded[PATH_MAX + 1];
       char env_var[PATH_MAX + 1];
       char *start;
       char *end;

       for (start = NULL; (start = strstr(new_location, "${")); ) {
               end = strchr(start, '}');
               if (start < end) {
                       *env_var = *expanded = '\0';
                       strncat(env_var, start + 2, end - start - 2);
                       strncat(expanded, new_location, start - new_location);
                       strncat(expanded, getenv(env_var), PATH_MAX);
                       strncat(expanded, end + 1, PATH_MAX);
                       strncpy(new_location, expanded, PATH_MAX);
               } else
                       break;
       }

       return new_location;
}


static int cpio_mkfile_line(const char *line)
{
	char name[PATH_MAX + 1];
	char *dname = NULL; /* malloc'ed buffer for hard links */
	char location[PATH_MAX + 1];
	unsigned int mode;
	int uid;
	int gid;
	int nlinks = 1;
	int end = 0, dname_len = 0;
	int rc = -1;

	if (5 > sscanf(line, "%" str(PATH_MAX) "s %" str(PATH_MAX)
				"s %o %d %d %n",
				name, location, &mode, &uid, &gid, &end)) {
		fprintf(stderr, "Unrecognized file format '%s'", line);
		goto fail;
	}
	if (end && isgraph(line[end])) {
		int len;
		int nend;

		dname = malloc(strlen(line));
		if (!dname) {
			fprintf (stderr, "out of memory (%d)\n", dname_len);
			goto fail;
		}

		dname_len = strlen(name) + 1;
		memcpy(dname, name, dname_len);

		do {
			nend = 0;
			if (sscanf(line + end, "%" str(PATH_MAX) "s %n",
					name, &nend) < 1)
				break;
			len = strlen(name) + 1;
			memcpy(dname + dname_len, name, len);
			dname_len += len;
			nlinks++;
			end += nend;
		} while (isgraph(line[end]));
	} else {
		dname = name;
	}
	rc = cpio_mkfile(dname, cpio_replace_env(location),
	                 mode, uid, gid, nlinks);
 fail:
	if (dname_len) free(dname);
	return rc;
}

static void usage(const char *prog)
{
	fprintf(stderr, "Usage:\n"
		"\t%s [-t <timestamp>] <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> [<hard links>]\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"
		"             expands shell variables quoted with ${}\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"
		"<hard links> space separated list of other links to file\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"
		"\n"
		"<timestamp> is time in seconds since Epoch that will be used\n"
		"as mtime for symlinks, special files and directories. The default\n"
		"is to use the current time for these entries.\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;
	const char *filename;

	default_mtime = time(NULL);
	while (1) {
		int opt = getopt(argc, argv, "t:h");
		char *invalid;

		if (opt == -1)
			break;
		switch (opt) {
		case 't':
			default_mtime = strtol(optarg, &invalid, 10);
			if (!*optarg || *invalid) {
				fprintf(stderr, "Invalid timestamp: %s\n",
						optarg);
				usage(argv[0]);
				exit(1);
			}
			break;
		case 'h':
		case '?':
			usage(argv[0]);
			exit(opt == 'h' ? 0 : 1);
		}
	}

	if (argc - optind != 1) {
		usage(argv[0]);
		exit(1);
	}
	filename = argv[optind];
	if (!strcmp(filename, "-"))
		cpio_list = stdin;
	else if (!(cpio_list = fopen(filename, "r"))) {
		fprintf(stderr, "ERROR: unable to open '%s': %s\n\n",
			filename, 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;
			break;
		}

		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);
		}
	}
	if (ec == 0)
		cpio_trailer();

	exit(ec);
}
Commit	Line	Data
1da177e4 LT	1	#include <stdio.h>
	2	#include <stdlib.h>
	3	#include <sys/types.h>
	4	#include <sys/stat.h>
	5	#include <string.h>
	6	#include <unistd.h>
	7	#include <time.h>
	8	#include <fcntl.h>
	9	#include <errno.h>
	10	#include <ctype.h>
	11	#include <limits.h>
	12
	13	/*
	14	* Original work by Jeff Garzik
	15	*
	16	* External file lists, symlink, pipe and fifo support by Thayne Harbaugh
24fa5096	17	* Hard link support by Luciano Rocha
1da177e4 LT	18	*/
	19
	20	#define xstr(s) #s
	21	#define str(s) xstr(s)
	22
	23	static unsigned int offset;
	24	static unsigned int ino = 721;
a8b8017c	25	static time_t default_mtime;
1da177e4 LT	26
	27	struct file_handler {
	28	const char *type;
	29	int (handler)(const char line);
	30	};
	31
	32	static void push_string(const char *name)
	33	{
	34	unsigned int name_len = strlen(name) + 1;
	35
	36	fputs(name, stdout);
	37	putchar(0);
	38	offset += name_len;
	39	}
	40
	41	static void push_pad (void)
	42	{
	43	while (offset & 3) {
	44	putchar(0);
	45	offset++;
	46	}
	47	}
	48
	49	static void push_rest(const char *name)
	50	{
	51	unsigned int name_len = strlen(name) + 1;
	52	unsigned int tmp_ofs;
	53
	54	fputs(name, stdout);
	55	putchar(0);
	56	offset += name_len;
	57
	58	tmp_ofs = name_len + 110;
	59	while (tmp_ofs & 3) {
	60	putchar(0);
	61	offset++;
	62	tmp_ofs++;
	63	}
	64	}
	65
	66	static void push_hdr(const char *s)
	67	{
	68	fputs(s, stdout);
	69	offset += 110;
	70	}
	71
	72	static void cpio_trailer(void)
	73	{
	74	char s[256];
	75	const char name[] = "TRAILER!!!";
	76
	77	sprintf(s, "%s%08X%08X%08lX%08lX%08X%08lX"
	78	"%08X%08X%08X%08X%08X%08X%08X",
	79	"070701", /* magic */
	80	0, /* ino */
	81	0, /* mode */
	82	(long) 0, /* uid */
	83	(long) 0, /* gid */
	84	1, /* nlink */
	85	(long) 0, /* mtime */
	86	0, /* filesize */
	87	0, /* major */
	88	0, /* minor */
	89	0, /* rmajor */
90	0, /* rminor */
91	(unsigned)strlen(name)+1, /* namesize */
92	0); /* chksum */
93	push_hdr(s);
94	push_rest(name);
95
96	while (offset % 512) {
97	putchar(0);
98	offset++;
99	}
100	}
101
102	static int cpio_mkslink(const char name, const char target,
103	unsigned int mode, uid_t uid, gid_t gid)
104	{
105	char s[256];
1da177e4	106
43f901fb TC	107	if (name[0] == '/')
43f901fb TC	108	name++;
1da177e4 LT	109	sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
	110	"%08X%08X%08X%08X%08X%08X%08X",
	111	"070701", /* magic */
	112	ino++, /* ino */
	113	S_IFLNK \| mode, /* mode */
	114	(long) uid, /* uid */
	115	(long) gid, /* gid */
	116	1, /* nlink */
a8b8017c	117	(long) default_mtime, /* mtime */
1da177e4 LT	118	(unsigned)strlen(target)+1, /* filesize */
	119	3, /* major */
	120	1, /* minor */
	121	0, /* rmajor */
	122	0, /* rminor */
	123	(unsigned)strlen(name) + 1,/* namesize */
	124	0); /* chksum */
	125	push_hdr(s);
	126	push_string(name);
	127	push_pad();
	128	push_string(target);
	129	push_pad();
	130	return 0;
	131	}
	132
	133	static int cpio_mkslink_line(const char *line)
	134	{
	135	char name[PATH_MAX + 1];
	136	char target[PATH_MAX + 1];
	137	unsigned int mode;
	138	int uid;
	139	int gid;
	140	int rc = -1;
	141
	142	if (5 != sscanf(line, "%" str(PATH_MAX) "s %" str(PATH_MAX) "s %o %d %d", name, target, &mode, &uid, &gid)) {
	143	fprintf(stderr, "Unrecognized dir format '%s'", line);
	144	goto fail;
	145	}
	146	rc = cpio_mkslink(name, target, mode, uid, gid);
	147	fail:
	148	return rc;
	149	}
	150
	151	static int cpio_mkgeneric(const char *name, unsigned int mode,
	152	uid_t uid, gid_t gid)
	153	{
	154	char s[256];
1da177e4	155
43f901fb TC	156	if (name[0] == '/')
43f901fb TC	157	name++;
1da177e4 LT	158	sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
	159	"%08X%08X%08X%08X%08X%08X%08X",
	160	"070701", /* magic */
	161	ino++, /* ino */
	162	mode, /* mode */
	163	(long) uid, /* uid */
	164	(long) gid, /* gid */
	165	2, /* nlink */
a8b8017c	166	(long) default_mtime, /* mtime */
1da177e4 LT	167	0, /* filesize */
	168	3, /* major */
	169	1, /* minor */
	170	0, /* rmajor */
	171	0, /* rminor */
	172	(unsigned)strlen(name) + 1,/* namesize */
	173	0); /* chksum */
	174	push_hdr(s);
	175	push_rest(name);
	176	return 0;
	177	}
	178
	179	enum generic_types {
	180	GT_DIR,
	181	GT_PIPE,
	182	GT_SOCK
	183	};
	184
	185	struct generic_type {
	186	const char *type;
	187	mode_t mode;
	188	};
	189
	190	static struct generic_type generic_type_table[] = {
	191	[GT_DIR] = {
	192	.type = "dir",
	193	.mode = S_IFDIR
	194	},
	195	[GT_PIPE] = {
	196	.type = "pipe",
	197	.mode = S_IFIFO
	198	},
	199	[GT_SOCK] = {
	200	.type = "sock",
	201	.mode = S_IFSOCK
	202	}
	203	};
	204
	205	static int cpio_mkgeneric_line(const char *line, enum generic_types gt)
	206	{
	207	char name[PATH_MAX + 1];
	208	unsigned int mode;
	209	int uid;
	210	int gid;
	211	int rc = -1;
	212
	213	if (4 != sscanf(line, "%" str(PATH_MAX) "s %o %d %d", name, &mode, &uid, &gid)) {
	214	fprintf(stderr, "Unrecognized %s format '%s'",
	215	line, generic_type_table[gt].type);
	216	goto fail;
	217	}
	218	mode \|= generic_type_table[gt].mode;
	219	rc = cpio_mkgeneric(name, mode, uid, gid);
	220	fail:
	221	return rc;
	222	}
	223
	224	static int cpio_mkdir_line(const char *line)
	225	{
	226	return cpio_mkgeneric_line(line, GT_DIR);
	227	}
	228
	229	static int cpio_mkpipe_line(const char *line)
	230	{
231	return cpio_mkgeneric_line(line, GT_PIPE);
232	}
233
234	static int cpio_mksock_line(const char *line)
235	{
236	return cpio_mkgeneric_line(line, GT_SOCK);
237	}
238
239	static int cpio_mknod(const char *name, unsigned int mode,
240	uid_t uid, gid_t gid, char dev_type,
241	unsigned int maj, unsigned int min)
242	{
243	char s[256];
1da177e4 LT	244
	245	if (dev_type == 'b')
	246	mode \|= S_IFBLK;
	247	else
	248	mode \|= S_IFCHR;
	249
43f901fb TC	250	if (name[0] == '/')
43f901fb TC	251	name++;
1da177e4 LT	252	sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
	253	"%08X%08X%08X%08X%08X%08X%08X",
	254	"070701", /* magic */
	255	ino++, /* ino */
	256	mode, /* mode */
	257	(long) uid, /* uid */
	258	(long) gid, /* gid */
	259	1, /* nlink */
a8b8017c	260	(long) default_mtime, /* mtime */
1da177e4 LT	261	0, /* filesize */
	262	3, /* major */
	263	1, /* minor */
	264	maj, /* rmajor */
	265	min, /* rminor */
	266	(unsigned)strlen(name) + 1,/* namesize */
	267	0); /* chksum */
	268	push_hdr(s);
	269	push_rest(name);
	270	return 0;
	271	}
	272
	273	static int cpio_mknod_line(const char *line)
	274	{
	275	char name[PATH_MAX + 1];
	276	unsigned int mode;
	277	int uid;
	278	int gid;
	279	char dev_type;
	280	unsigned int maj;
	281	unsigned int min;
	282	int rc = -1;
	283
	284	if (7 != sscanf(line, "%" str(PATH_MAX) "s %o %d %d %c %u %u",
	285	name, &mode, &uid, &gid, &dev_type, &maj, &min)) {
	286	fprintf(stderr, "Unrecognized nod format '%s'", line);
	287	goto fail;
	288	}
	289	rc = cpio_mknod(name, mode, uid, gid, dev_type, maj, min);
	290	fail:
	291	return rc;
	292	}
	293
1da177e4	294	static int cpio_mkfile(const char name, const char location,
24fa5096 LR	295	unsigned int mode, uid_t uid, gid_t gid,
24fa5096 LR	296	unsigned int nlinks)
1da177e4 LT	297	{
	298	char s[256];
	299	char *filebuf = NULL;
	300	struct stat buf;
24fa5096	301	long size;
1da177e4 LT	302	int file = -1;
	303	int retval;
	304	int rc = -1;
24fa5096 LR	305	int namesize;
24fa5096 LR	306	int i;
1da177e4 LT	307
	308	mode \|= S_IFREG;
	309
1da177e4 LT	310	file = open (location, O_RDONLY);
	311	if (file < 0) {
	312	fprintf (stderr, "File %s could not be opened for reading\n", location);
	313	goto error;
	314	}
	315
a3c888fc	316	retval = fstat(file, &buf);
96aebafa	317	if (retval) {
a3c888fc	318	fprintf(stderr, "File %s could not be stat()'ed\n", location);
96aebafa JJ	319	goto error;
	320	}
	321
1da177e4 LT	322	filebuf = malloc(buf.st_size);
	323	if (!filebuf) {
	324	fprintf (stderr, "out of memory\n");
	325	goto error;
	326	}
	327
	328	retval = read (file, filebuf, buf.st_size);
	329	if (retval < 0) {
	330	fprintf (stderr, "Can not read %s file\n", location);
	331	goto error;
	332	}
	333
24fa5096 LR	334	size = 0;
	335	for (i = 1; i <= nlinks; i++) {
	336	/* data goes on last link */
	337	if (i == nlinks) size = buf.st_size;
	338
43f901fb TC	339	if (name[0] == '/')
43f901fb TC	340	name++;
24fa5096 LR	341	namesize = strlen(name) + 1;
	342	sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
	343	"%08lX%08X%08X%08X%08X%08X%08X",
	344	"070701", /* magic */
	345	ino, /* ino */
	346	mode, /* mode */
	347	(long) uid, /* uid */
	348	(long) gid, /* gid */
	349	nlinks, /* nlink */
	350	(long) buf.st_mtime, /* mtime */
	351	size, /* filesize */
	352	3, /* major */
	353	1, /* minor */
	354	0, /* rmajor */
	355	0, /* rminor */
	356	namesize, /* namesize */
	357	0); /* chksum */
	358	push_hdr(s);
	359	push_string(name);
	360	push_pad();
	361
	362	if (size) {
6d87fea4 MF	363	if (fwrite(filebuf, size, 1, stdout) != 1) {
	364	fprintf(stderr, "writing filebuf failed\n");
	365	goto error;
	366	}
24fa5096 LR	367	offset += size;
	368	push_pad();
	369	}
	370
	371	name += namesize;
	372	}
	373	ino++;
1da177e4 LT	374	rc = 0;
	375
	376	error:
	377	if (filebuf) free(filebuf);
	378	if (file >= 0) close(file);
	379	return rc;
	380	}
	381
3b1ec9fb SG	382	static char cpio_replace_env(char new_location)
	383	{
	384	char expanded[PATH_MAX + 1];
	385	char env_var[PATH_MAX + 1];
	386	char *start;
	387	char *end;
	388
	389	for (start = NULL; (start = strstr(new_location, "${")); ) {
	390	end = strchr(start, '}');
	391	if (start < end) {
	392	env_var = expanded = '\0';
	393	strncat(env_var, start + 2, end - start - 2);
	394	strncat(expanded, new_location, start - new_location);
	395	strncat(expanded, getenv(env_var), PATH_MAX);
	396	strncat(expanded, end + 1, PATH_MAX);
	397	strncpy(new_location, expanded, PATH_MAX);
	398	} else
	399	break;
	400	}
	401
	402	return new_location;
	403	}
	404
	405
1da177e4 LT	406	static int cpio_mkfile_line(const char *line)
	407	{
	408	char name[PATH_MAX + 1];
24fa5096	409	char dname = NULL; / malloc'ed buffer for hard links */
1da177e4 LT	410	char location[PATH_MAX + 1];
	411	unsigned int mode;
	412	int uid;
	413	int gid;
24fa5096 LR	414	int nlinks = 1;
24fa5096 LR	415	int end = 0, dname_len = 0;
1da177e4 LT	416	int rc = -1;
1da177e4 LT	417
24fa5096 LR	418	if (5 > sscanf(line, "%" str(PATH_MAX) "s %" str(PATH_MAX)
	419	"s %o %d %d %n",
	420	name, location, &mode, &uid, &gid, &end)) {
1da177e4 LT	421	fprintf(stderr, "Unrecognized file format '%s'", line);
	422	goto fail;
	423	}
24fa5096 LR	424	if (end && isgraph(line[end])) {
	425	int len;
	426	int nend;
	427
	428	dname = malloc(strlen(line));
	429	if (!dname) {
	430	fprintf (stderr, "out of memory (%d)\n", dname_len);
	431	goto fail;
	432	}
	433
	434	dname_len = strlen(name) + 1;
	435	memcpy(dname, name, dname_len);
	436
	437	do {
	438	nend = 0;
	439	if (sscanf(line + end, "%" str(PATH_MAX) "s %n",
	440	name, &nend) < 1)
	441	break;
	442	len = strlen(name) + 1;
	443	memcpy(dname + dname_len, name, len);
	444	dname_len += len;
	445	nlinks++;
	446	end += nend;
	447	} while (isgraph(line[end]));
	448	} else {
	449	dname = name;
	450	}
3b1ec9fb SG	451	rc = cpio_mkfile(dname, cpio_replace_env(location),
3b1ec9fb SG	452	mode, uid, gid, nlinks);
1da177e4	453	fail:
24fa5096	454	if (dname_len) free(dname);
1da177e4 LT	455	return rc;
	456	}
	457
5c725138	458	static void usage(const char *prog)
1da177e4 LT	459	{
1da177e4 LT	460	fprintf(stderr, "Usage:\n"
a8b8017c	461	"\t%s [-t <timestamp>] <cpio_list>\n"
1da177e4 LT	462	"\n"
	463	"<cpio_list> is a file containing newline separated entries that\n"
	464	"describe the files to be included in the initramfs archive:\n"
	465	"\n"
	466	"# a comment\n"
24fa5096	467	"file <name> <location> <mode> <uid> <gid> [<hard links>]\n"
1da177e4 LT	468	"dir <name> <mode> <uid> <gid>\n"
	469	"nod <name> <mode> <uid> <gid> <dev_type> <maj> <min>\n"
	470	"slink <name> <target> <mode> <uid> <gid>\n"
	471	"pipe <name> <mode> <uid> <gid>\n"
	472	"sock <name> <mode> <uid> <gid>\n"
	473	"\n"
24fa5096 LR	474	"<name> name of the file/dir/nod/etc in the archive\n"
24fa5096 LR	475	"<location> location of the file in the current filesystem\n"
3b1ec9fb	476	" expands shell variables quoted with ${}\n"
24fa5096 LR	477	"<target> link target\n"
	478	"<mode> mode/permissions of the file\n"
	479	"<uid> user id (0=root)\n"
	480	"<gid> group id (0=root)\n"
	481	"<dev_type> device type (b=block, c=character)\n"
	482	"<maj> major number of nod\n"
	483	"<min> minor number of nod\n"
	484	"<hard links> space separated list of other links to file\n"
1da177e4 LT	485	"\n"
	486	"example:\n"
	487	"# A simple initramfs\n"
	488	"dir /dev 0755 0 0\n"
	489	"nod /dev/console 0600 0 0 c 5 1\n"
	490	"dir /root 0700 0 0\n"
	491	"dir /sbin 0755 0 0\n"
a8b8017c MM	492	"file /sbin/kinit /usr/src/klibc/kinit/kinit 0755 0 0\n"
	493	"\n"
	494	"<timestamp> is time in seconds since Epoch that will be used\n"
	495	"as mtime for symlinks, special files and directories. The default\n"
	496	"is to use the current time for these entries.\n",
1da177e4 LT	497	prog);
	498	}
	499
	500	struct file_handler file_handler_table[] = {
	501	{
	502	.type = "file",
	503	.handler = cpio_mkfile_line,
	504	}, {
	505	.type = "nod",
	506	.handler = cpio_mknod_line,
	507	}, {
	508	.type = "dir",
	509	.handler = cpio_mkdir_line,
	510	}, {
	511	.type = "slink",
	512	.handler = cpio_mkslink_line,
	513	}, {
	514	.type = "pipe",
	515	.handler = cpio_mkpipe_line,
	516	}, {
	517	.type = "sock",
	518	.handler = cpio_mksock_line,
	519	}, {
	520	.type = NULL,
	521	.handler = NULL,
	522	}
	523	};
	524
	525	#define LINE_SIZE (2 * PATH_MAX + 50)
	526
	527	int main (int argc, char *argv[])
	528	{
	529	FILE *cpio_list;
	530	char line[LINE_SIZE];
	531	char args, type;
	532	int ec = 0;
	533	int line_nr = 0;
a8b8017c MM	534	const char *filename;
	535
	536	default_mtime = time(NULL);
	537	while (1) {
	538	int opt = getopt(argc, argv, "t:h");
	539	char *invalid;
	540
	541	if (opt == -1)
	542	break;
	543	switch (opt) {
	544	case 't':
	545	default_mtime = strtol(optarg, &invalid, 10);
	546	if (!optarg \|\| invalid) {
	547	fprintf(stderr, "Invalid timestamp: %s\n",
	548	optarg);
	549	usage(argv[0]);
	550	exit(1);
	551	}
	552	break;
	553	case 'h':
	554	case '?':
	555	usage(argv[0]);
	556	exit(opt == 'h' ? 0 : 1);
	557	}
	558	}
1da177e4	559
a8b8017c	560	if (argc - optind != 1) {
1da177e4 LT	561	usage(argv[0]);
	562	exit(1);
	563	}
a8b8017c MM	564	filename = argv[optind];
a8b8017c MM	565	if (!strcmp(filename, "-"))
f2434ec1	566	cpio_list = stdin;
a8b8017c	567	else if (!(cpio_list = fopen(filename, "r"))) {
1da177e4	568	fprintf(stderr, "ERROR: unable to open '%s': %s\n\n",
a8b8017c	569	filename, strerror(errno));
1da177e4 LT	570	usage(argv[0]);
	571	exit(1);
	572	}
	573
	574	while (fgets(line, LINE_SIZE, cpio_list)) {
	575	int type_idx;
	576	size_t slen = strlen(line);
	577
	578	line_nr++;
	579
	580	if ('#' == *line) {
	581	/* comment - skip to next line */
	582	continue;
	583	}
	584
	585	if (! (type = strtok(line, " \t"))) {
	586	fprintf(stderr,
	587	"ERROR: incorrect format, could not locate file type line %d: '%s'\n",
	588	line_nr, line);
	589	ec = -1;
aa1e816f	590	break;
1da177e4 LT	591	}
	592
	593	if ('\n' == *type) {
	594	/* a blank line */
	595	continue;
	596	}
	597
	598	if (slen == strlen(type)) {
	599	/* must be an empty line */
	600	continue;
	601	}
	602
	603	if (! (args = strtok(NULL, "\n"))) {
	604	fprintf(stderr,
	605	"ERROR: incorrect format, newline required line %d: '%s'\n",
	606	line_nr, line);
	607	ec = -1;
	608	}
	609
	610	for (type_idx = 0; file_handler_table[type_idx].type; type_idx++) {
	611	int rc;
	612	if (! strcmp(line, file_handler_table[type_idx].type)) {
	613	if ((rc = file_handler_table[type_idx].handler(args))) {
	614	ec = rc;
	615	fprintf(stderr, " line %d\n", line_nr);
	616	}
	617	break;
	618	}
	619	}
	620
	621	if (NULL == file_handler_table[type_idx].type) {
	622	fprintf(stderr, "unknown file type line %d: '%s'\n",
	623	line_nr, line);
	624	}
	625	}
aa1e816f JJ	626	if (ec == 0)
aa1e816f JJ	627	cpio_trailer();
1da177e4 LT	628
	629	exit(ec);
	630	}