add --statefd option to lxc-checkpoint/restart

[mirror_lxc.git] / src / lxc / arguments.c

/*
 * lxc: linux Container library
 *
 * (C) Copyright IBM Corp. 2007, 2008
 *
 * Authors:
 * Daniel Lezcano <dlezcano at fr.ibm.com>
 * Michel Normand <normand at fr.ibm.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <string.h>
#include <ctype.h>		/* for isprint() */
#include <errno.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>

#include "arguments.h"

/*---------------------------------------------------------------------------*/
static int build_shortopts(const struct option *a_options,
			   char *a_shortopts, size_t a_size)
{
	const struct option *opt;
	int i = 0;

	if (!a_options || !a_shortopts || !a_size)
		return -1;

	for (opt = a_options; opt->name; opt++) {

		if (!isascii(opt->val))
			continue;

		if (i < a_size)
			a_shortopts[i++] = opt->val;
		else
			goto is2big;

		if (opt->has_arg == no_argument)
			continue;

		if (i < a_size)
			a_shortopts[i++] = ':';
		else
			goto is2big;

		if (opt->has_arg == required_argument)
			continue;

		if (i < a_size)
			a_shortopts[i++] = ':';
		else
			goto is2big;
	}

	if (i < a_size)
		a_shortopts[i] = '\0';
	else
		goto is2big;

	return 0;

      is2big:
	errno = E2BIG;
	return -1;
}

/*---------------------------------------------------------------------------*/
static void print_usage(const struct option longopts[],
			const struct lxc_arguments *a_args)

{
	int i;
	const struct option *opt;

	fprintf(stderr, "Usage: %s ", a_args->progname);

	for (opt = longopts, i = 1; opt->name; opt++, i++) {
		int j;
		char *uppername = strdup(opt->name);

		for (j = 0; uppername[j]; j++)
			uppername[j] = toupper(uppername[j]);

		fprintf(stderr, "[");

		if (isprint(opt->val))
			fprintf(stderr, "-%c|", opt->val);

		fprintf(stderr, "--%s", opt->name);

		if (opt->has_arg == required_argument)
			fprintf(stderr, "=%s", uppername);

		if (opt->has_arg == optional_argument)
			fprintf(stderr, "[=%s]", uppername);

		fprintf(stderr, "] ");

		if (!(i % 4))
			fprintf(stderr, "\n\t");

		free(uppername);
	}

	fprintf(stderr, "\n");
	exit(0);
}

static void print_help(const struct lxc_arguments *args, int code)
{
	fprintf(stderr, "\
Usage: %s %s\
\n\
Common options :\n\
  -o, --logfile=FILE               Output log to FILE instead of stderr\n\
  -l, --logpriority=LEVEL          Set log priority to LEVEL\n\
  -q, --quiet                      Don't produce any output\n\
  -?, --help                       Give this help list\n\
      --usage                      Give a short usage message\n\
\n\
Mandatory or optional arguments to long options are also mandatory or optional\n\
for any corresponding short options.\n\
\n\
See the %s man page for further information.\n\n",
	args->progname, args->help, args->progname);

	exit(code);
}

extern int lxc_arguments_parse(struct lxc_arguments *args,
			       int argc, char * const argv[])
{
	char shortopts[256];
	int  ret = 0;

	ret = build_shortopts(args->options, shortopts, sizeof(shortopts));
	if (ret < 0) {
		lxc_error(args, "build_shortopts() failed : %s",
			  strerror(errno));
		return ret;
	}

	while (1)  {
		int c, index = 0;

		c = getopt_long(argc, argv, shortopts, args->options, &index);
		if (c == -1)
			break;
		switch (c) {
		case 'n': 	args->name = optarg; break;
		case 'o':	args->log_file = optarg; break;
		case 'l':	args->log_priority = optarg; break;
		case 'q':	args->quiet = 1; break;
		case OPT_USAGE: print_usage(args->options, args);
		case '?':	print_help(args, 1);
		case 'h': 	print_help(args, 0);
		default:
			if (args->parser) {
				ret = args->parser(args, c, optarg);
				if (ret)
					goto error;
			}
		}
	}

	/*
	 * Reclaim the remaining command arguments
	 */
	args->argv = &argv[optind];
	args->argc = argc - optind;

	/* Check the command options */

	if (!args->name) {
		lxc_error(args, "missing container name, use --name option");
		return -1;
	}

	if (args->checker)
		ret = args->checker(args);
error:
	if (ret)
		lxc_error(args, "could not parse command line");
	return ret;
}

extern char **lxc_arguments_dup(const char *file, struct lxc_arguments *args)
{
	char **argv;
	int opt, nbargs = args->argc + 2;

	if (args->quiet)
		nbargs += 1;

	argv = malloc((nbargs + 1) * sizeof(*argv));
	if (!argv)
		return NULL;

	nbargs = 0;

	argv[nbargs++] = strdup(file);

	if (args->quiet)
		argv[nbargs++] = "--quiet";

	argv[nbargs++] = "--";

	for (opt = 0; opt < args->argc; opt++)
		argv[nbargs++] = strdup(args->argv[opt]);

	argv[nbargs] = NULL;

	return argv;
}