vhd-util.c

xen source 推出最新的VHD操作工具VHD-UTIL 实现源码,超强

/* Copyright (c) 2008, XenSource Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of XenSource Inc. nor the names of its contributors
 *       may be used to endorse or promote products derived from this software
 *       without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "libvhd.h"
#include "vhd-util.h"

#if 1
#define DFPRINTF(_f, _a...) fprintf(stdout, _f , ##_a)
#else
#define DFPRINTF(_f, _a...) ((void)0)
#endif

typedef int (*vhd_util_func_t) (int, char **);

struct command {
	char               *name;
	vhd_util_func_t     func;
};

struct command commands[] = {
	{ .name = "create",      .func = vhd_util_create        },
	{ .name = "snapshot",    .func = vhd_util_snapshot      },
	{ .name = "query",       .func = vhd_util_query         },
	{ .name = "read",        .func = vhd_util_read          },
	{ .name = "set",         .func = vhd_util_set_field     },
	{ .name = "repair",      .func = vhd_util_repair        },
	{ .name = "resize",      .func = vhd_util_resize        },
	{ .name = "fill",        .func = vhd_util_fill          },
	{ .name = "coalesce",    .func = vhd_util_coalesce      },
	{ .name = "modify",      .func = vhd_util_modify        },
	{ .name = "scan",        .func = vhd_util_scan          },
	{ .name = "check",       .func = vhd_util_check         },
	{ .name = "revert",      .func = vhd_util_revert        },
};

#define print_commands()					\
	do {							\
		int i, n;					\
		n = sizeof(commands) / sizeof(struct command);	\
		printf("COMMAND := { ");			\
		printf("%s", commands[0].name);			\
		for (i = 1; i < n; i++)				\
			printf(" | %s", commands[i].name);	\
		printf(" }\n");					\
	} while (0)

TEST_FAIL_EXTERN_VARS;

void
help(void)
{
	printf("usage: vhd-util COMMAND [OPTIONS]\n");
	print_commands();
	exit(0);
}

struct command *
get_command(char *command)
{
	int i, n;

	if (strnlen(command, 25) >= 25)
		return NULL;

	n = sizeof(commands) / sizeof (struct command);

	for (i = 0; i < n; i++)
		if (!strcmp(command, commands[i].name))
			return &commands[i];

	return NULL;
}

int
main(int argc, char *argv[])
{
	char **cargv;
	struct command *cmd;
	int cargc, i, cnt, ret;

#ifdef CORE_DUMP
	#include <sys/resource.h>
	struct rlimit rlim;
	rlim.rlim_cur = RLIM_INFINITY;
	rlim.rlim_max = RLIM_INFINITY;
	if (setrlimit(RLIMIT_CORE, &rlim) < 0)
		fprintf(stderr, "setrlimit failed: %d\n", errno);
#endif

	ret = 0;

	if (argc < 2)
		help();

	cargc = argc - 1;
	cmd   = get_command(argv[1]);
	if (!cmd) {
		fprintf(stderr, "invalid COMMAND %s\n", argv[1]);
		help();
	}

	cargv = malloc(sizeof(char *) * cargc);
	if (!cargv)
		exit(ENOMEM);

	cnt      = 1;
	cargv[0] = cmd->name;
	for (i = 1; i < cargc; i++) {
		char *arg = argv[i + (argc - cargc)];

		if (!strcmp(arg, "--debug")) {
			libvhd_set_log_level(1);
			continue;
		}

		cargv[cnt++] = arg;
	}

#ifdef ENABLE_FAILURE_TESTING
	for (i = 0; i < NUM_FAIL_TESTS; i++) {
		TEST_FAIL[i] = 0;
		if (getenv(ENV_VAR_FAIL[i]))
			TEST_FAIL[i] = 1;
	}
#endif // ENABLE_FAILURE_TESTING

	ret = cmd->func(cnt, cargv);

	free(cargv);

	return (ret >= 0 ? ret : -ret);
}