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add an argument to cvs_chdir() which enables or not the removal
of the directory we just chdir'd to.
Useful when the function fails especially for the server mode and
its temporary directory. This way it's not left behind on exit.
ok joris@.

/*	$OpenBSD: server.c,v 1.26 2005/12/24 19:07:52 xsa Exp $	*/
/*
 * Copyright (c) 2004 Jean-Francois Brousseau <jfb@openbsd.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED ``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 AUTHOR 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 <sys/types.h>
#include <sys/stat.h>

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "cvs.h"
#include "log.h"
#include "proto.h"


/* argument vector built by the `Argument' and `Argumentx' requests */
char   **cvs_args;
u_int   cvs_nbarg = 0;
u_int   cvs_utf8ok = 0;
u_int   cvs_case = 0;

struct cvs_cmd cvs_cmd_server = {
	CVS_OP_SERVER, 0, "server",
	{ },
	"Server mode",
	"",
	"",
	NULL,
	0,
	NULL, NULL, NULL, NULL, NULL, NULL,
	0
};

char cvs_server_tmpdir[MAXPATHLEN];

/*
 * cvs_server()
 *
 * Implement the `cvs server' command.  As opposed to the general method of
 * CVS client/server implementation, the cvs program merely acts as a
 * redirector to the cvs daemon for most of the tasks.
 *
 * The `cvs server' command is only used on the server side of a remote
 * cvs command.  With this command, the cvs program starts listening on
 * standard input for CVS protocol requests.
 */
int
cvs_server(int argc, char **argv)
{
	int l, ret;
	size_t len;
	char reqbuf[512];

	if (argc != 1)
		return (CVS_EX_USAGE);

	/* make sure standard in and standard out are line-buffered */
	(void)setvbuf(stdin, NULL, _IOLBF, (size_t)0);
	(void)setvbuf(stdout, NULL, _IOLBF, (size_t)0);

	/* create the temporary directory */
	l = snprintf(cvs_server_tmpdir, sizeof(cvs_server_tmpdir),
	    "%s/cvs-serv%d", cvs_tmpdir, getpid());
	if (l == -1 || l >= (int)sizeof(cvs_server_tmpdir)) {
		errno = ENAMETOOLONG;
		fatal("cvs_server: tmpdir path too long: `%s'",
		    cvs_server_tmpdir);
	}

	if (mkdir(cvs_server_tmpdir, 0700) == -1)
		fatal("cvs_server: mkdir: `%s': %s",
		    cvs_server_tmpdir, strerror(errno));

	cvs_chdir(cvs_server_tmpdir, 1);

	for (;;) {
		if (fgets(reqbuf, (int)sizeof(reqbuf), stdin) == NULL) {
			if (feof(stdin))
				break;
			else if (ferror(stdin)) {
				(void)cvs_rmdir(cvs_server_tmpdir);
				fatal("cvs_server: fgets failed");
			}
		}

		len = strlen(reqbuf);
		if (len == 0)
			continue;
		else if (reqbuf[len - 1] != '\n') {
			(void)cvs_rmdir(cvs_server_tmpdir);
			fatal("cvs_server: truncated request");
		}
		reqbuf[--len] = '\0';

		cvs_req_handle(reqbuf);


	}

	/* cleanup the temporary tree */
	ret = cvs_rmdir(cvs_server_tmpdir);

	return (ret);
}