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#include <u.h>
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#include <libc.h>
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static void
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usage(void)
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{
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	fprint(2, "usage: %s [-dR] [-p perm] [-P patternfile] [-e exportfs] srvname path\n", argv0);
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	exits("usage");
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}
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void
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main(int argc, char **argv)
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{
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	char *ename, *arglist[16], **argp;
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	int n, fd, pipefd[2];
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	char buf[64];
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	int perm = 0600;
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	argp = arglist;
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	ename = "/bin/exportfs";
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	*argp++ = "exportfs";
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	ARGBEGIN{
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	default:
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		usage();
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	case 'd':
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		*argp++ = "-d";
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		break;
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	case 'e':
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		ename = EARGF(usage());
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		break;
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	case 'p':
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		perm = strtol(EARGF(usage()), 0, 8);
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		break;
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	case 'P':
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		*argp++ = "-P";
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		*argp++ = EARGF(usage());
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		break;
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	case 'R':
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		*argp++ = "-R";
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		 break;
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	}ARGEND
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	*argp = 0;
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	if(argc != 2)
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		usage();
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	if(pipe(pipefd) < 0){
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		fprint(2, "can't pipe: %r\n");
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		exits("pipe");
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	}
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	switch(rfork(RFPROC|RFNOWAIT|RFNOTEG|RFFDG)){
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	case -1:
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		fprint(2, "can't rfork: %r\n");
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		exits("rfork");
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	case 0:
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		dup(pipefd[0], 0);
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		dup(pipefd[0], 1);
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		close(pipefd[0]);
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		close(pipefd[1]);
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		exec(ename, arglist);
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		fprint(2, "can't exec exportfs: %r\n");
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		exits("exec");
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	default:
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		break;
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	}
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	close(pipefd[0]);
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	if(fprint(pipefd[1], "%s", argv[1]) < 0){
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		fprint(2, "can't write pipe: %r\n");
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		exits("write");
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	}
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	n = read(pipefd[1], buf, sizeof buf-1);
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	if(n < 0){
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		fprint(2, "can't read pipe: %r\n");
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		exits("read");
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	}
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	buf[n] = 0;
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	if(n != 2 || strcmp(buf, "OK") != 0){
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		fprint(2, "not OK (%d): %s\n", n, buf);
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		exits("OK");
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	}
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	if(argv[0][0] == '/')
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		strecpy(buf, buf+sizeof buf, argv[0]);
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	else
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		snprint(buf, sizeof buf, "/srv/%s", argv[0]);
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	fd = create(buf, OWRITE, perm);
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	if(fd < 0){
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		fprint(2, "can't create %s: %r\n", buf);
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		exits("create");
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	}
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	fprint(fd, "%d", pipefd[1]);
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	close(fd);
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	close(pipefd[1]);
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	exits(0);
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}