[9fans] bug in exportfs

[arisawa <arisawa@ar.aichi-u.ac.jp>]

Hello,

It seems cpu command is buggy in -P option.
the sources of the problem is in command option -P of exportfs.

I believe /sys/src/cmd/exportfs/pattern.c should be fixed as follows:

int
excludefile(char *path)
{
	Reprog **re;
	char *p;

	if(*(path+1) == 0)
		p = "/";
	else
		p = path+1;

	DEBUG(DFD, "checking %s\n", p);
	for(re = include; *re != nil; re++){
-		if(regexec(*re, p, nil, 0) != 1){
+		if(regexec(*re, p, nil, 0) == 1){
			DEBUG(DFD, "excluded+ %s\n", p);
-			return -1;
+			return 0;
		}
	}
	for(re = exclude; *re != nil; re++){
		if(regexec(*re, p, nil, 0) == 1){
			DEBUG(DFD, "excluded- %s\n", p);
			return -1;
		}
	}
	return 0;
}


patternfile sample
+ /usr/arisawa
+ /usr/glenda
- /adm
- /sys/log
- /mail
- /usr/.*