From mboxrd@z Thu Jan  1 00:00:00 1970
From: arisawa <arisawa@ar.aichi-u.ac.jp>
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Message-Id: <73CCEA09-C492-439D-9E8A-AA2BA9CB93DB@ar.aichi-u.ac.jp>
Date: Thu, 17 Dec 2015 08:31:15 +0900
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Mime-Version: 1.0 (Mac OS X Mail 8.2 \(2104\))
Subject: [9fans] bug in exportfs
Topicbox-Message-UUID: 7a8fcbd4-ead9-11e9-9d60-3106f5b1d025


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/.*