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hgfs: detect fncache repo format

--- a/sys/src/cmd/hgfs/fs.c

+++ b/sys/src/cmd/hgfs/fs.c

@@ -45,6 +45,7 @@

 static Revlog *revlogs;

 static char dothg[MAXPATH];

+static int mangle = 0;

 static Revlog*

 getrevlog(Revnode *nd)

@@ -51,9 +52,12 @@

 {

 	char buf[MAXPATH];

 	Revlog *rl;

+	int mang;

+	mang = mangle;

+Again:

 	nodepath(seprint(buf, buf+sizeof(buf), "%s/store/data", dothg),

-		buf+sizeof(buf), nd, 1);

+		buf+sizeof(buf), nd, mang);

 	for(rl = revlogs; rl; rl = rl->next)

 		if(strcmp(buf, rl->path) == 0)

 			break;

@@ -62,10 +66,14 @@

 		memset(rl, 0, sizeof(*rl));

 		if(revlogopen(rl, buf, OREAD) < 0){

 			free(rl);

+			if(mang++ == 0)

+				goto Again;

 			return nil;

 		}

 		rl->next = revlogs;

 		revlogs = rl;

+		if(mang)

+			mangle = 1;

 	} else

 		revlogupdate(rl);

 	incref(rl);

-- 

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