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hjfs: fix group ownership of home dirs created by newuser command

--- a/sys/src/cmd/hjfs/auth.c

+++ b/sys/src/cmd/hjfs/auth.c

@@ -366,13 +366,18 @@

 createuserdir(Fs *fs, char *name, short uid)

 {

 	Chan *ch;

+	Dir di;

 	ch = chanattach(fs, CHFNOPERM);

 	if(ch == nil)

 		return;

 	ch->uid = uid;

-	if(chanwalk(ch, "usr") > 0)

+	if(chanwalk(ch, "usr") > 0){

 		chancreat(ch, name, DMDIR | 0775, OREAD);

+		nulldir(&di);

+		di.gid = name;

+		chanwstat(ch, &di);

+	}

 	chanclunk(ch);

 }