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devshr: honor noattach

--- a/sys/src/9/port/devshr.c

+++ b/sys/src/9/port/devshr.c

@@ -458,6 +458,8 @@

 		cclose(c);

 		return nc;	

 	case Qcroot:

+		if(up->pgrp->noattach)

+			error(Enoattach);

 		if((perm & DMDIR) == 0 || openmode(omode) != OREAD)

 			error(Eperm);

 		if(strlen(name) >= sizeof(up->genbuf))

@@ -490,6 +492,8 @@

 		sch->shr = shr;

 		break;

 	case Qcshr:

+		if(up->pgrp->noattach)

+			error(Enoattach);

 		if((perm & DMDIR) || openmode(omode) != OWRITE)

 			error(Eperm);

@@ -720,6 +724,8 @@

 		int	flags;

 	}bogus;

+	if(up->pgrp->noattach)

+		error(Enoattach);

 	sch = tosch(c);

 	if(sch->level != Qcmpt)

 		error(Egreg);