Re: bin/45430: ash uses argv[0] as $0 for scripts without #!

["Roland C. Dowdeswell" <elric%imrryr.org@localhost>]

The following reply was made to PR bin/45430; it has been noted by GNATS.

From: "Roland C. Dowdeswell" <elric%imrryr.org@localhost>
To: Nikolai Kondrashov <spbnick%gmail.com@localhost>
Cc: gnats-bugs%NetBSD.org@localhost, David Holland 
<dholland-bugs%netbsd.org@localhost>,
        gnats-admin%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost
Subject: Re: bin/45430: ash uses argv[0] as $0 for scripts without #!
Date: Mon, 7 Nov 2011 20:35:47 +0000

 On Mon, Nov 07, 2011 at 12:10:55AM +0200, Nikolai Kondrashov wrote:
 >
 
 > This is what happens on my Galaxy S II (it is only possible to execute using
 > busybox):
 > 
 > $ strings /system/bin/sh | grep NetBSD
 > $NetBSD: alias.c,v 1.12 2003/08/07 09:05:29 agc Exp $
 > $NetBSD: arith.y,v 1.17 2003/09/17 17:33:36 jmmv Exp $
 > $NetBSD: arith_lex.l,v 1.12.6.1 2005/04/07 11:38:58 tron Exp $
 > $NetBSD: cd.c,v 1.34 2003/11/14 20:00:28 dsl Exp $
 > $NetBSD: error.c,v 1.31 2003/08/07 09:05:30 agc Exp $
 > $NetBSD: eval.c,v 1.81.2.1 2005/06/13 22:03:51 tron Exp $
 > $NetBSD: exec.c,v 1.37 2003/08/07 09:05:31 agc Exp $
 > $NetBSD: expand.c,v 1.68.2.2 2005/04/07 11:37:39 tron Exp $
 > $NetBSD: input.c,v 1.39 2003/08/07 09:05:32 agc Exp $
 > $NetBSD: jobs.c,v 1.62 2003/12/18 00:56:05 christos Exp $
 > $NetBSD: main.c,v 1.48 2003/09/14 12:09:29 jmmv Exp $
 > $NetBSD: memalloc.c,v 1.28 2003/08/07 09:05:34 agc Exp $
 > $NetBSD: miscbltin.c,v 1.34.2.1 2005/04/07 11:34:20 tron Exp $
 > $NetBSD: mystring.c,v 1.16 2003/08/07 09:05:35 agc Exp $
 > $NetBSD: options.c,v 1.37 2004/10/30 19:29:27 christos Exp $
 > $NetBSD: parser.c,v 1.57 2004/06/27 10:27:57 dsl Exp $
 > $NetBSD: redir.c,v 1.29 2004/07/08 03:57:33 christos Exp $
 > $NetBSD: show.c,v 1.26 2003/11/14 10:46:13 dsl Exp $
 > $NetBSD: trap.c,v 1.31 2005/01/11 19:38:57 christos Exp $
 > $NetBSD: output.c,v 1.28 2003/08/07 09:05:36 agc Exp $
 > $NetBSD: var.c,v 1.36 2004/10/06 10:23:43 enami Exp $
 
 This is quite old but I can reproduce the issue with NetBSD's /bin/sh,
 but only if your script is executed by the shell rather than the kernel.
 I.e. if the shell script does not begin with #!/bin/sh.
 
 So:
 
 $ cat /tmp/foo
 echo "$0"
 $ /bin/sh -c 'PATH=/tmp foo'
 foo
 
 evidences the issue, whereas:
 
 $ cat /tmp/foo              
 #!/bin/sh
 
 echo "$0"
 $ /bin/sh -c 'PATH=/tmp foo'
 /tmp/foo
 
 does not.
 
 
 --
     Roland Dowdeswell                      http://Imrryr.ORG/~elric/