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Subject: Re: git: f555b39e6bb7 - main - man: reset OPTIND before parsing args
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To: Kyle Evans <kevans@FreeBSD.org>, src-committers@FreeBSD.org,
 dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org
References: <202109231914.18NJELZU023086@gitrepo.freebsd.org>
From: Bryan Drewery <bdrewery@FreeBSD.org>
Organization: FreeBSD
Message-ID: <33438d0b-1925-8d44-83bb-62054b141635@FreeBSD.org>
Date: Thu, 23 Sep 2021 13:06:12 -0700
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From: Bryan Drewery <bdrewery@FreeBSD.org>
To: Kyle Evans <kevans@FreeBSD.org>, src-committers@FreeBSD.org,
 dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org
Message-ID: <33438d0b-1925-8d44-83bb-62054b141635@FreeBSD.org>
Subject: Re: git: f555b39e6bb7 - main - man: reset OPTIND before parsing args
References: <202109231914.18NJELZU023086@gitrepo.freebsd.org>
In-Reply-To: <202109231914.18NJELZU023086@gitrepo.freebsd.org>

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On 9/23/2021 12:14 PM, Kyle Evans wrote:
> The branch main has been updated by kevans:
>=20
> URL: https://cgit.FreeBSD.org/src/commit/?id=3Df555b39e6bb7cbfbe1905e90=
f64c4dfc4456fabb
>=20
> commit f555b39e6bb7cbfbe1905e90f64c4dfc4456fabb
> Author:     Kyle Evans <kevans@FreeBSD.org>
> AuthorDate: 2021-09-22 19:58:19 +0000
> Commit:     Kyle Evans <kevans@FreeBSD.org>
> CommitDate: 2021-09-23 19:13:34 +0000
>=20
>     man: reset OPTIND before parsing args
>    =20
>     From jilles: POSIX requires that a script set `OPTIND=3D1` before u=
sing
>     different sets of parameters with `getopts`, or the results will be=

>     unspecified.
>    =20
>     The specific problem observed here is that we would execute `man -f=
` or
>     `man -k` without cleaning up state from man_parse_args()' `getopts`=

>     loop.  FreeBSD's /bin/sh seems to reset OPTIND to 1 after we hit th=
e
>     second getopts loop, rendering the following shift harmless; other
>     /bin/sh implementations will leave it at what we came into the loop=
 at
>     (e.g., bash as /bin/sh), shifting off any keywords that we had.
>    =20
>     Input from:     jilles
>     Reviewed by:    allanjude, bapt, imp
>     Sponsored by:   Klara, Inc.
>     Differential Revision:  https://reviews.freebsd.org/D32063
> ---
>  usr.bin/man/man.sh | 4 ++++
>  1 file changed, 4 insertions(+)
>=20
> diff --git a/usr.bin/man/man.sh b/usr.bin/man/man.sh
> index f31c464fcc8f..084f4a06829b 100755
> --- a/usr.bin/man/man.sh
> +++ b/usr.bin/man/man.sh
> @@ -243,6 +243,7 @@ is_newer() {
>  manpath_parse_args() {
>  	local cmd_arg
> =20
> +	OPTIND=3D1
>  	while getopts 'Ldq' cmd_arg; do
>  		case "${cmd_arg}" in
>  		L)	Lflag=3DLflag ;;

Not that it matters much but since this script makes use of 'local',
OPTIND and OPTARG might as well be in the list as well.

--=20
Bryan Drewery


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