Date: Fri, 3 Jul 2009 13:36:10 -0500 From: Brooks Davis <brooks@FreeBSD.org> To: Tim Kientzle <kientzle@FreeBSD.org> Cc: svn-src-head@FreeBSD.org, svn-src-all@FreeBSD.org, src-committers@FreeBSD.org Subject: Re: svn commit: r195318 - head/usr.bin/cpio Message-ID: <20090703183609.GA45185@lor.one-eyed-alien.net> In-Reply-To: <200907031754.n63HsXRn084493@svn.freebsd.org> References: <200907031754.n63HsXRn084493@svn.freebsd.org>
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On Fri, Jul 03, 2009 at 05:54:33PM +0000, Tim Kientzle wrote:
> Modified: head/usr.bin/cpio/cmdline.c
> ==============================================================================
> --- head/usr.bin/cpio/cmdline.c Fri Jul 3 16:33:42 2009 (r195317)
> +++ head/usr.bin/cpio/cmdline.c Fri Jul 3 17:54:33 2009 (r195318)
> @@ -268,16 +268,36 @@ cpio_getopt(struct cpio *cpio)
> * Parse the argument to the -R or --owner flag.
> *
> * The format is one of the following:
> - * <user> - Override user but not group
> - * <user>: - Override both, group is user's default group
> - * <user>:<group> - Override both
> - * :<group> - Override group but not user
> + * <username|uid> - Override user but not group
> + * <username>: - Override both, group is user's default group
> + * <uid>: - Override user but not group
> + * <username|uid>:<groupname|gid> - Override both
> + * :<groupname|gid> - Override group but not user
> + *
> + * Where uid/gid are decimal representations and groupname/username
> + * are names to be looked up in system database. Note that
> + * uid/gid parsing takes priority over username/groupname lookup,
> + * so this won't do a lookup for usernames or group names that
> + * consist entirely of digits.
Is this behavior specified somewhere? It is counter to the usual rule
that the system should attempt to resolve all strings as a name first.
For example, the following is from the chown manpage in POSIX.1-2008
If a numeric owner operand exists in the user database as a user
name, the user ID number associated with that user name shall be
used as the user ID.
Numeric usernames are a disaster, especially if they can't match the uid
for some reason, but following this rule consistently at least makes
things more sane if you're stuck with them.
-- Brooks
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