Re: Suggestion for mkdir (original) (raw)

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From: Pádraig Brady
Subject: Re: Suggestion for mkdir
Date: Thu, 21 Nov 2013 09:39:14 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130110 Thunderbird/17.0.2

On 11/20/2013 09:51 PM, Renich Bon Ciric wrote:

Hello,

I'd like to suggest that:

mkdir -m 2771 -p /tmp/some/nonexistent/dir

sets 2751 to all created dirs; not just the last one.

Thank you and congratulations for the great work on coreutils!

This was previously discussed at: http://bugs.gnu.org/14249

So the control you have on the parent dir perms is a bit restricted (pardon the pun), and you can just clear bits (except for u=wx) with umask.

Wanting to setgid the whole hierarchy is valid, but mkdir couldn't do that without races anyway. You wouldn't really gain anything apart from convenience over doing:

mkdir -p /tmp/some chmod g+s /tmp/some mkdir -p /tmp/some/nonexistent/dir

The OS should without races propagate the setgid bit to new dirs below /tmp/some/

thanks, Pádraig.

p.s. there is a somewhat related discussion re perms of parent dirs and umask at: http://savannah.gnu.org/bugs/?19546