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Re: 1.8 and mkdir_p

From: Harlan Stenn
Subject: Re: 1.8 and mkdir_p
Date: Tue, 06 Jan 2004 21:51:43 -0800

Howdy Alexandre,

> Happy new year. 

Thanks, and same to you.

> >>> "Harlan" == Harlan Stenn <address@hidden> writes:
>  Harlan> This change:
>  Harlan> - Makefiles will prefer `mkdir -p' over mkinstalldirs if it is
>  Harlan> available.  This selection is achieved through the Makefile
>  Harlan> variable $(mkdir_p) that is set by AM_INIT_AUTOMAKE to either
>  Harlan> `mkdir -m 0755 -p --', `$(mkinstalldirs) -m 0755', or 
>  Harlan> `$(install_sh) -m 0755 -d'.
>  Harlan> sucks flaming red bugs.
> I did this because someone complained that if the installer had
> umask=077, the installation could create directories which were
> not world readable.

But what if that is what the installer intended?

> (Note that the patch in the follow-up is not what has been applied.)
> Since we are ignoring umask when installing files, it sounded
> correct to ignore it too when installing directories.

I kinda understand that.

How about we make a way for folks to specify/override the mode for directory
creation and "file" (script, bin, data, whatever) installation?

> Another point is that there are places in Automake where we have
> to use `install_sh' even if `install' exists, because `install'
> does not create leading directories by default and Automake
> cannot create mkdir calls for directories it does not know
> before hand (e.g., AC_SUBSTed nobase_ files).  `install_sh' is
> slow, and in the future we would like to use `install -D'
> instead when it is supported.  However `install -D' always
> creates 755 directories (it will preserve special bits like SGID
> though) and has no option to change that.

That will be Really Bad for us, as we go to great lengths to make sure we
create group-writable directories.

>  Harlan> How can one change the '-m 0755'?  I haven't found
>  Harlan> anything about this in the docs.
> perl -pi -e 's/-m 0755//g' configure

I made a local patch to the script that installs automake's macros that
pretty much does that...  We need this to be a "locally permanent" change
because we automate our checkouts and builds.

> sorry

I understand.

>  Harlan> I have a case where we want SGID and group-write.  In
>  Harlan> the "old days" this was easy - the previous case simply
>  Harlan> did whatever it did and we got SGID by default (because
>  Harlan> the parent directory was SGID) and our umask setting
>  Harlan> got us group-write.
> This looks like a legitimate setup to me.  More legitimate than
> umask=077 for installers, at least :)  Right now I think it's
> better to remove all these `-m 0755' from Automake.

That's what I did here...

> However, I'd really like to hear opinions about the related
> issues:
>  - is it normal to honor umask when creating directories and not 
>    when installing files?

I guess this depends on who you ask[1].

>  - should we just drop the `install -D' idea (because it creates
>    755 directories regardless of umask)?

That would be my vote.



[1] There are people who think a config.guess output that says:


is "normal", while some of us feel that is a particularly useless value and
would prefer to see something like:


instead, just like the original documentation spec'd out.

I have a script that does things like:

 rh> cvo
 rh> cvo I am a @cvo@ machine
 I am a i686-pc-redhat7.3 machine

 sb> cvo

which lets me do things like make sure I have a particular kernel OS version
on some platforms where that is appropriate.

But I've mentioned this before in other places...


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