linux-kernel - Re: [PATCH 2/2 v3] initramfs: print error and shell out for unsupported content

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Message-ID: <533AFCC3.3030504@ahsoftware.de>
Date:	Tue, 01 Apr 2014 19:52:03 +0200
From:	Alexander Holler <holler@...oftware.de>
To:	Michal Marek <mmarek@...e.cz>, linux-kernel@...r.kernel.org
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Levente Kurusa <levex@...ux.com>, stable@...r.kernel.org
Subject: Re: [PATCH 2/2 v3] initramfs: print error and shell out for unsupported
 content

Am 01.04.2014 14:23, schrieb Michal Marek:
> On 2014-04-01 13:23, Alexander Holler wrote:
>> But as I already said, trying to use arbitrary filenames in a Makefile
>> doesn't really work. There are still other problems, e.g. filenames with
>> a / (directory separator), *, or some of the special make variables like $<.
>>
>> So the really working solution would be to get rid of that generated
>> (and hidden) include. Modifying gen_init_cpio.c to browse and collect
>> all filenames and types itself doesn't look like much work (an evening
>> should be enough).
>>
>> The drawback is that such a solution would build the initramfs every
>> time make is called (while CONFIG_INITRAMFS_SOURCE points to a
>> directory), but I think that time is negligible.
>
> Well, the cpio is embedded in the kernel image, so a rebuild of the cpio
> means a relink of the kernel. One option would be to implement the
> timestamp checking in gen_init_cpio.c, but I'm not sure if that's worth it.

I can't answer that too, but if someone spends the time implement the 
directory traversing and collecting stats, it would just be one stat 
more (to get the timestamp of an maybe already built cpio archive).

But I'm fine with just avoiding the most common problems (in my case 
colons and spaces). And the little patch which makes sure that make 
clean, distclean or mrproper will work always, avoids the need to search 
how to fix the problem (deleting that hidden include) once a broken 
include was generated.

Regards,

Alexander Holler

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