Le 03/02/2017 à 12:38, Ian Campbell a écrit :
> On Fri, 2017-02-03 at 12:22 +0100, Emmanuel Kasper wrote:
>>>> A kernel boot param like net.ifnames=0 will be skipped when the
>>>> installer parses the boot option for setting the bootloader.
>>>>
>>>> Found in di-utils:
>>>>
>>>> # Skip module-specific variables
>>>> varnodot="${var##*.*}"
>>>> if [ "$varnodot" = "" ]; then
>>>> continue
>>>> fi
>>>>
>>>> So basically any option containing a dot is not propagated to the
>>>> installed system. This was introduced by
>>>> 7cf15980d714da8b958a73c93459ee09fdbb9415 ("Skip new module-
>>>> specific
>>>> parameters in user-params.")
>>>>
>>>> I found no documented or obvious reason for this behaviour.
>>>
>>> Sounds like the assumption was that any "foo.bar=baz" arguments
>>> were
>>> always to be used as the "bar=baz" option when loading the "foo"
>>> module
>>> (i.e. "modprobe foo bar=baz"), which I think the installer supports
>>> (for convenience) but perhaps not the installed system (where they
>>> should instead be in /etc/modules or /etc/modprobe.conf or similar)
>>> does not?
>>>
>>> which I think the installer supports
>>> (for convenience) but perhaps not the installed system (where they
>>> should instead be in /etc/modules or /etc/modprobe.conf or similar)
>>
>> Thanks for the analysys, it looks like a very much plausible rationale
>> behind this commit.
>>
>> If I understand you correctly, net.ifnames is understood as
>> a kernel module option, and modules options are not propagated to the
>> bootloader, because they "should" be configured in
>> /etc/modprobe.d/my_module.
>
> That's along the lines of what I think might be happening, yess
>
>> Actually I might be missing something, but if for instance I need a
>> kernel module option to make the installer boot on my hardware, like a
>> radeon.modeset=0, I probably need this on the installed system as well ?
>
> Correct, my (unchecked) assumption was that something in d-i would be
> doing so.
>
> You might find evidence of that in the fact that your net.ifnames=bar
> ended up under /etc/ somewhere, either in /etc/modprobe.d/* or
> /etc/modprobe.conf or /etc/modules.
>
good catch
virt-cat -a testing.build/testing.raw /etc/modprobe.d/local.conf
# Local module settings
# Created by the Debian installer
options net ifnames=0
