make /var/lib/dpkg a ramdisk :(

[Juergen Kahnert]

Hi,

On Sun, May 23, 2010 at 03:22:16AM +0200, Michael Prokop wrote:
> * Thomas Lange <lange at informatik.uni-koeln.de> [Wed May 19, 2010 at 03:17:42AM +0200]:
> 
>>> Not every device being installed with FAI has so much memory...
>> You can write a hook and redefine mkramdisk as a noop subroutine.
> 
> Since FAI 3.3.4 setting FAI_NORAMDISK=1 is supported to skip the
> mkramdisk feature.

what about to add a check in mkramdisk to skip it automatically if there
is not enough memory on the system?

Something like this:

    typeset -i memtotal=$(sed -ne 's/^MemTotal:[[:space:]]*\([0-9]*\)[[:space:]]*.*/\1/p' /proc/meminfo)
    [ ${memtotal} -lt 1000000 ] && return


>> A future version of FAI will have a variable, which holds a list
>> of all directories that will be put into a ramdisk. If this list
>> is empty, no ramdisk will be created. But it's not yet
>> implemented.

It's not about the way to disable the ramdisk feature. It's always
possible to fix it and make it work on low mem systems, either with a
hook, via FAI_NORAMDISK=1, a list of ramdisk directories or whatever.

It's about to make it work without spending time of investigation, why
the default don't work on some systems...

Regards

    Jürgen Kahnert


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