[Slackbuilds-users] Virtualization and package building

[Andrzej Telszewski]

On 02/12/15 22:58, David Woodfall wrote:
>> On 02/12/15 21:04, David Woodfall wrote:
>>>> On 02/12/15 19:57, David Woodfall wrote:
>>>>>> Hi,
>>>>>>
>>>>>> I have to build packages for Slackware 14.0 and 14.1 as well as the
>>>>>> upcoming 14.2, for both 32-bit and 64-bit architecture and different
>>>>>> scenarios: server vs. desktop.
>>>>>>
>>>>>> Until april 2015 I built everything in a series of VirtualBox
>>>>>> guests on
>>>>>> my main workstation, which worked quite well most of the time. I
>>>>>> vaguely
>>>>>> remember having had trouble with one or two packages, but don't
>>>>>> recall
>>>>>> exactly which one.
>>>>>>
>>>>>> Since this date I've setup a dedicated package build host on a rather
>>>>>> modest hardware (AMD dual core processor, meh), and with a quite
>>>>>> bone-headed setup. No virtualization here, only a good old multiboot
>>>>>> with a hard disk partitioned to death: 15 partitions with a shared
>>>>>> swap
>>>>>> and a maximum of 14 different systems, currently 8 in use. I reckon
>>>>>> this
>>>>>> is a rather unusual way of doing things, but 1) KISS 2) works
>>>>>> perfectly.
>>>>>>
>>>>>> Last week I bought a thick book about Linux & Virtualization, and
>>>>>> before
>>>>>> diving head first into all this stuff, I have a general question
>>>>>> out of
>>>>>> curiosity. I guess most of you build your stuff in virtual guests
>>>>>> (correct me if I'm wrong). What kind of virtualization do you use for
>>>>>> this? KVM + qemu seems to be great for servers, but is it apt for
>>>>>> setting up a desktop stuff and building graphical applications
>>>>>> (Scribus,
>>>>>> VLC, whatever)?
>>>>>>
>>>>>> I think I'll read the book differently if I already have a vague
>>>>>> sense
>>>>>> of where I'm heading.
>>>>>>
>>>>>> Cheers,
>>>>>>
>>>>>> Niki
>>>>>
>>>>> I use chroots - a 64bit for pretty much everything, but I also have a
>>>>> 32bit chroot for building wine in. It's faster than booting a VM.
>>>>
>>>> Can you write a bit more on how you do this?
>>>> Or give an reference?
>>>
>>> I use this 'mkchroot' script, after mounting the Slackware DVD, to
>>> install into the chroot:
>>>
>>> ##########################################
>>> #!/bin/sh
>>>
>>> set -e
>>>
>>> SERIES="a ap d f k kde l n t tcl x xap y"
>>> CHPATH="/home/chroots/slackware64"
>>> CDPATH="/mnt/cdrom/slackware64"
>>> bgreen="^[[01;32m"
>>> normal="^[[0m"
>>>
>>> cd $CDPATH
>>>
>>> for i in $SERIES
>>> do
>>>    echo "${bgreen}Installing series $i${normal}"
>>>    upgradepkg --reinstall --install-new -root $CHPATH $i/*.t?z
>>> done
>>>
>>> mkdir -p $CHROOT/proc
>>> mkdir -p $CHROOT/dev
>>> mkdir -p $CHROOT/sys
>>> mkdir -p $CHROOT/tmp
>>> ##########################################
>>>
>>> I use this script 'cht' to use log in:
>>>
>>> ##########################################
>>> #!/bin/sh
>>>
>>> CHROOT=/home/chroots/slackware64
>>>
>>> if [ ! -r "$CHROOT" ]; then
>>>    exit 1
>>> fi
>>>
>>> # These are now mounted in /etc/fstab
>>> #mount -o bind /proc $CHROOT/proc
>>> #mount -o bind /dev $CHROOT/dev
>>> #mount -o bind /sys $CHROOT/sys
>>> #mount -o bind /tmp $CHROOT/tmp
>>>
>>> cp /etc/resolv.conf $CHROOT/etc
>>> cp /home/david/.Xauthority $CHROOT/root
>>>
>>> chroot $CHROOT /bin/zsh
>>> ##########################################
>>>
>>> My /etc/fstab entries:
>>>
>>> /proc  /home/chroots/slackware64/proc auto rw,bind,noatime 0 0
>>> /dev   /home/chroots/slackware64/dev auto rw,bind,noatime 0 0
>>> /sys   /home/chroots/slackware64/sys auto rw,bind,noatime 0 0
>>> /tmp   /home/chroots/slackware64/tmp auto rw,bind,noatime 0 0
>>>
>>> /tmp is shared between guest and host so I can move files/packages in
>>> and out easier.
>>>
>>> Hope this help.
>>
>> Yes, it helps a lot:)
>>
>> Bonus questions:
>> How do you do 32-bit chroot on 64-bit system?
>> Is it the same as for 64-bit one?
>> Are there any gotchas to be aware of?
>>
>> I hope I don't eat too much time of yours;)
>
> There is no real difference between the 32 and 64bit version. No
> patches that I'm aware of or have ever needed. I find it useful for
> building 32bit packages on a multilib host too.

Thank you for the info.
That sounds interesting.

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-- 
Pozdrawiam,
Best regards,
Andrzej Telszewski