[Buildroot] [PATCH 4/5] support/docker: add an Arch image

[Martin Bark]

Yann,

On 15 July 2018 at 20:45, Yann E. MORIN <yann.morin.1998 at free.fr> wrote:
> Martin, All,
>
> On 2018-07-15 20:30 +0100, Martin Bark spake thusly:
>> On 15 July 2018 at 10:05, Yann E. MORIN <yann.morin.1998 at free.fr> wrote:
> [--SNIP--]
>> > So, the reasoning is that, since we use a pinned version of the
>> > repository, running "pacman -Sy --noconfirm" will always yield the same
>> > state of the distribution.
>> >
>> > Now, it happens that we need to add a new package to the image, e.g. for
>> > local testing. We can thus re-use the intermediate, locally-cached image
>> > that has the local repository updated.
>> >
>> > It kinda speeds up things a bit.
>>
>> Yes where you have a pinned package repo i agree splitting the update
>> and install is ok.  So for debian and archlinux this is true but for
>> alpine you do need the update and install in one RUN
>
> Agreed on principle.
>
> However, I'd like we use the same constructs in all our dockerfiles, for
> consistency sake.
>
> And even if I did not expend too much time at making the Alpine image
> reproducible, I expect that we can ultimately make it so, if it is not
> already.
>
> In fact, I even expected people to show up and say "hey! what you did
> makes ofr a reproducible image," or "hey! here's how you can make it
> reproducible." ;-)
>

hey! here's how you can make it reproducible

1) build the alpine docker image.
2) mkdir -p support/docker/alpine_snapshot
3) docker run -it --rm -v
$PWD/support/docker/alpine_snapshot:/snapshot -u root
buildroot/alpine-3.7:$BR2_DOCKER_VERSION bash
4) inside the container run

mkdir -p /var/cache/apk
ln -s /var/cache/apk /etc/apk/cache
apk cache sync
cp -a /etc/apk/cache/*.apk /snapshot
exit

7) sudo chown -R $(id -u):$(id -g) support/docker/alpine_snapshot
6) edit the Dockerfile so it looks like this

COPY ./alpine_snapshot /snapshot
RUN apk add /snapshot/*.apk

7) build the alpine docker image again.  it will build using the apk
files from /snapshot directory we just created

This is not ideal but it's a proof of concept.  To improve you could
copy the apk to a website, setup it up as a proper signed package
repository and then edit /etc/apk/repositories to use this snapshot

Thanks

Martin


> Regards,
> Yann E. MORIN.
>
> [--SNIP--]
>> >> >> +        qemu \
>> >> >> +        qemu-arch-extra \
>> >> >
>> >> >If you change to using qemu-headless and qemu-headless-arch-extra
>> >> >packages it saves about 500MB on the image size
>> >
>> > Ah, that one is interesting to know! :-)
>> >
>> > However, are we sure that we don;t need the headed version of qemu?
>> >
>> > And why do we even have to have qemu in the image to start with, in the
>> > end?
>>
>> Good questions i don't know the answer to.  I assume it's something to
>> do with automated testing.
>>
>> Thanks
>>
>> Martin
>>
>> >
>> > Regards,
>> > Yann E. MORIN.
>> >
>> >> >Thanks
>> >> >
>> >> >Martin
>> >> >
>> >> >> +        rsync \
>> >> >> +        subversion \
>> >> >> +        unzip \
>> >> >> +        wget
>> >> >> +
>> >> >> +RUN sed -i 's/# *\(en_US.UTF-8\)/\1/' /etc/locale.gen \
>> >> >> +    && /usr/sbin/locale-gen
>> >> >> +
>> >> >> +RUN useradd -ms /bin/bash br-user
>> >> >> +
>> >> >> +USER br-user
>> >> >> +WORKDIR /home/br-user
>> >> >> +ENV HOME /home/br-user
>> >> >> +ENV LC_ALL en_US.UTF-8
>> >> >> --
>> >> >> 2.14.1
>> >> >>
>> >> >> _______________________________________________
>> >> >> buildroot mailing list
>> >> >> buildroot at busybox.net
>> >> >> http://lists.busybox.net/mailman/listinfo/buildroot
>> >>
>> >> Martin, All,
>> >> --
>> >> Sent from my phone. Please excuse my brevity.
>> >
>> > --
>> > .-----------------.--------------------.------------------.--------------------.
>> > |  Yann E. MORIN  | Real-Time Embedded | /"\ ASCII RIBBON | Erics' conspiracy: |
>> > | +33 662 376 056 | Software  Designer | \ / CAMPAIGN     |  ___               |
>> > | +33 223 225 172 `------------.-------:  X  AGAINST      |  \e/  There is no  |
>> > | http://ymorin.is-a-geek.org/ | _/*\_ | / \ HTML MAIL    |   v   conspiracy.  |
>> > '------------------------------^-------^------------------^--------------------'
>
> --
> .-----------------.--------------------.------------------.--------------------.
> |  Yann E. MORIN  | Real-Time Embedded | /"\ ASCII RIBBON | Erics' conspiracy: |
> | +33 662 376 056 | Software  Designer | \ / CAMPAIGN     |  ___               |
> | +33 223 225 172 `------------.-------:  X  AGAINST      |  \e/  There is no  |
> | http://ymorin.is-a-geek.org/ | _/*\_ | / \ HTML MAIL    |   v   conspiracy.  |
> '------------------------------^-------^------------------^--------------------'