Re: [MirageOS-devel] Minimum requirements to run unix unikernel

[Gareth Rushgrove <gareth@xxxxxxxxxxxxxxxxx>]

On 9 June 2015 at 22:47, Justin Cormack <justin@xxxxxxxxxxxxxxxxxxxxx> wrote:
> On 9 June 2015 at 11:16, Justin Cormack <justin@xxxxxxxxxxxxxxxxxxxxx> wrote:
>> On 9 June 2015 at 09:28, Thomas Gazagnaire <thomas@xxxxxxxxxxxxxx> wrote:
>>>>> or just inside a scratch container and get the following error:
>>>>>
>>>>>    System error: no such file or directory
>>>>>
>>>>> So, questions:
>>>>>
>>>>> * Is the unix unikernel statically linked? ie. is the above ever going to 
>>>>> work?
>>>>> * What about the underlying OS needs to be the same?
>>>>> * Any debugging tips or ah ha observations?
>>>>
>>>> No, it is not statically linked. I am interested in fixing that...
>>>
>>> Maybe the 4.01.0+musl+static [1] switch could help? (need musl-gcc)
>>>
>>> ```
>>> opam switch 4.01.0+musl+static
>>> eval `opam config env`
>>> opam install mirage
>>> ...
>>> ```
>>>
>>> I never used that switch yet, but I believe it should works fine. Would be 
>>> interested to know if there also issues related to OCaml itself.
>>
>> No, it builds ocaml ok, but most of the mirage requirements wont
>> build, some because eg it can't find libev that works with Musl, some
>> things seem to want dynamic linking, some other less clear issues.
>>
>> Trying to build using the musl-gcc wrapper on a non Musl based distro
>> is probably not going to work as there is no nice way to eg build
>> libev against Musl. Fixing it to build ona  Musl distro and then
>> turning on static linking seems a better option.
>
> I made a native Musl OCaml build that you can use with
> docker run -i -t justincormack/alpine-pkgsrc-ocaml /bin/sh
>

Awesome, do publish how when you get a moment.

Cheers

Gareth

> Setting up a static build though,
>  - install   ipaddr.2.5.0
>  - install   lwt.2.4.5
>  - install   optcomp.1.6
> all fail to compile without dynamic libs, looking into this.
>
> Justin



-- 
Gareth Rushgrove
@garethr

devopsweekly.com
morethanseven.net
garethrushgrove.com

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