Re: [MirageOS-devel] Hello World Missing Linker Script

["John P. McDermott (USN Civilian)" <john.mcdermott@xxxxxxxxxxxx>]

> On Jul 13, 2016, at 10:43 AM, Thomas Leonard <talex5@xxxxxxxxx> wrote:
> 
> On 13 July 2016 at 15:31, John P. McDermott (USN Civilian)
> <john.mcdermott@xxxxxxxxxxxx> wrote:
>> MirageOS Devs,
>> 
>> I am part of a project at NRL that researches security-focused derivatives 
>> of Xen. So we are interested in Mirage, for obvious reasons. I am trying to 
>> demonstrate to my management that Mirage will build and run on Ubuntu 14.04 
>> LTS. Switching to another distro is not an option. I am a complete OCaml 
>> noob.
>> 
>> To demonstrate Mirage running on 14.04, I am trying to make the Hello Word 
>> tutorial work. I have made it to the point where you run ‘make’ in 
>> mirage-skeleton/console. Make fails because it cannot find 
>> ~/.opam/4.02.1/lib/mirage-xen/mirage-x86_64.lds
>> 
>> I looked for this file on GitHub and could not find it.
>> 
>> My current OCaml install is by bootstrapping the latest ‘opam’, using
>> 
>>        wget https://raw.github.com/ocaml/opam/master/shell/opam_installer.sh 
>> -O - | sh -s /usr/local/bin
>> 
>> This gives me
>> 
>>        mc:~/mirage-skeleton/console$ opam --version
>>        1.2.2
>> 
>> and
>> 
>>        mc:~/mirage-skeleton/console$ ocaml -version
>>        The OCaml toplevel, version 4.02.1
>> 
>> which is good, but
>> 
>>        mc:~/mirage-skeleton/console$ mirage --version
>>        1.1.0
>> 
>> which is not good, according to the readme file inside mirage-skeleton. My 
>> attempts to get ‘opam’ to install a later version of Mirage have not 
>> succeeded.
> 
> Hi John,
> 
> This does look like the problem. First, ensure the aspcud package is
> installed. Without this, opam falls back to its internal solver which
> is often buggy. If that doesn't help, try forcing a recent version
> with:
> 
> $ opam update
> $ opam install mirage.2.9.0
> 
> That should at least tell you why it can't install that version.
> 
>> The Mirage skeleton is what I have from
>> 
>>        git clone git://github.com/mirage/mirage-skeleton.git
>> 
>> following the tutorial. I could checkout a detached head of this repo, if I 
>> knew the snapshot that is supposed to work with my version of Mirage.
>> 
>> Can anyone suggest a snapshot for mirage-skeleton that would work with 
>> earlier versions of Mirage? Alternatively, is there somewhere other than 
>> GitHub that has the missing linker script?
>> 
>> Sincerely,
>> 
>> John
>> 
>> 
>> 
>> _______________________________________________
>> MirageOS-devel mailing list
>> MirageOS-devel@xxxxxxxxxxxxxxxxxxxx
>> https://lists.xenproject.org/cgi-bin/mailman/listinfo/mirageos-devel
> 
> 
> 
> -- 
> talex5 (GitHub/Twitter)        http://roscidus.com/blog/
> GPG: 5DD5 8D70 899C 454A 966D  6A51 7513 3C8F 94F6 E0CC
> GPG: DA98 25AE CAD0 8975 7CDA  BD8E 0713 3F96 CA74 D8BA

SOLVED. Thank you, Thomas.

I already had

        root# apt-cache policy aspcud
        aspcud:
        Installed: 1:1.8.0-2
        Candidate: 1:1.8.0-2

so that was good. I could not install 2.9.0 with ‘opam', but I tried 2.7.0, as 
per the skeleton’s readme file, and that installs on 14.04.

When I ran

        mc@xenpro7:~/mirage-skeleton/console$ mirage configure —xen

next, it downgraded mirage. So I reinstalled mirage.2.7.0 but then ran eval 
`opam config env`. (I am learning.) Doing it this way, configure works as 
desired, ‘make' builds the guest image and the guest image runs perfectly. So 
this thread has a recipe for getting the current skeleton to build Hello World 
on Ubuntu 14.04.

Sincerely,

John




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