Re: Build for Alpine Linux

[Brian Hunt <brianmhunt@gmail.com>]

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Aditya: I did indeed; it fails with `mtxrun          | unknown script
'base.lua' or 'mtx-base.lua'` (sorry I didn't report this).

Hans:

> if musl needs different bin then there should be a different initial
> download i think because basically we're now talking of: windows, osx,
> linux, linuxmusl (a different species)

This appears to be the case currently, as first-setup.sh calls rsync to
copy files from:
http://standalone.contextgarden.net/setup/linuxmusl-64/bin/ for linux (musl)
http://standalone.contextgarden.net/setup/linux-64/bin/ for linux (glibc)

texlua just seems to be missing from the linuxmusl-64 path; it's in the
linux-64 path. I suspect it's a build issue.

> isn't there some magic env var that tels if musl is used? do programs
> and scripts really have to jumpo through such loops

It seems there is no better way to do detection. This post seems to
summarize what I'd read elsewhere:
https://unix.stackexchange.com/questions/120380

Could one symlink `texmf-linux-64` to point to `texmf-linuxmusl-64` via
first-setup.sh?  Then mtxrun wouldn't have to do any detection.

> hm, so musl is far from a drop=in for glib or do i get it wrong

There certainly do seem to be a lot of hoops.

That said, notwithstanding the weird path issues, of the six TODO items I
mentioned, 1 & 2, and 4 require musl detection, 3 is related to the rsync
setup, 5 is a shell problem (not musl per-se).

I've no idea what's going on with the paths / problem 6 though.  It could
be musl/luatex or maybe Alpine.  My most recent insight was that the
`instance.files` are essentially empty with Alpine/musl (and so is the
cache), so they're not being read for some reason.  I've not yet isolated
where that reading happens.

Brian

On Wed, 11 Apr 2018 at 16:37 Hans Hagen <j.hagen@xs4all.nl> wrote:

> On 4/11/2018 10:08 PM, Brian Hunt wrote:
> > So here's what I've got for a TODO so far to get ConTeXt working on
> > Alpine Linux with musl (subject to item #6, mtx-context.lua not being
> > found):
> >
> > 1. Add the musl test to first-setup.sh
> > 2. Add the same musl test to tex/setuptex
>
> no problem adding a robust test there
>
> > 3. Add texlua (and texluac?) to
> >    a. the setup rsync bin/ directories
> >    b. the tex/texmf-linuxmusl(|-ppc|-64)
>
> we don't use texluac, don't need texlua on windows and on linux texlua
> is just a symlink
>
> if musl needs different bin then there should be a different initial
> download i think because basically we're now talking of: windows, osx,
> linux, linuxmusl (a different species)
>
> > 4. Update mtxrun
> >
> > Here's code that ought to work for detecting musl in mtxrun.  Around
> > line 3721 of the mtxrun add:
> >
> >      if find(architecture,"x86_64",1,true) then
> >        platform="linux-64"
> >      elseif find(architecture,"ppc",1,true) then
> >        platform="linux-ppc"
> >      else
> >        platform="linux"
> >      end
> > +   if resultof("ldd --version 2>&1"):find("musl") ~= nil then
> > +     platform = platform:gsub("linux", "linuxmusl")
> > +   end
>
> that's not going to happen, some system call 9each run) in order to
> determine what linux species we run ... (there are a few calls but these
> are never used becasue we use HOSTTYPE (if needed we can set one
> ourselves on these platforms)
>
> isn't there some magic env var that tels if musl is used? do programs
> and scripts really have to jumpo through such loops
>
> > 5. Note that in tex/setuptex, there's evidently no way to get the
> > current script so one has to explicitly provide the TeX directory
> > (appears to be a BusyBox bug).
> > 6. `context` is unable to locate `mtx-context.lua`.  Some tracker output
> > sheds some light:
> >    i. context --trackers=resolvers.expansions is identical
> >    ii. context --trackers=resolvers.details,resolvers.details differs,
> > with the output attached.  Note that to keep the comparison short I
> > removed lines that differed only because `linux` had been changed to
> > `linuxmusl`.
> >
> > Will keep plugging away to see if I can determine why `mtx-context.lua`
> > cannot be found on Alpine Linux.
> hm, so musl is far from a drop=in for glib or do i get it wrong
>
> Hans
>
> -----------------------------------------------------------------
>                                            Hans Hagen | PRAGMA ADE
>                Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>         tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
> -----------------------------------------------------------------
>
-- 

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*Brian M Hunt *<brianmhunt@gmail.com>
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