Re: Build for Alpine Linux

[Brian Hunt <brianmhunt@gmail.com>]

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Here are a couple experimental observations.

1. Detecting musl.

-- Alpine Linux/sh --
$ ldd --version 2>&1 | grep -F musl
musl libc (x86_64)
$? = 0

-- Debian/bash --
$ ldd --version 2>&1 | grep -F musl
 (nothing; $? = 1)

-- Debian/zsh --
$ ldd --version 2>&1 | grep -F musl
(nothing; $? = 1)

A few notes:
a.) On some platforms fgrep has been deprecated (in favour of `grep -F`) so
it's not future-proof
b.) The caret (^) passed to `grep -F` will not be interpreted as a regex,
since -F forces non-regexp, meaning the '^' will be interpreted literally
(and the string "^musl" is not in the ldd output).
c.) It's likely safe to assume that the string 'musl' will only occur in
`ldd --version` where musl is installed
d.) I did not test a case Arthur described here
https://mailman.ntg.nl/pipermail/ntg-context/2018/091123.html, but the use
of -F ought to avoid the zsh EXTENDED_GLOB  problem

Based on this, a reasonably portable detection of musl in first-setup.sh
and tex/setuptex might be:

if command -v ldd >/dev/null && ldd --version 2>&1 | grep -Fq 'musl' >
/dev/null


2. Running /context/first-setup.sh the link /context/bin/texlua did not
exist and first-setup.sh fails.
Once symlinked to `luatex` in the same directory, first-setup.sh will run
rsync.

3. Similarly /context/tex/texmf-linuxmusl-64/bin/texlua does not exist, so
setuptex fails.
Once symlinked `luatex -> texlua` then setuptex can be executed (bearing in
mind `setuptex` needs to be updated with the same musl detection test as
first-setup.sh)

4. setuptex needs to be called with an explicit directory otherwise it
complains with

""/bin" is not a valid TEXROOT path.
(There is no file "/bin/texmf/tex/plain/base/plain.tex")
provide a proper tex root (like '. setuptex /something/tex')"

Running this will run setuptex variables:

$ . /context/tex/setuptex /context/tex
Setting "/context/tex" as ConTeXt root.

5. Running context exits with:
mtxrun          | unknown script 'context.lua' or 'mtx-context.lua'

That's as far as I have gotten for now, but I thought this enough to report.

6. I am happy to take direction and report, but it is also straightforward
to reproduce with Docker via the Dockerfile:

FROM python:3.6-alpine3.7
RUN apk --no-cache add rsyncWORKDIR /context

Then running docker:

$ docker build -t context .

$ docker run -ti context /bin/sh

Then in the docker container shell, run:

$ cd /context

$ wget http://minimals.contextgarden.net/setup/first-setup.sh \$ sh
./first-setup.sh --modules=all --engine=luatex

(please pardon the formatting - some copying and pasting here).

I hope this is helpful.

Cheers,
Brian


On Sun, 8 Apr 2018 at 20:52 Henri Menke <henrimenke@gmail.com> wrote:

> On Sun, 2018-04-08 at 22:50 +0200, Mojca Miklavec wrote:
> > Dear Brian,
> >
> > On 8 April 2018 at 16:56, Brian Hunt wrote:
> > >
> > > Hello everyone,
> > >
> > > Per this question on tex.StackOverflow, I am having trouble getting
> ConTeXt
> > > (LuaTeX specifically) to run on Alpine Linux:
> > >
> > > https://tex.stackexchange.com/questions/425463
> > >
> > > Specifically, the build from ConTeXt standalone has a LuaTeX that
> seems not
> > > to run against the musl libc6 library.
> > We have a "nearly working" one. At least all the binaries should be
> > there, see for example:
> >     http://distribution.contextgarden.net/setup/linuxmusl-64/
> >
> > There are two to three remaining problems:
> >
> > 1.) I disabled automatic musl recognition (short after enabling it)
> > after this bug report:
> >     https://mailman.ntg.nl/pipermail/ntg-context/2018/091094.html
> > I need to finish "parsing"
> >     https://mailman.ntg.nl/pipermail/ntg-context/2018/091123.html
> > and a few other posts in that thread and maybe make some additional
> > testing. There was some "oh no, it has to be the other way around"
> > discussion where I no longer followed and I need some more time to
> > read everything more carefully (no time for that right now).
> >
> > 2.) Most likely a patch in mtxrun is still needed (but I admit that I
> > didn't check) for proper platform recognition. The fact that we are
> > struggling in shell doesn't really help doing this part either :)
> >
> > 3.) Ideally we need to set up some automated LuaTeX builds to be able
> > to get the latest LuaTeX binaries in the future.
>
> Similar to TeX live I have set up an automated Travis CI build, which can
> deploy
> binaries to GitHub releases.
> https://github.com/hmenke/luatex/blob/master/.travis.yml
>
> However, I just forked Adam's mirror and I am not planning to keep mine
> updated.
> It would be nice to have some sort of “official” LuaTeX mirror on GitHub
> for
> that.  Nevertheless, it might be worthwhile to check the '.travis.yml' I
> posted
> above into the LuaTeX SVN.
>
> >
> > >
> > > Has anyone run ConTeXt on Alpine?
> > At the moment it should work if you install TeX Live 2018 pretest with
> > the ConTeXt scheme or if you fiddle a bit with the installation (you
> > need to hardcode the platform name in first-setup.sh and then still
> > some minor things might still go wrong, not sure). But in fact very
> > little is required to fix the remaining issues.
> >
> > Can you please remind us to pick this up again in a couple of days?
> >
> > In the meantime, if you are willing to do some more extensive testing
> > of patches (see full thread linked above) on both musl & non-musl
> > linuxes, in various shells etc., as well as perhaps come up with a
> > patch for mtxrun, that might help.
> >
> > Mojca
>
> ___________________________________________________________________________________
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>
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> ___________________________________________________________________________________

-- 

*from the personal account of:*

*Brian M Hunt *<brianmhunt@gmail.com>
Direct: +1-289-684-4677
LinkedIn: https://linkedin.com/in/brianmhunt

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If your question is of interest to others as well, please add an entry to the Wiki!

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