Re: Build for Alpine Linux

[Brian Hunt <brianmhunt@gmail.com>]

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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
3. Add texlua (and texluac?) to
  a. the setup rsync bin/ directories
  b. the tex/texmf-linuxmusl(|-ppc|-64)
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

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.

Thanks for reading.

Brian

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WORKING (Debian 8)
 # context --trackers=resolvers.details
resolvers       | resolving | file 'mtx-context.lua' is not readable
resolvers       | resolving | checking name 'mtx-context.lua'
resolvers       | resolving | deep checking 'selfautoparent:texmf-project', base 'mtx-context.lua', pattern 'false'
resolvers       | resolving | deep checking 'selfautoparent:texmf-fonts', base 'mtx-context.lua', pattern 'false'
resolvers       | resolving | deep checking 'selfautoparent:texmf-local', base 'mtx-context.lua', pattern 'false'
resolvers       | resolving | deep checking 'selfautoparent:texmf-modules', base 'mtx-context.lua', pattern 'false'
resolvers       | resolving | deep checking 'selfautoparent:texmf-context', base 'mtx-context.lua', pattern 'false'
resolvers       | methods | resolving, method 'concatinators', how 'tag', tag 'file'
resolvers       | resolving | match: variant 'file', search 'selfautoparent:texmf-context/scripts/context/lua/mtx-context.lua', result 'selfautoparent:texmf-context/scripts/context/lua/mtx-context.lua'
resolvers       | resolving | deep checking 'selfautoparent:texmf-linux-64', base 'mtx-context.lua', pattern 'false'
resolvers       | resolving | deep checking 'selfautoparent:texmf', base 'mtx-context.lua', pattern 'false'
resolvers       | resolving | checking filename 'mtx-context.lua' in tree
resolvers       | resolving | using pattern '^%./$' for path '.'
resolvers       | resolving | no match to '^%./$' in hash for file 'selfautoparent:texmf-context/scripts/context/lua/mtx-context.lua' and path 'selfautoparent:texmf-context/scripts/context/lua/'
resolvers       | resolving | quick root scan for '.'
resolvers       | resolving | file './mtx-context.lua' is not readable
resolvers       | resolving | using pattern '^home:texmf/tex/context/.*$' for path 'home:texmf/tex/context//'
…

NON-WORKING (Alpine 3.7)
 # context --trackers=resolvers.details
resolvers       | resolving | file 'mtx-context.lua' is not readable
resolvers       | resolving | checking name 'mtx-context.lua'
resolvers       | resolving | deep checking 'selfautoparent:texmf-project', base 'mtx-context.lua', pattern 'false'
resolvers       | resolving | deep checking 'selfautoparent:texmf-fonts', base 'mtx-context.lua', pattern 'false'
resolvers       | resolving | deep checking 'selfautoparent:texmf-local', base 'mtx-context.lua', pattern 'false'
resolvers       | resolving | deep checking 'selfautoparent:texmf-modules', base 'mtx-context.lua', pattern 'false'
resolvers       | resolving | deep checking 'selfautoparent:texmf-context', base 'mtx-context.lua', pattern 'false'
resolvers       | resolving | deep checking 'selfautoparent:texmf-linuxmusl-64', base 'mtx-context.lua', pattern 'false'
resolvers       | resolving | deep checking 'selfautoparent:texmf', base 'mtx-context.lua', pattern 'false'
resolvers       | resolving | checking filename 'mtx-context.lua' in tree
resolvers       | resolving | quick root scan for '.'
resolvers       | resolving | file './mtx-context.lua' is not readable
resolvers       | resolving | checking filename 'mtx-context.lua', filetype 'scripts', wanted files 'mtx-context.lua’.
…

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