Set luatex cache directory path

Set luatex cache directory path

[Thangalin]

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Peter Münster once asked:

> What should I do please, to prevent ConTeXt from creating
$HOME/luatex-cache?

I'd like to do the same:

$ cd $HOME
$ ls luatex-cache
ls: cannot access 'luatex-cache': No such file or directory
$ context test.tex
$ ls luatex-cache/
context
$ rm -rf luatex-cache
$ export TEXMFCACHE=/tmp
$ context test.tex
mtxrun          | unknown script 'mtx-context.lua' or 'mtx-mtx-context.lua'
$ export TEXMFCACHE=
$ context --version
...
mtx-context     | current version: 2021.03.31 18:04

What environment variable must change to set the luatex-cache directory?

Thank you!

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Re: Set luatex cache directory path

[Aditya Mahajan]

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On Mon, 5 Apr 2021, Thangalin wrote:

> Peter Münster once asked:
> 
> > What should I do please, to prevent ConTeXt from creating
> $HOME/luatex-cache?
> 
> I'd like to do the same:
> 
> $ cd $HOME
> $ ls luatex-cache
> ls: cannot access 'luatex-cache': No such file or directory
> $ context test.tex
> $ ls luatex-cache/
> context
> $ rm -rf luatex-cache
> $ export TEXMFCACHE=/tmp

Add

$ mtxrun --generate

> $ context test.tex
> mtxrun          | unknown script 'mtx-context.lua' or 'mtx-mtx-context.lua'
> $ export TEXMFCACHE=
> $ context --version
> ...
> mtx-context     | current version: 2021.03.31 18:04
> 
> What environment variable must change to set the luatex-cache directory?

Aditya

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Re: Set luatex cache directory path

[Thangalin]

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Thanks Aditya.

What do you think of changing the default luatex-cache directory to the
system's temporary directory? Consider:

   - The $HOME directory is sacrosanct (4784 people agree:
   https://bugs.launchpad.net/ubuntu/+source/snapd/+bug/1575053)
   - The temp directory is cleared on Linux (Unix?) system reboots; purged
   during regular Windows upkeep
   - The temp directory is writable by default
   - Changing the location requires calling an additional program, which
   isn't obvious (principle of least astonishment)

My text editor invokes ConTeXt like:

    if( TYPESETTER.canRun() ) {
      env.put( "TEXMFCACHE", System.getProperty( "java.io.tmpdir" ) );

      mArgs.add( TYPESETTER.getName() );
      mArgs.add( .. --path .. --purge .. --batch .. --result ..
--environment .. etc. );
      mArgs.add( inputFilename );
    }

The first line ensures that "context" is an executable located in a PATH
directory. The second line attempts to change the luatex-cache directory.
The remaining lines configure the command-line arguments prior to running
ConTeXt.

Fearing flaming wrath from users, an additional mtxrun call is required,
which incurs overhead:

   - Check for mtxrun executable
   - Run mtxrun each time

This would work but feels like a leaky abstraction (i.e., the context
executable should honour TEXMFCACHE without needing to invoke mtxrun
because context creates the luatex-cache directory).

Thoughts?

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Re: Set luatex cache directory path

[Aditya Mahajan]

On Tue, 6 Apr 2021, Thangalin wrote:

> Thanks Aditya.
> 
> What do you think of changing the default luatex-cache directory to the
> system's temporary directory? Consider:
> 
>    - The $HOME directory is sacrosanct (4784 people agree:
>    https://bugs.launchpad.net/ubuntu/+source/snapd/+bug/1575053)
>    - The temp directory is cleared on Linux (Unix?) system reboots; purged
>    during regular Windows upkeep
>    - The temp directory is writable by default
>    - Changing the location requires calling an additional program, which
>    isn't obvious (principle of least astonishment)

Use:

mtxrun --autogenerate --script mtx-context ...

Aditya
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Re: Set luatex cache directory path

[Thangalin]

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Perfect, thank you.

Will be Wikified.

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Re: Set luatex cache directory path

[Hans Hagen]

On 4/6/2021 8:59 PM, Thangalin wrote:
> Thanks Aditya.
> 
> What do you think of changing the default luatex-cache directory to the 
> system's temporary directory? Consider:
> 
>   * The $HOME directory is sacrosanct (4784 people agree:
>     https://bugs.launchpad.net/ubuntu/+source/snapd/+bug/1575053
>     <https://bugs.launchpad.net/ubuntu/+source/snapd/+bug/1575053>)
>   * The temp directory is cleared on Linux (Unix?) system reboots;
>     purged during regular Windows upkeep
>   * The temp directory is writable by default
>   * Changing the location requires calling an additional program, which
>     isn't obvious (principle of least astonishment)

Do you really want to recahe fonts so often?

> My text editor invokes ConTeXt like:
> 
>      if( TYPESETTER.canRun() ) {
>        env.put( "TEXMFCACHE", System.getProperty( "java.io.tmpdir" ) );
> 
>        mArgs.add( TYPESETTER.getName() );
>        mArgs.add( .. --path .. --purge .. --batch .. --result .. 
> --environment .. etc. );
>        mArgs.add( inputFilename );
>      }

--batch only makes sense for an unattended run
--purging every time can lead to extra runs

> The first line ensures that "context" is an executable located in a PATH 
> directory. The second line attempts to change the luatex-cache 
> directory. The remaining lines configure the command-line arguments 
> prior to running ConTeXt.
> 
> Fearing flaming wrath from users, an additional mtxrun call is required, 
> which incurs overhead:
> 
>   * Check for mtxrun executable
>   * Run mtxrun each time

see aditya's reply ... the --autogenerate is clever enough not to do 
redundant things (and context knows when it has been updated so ...)

> This would work but feels like a leaky abstraction (i.e., the context 
> executable should honour TEXMFCACHE without needing to invoke mtxrun 
> because context creates the luatex-cache directory).
see aditya's reply ... quite some effort has gone into making sure 
context starts up fast so i'm not going to advocate a different practice

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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___________________________________________________________________________________

Re: Set luatex cache directory path

[Thangalin]

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Are two runs always required to generate a PDF when TEXMFCACHE is set?

$ sudo su -
$ mkdir -p /opt/context
$ cd /opt/context
$ wget http://lmtx.pragma-ade.nl/install-lmtx/context-linux-64.zip
$ unzip *zip
$ sh install.sh
$ exit
$ cat test.tex
\starttext
Test
\stoptext
$ export TEXMFCACHE=/tmp
$ rm -rf $TEXMFCACHE/luatex-cache
$ /opt/context/tex/texmf-linux-64/bin/mtxrun --autogenerate --script
mtx-context --autopdf test.tex
...
resolvers       | resolving | remembered file 'mtx-context.lua'
resolvers       | resolving | remembered file 'mtx-contexts.lua'
resolvers       | resolving | remembered file 'mtx-context.lua'
resolvers       | resolving | remembered file 'mtx-t-mtx-context.lua'
resolvers       | resolving | remembered file 'mtx-t-mtx-contexts.lua'
resolvers       | resolving | remembered file 'mtx-t-mtx-context.lua'
resolvers       | resolving | remembered file 'mtx-context.lua'
mtxrun          | unknown script 'mtx-context.lua' or 'mtx-mtx-context.lua'
$ /opt/context/tex/texmf-linux-64/bin/mtxrun --script context --version
mtx-context     | current version: 2021.04.10 17:09
$ mtxrun --autogenerate --script mtx-context --autopdf test.tex
...
mkiv lua stats  > runtime: 0.432 seconds, 1 processed pages, 1 shipped
pages, 2.315 pages/second
system          | total runtime: 3.318 seconds of 3.372 seconds

The first run fails; the second run succeeds.

If TEXMFCACHE is not set, then the first run succeeds. If TEXMFCACHE is set
to any non-empty value and $TEXMFCACHE/luatex-cache has not been created,
mtxrun always terminates with the same unknown script error.

What am I missing to ensure that ConTeXt will create luatex-cache in /tmp
when TEXMFCACHE is set and successfully build the PDF on first run?

Thank you!

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Re: Set luatex cache directory path

[Hans Hagen]

On 4/11/2021 1:30 AM, Thangalin wrote:
> Are two runs always required to generate a PDF when TEXMFCACHE is set?
> 
> $ sudo su -
> $ mkdir -p /opt/context
> $ cd /opt/context
> $ wget http://lmtx.pragma-ade.nl/install-lmtx/context-linux-64.zip 
> <http://lmtx.pragma-ade.nl/install-lmtx/context-linux-64.zip>
> $ unzip *zip
> $ sh install.sh
> $ exit
> $ cat test.tex
> \starttext
> Test
> \stoptext
> $ export TEXMFCACHE=/tmp
> $ rm -rf $TEXMFCACHE/luatex-cache
> $ /opt/context/tex/texmf-linux-64/bin/mtxrun --autogenerate --script 
> mtx-context --autopdf test.tex
> ...
> resolvers       | resolving | remembered file 'mtx-context.lua'
> resolvers       | resolving | remembered file 'mtx-contexts.lua'
> resolvers       | resolving | remembered file 'mtx-context.lua'
> resolvers       | resolving | remembered file 'mtx-t-mtx-context.lua'
> resolvers       | resolving | remembered file 'mtx-t-mtx-contexts.lua'
> resolvers       | resolving | remembered file 'mtx-t-mtx-context.lua'
> resolvers       | resolving | remembered file 'mtx-context.lua'
> mtxrun          | unknown script 'mtx-context.lua' or 'mtx-mtx-context.lua'
> $ /opt/context/tex/texmf-linux-64/bin/mtxrun --script context --version
> mtx-context     | current version: 2021.04.10 17:09
> $ mtxrun --autogenerate --script mtx-context --autopdf test.tex
> ...
> mkiv lua stats  > runtime: 0.432 seconds, 1 processed pages, 1 shipped 
> pages, 2.315 pages/second
> system          | total runtime: 3.318 seconds of 3.372 seconds
> 
> The first run fails; the second run succeeds.
> 
> If TEXMFCACHE is not set, then the first run succeeds. If TEXMFCACHE is 
> set to any non-empty value and $TEXMFCACHE/luatex-cache has not been 
> created, mtxrun always terminates with the same unknown script error.
> 
> What am I missing to ensure that ConTeXt will create luatex-cache in 
> /tmp when TEXMFCACHE is set and successfully build the PDF on first run?
what happens if you also set TEXMFCACHE before running install.sh

-----------------------------------------------------------------
                                           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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___________________________________________________________________________________

Re: Set luatex cache directory path

[Thangalin]

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$ sudo su -
$ rm -rf /opt/context
$ mkdir -p /opt/context
$ cd /opt/context
$ wget http://lmtx.pragma-ade.nl/install-lmtx/context-linux-64.zip
$ unzip *zip
$ export TEXMFCACHE=/tmp
$ sh install.sh
$ exit
$ cat test.tex
\starttext
Test
\stoptext
$ export TEXMFCACHE=/tmp
$ sudo rm -rf /tmp/luatex-cache
$ /opt/context/tex/texmf-linux-64/bin/mtxrun --autogenerate --script
mtx-context --autopdf test.tex
resolvers       | resolving | remembered file 'mtx-context.lua'
resolvers       | resolving | remembered file 'mtx-contexts.lua'
resolvers       | resolving | remembered file 'mtx-context.lua'
resolvers       | resolving | remembered file 'mtx-t-mtx-context.lua'
resolvers       | resolving | remembered file 'mtx-t-mtx-contexts.lua'
resolvers       | resolving | remembered file 'mtx-t-mtx-context.lua'
resolvers       | resolving | remembered file 'mtx-context.lua'
mtxrun          | unknown script 'mtx-context.lua' or 'mtx-mtx-context.lua'

If the cache directory isn't deleted, the PDF is generated. However, as
soon as the computer reboots, or the temporary directory is otherwise
erased, two runs are required.

I've addressed this in my code, but it's a little awkward and somewhat
brittle because the code cannot know what makes for a valid luatex-cache
directory:

    private boolean reinitialize() {
      // variable assignments ... exists = check for luatex-cache directory

      mArgs.clear();
      mArgs.add( TYPESETTER.getName() );

      if( exists ) {
        mArgs.add( "--autogenerate" );
        mArgs.add( "--script" );
        mArgs.add( "mtx-context" );
        mArgs.add( ... remaining args ... );
      }
      else {
        mArgs.add( "--generate" );
      }

      return exists;
    }

    private boolean typeset() throws Exception {
      return reinitialize() ? call() : call() && reinitialize() && call();
    }

    // Invoke ConTeXt to either typeset the document or generate the cache
directory
    public Boolean call() throws Exception {
      final var builder = new ProcessBuilder( mArgs );
      builder.directory( mDirectory.toFile() );

      final var cacheDir = getCacheDir();
      final var env = builder.environment();
      env.put( "TEXMFCACHE", cacheDir.toString() );

      builder.redirectOutput( DISCARD );
      builder.redirectError( DISCARD );

      final var process = builder.start();
      process.waitFor();
      final var exit = process.exitValue();
      process.destroy();
      return exit == 0;
    }

Also, unless my application installs ConTeXt, setting the TEXMFCACHE
directory before the installation begins will require asking users to do
this. Ideally, using the software would take the following steps:

1. Download text editor
2. Download and install ConTeXt (e.g., click link, extract archive, run
install.sh)
3. Run text editor
4. Export PDF (editor configures ConTeXt as required, reducing the number
of steps for end users)

At some point in the future, the editor may prompt the user for permission
to install ConTeXt on their behalf---to simplify step 2---but that's much
more effort.

Stay safe!

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