Elm compiler creates a cache directory

[Martin Janiczek]

Hello everybody,

I'm trying to make tup work with the Elm language and failing because of a cache directory.

If needed, the elm-make compiler creates an elm-stuff directory, where it downloads dependencies and puts its incremental build stuff. This behaviour can't be disabled with a flag.

The whole repository is here, if you want to play with it: https://github.com/Janiczek/tup-elm-example

Tupfile:

: elm-package.json *.elm |> elm-make --yes Main.elm |> index.html

Currently fails with:

[ tup ] [0.037s] Scanning filesystem...
[ tup ] [0.052s] Reading in new environment variables...
[ tup ] [0.066s] Parsing Tupfiles...
 1) [0.003s] .
 [ ] 100%
[ tup ] [0.076s] No files to delete.                                                
[ tup ] [0.076s] Generating .gitignore files...
[ tup ] [0.089s] Executing Commands...
 [ ]   0%tup error: Unable to utimens() files not created by this job: /var/www/html/elm/tup-elm-example/elm-stuff/packages/elm-lang-html-1208e71
tup error: Unable to utimens() files not created by this job: /var/www/html/elm/tup-elm-example/elm-stuff/packages/elm-lang-virtual-dom-73c00fd
tup error: Unable to utimens() files not created by this job: /var/www/html/elm/tup-elm-example/elm-stuff/packages/elm-lang-core-7fc14f2
* 1) elm-make --yes Main.elm                                                        
Error: The following HTTP request failed.
<https://github.com/elm-lang/core/zipball/5.1.1/>


elm-lang-core-7fc14f2/: setFileTimes: permission denied (Operation not permitted)




Starting downloads...


  ✗ elm-lang/html 2.0.0
  ✗ elm-lang/virtual-dom 2.0.4
  ✗ elm-lang/core 5.1.1
 *** tup errors ***
 *** Command ID=11 failed with return value 1
tup error: Expected to write to file 'index.html' from cmd 11 but didn't
 [ ] 100%
 *** tup: 1 job failed.

So, the question is, how can I allow creation of these directories and files, without specifying them into the Tupfile?

I've also tried stuff like this, with no success:

: elm-package.json |> elm-make --yes |> elm-stuff
: elm-stuff *.elm |> elm-make --yes Main.elm |> index.html

[Erik Brinkman]

Hey Martin,

I'm not an expert, but I've asked and dealt with similar issues in the past. The short of it is that tup was designed to give consistent builds always. As such, it essentially doesn't allow for cache files and directories because then it can't guarantee that the exact same things are running. If you want to use tup to build it, then the trivial way would be to do

: elm-package.json |> elm-make --yes Main.elm && rm -rf elm-stuff |> index.html

This is probably not ideal, as based on what you've described, each build is going to have elm re-download every dependency, in addition to a cache-less build. I don't think you can get away from cache with tup, but you might be able to get around the dependency download. The high level would be that you want to set up rules for the pieces that are downloaded. Assuming elm-make won't write to them if they're up to date, and the dependencies are written to different files then the cache with predictable names, you could do something like:

: elm-package.json |> ... |> elm-stuff/... <deps>

: elm-package.json <deps> |> elm-make --yes Main.elm && rm ...cache files... |> index.html

I'm not sure what the first command is, but you could probably be clever by using the lua api to parse the elm-dependencies to generate what those commands are.

The second part of the last command could probably be something like `comm -23 <(ls elm-stuff) <(<<< "%<deps>" tr ' ' '\n' | sort) | xargs rm -rf`.

Hope that helps,

Erik

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