installPhase = ''
    runHook preInstall

    wrapProgram "$out/bin/phpdoc" \
      --suffix APP_CACHE_DIR : /tmp \
      --suffix APP_LOG_DIR : /tmp/log

    runHook postInstall
  '';

In this installPhase, I'm trying to let user customize APP_CACHE_DIR and APP_LOG_DIR. When I run the program as such: APP_CACHE_DIR=./abc APP_LOG_DIR=./abc ./result/bin/phpdoc, a directory: abc: (hence the semicolon) is created. I tried to tweak the wrapProgram call but I can't find a valid and working solution.
What am I doing wrong here?

Hey all, I would like to push further this PR: https://github.com/NixOS/nixpkgs/pull/225401
There is one part where some help would be very welcome.
Basically the core of this builder is baed on a Composer Plugin.
It is used at the same time while building the local Composer repository and while doing the composer install.
I would like to reduce the coupling between those two processes.
Basically, "Composer With Local Composer Plugin" is built in the outer process and then it is passed as argument to the inner process (the one building the composer repository).
Having that plugin enabled is mandatory to get this whole thing working.
So, I'm looking for a way to have some kind of generic derivation for composer when I could 2 things to it: a COMPOSER_HOME variable and a composer derivation.

Apparently, adding a composerHome parameter to the current composer derivation is not the best pattern. So, I'm looking for some help on how to achieve this in a better way.

Do you have ideas?