Source roots that need to be renamed before they can be used

This article was originally published at https://gist.github.com/joepie91/b0041188c043259e6e1059d026eff301. 

Some applications (such as Brackets) are very picky about the directory name(s) of your unpacked source(s). In this case, you might need to rename one or more source roots before cding into them.

To accomplish this, do something like the following:

{
  # ...
  sourceRoot = ".";
  
  postUnpack = ''
    mv brackets-release-${version} brackets
    mv brackets-shell-${shellBranch} brackets-shell
    cd brackets-shell;
  '';
  # ...
}

This keeps Nix from trying to move into the source directories immediately, by explicitly pointing it at the current (ie. top-most) directory of the environment.