nixpkgs/pkgs/build-support/buildenv/default.nix

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# buildEnv creates a tree of symlinks to the specified paths. This is
# a fork of the buildEnv in the Nix distribution. Most changes should
# eventually be merged back into the Nix distribution.
{ perl, runCommand }:
{ name
, # The manifest file (if any). A symlink $out/manifest will be
# created to it.
manifest ? ""
, # The paths to symlink.
paths
, # Whether to ignore collisions or abort.
ignoreCollisions ? false
, # The paths (relative to each element of `paths') that we want to
# symlink (e.g., ["/bin"]). Any file not inside any of the
# directories in the list is not symlinked.
pathsToLink ? ["/"]
, # Shell command to run after building the symlink tree.
postBuild ? ""
}:
runCommand name
{ inherit manifest paths ignoreCollisions pathsToLink postBuild; }
''
${perl}/bin/perl -w ${./builder.pl}
eval "$postBuild"
''