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make-binary-wrapper's Introduction

make-binary-wrapper

Tool to generate binary wrappers that wrap executables.

Motivation

In Nixpkgs we often need to wrap executables. Included in Nixpkgs is the makeWrapper bash script for creating shell wrappers. This typically suffices, but not always. On macOS shebangs can't point at interpreted (shebang'd) scripts. Having a binary wrapper (in between) resolves this issue.

Usage

$ make-wrapper --prefix FOO ":" BAR /path/to/my/executable my-new-wrapped

Implementation

The implementation consists of:

  1. a Python executable make-wrapper that creates a JSON wrapper instruction which then compiles
  2. a Nim program that embeds the JSON instruction

File size

The resulting wrappers are approximately 79 kB in size.

Alternative approaches

Some alternatives were considered.

Shell wrappers

As explained in the motivation, the makeWrapper script part of Nixpkgs does not suffice on macOS.

Single JSON instruction for many executables

Instead of creating a JSON instruction per executable, one could have a single JSON file for all executables in an executable, and have the wrappers read that shared JSON file.

This approach is simpler to implement, however, it would be a very Nixpkgs-specific solution.

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