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makeBinaryWrapper: create binary wrappers #95569

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makeBinaryWrapper: create binary wrappers #95569

wants to merge 2 commits into from

Commits on Aug 16, 2020

  1. makeBinaryWrapper: create binary wrappers 

    When packaging programs we often need to change the environment the program is run in.
Typically this is done using wrappers. Thus far, the wrappers produced were typically
shell scripts, thus interpreted, and with a shebang. This is an issue on e.g. Darwin,
where shebangs cannot point at interpreted scripts.

This commit introduces a new program for creating binary wrappers. The program, written
currently in Python, produces an instruction in JSON which is loaded into a Nim program
and then compiled into a binary.

With interpreted wrappers one can easily check the code to see what it is doing, but with
a binary that is more difficult. To that end, an environment variable `NIX_DEBUG_WRAPPER`
is introduced which, when set, causes an executed wrapper to print the embedded JSON
instead of exec'ing into the wrapped executable.

The Python program aims to be compatible with the existing `makeWrapper` but is lacking
features, mostly because of difficulties with implementing them using `argparse`.
    @FRidh
    FRidh committed Aug 16, 2020
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  2. nim: add minimal option that is stripped of its dependencies 

    For `makeBinaryWrapper` we preferably keep the closure small so it can
be used early on during bootstrapping.
    @FRidh
    FRidh committed Aug 16, 2020
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