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feat(nix/nint): accept attribute set with stdout, stderr and exit

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This extends the calling convention for nint in a non-breaking way: If
the called script returns an attribute set instead of a string the
following is done:

* If the attributes `stdout` and/or `stderr` exist, their content (which
  must be a string currently) is written to the respective output.

* If the attribute `exit` exists, nint will exit with the given exit
  code. Must be a number that can be converted to an `i32`. If it's
  missing, nint will exit without indicating an error.

Change-Id: I209cf178fee3d970fdea3b26e4049e944af47457
Reviewed-on: https://cl.tvl.fyi/c/depot/+/3547
Tested-by: BuildkiteCI
Reviewed-by: tazjin <mail@tazj.in>
This commit is contained in:
sterni 2021-09-14 23:50:01 +02:00
parent 5dec982334
commit 852d059e2f
2 changed files with 57 additions and 3 deletions
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12
nix/nint/README.md
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@ -15,8 +15,16 @@ to the following calling convention:
program name at `builtins.head argv`.
* Extra arguments can be manually passed as described below.
* The return value should always be a string (throwing is also okay)
which is printed to stdout by `nint`.
* The return value must either be
* A string which is rendered to `stdout`.
* An attribute set with the following optional attributes:
* `stdout`: A string that's rendered to `stdout`
* `stderr`: A string that's rendered to `stderr`
* `exit`: A number which is used as an exit code.
If missing, nint always exits with 0 (or equivalent).
## Usage