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nix build --dry-run --json $pathToDrv: empty output #4747

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picnoir opened this issue Apr 27, 2021 · 0 comments · Fixed by #4750
Closed

nix build --dry-run --json $pathToDrv: empty output #4747

picnoir opened this issue Apr 27, 2021 · 0 comments · Fixed by #4750

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@picnoir
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picnoir commented Apr 27, 2021 •
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Describe the bug

nix build --dry-run --json is not returning any output. Instead, it'd be super convenient to have a set containing two lists:

  1. one containing all the drvs nix is planning to build.
  2. another one containing all the paths nix is planning to substitute

Steps To Reproduce

» nix build --dry-run --json /nix/store/rnd34f5qzapr5x9wfcikjymc9nhp34jk-default-Setup.drv 2>/dev/null

<nothing in stdout>

Expected behavior

EDIT: disregard the proposed json output. Let's just have something consistent with nix-build --json (ie. without dry-run).

`nix --version

nix --version 
nix (Nix) 2.4pre20210326_dd77f71
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nix build: make dry-run to print a json output if --json is enabled picnoir/nix
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@edolstra @picnoir