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add outputs.manifest for diagnosing image size problems

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Daniel Barlow 2022-09-27 22:07:18 +01:00
parent 5e573cef09
commit 2e13f1372e
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README.md
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@ -114,6 +114,16 @@ Assuming you have nixpkgs checked out in a peer directory of this one,
NIX_PATH=nixpkgs=../nixpkgs:$NIX_PATH ./run-tests.sh
## Diagnosing unexpectedly large images
Sometimes you can add a package and it causes the image size to balloon
because it has dependencies on other things you didn't know about. Build the
`outputs.manifest` attribute, which is a json representation of the
filesystem, and you can run `nix-store --query` on it:
NIX_PATH=nixpkgs=../nixpkgs:$NIX_PATH NIXPKGS_ALLOW_UNSUPPORTED_SYSTEM=1 nix-build -I liminix-config=path/to/your/configuration.nix --arg device "import ./devices/qemu.nix" -A outputs.manifest -o manifest
nix-store -q --tree manifest
## Articles of interest