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https://github.com/NixOS/nix
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cafefed421
"content-address*ed*" derivation is misleading because all derivations are *themselves* content-addressed. What may or may not be content-addressed is not derivation itself, but the *output* of the derivation. The outputs are not *part* of the derivation (for then the derivation wouldn't be complete before we built it) but rather separate entities produced by the derivation. "content-adddress*ed*" is not correctly because it can only describe what the derivation *is*, and that is not what we are trying to do. "content-address*ing*" is correct because it describes what the derivation *does* --- it produces content-addressed data.
33 lines
905 B
Nix
33 lines
905 B
Nix
with import ./config.nix;
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# A simple content-addressing derivation.
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# The derivation can be arbitrarily modified by passing a different `seed`,
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# but the output will always be the same
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rec {
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hello = mkDerivation {
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name = "hello";
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buildCommand = ''
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set -x
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echo "Building a CA derivation"
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mkdir -p $out
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echo "Hello World" > $out/hello
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'';
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};
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producingDrv = mkDerivation {
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name = "hello.drv";
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buildCommand = ''
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echo "Copying the derivation"
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cp ${builtins.unsafeDiscardOutputDependency hello.drvPath} $out
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'';
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__contentAddressed = true;
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outputHashMode = "text";
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outputHashAlgo = "sha256";
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};
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wrapper = mkDerivation {
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name = "use-dynamic-drv-in-non-dynamic-drv";
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buildCommand = ''
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echo "Copying the output of the dynamic derivation"
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cp -r ${builtins.outputOf producingDrv.outPath "out"} $out
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'';
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};
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}
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