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Derivations can output "text-hashed" data

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In particular, this means that derivations can output derivations. But
that ramification isn't (yet!) useful as we would want, since there is
no way to have a dependent derivation that is itself a dependent
derivation.
This commit is contained in:
John Ericson 2020-10-12 23:51:23 +00:00
parent a0f369aa3f
commit a4e5de1b9d
15 changed files with 322 additions and 137 deletions
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29
tests/text-hashed-output.nix Normal file
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@ -0,0 +1,29 @@
with import ./config.nix;
# A simple content-addressed derivation.
# The derivation can be arbitrarily modified by passing a different `seed`,
# but the output will always be the same
rec {
root = mkDerivation {
name = "text-hashed-root";
buildCommand = ''
set -x
echo "Building a CA derivation"
mkdir -p $out
echo "Hello World" > $out/hello
'';
__contentAddressed = true;
outputHashMode = "recursive";
outputHashAlgo = "sha256";
};
dependent = mkDerivation {
name = "text-hashed-root.drv";
buildCommand = ''
echo "Copying the derivation"
cp ${root.drvPath} $out
'';
__contentAddressed = true;
outputHashMode = "text";
outputHashAlgo = "sha256";
};
}