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fetchClosure: Allow input addressed paths in pure mode

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When explicitly requested by the caller, as suggested in the meeting
(https://github.com/NixOS/nix/pull/8090#issuecomment-1531139324)

> @edolstra: { toPath } vs { fromPath } is too implicit

I've opted for the `inputAddressed = true` requirement, because it
we did not agree on renaming the path attributes.

> @roberth: more explicit
> @edolstra: except for the direction; not immediately clear in which direction the rewriting happens

This is in fact the most explicit syntax and a bit redundant, which is
good, because that redundancy lets us deliver an error message that
reminds expression authors that CA provides a better experience to
their users.
This commit is contained in:
Robert Hensing 2023-05-19 10:48:53 +02:00
parent 7e5b6d2c45
commit ea30f152b7
2 changed files with 57 additions and 13 deletions
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16
tests/fetchClosure.sh
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@ -35,16 +35,28 @@ clearStore
if [[ "$NIX_REMOTE" != "daemon" ]]; then
# In impure mode, we can use non-CA paths.
[[ $(nix eval --raw --no-require-sigs --impure --expr "
# We can use non-CA paths when we ask explicitly.
[[ $(nix eval --raw --no-require-sigs --expr "
builtins.fetchClosure {
fromStore = \"file://$cacheDir\";
fromPath = $nonCaPath;
inputAddressed = true;
}
") = $nonCaPath ]]
[ -e $nonCaPath ]
# .. but only if we ask explicitly.
expectStderr 1 nix eval --raw --no-require-sigs --expr "
builtins.fetchClosure {
fromStore = \"file://$cacheDir\";
fromPath = $nonCaPath;
}
" | grepQuiet -E "The .fromPath. value .* is input addressed, but input addressing was not requested. If you do intend to return an input addressed store path, add .inputAddressed = true;. to the .fetchClosure. arguments."
[ -e $nonCaPath ]
fi
# 'toPath' set to empty string should fail but print the expected path.