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Merge pull request #6663 from Ma27/follows-invalid-input

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flakes: throw an error if `follows`-declaration for an input is invalid
This commit is contained in:
Théophane Hufschmitt 2022-07-12 16:44:22 +02:00 committed by GitHub
commit 2dbd5ed0b4
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2 changed files with 55 additions and 1 deletions
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35
src/libexpr/flake/flake.cc
View file

@ -352,6 +352,39 @@ LockedFlake lockFlake(
std::vector<FlakeRef> parents;
std::function<void(
const InputPath & inputPathPrefix,
const FlakeInputs & flakeInputs
)>
checkFollowsDeclarations;
checkFollowsDeclarations = [&](
const InputPath & inputPathPrefix,
const FlakeInputs & flakeInputs
) {
for (auto [inputPath, inputOverride] : overrides) {
auto inputPath2(inputPath);
auto follow = inputPath2.back();
inputPath2.pop_back();
if (inputPath2 == inputPathPrefix
&& flakeInputs.find(follow) == flakeInputs.end()
) {
std::string root;
for (auto & element : inputPath2) {
root.append(element);
if (element != inputPath2.back()) {
root.append(".inputs.");
}
}
warn(
"%s has a `follows'-declaration for a non-existant input %s!",
root,
follow
);
}
}
};
std::function<void(
const FlakeInputs & flakeInputs,
std::shared_ptr<Node> node,
@ -373,6 +406,8 @@ LockedFlake lockFlake(
{
debug("computing lock file node '%s'", printInputPath(inputPathPrefix));
checkFollowsDeclarations(inputPathPrefix, flakeInputs);
/* Get the overrides (i.e. attributes of the form
'inputs.nixops.inputs.nixpkgs.url = ...'). */
for (auto & [id, input] : flakeInputs) {

21
tests/flakes.sh
View file

@ -801,6 +801,8 @@ nix flake metadata $flakeFollowsA
nix flake update $flakeFollowsA
nix flake lock $flakeFollowsA
oldLock="$(cat "$flakeFollowsA/flake.lock")"
# Ensure that locking twice doesn't change anything
@ -823,7 +825,6 @@ cat > $flakeFollowsA/flake.nix <<EOF
inputs = {
B = {
url = "path:./flakeB";
inputs.nonFlake.follows = "D";
};
D.url = "path:./flakeD";
};
@ -859,3 +860,21 @@ nix store delete $(nix store add-path $badFlakeDir)
[[ $(nix path-info $(nix store add-path $flake1Dir)) =~ flake1 ]]
[[ $(nix path-info path:$(nix store add-path $flake1Dir)) =~ simple ]]
# Non-existant follows causes an error
cat >$flakeFollowsA/flake.nix <<EOF
{
description = "Flake A";
inputs.B = {
url = "path:./flakeB";
inputs.invalid.follows = "D";
};
inputs.D.url = "path:./flakeD";
outputs = { ... }: {};
}
EOF
git -C $flakeFollowsA add flake.nix
nix flake lock $flakeFollowsA 2>&1 | grep "warning: B has a \`follows'-declaration for a non-existant input invalid!"