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Merge pull request #13400 from NixOS/fix-deep-overrides

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Fix deep flake input overrides
This commit is contained in:
Eelco Dolstra 2025-07-01 19:34:55 +02:00 • committed by GitHub
commit 5879ab1577
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2 changed files with 93 additions and 14 deletions
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24
src/libflake/flake.cc
View file

@ -101,7 +101,6 @@ static void parseFlakeInputAttr(
static FlakeInput parseFlakeInput(
EvalState & state,
std::string_view inputName,
Value * value,
const PosIdx pos,
const InputAttrPath & lockRootAttrPath,
@ -171,8 +170,8 @@ static FlakeInput parseFlakeInput(
input.ref = parseFlakeRef(state.fetchSettings, *url, {}, true, input.isFlake, true);
}
if (!input.follows && !input.ref)
input.ref = FlakeRef::fromAttrs(state.fetchSettings, {{"type", "indirect"}, {"id", std::string(inputName)}});
if (input.ref && input.follows)
throw Error("flake input has both a flake reference and a follows attribute, at %s", state.positions[pos]);
return input;
}
@ -201,7 +200,6 @@ static std::pair<std::map<FlakeId, FlakeInput>, fetchers::Attrs> parseFlakeInput
} else {
inputs.emplace(inputName,
parseFlakeInput(state,
inputName,
inputAttr.value,
inputAttr.pos,
lockRootAttrPath,
@ -483,18 +481,27 @@ LockedFlake lockFlake(
/* Get the overrides (i.e. attributes of the form
'inputs.nixops.inputs.nixpkgs.url = ...'). */
for (auto & [id, input] : flakeInputs) {
std::function<void(const FlakeInput & input, const InputAttrPath & prefix)> addOverrides;
addOverrides = [&](const FlakeInput & input, const InputAttrPath & prefix)
{
for (auto & [idOverride, inputOverride] : input.overrides) {
auto inputAttrPath(inputAttrPathPrefix);
inputAttrPath.push_back(id);
auto inputAttrPath(prefix);
inputAttrPath.push_back(idOverride);
if (inputOverride.ref || inputOverride.follows)
overrides.emplace(inputAttrPath,
OverrideTarget {
.input = inputOverride,
.sourcePath = sourcePath,
.parentInputAttrPath = inputAttrPathPrefix
});
addOverrides(inputOverride, inputAttrPath);
}
};
for (auto & [id, input] : flakeInputs) {
auto inputAttrPath(inputAttrPathPrefix);
inputAttrPath.push_back(id);
addOverrides(input, inputAttrPath);
}
/* Check whether this input has overrides for a
@ -550,7 +557,8 @@ LockedFlake lockFlake(
continue;
}
assert(input.ref);
if (!input.ref)
input.ref = FlakeRef::fromAttrs(state.fetchSettings, {{"type", "indirect"}, {"id", std::string(id)}});
auto overriddenParentPath =
input.ref->input.isRelative()

71
tests/functional/flakes/follow-paths.sh
View file

@ -359,3 +359,74 @@ rm "$flakeFollowsCustomUrlA"/flake.lock
json=$(nix flake metadata "$flakeFollowsCustomUrlA" --override-input B/C "$flakeFollowsCustomUrlD" --json)
echo "$json" | jq .locks.nodes.C.original
[[ $(echo "$json" | jq -r .locks.nodes.C.original.path) = './flakeC' ]]
# Test deep overrides, e.g. `inputs.B.inputs.C.inputs.D.follows = ...`.
cat <<EOF > $flakeFollowsD/flake.nix
{ outputs = _: {}; }
EOF
cat <<EOF > $flakeFollowsC/flake.nix
{
inputs.D.url = "path:nosuchflake";
outputs = _: {};
}
EOF
cat <<EOF > $flakeFollowsB/flake.nix
{
inputs.C.url = "path:$flakeFollowsC";
outputs = _: {};
}
EOF
cat <<EOF > $flakeFollowsA/flake.nix
{
inputs.B.url = "path:$flakeFollowsB";
inputs.D.url = "path:$flakeFollowsD";
inputs.B.inputs.C.inputs.D.follows = "D";
outputs = _: {};
}
EOF
nix flake lock $flakeFollowsA
[[ $(jq -c .nodes.C.inputs.D $flakeFollowsA/flake.lock) = '["D"]' ]]
# Test overlapping flake follows: B has D follow C/D, while A has B/C follow C
cat <<EOF > $flakeFollowsC/flake.nix
{
inputs.D.url = "path:$flakeFollowsD";
outputs = _: {};
}
EOF
cat <<EOF > $flakeFollowsB/flake.nix
{
inputs.C.url = "path:nosuchflake";
inputs.D.follows = "C/D";
outputs = _: {};
}
EOF
cat <<EOF > $flakeFollowsA/flake.nix
{
inputs.B.url = "path:$flakeFollowsB";
inputs.C.url = "path:$flakeFollowsC";
inputs.B.inputs.C.follows = "C";
outputs = _: {};
}
EOF
# bug was not triggered without recreating the lockfile
nix flake lock $flakeFollowsA --recreate-lock-file
[[ $(jq -c .nodes.B.inputs.D $flakeFollowsA/flake.lock) = '["B","C","D"]' ]]
# Check that you can't have both a flakeref and a follows attribute on an input.
cat <<EOF > $flakeFollowsB/flake.nix
{
inputs.C.url = "path:nosuchflake";
inputs.D.url = "path:nosuchflake";
inputs.D.follows = "C/D";
outputs = _: {};
}
EOF
expectStderr 1 nix flake lock $flakeFollowsA --recreate-lock-file | grepQuiet "flake input has both a flake reference and a follows attribute"