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Don't allow flake inputs to have both a flakeref and a follows

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Having both doesn't make sense so it's best to disallow it. If this
causes issues we could turn into a warning.
This commit is contained in:
Eelco Dolstra 2025-06-12 20:38:51 +02:00
parent 637c4f3ad7
commit b415faceca
2 changed files with 15 additions and 1 deletions
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3
src/libflake/flake.cc
View file

@ -170,6 +170,9 @@ static FlakeInput parseFlakeInput(
input.ref = parseFlakeRef(state.fetchSettings, *url, {}, true, input.isFlake, true);
}
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;
}

13
tests/functional/flakes/follow-paths.sh
View file

@ -401,7 +401,6 @@ EOF
cat <<EOF > $flakeFollowsB/flake.nix
{
inputs.C.url = "path:nosuchflake";
inputs.D.url = "path:nosuchflake";
inputs.D.follows = "C/D";
outputs = _: {};
}
@ -419,3 +418,15 @@ EOF
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"