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Detect cycles in flake follows.

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This change results in an error thrown as opposed to segfaulting due to
stack overflow.

Fixes #9144
This commit is contained in:
Vladimir Kryachko 2023-10-16 13:00:49 -04:00
parent 6bf68c1e64
commit b3fd7db63f
2 changed files with 50 additions and 4 deletions
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32
tests/functional/flakes/follow-paths.sh
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@ -167,7 +167,7 @@ nix flake lock "$flakeFollowsA" 2>&1 | grep "warning: input 'B' has an override
#
# The message was
# error: input 'B/D' follows a non-existent input 'B/C/D'
#
#
# Note that for `B` to resolve its follow for `D`, it needs `C/D`, for which it needs to resolve the follow on `C` first.
flakeFollowsOverloadA="$TEST_ROOT/follows/overload/flakeA"
flakeFollowsOverloadB="$TEST_ROOT/follows/overload/flakeA/flakeB"
@ -230,3 +230,33 @@ git -C "$flakeFollowsOverloadA" add flake.nix flakeB/flake.nix \
nix flake metadata "$flakeFollowsOverloadA"
nix flake update "$flakeFollowsOverloadA"
nix flake lock "$flakeFollowsOverloadA"
# Now test follow cycle detection
# We construct the following follows graph:
#
# foo
# / ^
# / \
# v \
# bar -> baz
# The message was
# error: follow cycle detected: [baz -> foo -> bar -> baz]
flakeFollowCycle="$TEST_ROOT/follows/followCycle"
# Test following path flakerefs.
mkdir -p "$flakeFollowCycle"
cat > $flakeFollowCycle/flake.nix <<EOF
{
description = "Flake A";
inputs = {
foo.follows = "bar";
bar.follows = "baz";
baz.follows = "foo";
};
outputs = { ... }: {};
}
EOF
checkRes=$(nix flake lock "$flakeFollowCycle" 2>&1 && fail "nix flake lock should have failed." || true)
echo $checkRes | grep -F "error: follow cycle detected: [baz -> foo -> bar -> baz]"