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fix(terraform): support OpenTofu language block #10923

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fix(terraform): support OpenTofu language block #10923

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6c6edf6
fix(terraform): support OpenTofu language block
momomuchu Jul 3, 2026
ee368a1
test(terraform): trim OpenTofu language block regression test
momomuchu Jul 6, 2026
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45 changes: 45 additions & 0 deletions pkg/iac/scanners/terraform/parser/parser_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -164,6 +164,51 @@ check "cats_mittens_is_special" {
require.NotNil(t, checkBlocks[0].GetBlock("assert"))
}

// Test_OpenTofuLanguageBlock reproduces aquasecurity/trivy#10906.
//
// Given a .tofu file using the OpenTofu v1.12 top-level `language` block
// (https://opentofu.org/docs/language/settings/#language-compatibility)
// When the parser reads the file
// Then it must not fail with "Unsupported block type", and the nested
// `compatible_with.opentofu` constraint must be readable.
func Test_OpenTofuLanguageBlock(t *testing.T) {

@nikpivkin nikpivkin Jul 6, 2026

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The Given/When/Then doc comment is out of style for this file — compare with TestConfigWithEphemeralBlock nearby. A link to #10906 is enough. The require messages, the resource block check, and the compatible_with assertions can go — the point of the test is just that the language block no longer triggers "Unsupported block type".

fs := testutil.CreateFS(map[string]string{
"main.tofu": `
language {
compatible_with {
opentofu = ">= 1.12"
}
}

resource "cats_cat" "mittens" {
name = "mittens"
}
`,
})

parser := New(fs, "", OptionStopOnHCLError(true))
err := parser.ParseFS(t.Context(), ".")
require.NoError(t, err, "parser must accept the OpenTofu `language` block")

modules, err := parser.EvaluateAll(t.Context())
require.NoError(t, err)
require.NotEmpty(t, modules)

blocks := modules[0].GetBlocks()

languageBlocks := blocks.OfType("language")
require.Len(t, languageBlocks, 1)

compatibleWith := languageBlocks[0].GetBlock("compatible_with")
require.NotNil(t, compatibleWith)
require.NotNil(t, compatibleWith.GetAttribute("opentofu"))
assert.Equal(t, ">= 1.12", compatibleWith.GetAttribute("opentofu").Value().AsString())

// sanity: the rest of the file still parses normally
resourceBlocks := blocks.OfType("resource")
require.Len(t, resourceBlocks, 1)
}

func Test_Modules(t *testing.T) {

fs := testutil.CreateFS(map[string]string{
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5 changes: 5 additions & 0 deletions pkg/iac/terraform/schema.go
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,11 @@ var Schema = &hcl.BodySchema{
{
Type: "terraform",
},
{
// language declares OpenTofu/language compatibility constraints.
// Introduced in OpenTofu v1.12: https://opentofu.org/docs/language/settings/#language-compatibility
Type: "language",
},
{
Type: "required_providers",
},
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