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bb118c37a2
Previously we were treating "dynamic" blocks in configuration the same as any other block type when merging config bodies, so that dynamic blocks in the override would override any dynamic blocks present in the base, without considering the dynamic block type. It's more useful and intuitive for us to treat dynamic blocks as if they are instances of their given block type for the purpose of overriding. That means a foo block can be overridden by a dynamic "foo" block and vice-versa, and dynamic blocks of different types do not interact at all during overriding. This requires us to recognize dynamic blocks and treat them specially during decoding of a merged body. We leave them unexpanded here because this package is not responsible for dynamic block expansion (that happens in the sibling "lang" package) but we do decode them enough to recognize their labels so we can treat them as if they were blocks of the labelled type.
64 lines
2.2 KiB
Go
64 lines
2.2 KiB
Go
package configs
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import (
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"github.com/hashicorp/hcl2/hcl"
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"github.com/hashicorp/hcl2/hcl/hclsyntax"
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)
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// exprIsNativeQuotedString determines whether the given expression looks like
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// it's a quoted string in the HCL native syntax.
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//
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// This should be used sparingly only for situations where our legacy HCL
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// decoding would've expected a keyword or reference in quotes but our new
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// decoding expects the keyword or reference to be provided directly as
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// an identifier-based expression.
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func exprIsNativeQuotedString(expr hcl.Expression) bool {
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_, ok := expr.(*hclsyntax.TemplateExpr)
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return ok
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}
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// schemaForOverrides takes a *hcl.BodySchema and produces a new one that is
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// equivalent except that any required attributes are forced to not be required.
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//
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// This is useful for dealing with "override" config files, which are allowed
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// to omit things that they don't wish to override from the main configuration.
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//
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// The returned schema may have some pointers in common with the given schema,
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// so neither the given schema nor the returned schema should be modified after
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// using this function in order to avoid confusion.
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//
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// Overrides are rarely used, so it's recommended to just create the override
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// schema on the fly only when it's needed, rather than storing it in a global
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// variable as we tend to do for a primary schema.
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func schemaForOverrides(schema *hcl.BodySchema) *hcl.BodySchema {
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ret := &hcl.BodySchema{
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Attributes: make([]hcl.AttributeSchema, len(schema.Attributes)),
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Blocks: schema.Blocks,
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}
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for i, attrS := range schema.Attributes {
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ret.Attributes[i] = attrS
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ret.Attributes[i].Required = false
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}
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return ret
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}
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// schemaWithDynamic takes a *hcl.BodySchema and produces a new one that
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// is equivalent except that it accepts an additional block type "dynamic" with
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// a single label, used to recognize usage of the HCL dynamic block extension.
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func schemaWithDynamic(schema *hcl.BodySchema) *hcl.BodySchema {
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ret := &hcl.BodySchema{
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Attributes: schema.Attributes,
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Blocks: make([]hcl.BlockHeaderSchema, len(schema.Blocks), len(schema.Blocks)+1),
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}
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copy(ret.Blocks, schema.Blocks)
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ret.Blocks = append(ret.Blocks, hcl.BlockHeaderSchema{
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Type: "dynamic",
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LabelNames: []string{"type"},
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})
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return ret
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}
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