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@ -73,13 +73,22 @@ const (
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dataAccessor = "data"
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)
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type BlockContext int
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const (
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InputVariableContext BlockContext = iota
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LocalContext
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BuildContext
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DatasourceContext
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NilContext
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)
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// EvalContext returns the *hcl.EvalContext that will be passed to an hcl
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// decoder in order to tell what is the actual value of a var or a local and
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// the list of defined functions.
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func (cfg *PackerConfig) EvalContext(variables map[string]cty.Value) *hcl.EvalContext {
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func (cfg *PackerConfig) EvalContext(ctx BlockContext, variables map[string]cty.Value) *hcl.EvalContext {
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inputVariables, _ := cfg.InputVariables.Values()
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localVariables, _ := cfg.LocalVariables.Values()
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datasourceVariables, _ := cfg.Datasources.Values()
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ectx := &hcl.EvalContext{
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Functions: Functions(cfg.Basedir),
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Variables: map[string]cty.Value{
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@ -97,9 +106,25 @@ func (cfg *PackerConfig) EvalContext(variables map[string]cty.Value) *hcl.EvalCo
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"cwd": cty.StringVal(strings.ReplaceAll(cfg.Cwd, `\`, `/`)),
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"root": cty.StringVal(strings.ReplaceAll(cfg.Basedir, `\`, `/`)),
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}),
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dataAccessor: cty.ObjectVal(datasourceVariables),
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},
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}
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// Currently the places where you can make references to other blocks
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// from one is very 'procedural', and in this specific case, we could make
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// the data sources available to other datasources, but this would be
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// order dependant, meaning that if you define two datasources in two
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// different blocks, the second one can use the first one, but not the
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// other way around; which would be totally confusing; so - for now -
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// datasources can't use other datasources.
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// In the future we'd like to load and execute HCL blocks using a graph
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// dependency tree, so that any block can use any block whatever the
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// order.
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switch ctx {
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case LocalContext, BuildContext:
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datasourceVariables, _ := cfg.Datasources.Values()
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ectx.Variables[dataAccessor] = cty.ObjectVal(datasourceVariables)
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}
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for k, v := range variables {
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ectx.Variables[k] = v
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}
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@ -229,7 +254,7 @@ func (c *PackerConfig) evaluateLocalVariables(locals []*LocalBlock) hcl.Diagnost
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func (c *PackerConfig) evaluateLocalVariable(local *LocalBlock) hcl.Diagnostics {
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var diags hcl.Diagnostics
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value, moreDiags := local.Expr.Value(c.EvalContext(nil))
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value, moreDiags := local.Expr.Value(c.EvalContext(LocalContext, nil))
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diags = append(diags, moreDiags...)
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if moreDiags.HasErrors() {
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return diags
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@ -441,7 +466,7 @@ func (cfg *PackerConfig) GetBuilds(opts packer.GetBuildsOptions) ([]packersdk.Bu
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}
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}
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builder, moreDiags, generatedVars := cfg.startBuilder(srcUsage, cfg.EvalContext(nil), opts)
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builder, moreDiags, generatedVars := cfg.startBuilder(srcUsage, cfg.EvalContext(BuildContext, nil), opts)
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diags = append(diags, moreDiags...)
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if moreDiags.HasErrors() {
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continue
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@ -463,12 +488,12 @@ func (cfg *PackerConfig) GetBuilds(opts packer.GetBuildsOptions) ([]packersdk.Bu
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buildAccessor: cty.ObjectVal(unknownBuildValues),
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}
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provisioners, moreDiags := cfg.getCoreBuildProvisioners(srcUsage, build.ProvisionerBlocks, cfg.EvalContext(variables))
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provisioners, moreDiags := cfg.getCoreBuildProvisioners(srcUsage, build.ProvisionerBlocks, cfg.EvalContext(BuildContext, variables))
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diags = append(diags, moreDiags...)
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if moreDiags.HasErrors() {
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continue
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}
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pps, moreDiags := cfg.getCoreBuildPostProcessors(srcUsage, build.PostProcessorsLists, cfg.EvalContext(variables))
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pps, moreDiags := cfg.getCoreBuildPostProcessors(srcUsage, build.PostProcessorsLists, cfg.EvalContext(BuildContext, variables))
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diags = append(diags, moreDiags...)
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if moreDiags.HasErrors() {
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continue
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@ -610,7 +635,7 @@ func (p *PackerConfig) handleEval(line string) (out string, exit bool, diags hcl
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return "", false, diags
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}
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val, valueDiags := expr.Value(p.EvalContext(nil))
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val, valueDiags := expr.Value(p.EvalContext(NilContext, nil))
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diags = append(diags, valueDiags...)
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if valueDiags.HasErrors() {
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return "", false, diags
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Sylvia Moss
5 years ago
committed by
GitHub