291 lines
8.8 KiB
Go
291 lines
8.8 KiB
Go
package hcl2template
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import (
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"fmt"
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"github.com/hashicorp/hcl/v2"
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"github.com/hashicorp/packer/helper/common"
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"github.com/hashicorp/packer/packer"
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"github.com/zclconf/go-cty/cty"
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)
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// PackerConfig represents a loaded Packer HCL config. It will contain
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// references to all possible blocks of the allowed configuration.
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type PackerConfig struct {
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// Directory where the config files are defined
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Basedir string
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// Available Source blocks
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Sources map[SourceRef]*SourceBlock
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// InputVariables and LocalVariables are the list of defined input and
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// local variables. They are of the same type but are not used in the same
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// way. Local variables will not be decoded from any config file, env var,
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// or ect. Like the Input variables will.
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InputVariables Variables
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LocalVariables Variables
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// Builds is the list of Build blocks defined in the config files.
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Builds Builds
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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() *hcl.EvalContext {
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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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"var": cty.ObjectVal(cfg.InputVariables.Values()),
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"local": cty.ObjectVal(cfg.LocalVariables.Values()),
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},
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}
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return ectx
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}
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// decodeInputVariables looks in the found blocks for 'variables' and
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// 'variable' blocks. It should be called firsthand so that other blocks can
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// use the variables.
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func (c *PackerConfig) decodeInputVariables(f *hcl.File) hcl.Diagnostics {
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var diags hcl.Diagnostics
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content, moreDiags := f.Body.Content(configSchema)
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diags = append(diags, moreDiags...)
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for _, block := range content.Blocks {
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switch block.Type {
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case variableLabel:
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moreDiags := c.InputVariables.decodeVariableBlock(block, nil)
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diags = append(diags, moreDiags...)
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case variablesLabel:
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attrs, moreDiags := block.Body.JustAttributes()
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diags = append(diags, moreDiags...)
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for key, attr := range attrs {
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moreDiags = c.InputVariables.decodeVariable(key, attr, nil)
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diags = append(diags, moreDiags...)
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}
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}
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}
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return diags
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}
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// parseLocalVariables looks in the found blocks for 'locals' blocks. It
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// should be called after parsing input variables so that they can be
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// referenced.
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func (c *PackerConfig) parseLocalVariables(f *hcl.File) ([]*Local, hcl.Diagnostics) {
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var diags hcl.Diagnostics
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content, moreDiags := f.Body.Content(configSchema)
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diags = append(diags, moreDiags...)
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var locals []*Local
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for _, block := range content.Blocks {
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switch block.Type {
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case localsLabel:
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attrs, moreDiags := block.Body.JustAttributes()
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diags = append(diags, moreDiags...)
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for name, attr := range attrs {
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if _, found := c.LocalVariables[name]; found {
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diags = append(diags, &hcl.Diagnostic{
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Severity: hcl.DiagError,
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Summary: "Duplicate value in " + localsLabel,
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Detail: "Duplicate " + name + " definition found.",
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Subject: attr.NameRange.Ptr(),
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Context: block.DefRange.Ptr(),
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})
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return nil, diags
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}
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locals = append(locals, &Local{
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Name: name,
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Expr: attr.Expr,
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})
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}
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}
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}
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return locals, diags
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}
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func (c *PackerConfig) evaluateLocalVariables(locals []*Local) hcl.Diagnostics {
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var diags hcl.Diagnostics
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if len(locals) > 0 && c.LocalVariables == nil {
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c.LocalVariables = Variables{}
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}
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var retry, previousL int
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for len(locals) > 0 {
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local := locals[0]
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moreDiags := c.evaluateLocalVariable(local)
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if moreDiags.HasErrors() {
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if len(locals) == 1 {
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// If this is the only local left there's no need
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// to try evaluating again
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return append(diags, moreDiags...)
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}
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if previousL == len(locals) {
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if retry == 100 {
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// To get to this point, locals must have a circle dependency
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return append(diags, moreDiags...)
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}
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retry++
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}
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previousL = len(locals)
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// If local uses another local that has not been evaluated yet this could be the reason of errors
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// Push local to the end of slice to be evaluated later
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locals = append(locals, local)
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} else {
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retry = 0
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diags = append(diags, moreDiags...)
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}
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// Remove local from slice
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locals = append(locals[:0], locals[1:]...)
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}
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return diags
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}
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func (c *PackerConfig) evaluateLocalVariable(local *Local) hcl.Diagnostics {
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var diags hcl.Diagnostics
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value, moreDiags := local.Expr.Value(c.EvalContext())
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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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}
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c.LocalVariables[local.Name] = &Variable{
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Name: local.Name,
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DefaultValue: value,
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Type: value.Type(),
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}
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return diags
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}
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// getCoreBuildProvisioners takes a list of provisioner block, starts according
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// provisioners and sends parsed HCL2 over to it.
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func (p *Parser) getCoreBuildProvisioners(blocks []*ProvisionerBlock, ectx *hcl.EvalContext, generatedVars map[string]string) ([]packer.CoreBuildProvisioner, hcl.Diagnostics) {
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var diags hcl.Diagnostics
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res := []packer.CoreBuildProvisioner{}
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for _, pb := range blocks {
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provisioner, moreDiags := p.startProvisioner(pb, ectx, generatedVars)
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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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res = append(res, packer.CoreBuildProvisioner{
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PType: pb.PType,
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PName: pb.PName,
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Provisioner: provisioner,
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})
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}
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return res, diags
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}
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// getCoreBuildProvisioners takes a list of post processor block, starts
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// according provisioners and sends parsed HCL2 over to it.
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func (p *Parser) getCoreBuildPostProcessors(blocks []*PostProcessorBlock, ectx *hcl.EvalContext, generatedVars map[string]string) ([]packer.CoreBuildPostProcessor, hcl.Diagnostics) {
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var diags hcl.Diagnostics
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res := []packer.CoreBuildPostProcessor{}
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for _, ppb := range blocks {
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postProcessor, moreDiags := p.startPostProcessor(ppb, ectx, generatedVars)
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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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res = append(res, packer.CoreBuildPostProcessor{
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PostProcessor: postProcessor,
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PName: ppb.PName,
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PType: ppb.PType,
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})
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}
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return res, diags
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}
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// getBuilds will return a list of packer Build based on the HCL2 parsed build
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// blocks. All Builders, Provisioners and Post Processors will be started and
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// configured.
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func (p *Parser) getBuilds(cfg *PackerConfig) ([]packer.Build, hcl.Diagnostics) {
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res := []packer.Build{}
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var diags hcl.Diagnostics
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for _, build := range cfg.Builds {
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for _, from := range build.Sources {
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src, found := cfg.Sources[from]
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if !found {
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diags = append(diags, &hcl.Diagnostic{
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Summary: "Unknown " + sourceLabel + " " + from.String(),
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Subject: build.HCL2Ref.DefRange.Ptr(),
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Severity: hcl.DiagError,
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})
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continue
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}
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builder, moreDiags, generatedVars := p.startBuilder(src, cfg.EvalContext())
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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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// If the builder has provided a list of to-be-generated variables that
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// should be made accessible to provisioners, pass that list into
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// the provisioner prepare() so that the provisioner can appropriately
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// validate user input against what will become available. Otherwise,
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// only pass the default variables, using the basic placeholder data.
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generatedPlaceholderMap := packer.BasicPlaceholderData()
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if generatedVars != nil {
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for _, k := range generatedVars {
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generatedPlaceholderMap[k] = fmt.Sprintf("Build_%s. "+
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common.PlaceholderMsg, k)
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}
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}
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provisioners, moreDiags := p.getCoreBuildProvisioners(build.ProvisionerBlocks, cfg.EvalContext(), generatedPlaceholderMap)
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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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postProcessors, moreDiags := p.getCoreBuildPostProcessors(build.PostProcessors, cfg.EvalContext(), generatedPlaceholderMap)
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pps := [][]packer.CoreBuildPostProcessor{}
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if len(postProcessors) > 0 {
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pps = [][]packer.CoreBuildPostProcessor{postProcessors}
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}
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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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pcb := &packer.CoreBuild{
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Type: src.Type,
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Builder: builder,
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Provisioners: provisioners,
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PostProcessors: pps,
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Prepared: true,
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}
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res = append(res, pcb)
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}
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}
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return res, diags
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}
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// Parse will parse HCL file(s) in path. Path can be a folder or a file.
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//
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// Parse will first parse variables and then the rest; so that interpolation
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// can happen.
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//
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// For each build block a packer.Build will be started, and for each builder,
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// all provisioners and post-processors will be started.
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//
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// Parse then return a slice of packer.Builds; which are what packer core uses
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// to run builds.
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func (p *Parser) Parse(path string, vars map[string]string) ([]packer.Build, hcl.Diagnostics) {
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cfg, diags := p.parse(path, vars)
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if diags.HasErrors() {
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return nil, diags
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}
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builds, moreDiags := p.getBuilds(cfg)
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return builds, append(diags, moreDiags...)
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}
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