329 lines
9.6 KiB
Go
329 lines
9.6 KiB
Go
package hcl2template
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import (
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"fmt"
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"os"
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"path/filepath"
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"github.com/hashicorp/go-version"
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"github.com/hashicorp/hcl/v2"
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"github.com/hashicorp/hcl/v2/ext/dynblock"
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"github.com/hashicorp/hcl/v2/hclparse"
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"github.com/hashicorp/packer/packer"
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packersdk "github.com/hashicorp/packer/packer-plugin-sdk/packer"
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"github.com/zclconf/go-cty/cty"
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)
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const (
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packerLabel = "packer"
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sourceLabel = "source"
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variablesLabel = "variables"
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variableLabel = "variable"
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localsLabel = "locals"
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buildLabel = "build"
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communicatorLabel = "communicator"
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)
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var configSchema = &hcl.BodySchema{
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Blocks: []hcl.BlockHeaderSchema{
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{Type: packerLabel},
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{Type: sourceLabel, LabelNames: []string{"type", "name"}},
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{Type: variablesLabel},
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{Type: variableLabel, LabelNames: []string{"name"}},
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{Type: localsLabel},
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{Type: buildLabel},
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{Type: communicatorLabel, LabelNames: []string{"type", "name"}},
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},
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}
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// packerBlockSchema is the schema for a top-level "packer" block in
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// a configuration file.
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var packerBlockSchema = &hcl.BodySchema{
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Attributes: []hcl.AttributeSchema{
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{Name: "required_version"},
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},
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}
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// Parser helps you parse HCL folders. It will parse an hcl file or directory
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// and start builders, provisioners and post-processors to configure them with
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// the parsed HCL and then return a []packer.Build. Packer will use that list
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// of Builds to run everything in order.
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type Parser struct {
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CorePackerVersion *version.Version
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CorePackerVersionString string
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*hclparse.Parser
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BuilderSchemas packer.BuilderStore
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ProvisionersSchemas packer.ProvisionerStore
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PostProcessorsSchemas packer.PostProcessorStore
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}
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const (
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hcl2FileExt = ".pkr.hcl"
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hcl2JsonFileExt = ".pkr.json"
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hcl2VarFileExt = ".auto.pkrvars.hcl"
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hcl2VarJsonFileExt = ".auto.pkrvars.json"
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)
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// Parse will Parse all HCL files in filename. 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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// Parse returns a PackerConfig that contains configuration layout of a packer
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// build; sources(builders)/provisioners/posts-processors will not be started
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// and their contents wont be verified; Most syntax errors will cause an error.
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func (p *Parser) Parse(filename string, varFiles []string, argVars map[string]string) (*PackerConfig, hcl.Diagnostics) {
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var files []*hcl.File
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var diags hcl.Diagnostics
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// parse config files
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if filename != "" {
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hclFiles, jsonFiles, moreDiags := GetHCL2Files(filename, hcl2FileExt, hcl2JsonFileExt)
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diags = append(diags, moreDiags...)
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if len(hclFiles)+len(jsonFiles) == 0 {
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diags = append(diags, &hcl.Diagnostic{
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Severity: hcl.DiagError,
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Summary: "Could not find any config file in " + filename,
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Detail: "A config file must be suffixed with `.pkr.hcl` or " +
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"`.pkr.json`. A folder can be referenced.",
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})
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}
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for _, filename := range hclFiles {
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f, moreDiags := p.ParseHCLFile(filename)
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diags = append(diags, moreDiags...)
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files = append(files, f)
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}
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for _, filename := range jsonFiles {
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f, moreDiags := p.ParseJSONFile(filename)
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diags = append(diags, moreDiags...)
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files = append(files, f)
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}
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if diags.HasErrors() {
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return nil, diags
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}
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}
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basedir := filename
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if isDir, err := isDir(basedir); err == nil && !isDir {
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basedir = filepath.Dir(basedir)
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}
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wd, err := os.Getwd()
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if err != nil {
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diags = append(diags, &hcl.Diagnostic{
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Severity: hcl.DiagError,
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Summary: "Could not find current working directory",
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Detail: err.Error(),
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})
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}
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cfg := &PackerConfig{
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Basedir: basedir,
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Cwd: wd,
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CorePackerVersionString: p.CorePackerVersionString,
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builderSchemas: p.BuilderSchemas,
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provisionersSchemas: p.ProvisionersSchemas,
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postProcessorsSchemas: p.PostProcessorsSchemas,
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parser: p,
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files: files,
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}
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for _, file := range files {
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coreVersionConstraints, moreDiags := sniffCoreVersionRequirements(file.Body)
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cfg.Packer.VersionConstraints = append(cfg.Packer.VersionConstraints, coreVersionConstraints...)
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diags = append(diags, moreDiags...)
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}
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// Before we go further, we'll check to make sure this version can read
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// that file, so we can produce a version-related error message rather than
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// potentially-confusing downstream errors.
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versionDiags := cfg.CheckCoreVersionRequirements(p.CorePackerVersion)
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diags = append(diags, versionDiags...)
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if versionDiags.HasErrors() {
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return cfg, diags
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}
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// Decode variable blocks so that they are available later on. Here locals
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// can use input variables so we decode them firsthand.
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{
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for _, file := range files {
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diags = append(diags, cfg.decodeInputVariables(file)...)
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}
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for _, file := range files {
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moreLocals, morediags := cfg.parseLocalVariables(file)
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diags = append(diags, morediags...)
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cfg.LocalBlocks = append(cfg.LocalBlocks, moreLocals...)
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}
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}
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// parse var files
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{
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hclVarFiles, jsonVarFiles, moreDiags := GetHCL2Files(filename, hcl2VarFileExt, hcl2VarJsonFileExt)
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diags = append(diags, moreDiags...)
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for _, file := range varFiles {
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switch filepath.Ext(file) {
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case ".hcl":
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hclVarFiles = append(hclVarFiles, file)
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case ".json":
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jsonVarFiles = append(jsonVarFiles, file)
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default:
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diags = append(moreDiags, &hcl.Diagnostic{
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Severity: hcl.DiagError,
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Summary: "Could not guess format of " + file,
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Detail: "A var file must be suffixed with `.hcl` or `.json`.",
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})
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}
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}
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var varFiles []*hcl.File
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for _, filename := range hclVarFiles {
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f, moreDiags := p.ParseHCLFile(filename)
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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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varFiles = append(varFiles, f)
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}
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for _, filename := range jsonVarFiles {
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f, moreDiags := p.ParseJSONFile(filename)
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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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varFiles = append(varFiles, f)
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}
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diags = append(diags, cfg.collectInputVariableValues(os.Environ(), varFiles, argVars)...)
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}
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return cfg, diags
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}
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// sniffCoreVersionRequirements does minimal parsing of the given body for
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// "packer" blocks with "required_version" attributes, returning the
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// requirements found.
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//
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// This is intended to maximize the chance that we'll be able to read the
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// requirements (syntax errors notwithstanding) even if the config file contains
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// constructs that might've been added in future versions
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//
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// This is a "best effort" sort of method which will return constraints it is
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// able to find, but may return no constraints at all if the given body is
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// so invalid that it cannot be decoded at all.
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func sniffCoreVersionRequirements(body hcl.Body) ([]VersionConstraint, hcl.Diagnostics) {
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var sniffRootSchema = &hcl.BodySchema{
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Blocks: []hcl.BlockHeaderSchema{
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{
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Type: packerLabel,
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},
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},
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}
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rootContent, _, diags := body.PartialContent(sniffRootSchema)
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var constraints []VersionConstraint
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for _, block := range rootContent.Blocks {
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content, blockDiags := block.Body.Content(packerBlockSchema)
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diags = append(diags, blockDiags...)
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attr, exists := content.Attributes["required_version"]
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if !exists {
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continue
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}
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constraint, constraintDiags := decodeVersionConstraint(attr)
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diags = append(diags, constraintDiags...)
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if !constraintDiags.HasErrors() {
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constraints = append(constraints, constraint)
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}
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}
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return constraints, diags
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}
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func (cfg *PackerConfig) Initialize() hcl.Diagnostics {
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var diags hcl.Diagnostics
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_, moreDiags := cfg.InputVariables.Values()
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diags = append(diags, moreDiags...)
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_, moreDiags = cfg.LocalVariables.Values()
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diags = append(diags, moreDiags...)
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diags = append(diags, cfg.evaluateLocalVariables(cfg.LocalBlocks)...)
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for _, variable := range cfg.InputVariables {
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if !variable.Sensitive {
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continue
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}
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value, _ := variable.Value()
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_ = cty.Walk(value, func(_ cty.Path, nested cty.Value) (bool, error) {
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if nested.IsWhollyKnown() && !nested.IsNull() && nested.Type().Equals(cty.String) {
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packersdk.LogSecretFilter.Set(nested.AsString())
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}
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return true, nil
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})
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}
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// decode the actual content
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for _, file := range cfg.files {
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diags = append(diags, cfg.parser.decodeConfig(file, cfg)...)
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}
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return diags
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}
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// decodeConfig looks in the found blocks for everything that is not a variable
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// block. It should be called after parsing input variables and locals so that
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// they can be referenced.
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func (p *Parser) decodeConfig(f *hcl.File, cfg *PackerConfig) hcl.Diagnostics {
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var diags hcl.Diagnostics
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body := dynblock.Expand(f.Body, cfg.EvalContext(nil))
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content, moreDiags := 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 sourceLabel:
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source, moreDiags := p.decodeSource(block)
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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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ref := source.Ref()
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if existing, found := cfg.Sources[ref]; found {
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diags = append(diags, &hcl.Diagnostic{
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Severity: hcl.DiagError,
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Summary: "Duplicate " + sourceLabel + " block",
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Detail: fmt.Sprintf("This "+sourceLabel+" block has the "+
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"same builder type and name as a previous block declared "+
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"at %s. Each "+sourceLabel+" must have a unique name per builder type.",
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existing.block.DefRange.Ptr()),
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Subject: source.block.DefRange.Ptr(),
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})
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continue
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}
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if cfg.Sources == nil {
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cfg.Sources = map[SourceRef]SourceBlock{}
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}
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cfg.Sources[ref] = source
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case buildLabel:
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build, moreDiags := p.decodeBuildConfig(block, cfg)
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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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cfg.Builds = append(cfg.Builds, build)
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}
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}
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return diags
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}
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