packer-cn/hcl2template/types.variables.go

378 lines
10 KiB
Go

package hcl2template
import (
"fmt"
"strings"
"github.com/hashicorp/hcl/v2"
"github.com/hashicorp/hcl/v2/ext/typeexpr"
"github.com/hashicorp/hcl/v2/gohcl"
"github.com/hashicorp/hcl/v2/hclsyntax"
"github.com/zclconf/go-cty/cty"
"github.com/zclconf/go-cty/cty/convert"
)
// Local represents a single entry from a "locals" block in a module or file.
// The "locals" block itself is not represented, because it serves only to
// provide context for us to interpret its contents.
type Local struct {
Name string
Expr hcl.Expression
}
type Variable struct {
// CmdValue, VarfileValue, EnvValue, DefaultValue are possible values of
// the variable; The first value set from these will be the one used. If
// none is set; an error will be returned if a user tries to use the
// Variable.
CmdValue cty.Value
VarfileValue cty.Value
EnvValue cty.Value
DefaultValue cty.Value
// Cty Type of the variable. If the default value or a collected value is
// not of this type nor can be converted to this type an error diagnostic
// will show up. This allows us to assume that values are valid later in
// code.
//
// When a default value - and no type - is passed in the variable
// declaration, the type of the default variable will be used. This will
// allow to ensure that users set this variable correctly.
Type cty.Type
// Description of the variable
Description string
// When Sensitive is set to true Packer will try it best to hide/obfuscate
// the variable from the output stream. By replacing the text.
Sensitive bool
block *hcl.Block
}
func (v *Variable) GoString() string {
return fmt.Sprintf("{Type:%q,CmdValue:%q,VarfileValue:%q,EnvValue:%q,DefaultValue:%q}",
v.Type.GoString(), v.CmdValue.GoString(), v.VarfileValue.GoString(), v.EnvValue.GoString(), v.DefaultValue.GoString())
}
func (v *Variable) Value() (cty.Value, *hcl.Diagnostic) {
for _, value := range []cty.Value{
v.CmdValue,
v.VarfileValue,
v.EnvValue,
v.DefaultValue,
} {
if !value.IsNull() {
return value, nil
}
}
return cty.NilVal, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Unset variable",
Detail: "A used variable must be set; see " +
"https://packer.io/docs/configuration/from-1.5/syntax.html for details.",
Context: v.block.DefRange.Ptr(),
}
}
type Variables map[string]*Variable
func (variables Variables) Values() map[string]cty.Value {
res := map[string]cty.Value{}
for k, v := range variables {
res[k], _ = v.Value()
}
return res
}
// decodeVariable decodes a variable key and value into Variables
func (variables *Variables) decodeVariable(key string, attr *hcl.Attribute, ectx *hcl.EvalContext) hcl.Diagnostics {
var diags hcl.Diagnostics
if (*variables) == nil {
(*variables) = Variables{}
}
if _, found := (*variables)[key]; found {
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Duplicate variable",
Detail: "Duplicate " + key + " variable definition found.",
Subject: attr.NameRange.Ptr(),
})
return diags
}
value, moreDiags := attr.Expr.Value(ectx)
diags = append(diags, moreDiags...)
if moreDiags.HasErrors() {
return diags
}
(*variables)[key] = &Variable{
DefaultValue: value,
Type: value.Type(),
}
return diags
}
// decodeVariableBlock decodes a "variables" section the way packer 1 used to
func (variables *Variables) decodeVariableBlock(block *hcl.Block, ectx *hcl.EvalContext) hcl.Diagnostics {
if (*variables) == nil {
(*variables) = Variables{}
}
if _, found := (*variables)[block.Labels[0]]; found {
return []*hcl.Diagnostic{{
Severity: hcl.DiagError,
Summary: "Duplicate variable",
Detail: "Duplicate " + block.Labels[0] + " variable definition found.",
Context: block.DefRange.Ptr(),
}}
}
var b struct {
Description string `hcl:"description,optional"`
Sensitive bool `hcl:"sensitive,optional"`
Rest hcl.Body `hcl:",remain"`
}
diags := gohcl.DecodeBody(block.Body, nil, &b)
if diags.HasErrors() {
return diags
}
res := &Variable{
Description: b.Description,
Sensitive: b.Sensitive,
block: block,
}
attrs, moreDiags := b.Rest.JustAttributes()
diags = append(diags, moreDiags...)
if t, ok := attrs["type"]; ok {
delete(attrs, "type")
tp, moreDiags := typeexpr.Type(t.Expr)
diags = append(diags, moreDiags...)
if moreDiags.HasErrors() {
return diags
}
res.Type = tp
delete(attrs, "type")
}
if def, ok := attrs["default"]; ok {
delete(attrs, "default")
defaultValue, moreDiags := def.Expr.Value(ectx)
diags = append(diags, moreDiags...)
if moreDiags.HasErrors() {
return diags
}
if res.Type != cty.NilType {
var err error
defaultValue, err = convert.Convert(defaultValue, res.Type)
if err != nil {
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Invalid default value for variable",
Detail: fmt.Sprintf("This default value is not compatible with the variable's type constraint: %s.", err),
Subject: def.Expr.Range().Ptr(),
})
defaultValue = cty.DynamicVal
}
}
res.DefaultValue = defaultValue
}
if len(attrs) > 0 {
keys := []string{}
for k := range attrs {
keys = append(keys, k)
}
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagWarning,
Summary: "Unknown keys",
Detail: fmt.Sprintf("unknown variable setting(s): %s", keys),
Context: block.DefRange.Ptr(),
})
}
(*variables)[block.Labels[0]] = res
return diags
}
// Prefix your environment variables with VarEnvPrefix so that Packer can see
// them.
const VarEnvPrefix = "PKR_VAR_"
func (variables Variables) collectVariableValues(env []string, files []*hcl.File, argv map[string]string) hcl.Diagnostics {
var diags hcl.Diagnostics
for _, raw := range env {
if !strings.HasPrefix(raw, VarEnvPrefix) {
continue
}
raw = raw[len(VarEnvPrefix):] // trim the prefix
eq := strings.Index(raw, "=")
if eq == -1 {
// Seems invalid, so we'll ignore it.
continue
}
name := raw[:eq]
value := raw[eq+1:]
variable, found := variables[name]
if !found {
// this variable was not defined in the hcl files, let's skip it !
continue
}
fakeFilename := fmt.Sprintf("<value for var.%s from env>", name)
expr, moreDiags := hclsyntax.ParseExpression([]byte(value), fakeFilename, hcl.Pos{Line: 1, Column: 1})
diags = append(diags, moreDiags...)
if moreDiags.HasErrors() {
continue
}
val, valDiags := expr.Value(nil)
diags = append(diags, valDiags...)
if variable.Type != cty.NilType {
var err error
val, err = convert.Convert(val, variable.Type)
if err != nil {
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Invalid value for variable",
Detail: fmt.Sprintf("The value for %s is not compatible with the variable's type constraint: %s.", name, err),
Subject: expr.Range().Ptr(),
})
val = cty.DynamicVal
}
}
variable.EnvValue = val
}
// files will contain files found in the folder then files passed as
// arguments.
for _, file := range files {
// Before we do our real decode, we'll probe to see if there are any
// blocks of type "variable" in this body, since it's a common mistake
// for new users to put variable declarations in pkrvars rather than
// variable value definitions, and otherwise our error message for that
// case is not so helpful.
{
content, _, _ := file.Body.PartialContent(&hcl.BodySchema{
Blocks: []hcl.BlockHeaderSchema{
{
Type: "variable",
LabelNames: []string{"name"},
},
},
})
for _, block := range content.Blocks {
name := block.Labels[0]
diags = diags.Append(&hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Variable declaration in a .pkrvar file",
Detail: fmt.Sprintf("A .pkrvar file is used to assign "+
"values to variables that have already been declared "+
"in .pkr files, not to declare new variables. To "+
"declare variable %q, place this block in one of your"+
" .pkr files,such as variables.pkr.hcl\n\nTo set a "+
"value for this variable in %s, use the definition "+
"syntax instead:\n %s = <value>",
name, block.TypeRange.Filename, name),
Subject: &block.TypeRange,
})
}
if diags.HasErrors() {
// If we already found problems then JustAttributes below will find
// the same problems with less-helpful messages, so we'll bail for
// now to let the user focus on the immediate problem.
return diags
}
}
attrs, moreDiags := file.Body.JustAttributes()
diags = append(diags, moreDiags...)
for name, attr := range attrs {
variable, found := variables[name]
if !found {
// No file defines this variable; let's skip it
continue
}
val, moreDiags := attr.Expr.Value(nil)
diags = append(diags, moreDiags...)
if variable.Type != cty.NilType {
var err error
val, err = convert.Convert(val, variable.Type)
if err != nil {
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Invalid value for variable",
Detail: fmt.Sprintf("The value for %s is not compatible with the variable's type constraint: %s.", name, err),
Subject: attr.Expr.Range().Ptr(),
})
val = cty.DynamicVal
}
}
variable.VarfileValue = val
}
}
// Finally we process values given explicitly on the command line.
for name, value := range argv {
variable, found := variables[name]
if !found {
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagWarning,
Summary: "Unknown -var variable",
Detail: fmt.Sprintf("A %q variable was passed in the command "+
"line but was not found in known variables."+
"To declare variable %q, place this block in one of your"+
" .pkr files,such as variables.pkr.hcl",
name, name),
})
continue
}
fakeFilename := fmt.Sprintf("<value for var.%s from arguments>", name)
expr, moreDiags := hclsyntax.ParseExpression([]byte(value), fakeFilename, hcl.Pos{Line: 1, Column: 1})
diags = append(diags, moreDiags...)
if moreDiags.HasErrors() {
continue
}
val, valDiags := expr.Value(nil)
diags = append(diags, valDiags...)
if variable.Type != cty.NilType {
var err error
val, err = convert.Convert(val, variable.Type)
if err != nil {
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Invalid argument value for -var variable",
Detail: fmt.Sprintf("The received arg value for %s is not compatible with the variable's type constraint: %s.", name, err),
Subject: expr.Range().Ptr(),
})
val = cty.DynamicVal
}
}
variable.CmdValue = val
}
return diags
}