mirror of
https://github.com/opentofu/opentofu.git
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269 lines
8.5 KiB
Go
269 lines
8.5 KiB
Go
// Copyright (c) HashiCorp, Inc.
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// SPDX-License-Identifier: MPL-2.0
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package command
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import (
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"fmt"
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"os"
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"strings"
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"github.com/hashicorp/hcl/v2"
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"github.com/hashicorp/hcl/v2/hclsyntax"
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hcljson "github.com/hashicorp/hcl/v2/json"
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"github.com/opentofu/opentofu/internal/backend"
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"github.com/opentofu/opentofu/internal/configs"
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"github.com/opentofu/opentofu/internal/opentf"
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"github.com/opentofu/opentofu/internal/tfdiags"
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)
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// VarEnvPrefix is the prefix for environment variables that represent values
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// for root module input variables.
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const VarEnvPrefix = "TF_VAR_"
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// collectVariableValues inspects the various places that root module input variable
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// values can come from and constructs a map ready to be passed to the
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// backend as part of a backend.Operation.
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//
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// This method returns diagnostics relating to the collection of the values,
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// but the values themselves may produce additional diagnostics when finally
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// parsed.
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func (m *Meta) collectVariableValues() (map[string]backend.UnparsedVariableValue, tfdiags.Diagnostics) {
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var diags tfdiags.Diagnostics
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ret := map[string]backend.UnparsedVariableValue{}
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// First we'll deal with environment variables, since they have the lowest
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// precedence.
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{
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env := os.Environ()
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for _, raw := range env {
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if !strings.HasPrefix(raw, VarEnvPrefix) {
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continue
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}
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raw = raw[len(VarEnvPrefix):] // trim the prefix
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eq := strings.Index(raw, "=")
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if eq == -1 {
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// Seems invalid, so we'll ignore it.
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continue
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}
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name := raw[:eq]
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rawVal := raw[eq+1:]
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ret[name] = unparsedVariableValueString{
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str: rawVal,
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name: name,
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sourceType: opentf.ValueFromEnvVar,
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}
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}
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}
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// Next up we have some implicit files that are loaded automatically
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// if they are present. There's the original terraform.tfvars
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// (DefaultVarsFilename) along with the later-added search for all files
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// ending in .auto.tfvars.
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if _, err := os.Stat(DefaultVarsFilename); err == nil {
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moreDiags := m.addVarsFromFile(DefaultVarsFilename, opentf.ValueFromAutoFile, ret)
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diags = diags.Append(moreDiags)
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}
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const defaultVarsFilenameJSON = DefaultVarsFilename + ".json"
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if _, err := os.Stat(defaultVarsFilenameJSON); err == nil {
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moreDiags := m.addVarsFromFile(defaultVarsFilenameJSON, opentf.ValueFromAutoFile, ret)
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diags = diags.Append(moreDiags)
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}
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if infos, err := os.ReadDir("."); err == nil {
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// "infos" is already sorted by name, so we just need to filter it here.
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for _, info := range infos {
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name := info.Name()
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if !isAutoVarFile(name) {
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continue
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}
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moreDiags := m.addVarsFromFile(name, opentf.ValueFromAutoFile, ret)
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diags = diags.Append(moreDiags)
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}
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}
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// Finally we process values given explicitly on the command line, either
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// as individual literal settings or as additional files to read.
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for _, rawFlag := range m.variableArgs.AllItems() {
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switch rawFlag.Name {
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case "-var":
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// Value should be in the form "name=value", where value is a
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// raw string whose interpretation will depend on the variable's
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// parsing mode.
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raw := rawFlag.Value
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eq := strings.Index(raw, "=")
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if eq == -1 {
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diags = diags.Append(tfdiags.Sourceless(
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tfdiags.Error,
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"Invalid -var option",
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fmt.Sprintf("The given -var option %q is not correctly specified. Must be a variable name and value separated by an equals sign, like -var=\"key=value\".", raw),
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))
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continue
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}
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name := raw[:eq]
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rawVal := raw[eq+1:]
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if strings.HasSuffix(name, " ") {
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diags = diags.Append(tfdiags.Sourceless(
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tfdiags.Error,
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"Invalid -var option",
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fmt.Sprintf("Variable name %q is invalid due to trailing space. Did you mean -var=\"%s=%s\"?", name, strings.TrimSuffix(name, " "), strings.TrimPrefix(rawVal, " ")),
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))
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continue
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}
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ret[name] = unparsedVariableValueString{
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str: rawVal,
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name: name,
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sourceType: opentf.ValueFromCLIArg,
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}
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case "-var-file":
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moreDiags := m.addVarsFromFile(rawFlag.Value, opentf.ValueFromNamedFile, ret)
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diags = diags.Append(moreDiags)
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default:
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// Should never happen; always a bug in the code that built up
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// the contents of m.variableArgs.
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diags = diags.Append(fmt.Errorf("unsupported variable option name %q (this is a bug in OpenTF)", rawFlag.Name))
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}
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}
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return ret, diags
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}
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func (m *Meta) addVarsFromFile(filename string, sourceType opentf.ValueSourceType, to map[string]backend.UnparsedVariableValue) tfdiags.Diagnostics {
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var diags tfdiags.Diagnostics
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src, err := os.ReadFile(filename)
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if err != nil {
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if os.IsNotExist(err) {
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diags = diags.Append(tfdiags.Sourceless(
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tfdiags.Error,
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"Failed to read variables file",
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fmt.Sprintf("Given variables file %s does not exist.", filename),
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))
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} else {
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diags = diags.Append(tfdiags.Sourceless(
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tfdiags.Error,
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"Failed to read variables file",
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fmt.Sprintf("Error while reading %s: %s.", filename, err),
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))
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}
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return diags
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}
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loader, err := m.initConfigLoader()
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if err != nil {
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diags = diags.Append(err)
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return diags
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}
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// Record the file source code for snippets in diagnostic messages.
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loader.Parser().ForceFileSource(filename, src)
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var f *hcl.File
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if strings.HasSuffix(filename, ".json") {
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var hclDiags hcl.Diagnostics
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f, hclDiags = hcljson.Parse(src, filename)
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diags = diags.Append(hclDiags)
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if f == nil || f.Body == nil {
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return diags
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}
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} else {
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var hclDiags hcl.Diagnostics
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f, hclDiags = hclsyntax.ParseConfig(src, filename, hcl.Pos{Line: 1, Column: 1})
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diags = diags.Append(hclDiags)
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if f == nil || f.Body == nil {
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return diags
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}
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}
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// Before we do our real decode, we'll probe to see if there are any blocks
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// of type "variable" in this body, since it's a common mistake for new
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// users to put variable declarations in tfvars rather than variable value
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// definitions, and otherwise our error message for that case is not so
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// helpful.
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{
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content, _, _ := f.Body.PartialContent(&hcl.BodySchema{
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Blocks: []hcl.BlockHeaderSchema{
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{
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Type: "variable",
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LabelNames: []string{"name"},
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},
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},
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})
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for _, block := range content.Blocks {
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name := block.Labels[0]
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diags = diags.Append(&hcl.Diagnostic{
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Severity: hcl.DiagError,
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Summary: "Variable declaration in .tfvars file",
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Detail: fmt.Sprintf("A .tfvars file is used to assign values to variables that have already been declared in .tf files, not to declare new variables. To declare variable %q, place this block in one of your .tf files, such as variables.tf.\n\nTo set a value for this variable in %s, use the definition syntax instead:\n %s = <value>", name, block.TypeRange.Filename, name),
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Subject: &block.TypeRange,
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})
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}
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if diags.HasErrors() {
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// If we already found problems then JustAttributes below will find
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// the same problems with less-helpful messages, so we'll bail for
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// now to let the user focus on the immediate problem.
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return diags
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}
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}
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attrs, hclDiags := f.Body.JustAttributes()
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diags = diags.Append(hclDiags)
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for name, attr := range attrs {
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to[name] = unparsedVariableValueExpression{
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expr: attr.Expr,
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sourceType: sourceType,
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}
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}
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return diags
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}
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// unparsedVariableValueLiteral is a backend.UnparsedVariableValue
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// implementation that was actually already parsed (!). This is
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// intended to deal with expressions inside "tfvars" files.
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type unparsedVariableValueExpression struct {
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expr hcl.Expression
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sourceType opentf.ValueSourceType
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}
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func (v unparsedVariableValueExpression) ParseVariableValue(mode configs.VariableParsingMode) (*opentf.InputValue, tfdiags.Diagnostics) {
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var diags tfdiags.Diagnostics
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val, hclDiags := v.expr.Value(nil) // nil because no function calls or variable references are allowed here
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diags = diags.Append(hclDiags)
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rng := tfdiags.SourceRangeFromHCL(v.expr.Range())
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return &opentf.InputValue{
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Value: val,
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SourceType: v.sourceType,
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SourceRange: rng,
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}, diags
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}
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// unparsedVariableValueString is a backend.UnparsedVariableValue
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// implementation that parses its value from a string. This can be used
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// to deal with values given directly on the command line and via environment
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// variables.
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type unparsedVariableValueString struct {
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str string
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name string
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sourceType opentf.ValueSourceType
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}
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func (v unparsedVariableValueString) ParseVariableValue(mode configs.VariableParsingMode) (*opentf.InputValue, tfdiags.Diagnostics) {
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var diags tfdiags.Diagnostics
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val, hclDiags := mode.Parse(v.name, v.str)
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diags = diags.Append(hclDiags)
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return &opentf.InputValue{
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Value: val,
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SourceType: v.sourceType,
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}, diags
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}
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