terraform/command/output.go

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package command
import (
"encoding/json"
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"fmt"
"strings"
"github.com/zclconf/go-cty/cty"
"github.com/zclconf/go-cty/cty/convert"
ctyjson "github.com/zclconf/go-cty/cty/json"
terraform: ugly huge change to weave in new HCL2-oriented types Due to how deeply the configuration types go into Terraform Core, there isn't a great way to switch out to HCL2 gradually. As a consequence, this huge commit gets us from the old state to a _compilable_ new state, but does not yet attempt to fix any tests and has a number of known missing parts and bugs. We will continue to iterate on this in forthcoming commits, heading back towards passing tests and making Terraform fully-functional again. The three main goals here are: - Use the configuration models from the "configs" package instead of the older models in the "config" package, which is now deprecated and preserved only to help us write our migration tool. - Do expression inspection and evaluation using the functionality of the new "lang" package, instead of the Interpolator type and related functionality in the main "terraform" package. - Represent addresses of various objects using types in the addrs package, rather than hand-constructed strings. This is not critical to support the above, but was a big help during the implementation of these other points since it made it much more explicit what kind of address is expected in each context. Since our new packages are built to accommodate some future planned features that are not yet implemented (e.g. the "for_each" argument on resources, "count"/"for_each" on modules), and since there's still a fair amount of functionality still using old-style APIs, there is a moderate amount of shimming here to connect new assumptions with old, hopefully in a way that makes it easier to find and eliminate these shims later. I apologize in advance to the person who inevitably just found this huge commit while spelunking through the commit history.
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"github.com/hashicorp/terraform/repl"
"github.com/hashicorp/terraform/states"
"github.com/hashicorp/terraform/tfdiags"
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)
// OutputCommand is a Command implementation that reads an output
// from a Terraform state and prints it.
type OutputCommand struct {
Meta
// Unit tests may set rawPrint to capture the output from the -raw
// option, which would normally go to stdout directly.
rawPrint func(string)
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}
func (c *OutputCommand) Run(args []string) int {
args = c.Meta.process(args)
var statePath string
var jsonOutput, rawOutput bool
cmdFlags := c.Meta.defaultFlagSet("output")
cmdFlags.BoolVar(&jsonOutput, "json", false, "json")
cmdFlags.BoolVar(&rawOutput, "raw", false, "raw")
cmdFlags.StringVar(&statePath, "state", "", "path")
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cmdFlags.Usage = func() { c.Ui.Error(c.Help()) }
if err := cmdFlags.Parse(args); err != nil {
c.Ui.Error(fmt.Sprintf("Error parsing command-line flags: %s\n", err.Error()))
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return 1
}
args = cmdFlags.Args()
if len(args) > 1 {
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c.Ui.Error(
"The output command expects exactly one argument with the name\n" +
"of an output variable or no arguments to show all outputs.\n")
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cmdFlags.Usage()
return 1
}
if jsonOutput && rawOutput {
c.Ui.Error("The -raw and -json options are mutually-exclusive.\n")
cmdFlags.Usage()
return 1
}
if rawOutput && len(args) == 0 {
c.Ui.Error("You must give the name of a single output value when using the -raw option.\n")
cmdFlags.Usage()
return 1
}
name := ""
if len(args) > 0 {
name = args[0]
}
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if statePath != "" {
c.Meta.statePath = statePath
}
var diags tfdiags.Diagnostics
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// Load the backend
b, backendDiags := c.Backend(nil)
diags = diags.Append(backendDiags)
if backendDiags.HasErrors() {
c.showDiagnostics(diags)
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return 1
}
backend: Validate remote backend Terraform version When using the enhanced remote backend, a subset of all Terraform operations are supported. Of these, only plan and apply can be executed on the remote infrastructure (e.g. Terraform Cloud). Other operations run locally and use the remote backend for state storage. This causes problems when the local version of Terraform does not match the configured version from the remote workspace. If the two versions are incompatible, an `import` or `state mv` operation can cause the remote workspace to be unusable until a manual fix is applied. To prevent this from happening accidentally, this commit introduces a check that the local Terraform version and the configured remote workspace Terraform version are compatible. This check is skipped for commands which do not write state, and can also be disabled by the use of a new command-line flag, `-ignore-remote-version`. Terraform version compatibility is defined as: - For all releases before 0.14.0, local must exactly equal remote, as two different versions cannot share state; - 0.14.0 to 1.0.x are compatible, as we will not change the state version number until at least Terraform 1.1.0; - Versions after 1.1.0 must have the same major and minor versions, as we will not change the state version number in a patch release. If the two versions are incompatible, a diagnostic is displayed, advising that the error can be suppressed with `-ignore-remote-version`. When this flag is used, the diagnostic is still displayed, but as a warning instead of an error. Commands which will not write state can assert this fact by calling the helper `meta.ignoreRemoteBackendVersionConflict`, which will disable the checks. Those which can write state should instead call the helper `meta.remoteBackendVersionCheck`, which will return diagnostics for display. In addition to these explicit paths for managing the version check, we have an implicit check in the remote backend's state manager initialization method. Both of the above helpers will disable this check. This fallback is in place to ensure that future code paths which access state cannot accidentally skip the remote version check.
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// This is a read-only command
c.ignoreRemoteBackendVersionConflict(b)
env, err := c.Workspace()
if err != nil {
c.Ui.Error(fmt.Sprintf("Error selecting workspace: %s", err))
return 1
}
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// Get the state
stateStore, err := b.StateMgr(env)
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if err != nil {
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c.Ui.Error(fmt.Sprintf("Failed to load state: %s", err))
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return 1
}
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if err := stateStore.RefreshState(); err != nil {
c.Ui.Error(fmt.Sprintf("Failed to load state: %s", err))
return 1
}
state := stateStore.State()
if state == nil {
state = states.NewState()
}
mod := state.RootModule()
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if !jsonOutput && (state.Empty() || len(mod.OutputValues) == 0) {
diags = diags.Append(tfdiags.Sourceless(
tfdiags.Warning,
"No outputs found",
"The state file either has no outputs defined, or all the defined "+
"outputs are empty. Please define an output in your configuration "+
"with the `output` keyword and run `terraform refresh` for it to "+
"become available. If you are using interpolation, please verify "+
"the interpolated value is not empty. You can use the "+
"`terraform console` command to assist.",
))
c.showDiagnostics(diags)
return 0
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}
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if name == "" {
if jsonOutput {
// Due to a historical accident, the switch from state version 2 to
// 3 caused our JSON output here to be the full metadata about the
// outputs rather than just the output values themselves as we'd
// show in the single value case. We must now maintain that behavior
// for compatibility, so this is an emulation of the JSON
// serialization of outputs used in state format version 3.
type OutputMeta struct {
Sensitive bool `json:"sensitive"`
Type json.RawMessage `json:"type"`
Value json.RawMessage `json:"value"`
}
outputs := map[string]OutputMeta{}
for n, os := range mod.OutputValues {
jsonVal, err := ctyjson.Marshal(os.Value, os.Value.Type())
if err != nil {
diags = diags.Append(err)
c.showDiagnostics(diags)
return 1
}
jsonType, err := ctyjson.MarshalType(os.Value.Type())
if err != nil {
diags = diags.Append(err)
c.showDiagnostics(diags)
return 1
}
outputs[n] = OutputMeta{
Sensitive: os.Sensitive,
Type: json.RawMessage(jsonType),
Value: json.RawMessage(jsonVal),
}
}
jsonOutputs, err := json.MarshalIndent(outputs, "", " ")
if err != nil {
diags = diags.Append(err)
c.showDiagnostics(diags)
return 1
}
c.Ui.Output(string(jsonOutputs))
return 0
} else {
c.Ui.Output(outputsAsString(state, false))
return 0
}
}
os, ok := mod.OutputValues[name]
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if !ok {
c.Ui.Error(fmt.Sprintf(
"The output variable requested could not be found in the state\n" +
"file. If you recently added this to your configuration, be\n" +
"sure to run `terraform apply`, since the state won't be updated\n" +
"with new output variables until that command is run."))
return 1
}
v := os.Value
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switch {
case jsonOutput:
jsonOutput, err := ctyjson.Marshal(v, v.Type())
if err != nil {
return 1
}
c.Ui.Output(string(jsonOutput))
case rawOutput:
strV, err := convert.Convert(v, cty.String)
if err != nil {
diags = diags.Append(tfdiags.Sourceless(
tfdiags.Error,
"Unsupported value for raw output",
fmt.Sprintf(
"The -raw option only supports strings, numbers, and boolean values, but output value %q is %s.\n\nUse the -json option for machine-readable representations of output values that have complex types.",
name, v.Type().FriendlyName(),
),
))
c.showDiagnostics(diags)
return 1
}
if strV.IsNull() {
diags = diags.Append(tfdiags.Sourceless(
tfdiags.Error,
"Unsupported value for raw output",
fmt.Sprintf(
"The value for output value %q is null, so -raw mode cannot print it.",
name,
),
))
c.showDiagnostics(diags)
return 1
}
if !strV.IsKnown() {
// Since we're working with values from the state it would be very
// odd to end up in here, but we'll handle it anyway to avoid a
// panic in case our rules somehow change in future.
diags = diags.Append(tfdiags.Sourceless(
tfdiags.Error,
"Unsupported value for raw output",
fmt.Sprintf(
"The value for output value %q won't be known until after a successful terraform apply, so -raw mode cannot print it.",
name,
),
))
c.showDiagnostics(diags)
return 1
}
// If we get out here then we should have a valid string to print.
// We're writing it directly to the output here so that a shell caller
// will get exactly the value and no extra whitespace.
str := strV.AsString()
if c.rawPrint != nil {
c.rawPrint(str)
} else {
fmt.Print(str)
}
default:
result := repl.FormatValue(v, 0)
c.Ui.Output(result)
}
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return 0
}
func (c *OutputCommand) Help() string {
helpText := `
Usage: terraform output [options] [NAME]
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Reads an output variable from a Terraform state file and prints
the value. With no additional arguments, output will display all
the outputs for the root module. If NAME is not specified, all
outputs are printed.
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Options:
-state=path Path to the state file to read. Defaults to
"terraform.tfstate".
-no-color If specified, output won't contain any color.
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-json If specified, machine readable output will be
printed in JSON format.
-raw For value types that can be automatically
converted to a string, will print the raw
string directly, rather than a human-oriented
representation of the value.
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`
return strings.TrimSpace(helpText)
}
func (c *OutputCommand) Synopsis() string {
return "Show output values from your root module"
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}