terraform/command/state_show.go

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package command
import (
"fmt"
"os"
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"strings"
"github.com/hashicorp/terraform/addrs"
"github.com/hashicorp/terraform/backend"
"github.com/hashicorp/terraform/command/format"
"github.com/hashicorp/terraform/states"
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"github.com/mitchellh/cli"
)
// StateShowCommand is a Command implementation that shows a single resource.
type StateShowCommand struct {
Meta
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StateMeta
}
func (c *StateShowCommand) Run(args []string) int {
args, err := c.Meta.process(args, true)
if err != nil {
return 1
}
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cmdFlags := c.Meta.defaultFlagSet("state show")
cmdFlags.StringVar(&c.Meta.statePath, "state", "", "path")
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if err := cmdFlags.Parse(args); err != nil {
c.Ui.Error(fmt.Sprintf("Error parsing command-line flags: %s\n", err.Error()))
return 1
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}
args = cmdFlags.Args()
if len(args) != 1 {
c.Ui.Error("Exactly one argument expected.\n")
return cli.RunResultHelp
}
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// Check for user-supplied plugin path
if c.pluginPath, err = c.loadPluginPath(); err != nil {
c.Ui.Error(fmt.Sprintf("Error loading plugin path: %s", err))
return 1
}
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// Load the backend
b, backendDiags := c.Backend(nil)
if backendDiags.HasErrors() {
c.showDiagnostics(backendDiags)
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return 1
}
// We require a local backend
local, ok := b.(backend.Local)
if !ok {
c.Ui.Error(ErrUnsupportedLocalOp)
return 1
}
// Check if the address can be parsed
addr, addrDiags := addrs.ParseAbsResourceInstanceStr(args[0])
if addrDiags.HasErrors() {
c.Ui.Error(fmt.Sprintf(errParsingAddress, args[0]))
return 1
}
// We expect the config dir to always be the cwd
cwd, err := os.Getwd()
if err != nil {
c.Ui.Error(fmt.Sprintf("Error getting cwd: %s", err))
return 1
}
// Build the operation (required to get the schemas)
opReq := c.Operation(b)
opReq.AllowUnsetVariables = true
opReq.ConfigDir = cwd
opReq.ConfigLoader, err = c.initConfigLoader()
if err != nil {
c.Ui.Error(fmt.Sprintf("Error initializing config loader: %s", err))
return 1
}
// Get the context (required to get the schemas)
ctx, _, ctxDiags := local.Context(opReq)
if ctxDiags.HasErrors() {
c.showDiagnostics(ctxDiags)
return 1
}
// Get the schemas from the context
schemas := ctx.Schemas()
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// Get the state
env := c.Workspace()
stateMgr, err := b.StateMgr(env)
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if err != nil {
c.Ui.Error(fmt.Sprintf(errStateLoadingState, err))
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return 1
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}
if err := stateMgr.RefreshState(); err != nil {
c.Ui.Error(fmt.Sprintf("Failed to refresh state: %s", err))
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return 1
}
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state := stateMgr.State()
if state == nil {
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c.Ui.Error(fmt.Sprintf(errStateNotFound))
return 1
}
is := state.ResourceInstance(addr)
if !is.HasCurrent() {
c.Ui.Error(errNoInstanceFound)
return 1
}
singleInstance := states.NewState()
singleInstance.EnsureModule(addr.Module).SetResourceInstanceCurrent(
addr.Resource,
is.Current,
Initial steps towards AbsProviderConfig/LocalProviderConfig separation (#23978) * Introduce "Local" terminology for non-absolute provider config addresses In a future change AbsProviderConfig and LocalProviderConfig are going to become two entirely distinct types, rather than Abs embedding Local as written here. This naming change is in preparation for that subsequent work, which will also include introducing a new "ProviderConfig" type that is an interface that AbsProviderConfig and LocalProviderConfig both implement. This is intended to be largely just a naming change to get started, so we can deal with all of the messy renaming. However, this did also require a slight change in modeling where the Resource.DefaultProviderConfig method has become Resource.DefaultProvider returning a Provider address directly, because this method doesn't have enough information to construct a true and accurate LocalProviderConfig -- it would need to refer to the configuration to know what this module is calling the provider it has selected. In order to leave a trail to follow for subsequent work, all of the changes here are intended to ensure that remaining work will become obvious via compile-time errors when all of the following changes happen: - The concept of "legacy" provider addresses is removed from the addrs package, including removing addrs.NewLegacyProvider and addrs.Provider.LegacyString. - addrs.AbsProviderConfig stops having addrs.LocalProviderConfig embedded in it and has an addrs.Provider and a string alias directly instead. - The provider-schema-handling parts of Terraform core are updated to work with addrs.Provider to identify providers, rather than legacy strings. In particular, there are still several codepaths here making legacy provider address assumptions (in order to limit the scope of this change) but I've made sure each one is doing something that relies on at least one of the above changes not having been made yet. * addrs: ProviderConfig interface In a (very) few special situations in the main "terraform" package we need to make runtime decisions about whether a provider config is absolute or local. We currently do that by exploiting the fact that AbsProviderConfig has LocalProviderConfig nested inside of it and so in the local case we can just ignore the wrapping AbsProviderConfig and use the embedded value. In a future change we'll be moving away from that embedding and making these two types distinct in order to represent that mapping between them requires consulting a lookup table in the configuration, and so here we introduce a new interface type ProviderConfig that can represent either AbsProviderConfig or LocalProviderConfig decided dynamically at runtime. This also includes the Config.ResolveAbsProviderAddr method that will eventually be responsible for that local-to-absolute translation, so that callers with access to the configuration can normalize to an addrs.AbsProviderConfig given a non-nil addrs.ProviderConfig. That's currently unused because existing callers are still relying on the simplistic structural transform, but we'll switch them over in a later commit. * rename LocalType to LocalName Co-authored-by: Kristin Laemmert <mildwonkey@users.noreply.github.com>
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addrs.NewDefaultLocalProviderConfig(addr.Resource.Resource.DefaultProvider().LegacyString()).Absolute(addr.Module),
)
output := format.State(&format.StateOpts{
State: singleInstance,
Color: c.Colorize(),
Schemas: schemas,
})
c.Ui.Output(output[strings.Index(output, "#"):])
return 0
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}
func (c *StateShowCommand) Help() string {
helpText := `
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Usage: terraform state show [options] ADDRESS
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Shows the attributes of a resource in the Terraform state.
This command shows the attributes of a single resource in the Terraform
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state. The address argument must be used to specify a single resource.
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You can view the list of available resources with "terraform state list".
Options:
-state=statefile Path to a Terraform state file to use to look
up Terraform-managed resources. By default it will
use the state "terraform.tfstate" if it exists.
`
return strings.TrimSpace(helpText)
}
func (c *StateShowCommand) Synopsis() string {
return "Show a resource in the state"
}
const errNoInstanceFound = `No instance found for the given address!
This command requires that the address references one specific instance.
To view the available instances, use "terraform state list". Please modify
the address to reference a specific instance.`
const errParsingAddress = `Error parsing instance address: %s
This command requires that the address references one specific instance.
To view the available instances, use "terraform state list". Please modify
the address to reference a specific instance.`