terraform/command/graph.go

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package command
import (
"fmt"
"strings"
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"github.com/hashicorp/terraform/plans"
"github.com/hashicorp/terraform/tfdiags"
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"github.com/hashicorp/terraform/backend"
"github.com/hashicorp/terraform/dag"
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"github.com/hashicorp/terraform/terraform"
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)
// GraphCommand is a Command implementation that takes a Terraform
// configuration and outputs the dependency tree in graphical form.
type GraphCommand struct {
Meta
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}
func (c *GraphCommand) Run(args []string) int {
var drawCycles bool
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var graphTypeStr string
var moduleDepth int
var verbose bool
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args = c.Meta.process(args)
cmdFlags := c.Meta.defaultFlagSet("graph")
cmdFlags.BoolVar(&drawCycles, "draw-cycles", false, "draw-cycles")
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cmdFlags.StringVar(&graphTypeStr, "type", "", "type")
cmdFlags.IntVar(&moduleDepth, "module-depth", -1, "module-depth")
cmdFlags.BoolVar(&verbose, "verbose", false, "verbose")
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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
}
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configPath, err := ModulePath(cmdFlags.Args())
if err != nil {
c.Ui.Error(err.Error())
return 1
}
// 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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// Check if the path is a plan
var plan *plans.Plan
planFile, err := c.PlanFile(configPath)
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if err != nil {
c.Ui.Error(err.Error())
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return 1
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}
if planFile != nil {
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// Reset for backend loading
configPath = ""
}
var diags tfdiags.Diagnostics
backendConfig, backendDiags := c.loadBackendConfig(configPath)
diags = diags.Append(backendDiags)
if diags.HasErrors() {
c.showDiagnostics(diags)
return 1
}
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// Load the backend
b, backendDiags := c.Backend(&BackendOpts{
Config: backendConfig,
})
diags = diags.Append(backendDiags)
if backendDiags.HasErrors() {
c.showDiagnostics(diags)
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return 1
}
// We require a local backend
local, ok := b.(backend.Local)
if !ok {
c.showDiagnostics(diags) // in case of any warnings in here
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c.Ui.Error(ErrUnsupportedLocalOp)
return 1
}
// Build the operation
opReq := c.Operation(b)
opReq.ConfigDir = configPath
opReq.ConfigLoader, err = c.initConfigLoader()
opReq.PlanFile = planFile
opReq.AllowUnsetVariables = true
if err != nil {
diags = diags.Append(err)
c.showDiagnostics(diags)
return 1
}
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// Get the context
ctx, _, ctxDiags := local.Context(opReq)
diags = diags.Append(ctxDiags)
if ctxDiags.HasErrors() {
c.showDiagnostics(diags)
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return 1
}
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// Determine the graph type
graphType := terraform.GraphTypePlan
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if plan != nil {
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graphType = terraform.GraphTypeApply
}
if graphTypeStr != "" {
v, ok := terraform.GraphTypeMap[graphTypeStr]
if !ok {
c.Ui.Error(fmt.Sprintf("Invalid graph type requested: %s", graphTypeStr))
return 1
}
graphType = v
}
// Skip validation during graph generation - we want to see the graph even if
// it is invalid for some reason.
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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g, graphDiags := ctx.Graph(graphType, &terraform.ContextGraphOpts{
Verbose: verbose,
Validate: false,
})
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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diags = diags.Append(graphDiags)
if graphDiags.HasErrors() {
c.showDiagnostics(diags)
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return 1
}
graphStr, err := terraform.GraphDot(g, &dag.DotOpts{
DrawCycles: drawCycles,
MaxDepth: moduleDepth,
Verbose: verbose,
})
if err != nil {
c.Ui.Error(fmt.Sprintf("Error converting graph: %s", err))
return 1
}
if diags.HasErrors() {
// For this command we only show diagnostics if there are errors,
// because printing out naked warnings could upset a naive program
// consuming our dot output.
c.showDiagnostics(diags)
return 1
}
c.Ui.Output(graphStr)
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return 0
}
func (c *GraphCommand) Help() string {
helpText := `
Usage: terraform graph [options] [DIR]
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Outputs the visual execution graph of Terraform resources according to
configuration files in DIR (or the current directory if omitted).
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The graph is outputted in DOT format. The typical program that can
read this format is GraphViz, but many web services are also available
to read this format.
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The -type flag can be used to control the type of graph shown. Terraform
creates different graphs for different operations. See the options below
for the list of types supported. The default type is "plan" if a
configuration is given, and "apply" if a plan file is passed as an
argument.
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Options:
-draw-cycles Highlight any cycles in the graph with colored edges.
This helps when diagnosing cycle errors.
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-type=plan Type of graph to output. Can be: plan, plan-destroy, apply,
validate, input, refresh.
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-module-depth=n (deprecated) In prior versions of Terraform, specified the
depth of modules to show in the output.
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`
return strings.TrimSpace(helpText)
}
func (c *GraphCommand) Synopsis() string {
return "Generate a Graphviz graph of the steps in an operation"
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}