command/apply: Remove implicit init call

The positional argument passed to apply was once used to specify a
source for a Terraform module to fetch and initialize (#337). This
functionality was removed from the init command later (#15032) but not
completely removed from apply.

This code was non-functional but largely not harmful, except for a very
specific case: when passing an absolute path to a plan file as the
positional argument on Windows, the getter.Detect code would incorrectly
interpret the path as a URL. This caused init to fail and the apply
command would exit with code 1 but without diagnostics.

This commit removes this codepath, which fixes this bug, and should
otherwise have no effect on the supported behaviour of apply.

Author: alisdair

command/apply.go

@@ -3,11 +3,9 @@ package command
 import (
 	"bytes"
 	"fmt"
-	"os"
 	"sort"
 	"strings"
 
-	"github.com/hashicorp/go-getter"
 	"github.com/hashicorp/terraform/addrs"
 	"github.com/hashicorp/terraform/backend"
 	"github.com/hashicorp/terraform/configs/hcl2shim"
@@ -53,11 +51,7 @@ func (c *ApplyCommand) Run(args []string) int {
 
 	var diags tfdiags.Diagnostics
 
-	// Get the args. The "maybeInit" flag tracks whether we may need to
-	// initialize the configuration from a remote path. This is true as long
-	// as we have an argument.
 	args = cmdFlags.Args()
-	maybeInit := len(args) == 1
 	configPath, err := ModulePath(args)
 	if err != nil {
 		c.Ui.Error(err.Error())
@@ -70,32 +64,6 @@ func (c *ApplyCommand) Run(args []string) int {
 		return 1
 	}
 
-	if !c.Destroy && maybeInit {
-		// We need the pwd for the getter operation below
-		pwd, err := os.Getwd()
-		if err != nil {
-			c.Ui.Error(fmt.Sprintf("Error getting pwd: %s", err))
-			return 1
-		}
-
-		// Do a detect to determine if we need to do an init + apply.
-		if detected, err := getter.Detect(configPath, pwd, getter.Detectors); err != nil {
-			c.Ui.Error(fmt.Sprintf("Invalid path: %s", err))
-			return 1
-		} else if !strings.HasPrefix(detected, "file") {
-			// If this isn't a file URL then we're doing an init +
-			// apply.
-			var init InitCommand
-			init.Meta = c.Meta
-			if code := init.Run([]string{detected}); code != 0 {
-				return code
-			}
-
-			// Change the config path to be the cwd
-			configPath = pwd
-		}
-	}
-
 	// Check if the path is a plan
 	planFile, err := c.PlanFile(configPath)
 	if err != nil {