Add temp dir cleanup on startup

Adding a reliable way of cleaning up the contents of temp and src dirs
to make sure they don't get piled up and grow in size with every restart

README.md

@@ -179,6 +179,8 @@ repositories:
 - `--git-ssh-known-hosts-file (GIT_SSH_KNOWN_HOSTS_FILE)` - (default: `/etc/git-secret/known_hosts`) The local path to the known hosts file used to setup GIT_SSH_COMMAND env.
 - `--git-verify-known-hosts (GIT_VERIFY_KNOWN_HOSTS)` - (default: `true`) The local path to the known hosts file used to setup GIT_SSH_COMMAND env.
 - `--controller-runtime-env (CONTROLLER_RUNTIME_ENV)` - (default: `""`) The comma separated list of ENVs which will be passed from controller to all terraform run process. The envs should be set on the controller.
+- `--cleanup-temp-dir` - (default: `false`) If set, the OS temporary directory will be removed and re-created. This can help removing redundant terraform binaries and avoiding temp directory growing in size with every restart.
+
 ---
 
 - `--module-label-selector (MODULE_LABEL_SELECTOR)` - (default: `""`) If present controller will only watch and process modules with this label.

main.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"io"
 	"os"
+	"os/exec"
 	"os/signal"
 	"path/filepath"
 	"strings"
@@ -151,7 +152,12 @@ var (
 			Usage: "The comma separated list of ENVs which will be passed from controller to its managed modules during terraform run. " +
 				"The values should be set on the controller.",
 		},
-
+		&cli.BoolFlag{
+			Name:  "cleanup-temp-dir",
+			Value: false,
+			Usage: "If set, the OS temporary directory will be removed and re-created. This can help removing redundant terraform" +
+				"binaries and avoiding temp directory growing in size with every restart.",
+		},
 		&cli.StringFlag{
 			Name:    "module-label-selector",
 			EnvVars: []string{"MODULE_LABEL_SELECTOR"},
@@ -368,6 +374,11 @@ func setupGlobalEnv(c *cli.Context) {
 		globalRunEnv[env] = os.Getenv(env)
 	}
 
+	// Cleanup temp directory if the corresponding flag is set
+	if c.Bool("cleanup-temp-dir") {
+		cleanupTmpDir()
+	}
+
 	if c.Bool("set-git-ssh-command-global-env") {
 		cmdStr, err := git.GitSSHCommand(
 			c.String("git-ssh-key-file"), c.String("git-ssh-known-hosts-file"), c.Bool("git-verify-known-hosts"),
@@ -411,6 +422,18 @@ preferences: {}
 
 }
 
+func cleanupTmpDir() {
+	tmpDir := os.TempDir()
+
+	tmpDirCleanupCommand := fmt.Sprintf("rm -rf %s/* %s/*", tmpDir, reposRootPath)
+
+	cmd := exec.Command("sh", "-c", tmpDirCleanupCommand)
+	err := cmd.Run()
+	if err != nil {
+		fmt.Printf("Error: %v\n", err)
+	}
+}
+
 func main() {
 	app := &cli.App{
 		Name: "terraform-applier",