From 0dee97e338352491ef58fe519acbe2858bba5d45 Mon Sep 17 00:00:00 2001
From: Karl Trygve Kalleberg <karltk@boblycat.org>
Date: Mon, 3 Apr 2023 10:47:53 +0200
Subject: [PATCH] Expose tar_path command line option from Kaniko (#78)

---
 cmd/kaniko-docker/main.go |  6 ++++++
 kaniko.go                 | 10 ++++++++--
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/cmd/kaniko-docker/main.go b/cmd/kaniko-docker/main.go
index e41b2f1..a0511da 100644
--- a/cmd/kaniko-docker/main.go
+++ b/cmd/kaniko-docker/main.go
@@ -176,6 +176,11 @@ func main() {
 			Usage:  "Set this flag if you only want to build the image, without pushing to a registry",
 			EnvVar: "PLUGIN_NO_PUSH",
 		},
+		cli.StringFlag{
+			Name:   "tar-path",
+			Usage:  "Set this flag to save the image as a tarball at path",
+			EnvVar: "PLUGIN_TAR_PATH",
+		},
 		cli.StringFlag{
 			Name:   "verbosity",
 			Usage:  "Set this flag with value as oneof <panic|fatal|error|warn|info|debug|trace> to set the logging level for kaniko. Defaults to info.",
@@ -242,6 +247,7 @@ func run(c *cli.Context) error {
 			CacheTTL:         c.Int("cache-ttl"),
 			DigestFile:       defaultDigestFile,
 			NoPush:           noPush,
+			TarPath:          c.String("tar-path"),
 			Verbosity:        c.String("verbosity"),
 			Platform:         c.String("platform"),
 			SkipUnusedStages: c.Bool("skip-unused-stages"),
diff --git a/kaniko.go b/kaniko.go
index f5df59e..62d324c 100644
--- a/kaniko.go
+++ b/kaniko.go
@@ -39,6 +39,7 @@ type (
 		Verbosity        string   // Log level
 		Platform         string   // Allows to build with another default platform than the host, similarly to docker build --platform
 		SkipUnusedStages bool     // Build only used stages
+		TarPath          string   // Set this flag to save the image as a tarball at path
 	}
 
 	// Artifact defines content of artifact file
@@ -155,14 +156,15 @@ func (p Plugin) Exec() error {
 		fmt.Sprintf("--context=dir://%s", p.Build.Context),
 	}
 
-	// Set the destination repository
-	if !p.Build.NoPush {
+	// Set the destination repository only when we push or save to tarball
+	if !p.Build.NoPush || p.Build.TarPath != "" {
 		for _, tag := range tags {
 			for _, label := range p.Build.labelsForTag(tag) {
 				cmdArgs = append(cmdArgs, fmt.Sprintf("--destination=%s:%s", p.Build.Repo, label))
 			}
 		}
 	}
+
 	// Set the build arguments
 	for _, arg := range p.Build.Args {
 		cmdArgs = append(cmdArgs, fmt.Sprintf("--build-arg=%s", arg))
@@ -219,6 +221,10 @@ func (p Plugin) Exec() error {
 		cmdArgs = append(cmdArgs, "--skip-unused-stages")
 	}
 
+	if p.Build.TarPath != "" {
+		cmdArgs = append(cmdArgs, fmt.Sprintf("--tar-path=%s", p.Build.TarPath))
+	}
+	
 	cmd := exec.Command("/kaniko/executor", cmdArgs...)
 	cmd.Stdout = os.Stdout
 	cmd.Stderr = os.Stderr