From a6cc96fbda7820bd741a08badca978577c33857c Mon Sep 17 00:00:00 2001
From: Robert Kaussow <mail@geeklabor.de>
Date: Wed, 16 Jun 2021 22:21:00 +0200
Subject: [PATCH] fix: allow multi-platform builds using --push flag (#29)

---
 plugin/docker.go | 7 ++++++-
 plugin/impl.go   | 4 ++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/plugin/docker.go b/plugin/docker.go
index d7900f4..8350d48 100644
--- a/plugin/docker.go
+++ b/plugin/docker.go
@@ -65,7 +65,6 @@ func commandBuild(build Build) *exec.Cmd {
 	args := []string{
 		"buildx",
 		"build",
-		"--load",
 		"--rm=true",
 		"-f", build.Dockerfile,
 		"-t", build.Name,
@@ -107,6 +106,12 @@ func commandBuild(build Build) *exec.Cmd {
 		args = append(args, "--quiet")
 	}
 
+	if len(build.Platforms.Value()) > 1 {
+		args = append(args, "--push")
+	} else {
+		args = append(args, "--load")
+	}
+
 	if len(build.Platforms.Value()) > 0 {
 		args = append(args, "--platform", strings.Join(build.Platforms.Value()[:], ","))
 	}
diff --git a/plugin/impl.go b/plugin/impl.go
index e8c249e..6e0464e 100644
--- a/plugin/impl.go
+++ b/plugin/impl.go
@@ -83,6 +83,10 @@ func (p *Plugin) Validate() error {
 	p.settings.Build.Ref = p.pipeline.Commit.Ref
 	p.settings.Daemon.Registry = p.settings.Login.Registry
 
+	if len(p.settings.Build.Platforms.Value()) > 1 && p.settings.Dryrun {
+		return fmt.Errorf("dryrun is not supported on multi-platform builds")
+	}
+
 	if p.settings.Build.TagsAuto {
 		// return true if tag event or default branch
 		if UseDefaultTag(