debug: build unsupported platforms with a warning

Signed-off-by: Dan Luhring <dluhring@chainguard.dev>

pkg/build/gobuild.go

@@ -309,20 +309,18 @@ func getDelve(ctx context.Context, platform v1.Platform) (string, error) {
 	cloneDir := filepath.Join(tmpInstallDir, "delve")
 	err = os.MkdirAll(cloneDir, 0755)
 	if err != nil {
-		return "", fmt.Errorf("making dir for delve clone: %v", err)
+		return "", fmt.Errorf("making dir for delve clone: %w", err)
 	}
 	err = git.Clone(ctx, cloneDir, delveCloneURL)
 	if err != nil {
-		return "", fmt.Errorf("cloning delve repo: %v", err)
+		return "", fmt.Errorf("cloning delve repo: %w", err)
 	}
 	osArchDir := fmt.Sprintf("%s_%s", platform.OS, platform.Architecture)
 	delveBinaryPath := filepath.Join(tmpInstallDir, "bin", osArchDir, "dlv")
 
 	// install delve to tmp directory
 	args := []string{
 		"build",
-		"-C",
-		cloneDir,
 		"./cmd/dlv",
 		"-o",
 		delveBinaryPath,
@@ -331,6 +329,7 @@ func getDelve(ctx context.Context, platform v1.Platform) (string, error) {
 	gobin := getGoBinary()
 	cmd := exec.CommandContext(ctx, gobin, args...)
 	cmd.Env = env
+	cmd.Dir = cloneDir
 
 	var output bytes.Buffer
 	cmd.Stderr = &output
@@ -1003,6 +1002,7 @@ func (g *gobuild) buildOne(ctx context.Context, refStr string, base v1.Image, pl
 		}
 	}
 	if g.debug && !doesPlatformSupportDebugging(*platform) {
+		log.Printf("image for platform %q will be built without debugging enabled because debugging is not supported for that platform", *platform)
 		return nil, fmt.Errorf("debugging is not supported for %s", platform)
 	}
 
@@ -1116,7 +1116,7 @@ func (g *gobuild) buildOne(ctx context.Context, refStr string, base v1.Image, pl
 	})
 
 	delvePath := "" // path for delve in image
-	if g.debug {
+	if g.debug && doesPlatformSupportDebugging(*platform) {
 		// get delve locally
 		delveBinary, err := getDelve(ctx, *platform)
 		if err != nil {

pkg/internal/git/clone.go

@@ -1,3 +1,39 @@
+// Copyright 2024 ko Build Authors All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// MIT License
+//
+// Copyright (c) 2016-2022 Carlos Alexandro Becker
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
 package git
 
 import (
@@ -18,7 +54,7 @@ func Clone(ctx context.Context, dir string, repoURL string) error {
 
 	_, err := run(ctx, rc)
 	if err != nil {
-		return fmt.Errorf("running git clone: %v", err)
+		return fmt.Errorf("running git clone: %w", err)
 	}
 
 	return nil