added handling for adding rpms to an image as well as the relevant tests

.gitignore

@@ -16,3 +16,6 @@
 
 # Go workspace file
 go.work
+
+# IDE
+.idea

pkg/build/build.go

@@ -3,6 +3,7 @@ package build
 import (
 	_ "embed"
 	"fmt"
+	"io"
 	"os"
 	"path/filepath"
 
@@ -48,6 +49,11 @@ func (b *Builder) Build() error {
 		return fmt.Errorf("generating combustion script: %w", err)
 	}
 
+	err = b.copyRPMs()
+	if err != nil {
+		return fmt.Errorf("copying RPMs over: %w", err)
+	}
+
 	switch b.imageConfig.Image.ImageType {
 	case config.ImageTypeISO:
 		err = b.buildIsoImage()
@@ -173,3 +179,24 @@ func (b *Builder) generateBaseImageFilename() string {
 	filename := filepath.Join(b.buildConfig.ImageConfigDir, "images", b.imageConfig.Image.BaseImage)
 	return filename
 }
+
+func copyFile(sourcePath string, destPath string) error {
+	sourceFile, err := os.Open(sourcePath)
+	if err != nil {
+		return fmt.Errorf("opening file from source path: %w", err)
+	}
+	defer sourceFile.Close()
+
+	destFile, err := os.Create(destPath)
+	if err != nil {
+		return fmt.Errorf("creating file at dest path: %w", err)
+	}
+	defer destFile.Close()
+
+	_, err = io.Copy(destFile, sourceFile)
+	if err != nil {
+		return fmt.Errorf("copying file from source path to dest path: %w", err)
+	}
+
+	return nil
+}

pkg/build/rpm.go

@@ -0,0 +1,58 @@
+package build
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+)
+
+func (b *Builder) getRPMFileNames(rpmSourceDir string) ([]string, error) {
+	var rpmFileNames []string
+
+	rpms, err := os.ReadDir(rpmSourceDir)
+	if err != nil {
+		return nil, fmt.Errorf("reading rpm source dir: %w", err)
+	}
+
+	for _, rpmFile := range rpms {
+		if filepath.Ext(rpmFile.Name()) == ".rpm" {
+			rpmFileNames = append(rpmFileNames, rpmFile.Name())
+		}
+	}
+
+	if len(rpmFileNames) == 0 {
+		return nil, fmt.Errorf("no rpms found")
+	}
+
+	return rpmFileNames, nil
+}
+
+func (b *Builder) copyRPMs() error {
+	rpmSourceDir := filepath.Join(b.buildConfig.ImageConfigDir, "rpms")
+	// Only proceed with copying the RPMs if the directory exists
+	_, err := os.Stat(rpmSourceDir)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return nil
+		}
+		return fmt.Errorf("checking for rpm directory at %s: %w", rpmSourceDir, err)
+	}
+	rpmDestDir := b.combustionDir
+
+	rpmFileNames, err := b.getRPMFileNames(rpmSourceDir)
+	if err != nil {
+		return fmt.Errorf("getting rpm file names: %w", err)
+	}
+
+	for _, rpm := range rpmFileNames {
+		sourcePath := filepath.Join(rpmSourceDir, rpm)
+		destPath := filepath.Join(rpmDestDir, rpm)
+
+		err = copyFile(sourcePath, destPath)
+		if err != nil {
+			return fmt.Errorf("copying file %s: %w", sourcePath, err)
+		}
+	}
+
+	return nil
+}

pkg/build/rpm_test.go

@@ -0,0 +1,125 @@
+package build
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"github.com/suse-edge/edge-image-builder/pkg/config"
+)
+
+func TestGetRPMFileNames(t *testing.T) {
+	// Setup
+	bc := config.BuildConfig{
+		ImageConfigDir: "../config/testdata",
+	}
+	builder := New(nil, &bc)
+	err := builder.prepareBuildDir()
+	require.NoError(t, err)
+	defer os.Remove(builder.eibBuildDir)
+
+	rpmSourceDir := filepath.Join(builder.buildConfig.ImageConfigDir, "rpms")
+
+	file1Path := filepath.Join(rpmSourceDir, "rpm1.rpm")
+	defer os.Remove(file1Path)
+	file1, err := os.Create(file1Path)
+	require.NoError(t, err)
+
+	file2Path := filepath.Join(rpmSourceDir, "rpm2.rpm")
+	defer os.Remove(file2Path)
+	file2, err := os.Create(file2Path)
+	require.NoError(t, err)
+
+	// Test
+	rpmFileNames, err := builder.getRPMFileNames(rpmSourceDir)
+
+	// Verify
+	require.NoError(t, err)
+
+	assert.Contains(t, rpmFileNames, "rpm1.rpm")
+	assert.Contains(t, rpmFileNames, "rpm2.rpm")
+
+	// Cleanup
+	assert.NoError(t, file1.Close())
+	assert.NoError(t, file2.Close())
+}
+
+func TestCopyRPMs(t *testing.T) {
+	// Setup
+	bc := config.BuildConfig{
+		ImageConfigDir: "../config/testdata",
+	}
+	builder := New(nil, &bc)
+	err := builder.prepareBuildDir()
+	require.NoError(t, err)
+	defer os.Remove(builder.eibBuildDir)
+
+	rpmSourceDir := filepath.Join(builder.buildConfig.ImageConfigDir, "rpms")
+	rpmDestDir := builder.combustionDir
+
+	file1Path := filepath.Join(rpmSourceDir, "rpm1.rpm")
+	defer os.Remove(file1Path)
+	file1, err := os.Create(file1Path)
+	require.NoError(t, err)
+
+	file2Path := filepath.Join(rpmSourceDir, "rpm2.rpm")
+	defer os.Remove(file2Path)
+	file2, err := os.Create(file2Path)
+	require.NoError(t, err)
+
+	// Test
+	err = builder.copyRPMs()
+
+	// Verify
+	require.NoError(t, err)
+
+	_, err = os.Stat(filepath.Join(rpmDestDir, "rpm1.rpm"))
+	require.NoError(t, err)
+
+	_, err = os.Stat(filepath.Join(rpmDestDir, "rpm2.rpm"))
+	require.NoError(t, err)
+
+	// Cleanup
+	assert.NoError(t, file1.Close())
+	assert.NoError(t, file2.Close())
+}
+
+func TestGetRPMFileNamesNoRPMs(t *testing.T) {
+	// Setup
+	bc := config.BuildConfig{
+		ImageConfigDir: "../config/testdata",
+	}
+	builder := New(nil, &bc)
+	err := builder.prepareBuildDir()
+	require.NoError(t, err)
+	defer os.Remove(builder.eibBuildDir)
+
+	rpmSourceDir := filepath.Join(builder.buildConfig.ImageConfigDir, "rpms")
+
+	// Test
+	rpmFileNames, err := builder.getRPMFileNames(rpmSourceDir)
+
+	// Verify
+	require.ErrorContains(t, err, "no rpms found")
+
+	assert.Empty(t, rpmFileNames)
+}
+
+func TestCopyRPMsNoRPMDir(t *testing.T) {
+	// Setup
+	bc := config.BuildConfig{
+		ImageConfigDir: "../config/ThisDirDoesNotExist",
+	}
+	builder := New(nil, &bc)
+	err := builder.prepareBuildDir()
+	require.NoError(t, err)
+	defer os.Remove(builder.eibBuildDir)
+
+	// Test
+	err = builder.copyRPMs()
+
+	// Verify
+	require.NoError(t, err)
+}