Backports

buildmodule.go

@@ -18,8 +18,10 @@ package libpak
 
 import (
 	"fmt"
+	"net/url"
 	"os"
 	"reflect"
+	"runtime"
 	"sort"
 	"strconv"
 	"strings"
@@ -501,6 +503,15 @@ func (d *DependencyResolver) Resolve(id string, version string) (BuildModuleDepe
 			return BuildModuleDependency{}, fmt.Errorf("unable to parse version %s\n%w", c.Version, err)
 		}
 
+		// filter out deps that do not match the current running architecture
+		arch, err := archFromPURL(c.PURL)
+		if err != nil {
+			return BuildModuleDependency{}, fmt.Errorf("unable to compare arch\n%w", err)
+		}
+		if arch != archFromSystem() {
+			continue
+		}
+
 		if c.ID == id && vc.Check(v) && d.contains(c.Stacks, d.StackID) {
 			candidates = append(candidates, c)
 		}
@@ -529,6 +540,33 @@ func (d *DependencyResolver) Resolve(id string, version string) (BuildModuleDepe
 	return candidate, nil
 }
 
+func archFromPURL(rawPURL string) (string, error) {
+	if len(strings.TrimSpace(rawPURL)) == 0 {
+		return "amd64", nil
+	}
+
+	purl, err := url.Parse(rawPURL)
+	if err != nil {
+		return "", fmt.Errorf("unable to parse PURL\n%w", err)
+	}
+
+	queryParams := purl.Query()
+	if arch, ok := queryParams["arch"]; ok {
+		return arch[0], nil
+	}
+
+	return archFromSystem(), nil
+}
+
+func archFromSystem() string {
+	archFromEnv, ok := os.LookupEnv("BP_ARCH")
+	if !ok {
+		archFromEnv = runtime.GOARCH
+	}
+
+	return archFromEnv
+}
+
 func (DependencyResolver) contains(candidates []string, value string) bool {
 	if len(candidates) == 0 {
 		return true

buildmodule_test.go

@@ -283,6 +283,10 @@ func testBuildpack(t *testing.T, context spec.G, it spec.S) {
 			resolver libpak.DependencyResolver
 		)
 
+		it.Before(func() {
+			t.Setenv("BP_ARCH", "amd64") // force for test consistency
+		})
+
 		context("Resolve", func() {
 			it("filters by id", func() {
 				resolver.Dependencies = []libpak.BuildModuleDependency{
@@ -315,6 +319,69 @@ func testBuildpack(t *testing.T, context spec.G, it spec.S) {
 				}))
 			})
 
+			it("filters by arch", func() {
+				resolver.Dependencies = []libpak.BuildModuleDependency{
+					{
+						ID:      "test-id-1",
+						Name:    "test-name",
+						Version: "1.0",
+						URI:     "test-uri-amd64",
+						SHA256:  "test-sha256",
+						Stacks:  []string{"test-stack-1", "test-stack-2"},
+						PURL:    "pkg:generic/bellsoft-jdk@8.0.382?arch=amd64",
+					},
+					{
+						ID:      "test-id-1",
+						Name:    "test-name",
+						Version: "1.0",
+						URI:     "test-uri-arm64",
+						SHA256:  "test-sha256",
+						Stacks:  []string{"test-stack-1", "test-stack-2"},
+						PURL:    "pkg:generic/bellsoft-jdk@8.0.382?arch=arm64",
+					},
+				}
+				resolver.StackID = "test-stack-1"
+
+				t.Setenv("BP_ARCH", "arm64")
+
+				Expect(resolver.Resolve("test-id-1", "1.0")).To(Equal(libpak.BuildModuleDependency{
+					ID:      "test-id-1",
+					Name:    "test-name",
+					Version: "1.0",
+					URI:     "test-uri-arm64",
+					SHA256:  "test-sha256",
+					Stacks:  []string{"test-stack-1", "test-stack-2"},
+					PURL:    "pkg:generic/bellsoft-jdk@8.0.382?arch=arm64",
+				}))
+			})
+
+			it("filters by arch where arch should match any", func() {
+				resolver.Dependencies = []libpak.BuildModuleDependency{
+					{
+						ID:      "test-id-1",
+						Name:    "test-name",
+						Version: "1.0",
+						URI:     "test-uri",
+						SHA256:  "test-sha256",
+						Stacks:  []string{"test-stack-1", "test-stack-2"},
+						PURL:    "pkg:generic/spring-cloud-bindings@1.2.3",
+					},
+				}
+				resolver.StackID = "test-stack-1"
+
+				t.Setenv("BP_ARCH", "arm64")
+
+				Expect(resolver.Resolve("test-id-1", "1.0")).To(Equal(libpak.BuildModuleDependency{
+					ID:      "test-id-1",
+					Name:    "test-name",
+					Version: "1.0",
+					URI:     "test-uri",
+					SHA256:  "test-sha256",
+					Stacks:  []string{"test-stack-1", "test-stack-2"},
+					PURL:    "pkg:generic/spring-cloud-bindings@1.2.3",
+				}))
+			})
+
 			it("filters by version constraint", func() {
 				resolver.Dependencies = []libpak.BuildModuleDependency{
 					{

crush/crush.go

@@ -103,6 +103,84 @@ func CreateTarGz(destination io.Writer, source string) error {
 	return CreateTar(gz, source)
 }
 
+// CreateJar heavily inspired by: https://gosamples.dev/zip-file/
+// Be aware that this function does not create a MANIFEST.MF file, not does it strictly enforce jar format
+// in regard to elements that need to be STORE'd versus other that need to be DEFLATE'd; here everything is STORE'd
+// Finally, source path must end with a trailing "/"
+func CreateJar(source, target string) error {
+	// 1. Create a ZIP file and zip.Writer
+	f, err := os.Create(target)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	writer := zip.NewWriter(f)
+	defer writer.Close()
+
+	// 2. Go through all the files of the source
+	return filepath.Walk(source, func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+		absolutePath := ""
+
+		if info.Mode()&os.ModeSymlink == os.ModeSymlink {
+			if absolutePath, err = filepath.EvalSymlinks(path); err != nil {
+				return fmt.Errorf("unable to eval symlink %s\n%w", absolutePath, err)
+			}
+			if file, err := os.Open(absolutePath); err != nil {
+				return fmt.Errorf("unable to open %s\n%w", absolutePath, err)
+			} else {
+				if info, err = file.Stat(); err != nil {
+					return fmt.Errorf("unable to stat %s\n%w", absolutePath, err)
+				}
+			}
+		}
+
+		// 3. Create a local file header
+		header, err := zip.FileInfoHeader(info)
+		if err != nil {
+			return err
+		}
+
+		// set compression
+		header.Method = zip.Store
+		// 4. Set relative path of a file as the header name
+		header.Name, err = filepath.Rel(source, path)
+		if err != nil {
+			return err
+		}
+		if info.IsDir() {
+			header.Name += "/"
+		}
+
+		// 5. Create writer for the file header and save content of the file
+		headerWriter, err := writer.CreateHeader(header)
+		if err != nil {
+			return err
+		}
+
+		if info.IsDir() {
+			return nil
+		}
+
+		if absolutePath != "" {
+			path = absolutePath
+		}
+
+		f, err := os.Open(path)
+		if err != nil {
+			return err
+		}
+		defer f.Close()
+
+		_, err = io.Copy(headerWriter, f)
+		writer.Flush()
+		return err
+	})
+}
+
 // Extract decompresses and extract source files to a destination directory or path. For archives, an arbitrary number of top-level directory
 // components can be stripped from each path.
 func Extract(source io.Reader, destination string, stripComponents int) error {

crush/crush_test.go

@@ -96,6 +96,32 @@ func testCrush(t *testing.T, context spec.G, it spec.S) {
 			Expect(filepath.Join(testPath, "dirA", "fileC.txt")).To(BeARegularFile())
 			Expect(os.Readlink(filepath.Join(testPath, "dirA", "fileD.txt"))).To(Equal(filepath.Join(path, "dirA", "fileC.txt")))
 		})
+
+		it("writes a JAR", func() {
+			cwd, _ := os.Getwd()
+			Expect(os.MkdirAll(filepath.Join(path, "META-INF"), 0700)).To(Succeed())
+			Expect(os.WriteFile(filepath.Join(path, "META-INF", "MANIFEST.MF"), []byte(`
+	Spring-Boot-Version: 3.3.1
+	Spring-Boot-Classes: BOOT-INF/classes
+	Spring-Boot-Lib: BOOT-INF/lib
+	`), 0600)).To(Succeed())
+			Expect(os.MkdirAll(filepath.Join(path, "BOOT-INF"), 0700)).To(Succeed())
+			Expect(os.MkdirAll(filepath.Join(path, "BOOT-INF", "classes"), 0700)).To(Succeed())
+			Expect(os.WriteFile(filepath.Join(path, "BOOT-INF", "classes", "OtherClass.class"), []byte(""), 0600)).To(Succeed())
+			Expect(os.WriteFile(filepath.Join(path, "BOOT-INF", "classes", "YetOther.class"), []byte(""), 0600)).To(Succeed())
+			Expect(os.MkdirAll(filepath.Join(path, "BOOT-INF", "lib"), 0700)).To(Succeed())
+			os.Symlink(filepath.Join(cwd, "testdata", "test-archive.jar"), filepath.Join(path, "BOOT-INF", "lib", "test-archive.jar"))
+
+			Expect(crush.CreateJar(path+"/", out.Name()+".jar")).To(Succeed())
+
+			in, err := os.Open(out.Name() + ".jar")
+			Expect(err).NotTo(HaveOccurred())
+
+			Expect(crush.Extract(in, testPath, 0)).To(Succeed())
+			Expect(filepath.Join(testPath, "BOOT-INF", "classes", "OtherClass.class")).To(BeARegularFile())
+			Expect(filepath.Join(testPath, "META-INF", "MANIFEST.MF")).To(BeARegularFile())
+			Expect(filepath.Join(testPath, "BOOT-INF", "lib", "test-archive.jar")).To(BeARegularFile())
+		})
 	})
 
 	context("Extract", func() {