added targets flag for buildpack new cli

internal/commands/buildpack_new.go

@@ -5,10 +5,13 @@
 	"fmt"
 	"os"
 	"path/filepath"
+	"runtime"
 	"strings"
 
 	"github.com/spf13/cobra"
 
+	"github.com/pkg/errors"
+
 	"github.com/buildpacks/pack/internal/style"
 	"github.com/buildpacks/pack/pkg/client"
 	"github.com/buildpacks/pack/pkg/dist"
@@ -17,9 +20,11 @@
 
 // BuildpackNewFlags define flags provided to the BuildpackNew command
 type BuildpackNewFlags struct {
-	API     string
-	Path    string
+	API  string
+	Path string
+	// Deprecated: Stacks are deprecated
 	Stacks  []string
+	Targets []string
 	Version string
 }
 
@@ -66,11 +71,46 @@
 				})
 			}
 
+			var targets []dist.Target
+			for _, t := range flags.Targets {
+				var distroMap []dist.Distribution
+				target, nonDistro, distros, err := getTarget(t)
+				if err != nil {
+					logger.Error(err.Error())
+				}
+				if i, e := getSliceAt[string](target, 1); e == nil {
+					distros = strings.Split(i, ";")
+				}
+				for _, d := range distros {
+					distro := strings.Split(d, "@")
+					if l := len(distro); l <= 0 {
+						return errors.Errorf("distro is nil!")
+					} else if l == 1 {
+						logger.Warnf("forgot to specify version for distro %s ?", distro[0])
+					}
+					distroMap = append(distroMap, dist.Distribution{
+						Name:     distro[0],
+						Versions: distro[1:],
+					})
+				}
+				os, arch, variant, err := getPlatform(nonDistro)
+				if err != nil {
+					return err
+				}
+				targets = append(targets, dist.Target{
+					OS:            os,
+					Arch:          arch,
+					ArchVariant:   variant,
+					Distributions: distroMap,
+				})
+			}
+
 			if err := creator.NewBuildpack(cmd.Context(), client.NewBuildpackOptions{
 				API:     flags.API,
 				ID:      id,
 				Path:    path,
 				Stacks:  stacks,
+				Targets: targets,
 				Version: flags.Version,
 			}); err != nil {
 				return err
@@ -84,8 +124,108 @@
 	cmd.Flags().StringVarP(&flags.API, "api", "a", "0.8", "Buildpack API compatibility of the generated buildpack")
 	cmd.Flags().StringVarP(&flags.Path, "path", "p", "", "Path to generate the buildpack")
 	cmd.Flags().StringVarP(&flags.Version, "version", "V", "1.0.0", "Version of the generated buildpack")
-	cmd.Flags().StringSliceVarP(&flags.Stacks, "stacks", "s", []string{"io.buildpacks.stacks.jammy"}, "Stack(s) this buildpack will be compatible with"+stringSliceHelp("stack"))
+	cmd.Flags().StringSliceVarP(&flags.Stacks, "stacks", "s", []string{}, "Stack(s) this buildpack will be compatible with"+stringSliceHelp("stack"))
+	cmd.Flags().MarkDeprecated("stacks", "prefer `--targets` instead: https://github.com/buildpacks/rfcs/blob/main/text/0096-remove-stacks-mixins.md")
+	cmd.Flags().StringSliceVarP(&flags.Targets, "targets", "t", []string{runtime.GOOS + "/" + runtime.GOARCH},
+		`Targets are the list platforms that one targeting, these are generated as part of scaffolding inside buildpack.toml file. one can provide target platforms in format [os][/arch][/variant]:[distroname@osversion@anotherversion];[distroname@osversion]
+	- Base case for two different architectures :  '--targets "linux/amd64" --targets "linux/arm64"'
+	- case for distribution version: '--targets "windows/amd64:[email protected]"'
+	- case for different architecture with distributed versions : '--targets "linux/arm/v6:[email protected]"  --targets "linux/arm/v6:[email protected]"'
+	`)
 
 	AddHelpFlag(cmd, "new")
 	return cmd
 }
+
+func getSliceAt[T interface{}](slice []T, index int) (T, error) {
+	if index < 0 || index >= len(slice) {
+		var r T
+		return r, errors.Errorf("index out of bound, cannot access item at index %d of slice with length %d", index, len(slice))
+	}
+
+	return slice[index], nil
+}
+
+var GOOSArch = map[string][]string{
+	"aix":       {"ppc64"},
+	"android":   {"386", "amd64", "arm", "arm64"},
+	"darwin":    {"amd64", "arm64"},
+	"dragonfly": {"amd64"},
+	"freebsd":   {"386", "amd64", "arm"},
+	"illumos":   {"amd64"},
+	"ios":       {"arm64"},
+	"js":        {"wasm"},
+	"linux":     {"386", "amd64", "arm", "arm64", "loong64", "mips", "mipsle", "mips64", "mips64le", "ppc64", "ppc64le", "riscv64", "s390x"},
+	"netbsd":    {"386", "amd64", "arm"},
+	"openbsd":   {"386", "amd64", "arm", "arm64"},
+	"plan9":     {"386", "amd64", "arm"},
+	"solaris":   {"amd64"},
+	"wasip1":    {"wasm"},
+	"windows":   {"386", "amd64", "arm", "arm64"},
+}
+
+var GOArchVariant = map[string][]string{
+	"386":      {"softfloat", "sse2"},
+	"arm":      {"v5", "v6", "v7"},
+	"amd64":    {"v1", "v2", "v3", "v4"},
+	"mips":     {"hardfloat", "softfloat"},
+	"mipsle":   {"hardfloat", "softfloat"},
+	"mips64":   {"hardfloat", "softfloat"},
+	"mips64le": {"hardfloat", "softfloat"},
+	"ppc64":    {"power8", "power9"},
+	"ppc64le":  {"power8", "power9"},
+	"wasm":     {"satconv", "signext"},
+}
+
+func isOS(os string) bool {
+	return GOOSArch[os] != nil
+}
+
+func supportsArch(os string, arch string) bool {
+	if isOS(os) {
+		var supported bool
+		for _, s := range GOOSArch[os] {
+			if s == arch {
+				supported = true
+				break
+			}
+		}
+		return supported
+	}
+	return false
+}
+
+func supportsVariant(arch string, variant string) bool {
+	if variant == "" || len(variant) == 0 {
+		return true
+	}
+	var supported bool
+	for _, s := range GOArchVariant[arch] {
+		if s == variant {
+			supported = true
+			break
+		}
+	}
+	return supported
+}
+
+func getTarget(t string) ([]string, []string, []string, error) {
+	var nonDistro, distro []string
+	target := strings.Split(t, ":")
+	if i, e := getSliceAt[string](target, 0); e != nil {
+		return target, nonDistro, distro, errors.Errorf("invalid target %s, atleast one of [os][/arch][/archVariant] must be specified", t)
+	} else {
+		nonDistro = strings.Split(i, "/")
+	}
+	return target, nonDistro, distro, nil
+}
+
+func getPlatform(t []string) (string, string, string, error) {
+	os, _ := getSliceAt[string](t, 0)
+	arch, _ := getSliceAt[string](t, 1)
+	variant, _ := getSliceAt[string](t, 2)
+	if !isOS(os) || !supportsArch(os, arch) || !supportsVariant(arch, variant) {
+		return os, arch, variant, errors.Errorf("unknown target: %s", style.Symbol(strings.Join(t, "/")))
+	}
+	return os, arch, variant, nil
+}

internal/commands/buildpack_new_test.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"os"
 	"path/filepath"
+	"runtime"
 	"testing"
 
 	"github.com/buildpacks/pack/pkg/client"
@@ -60,9 +61,9 @@ func testBuildpackNewCommand(t *testing.T, when spec.G, it spec.S) {
 				ID:      "example/some-cnb",
 				Path:    filepath.Join(tmpDir, "some-cnb"),
 				Version: "1.0.0",
-				Stacks: []dist.Stack{{
-					ID:     "io.buildpacks.stacks.jammy",
-					Mixins: []string{},
+				Targets: []dist.Target{{
+					OS:   runtime.GOOS,
+					Arch: runtime.GOARCH,
 				}},
 			}).Return(nil).MaxTimes(1)
 
@@ -82,5 +83,125 @@ func testBuildpackNewCommand(t *testing.T, when spec.G, it spec.S) {
 			h.AssertNotNil(t, err)
 			h.AssertContains(t, outBuf.String(), "ERROR: directory")
 		})
+
+		when("target flag is specified, ", func() {
+			it("it uses target to generate artifacts", func() {
+				mockClient.EXPECT().NewBuildpack(gomock.Any(), client.NewBuildpackOptions{
+					API:     "0.8",
+					ID:      "example/targets",
+					Path:    filepath.Join(tmpDir, "targets"),
+					Version: "1.0.0",
+					Targets: []dist.Target{{
+						OS:          "linux",
+						Arch:        "arm",
+						ArchVariant: "v6",
+						Distributions: []dist.Distribution{{
+							Name:     "ubuntu",
+							Versions: []string{"14.04", "16.04"},
+						}},
+					}},
+				}).Return(nil).MaxTimes(1)
+
+				path := filepath.Join(tmpDir, "targets")
+				command.SetArgs([]string{"--path", path, "example/targets", "--targets", "linux/arm/v6:[email protected]@16.04"})
+
+				err := command.Execute()
+				h.AssertNil(t, err)
+			})
+			it("it should show error when invalid [os]/[arch] passed", func() {
+				mockClient.EXPECT().NewBuildpack(gomock.Any(), client.NewBuildpackOptions{
+					API:     "0.8",
+					ID:      "example/targets",
+					Path:    filepath.Join(tmpDir, "targets"),
+					Version: "1.0.0",
+					Targets: []dist.Target{{
+						OS:          "os",
+						Arch:        "arm",
+						ArchVariant: "v6",
+						Distributions: []dist.Distribution{{
+							Name:     "ubuntu",
+							Versions: []string{"14.04", "16.04"},
+						}},
+					}},
+				}).Return(nil).MaxTimes(1)
+
+				path := filepath.Join(tmpDir, "targets")
+				command.SetArgs([]string{"--path", path, "example/targets", "--targets", "os/arm/v6:[email protected]@16.04"})
+
+				err := command.Execute()
+				h.AssertNotNil(t, err)
+			})
+			when("it should", func() {
+				it("support format [os][/arch][/variant]:[name@version@version2];[some-name@version@version2]", func() {
+					mockClient.EXPECT().NewBuildpack(gomock.Any(), client.NewBuildpackOptions{
+						API:     "0.8",
+						ID:      "example/targets",
+						Path:    filepath.Join(tmpDir, "targets"),
+						Version: "1.0.0",
+						Targets: []dist.Target{
+							{
+								OS:          "linux",
+								Arch:        "arm",
+								ArchVariant: "v6",
+								Distributions: []dist.Distribution{
+									{
+										Name:     "ubuntu",
+										Versions: []string{"14.04", "16.04"},
+									},
+									{
+										Name:     "debian",
+										Versions: []string{"8.10", "10.9"},
+									},
+								},
+							},
+							{
+								OS:   "windows",
+								Arch: "amd64",
+								Distributions: []dist.Distribution{
+									{
+										Name:     "windows-nano",
+										Versions: []string{"10.0.19041.1415"},
+									},
+								},
+							},
+						},
+					}).Return(nil).MaxTimes(1)
+
+					path := filepath.Join(tmpDir, "targets")
+					command.SetArgs([]string{"--path", path, "example/targets", "--targets", "linux/arm/v6:[email protected]@16.04;[email protected]@10.9", "-t", "windows/amd64:[email protected]"})
+
+					err := command.Execute()
+					h.AssertNil(t, err)
+				})
+			})
+			when("stacks ", func() {
+				it("flag should show deprecated message when used", func() {
+					mockClient.EXPECT().NewBuildpack(gomock.Any(), client.NewBuildpackOptions{
+						API:     "0.8",
+						ID:      "example/stacks",
+						Path:    filepath.Join(tmpDir, "stacks"),
+						Version: "1.0.0",
+						Stacks: []dist.Stack{{
+							ID:     "io.buildpacks.stacks.jammy",
+							Mixins: []string{},
+						}},
+						Targets: []dist.Target{{
+							OS:   runtime.GOOS,
+							Arch: runtime.GOARCH,
+						}},
+					}).Return(nil).MaxTimes(1)
+
+					path := filepath.Join(tmpDir, "stacks")
+					output := new(bytes.Buffer)
+					command.SetOut(output)
+					command.SetErr(output)
+					command.SetArgs([]string{"--path", path, "example/stacks", "--stacks", "io.buildpacks.stacks.jammy"})
+
+					err := command.Execute()
+					h.AssertNil(t, err)
+					h.AssertContains(t, output.String(), "Flag --stacks has been deprecated,")
+				})
+			})
+		})
 	})
 }

pkg/client/build.go

@@ -1307,7 +1307,7 @@ func createInlineBuildpack(bp projectTypes.Buildpack, stackID string) (string, e
 		bp.Version = "0.0.0"
 	}
 
-	if err = createBuildpackTOML(pathToInlineBuilpack, bp.ID, bp.Version, bp.Script.API, []dist.Stack{{ID: stackID}}, nil); err != nil {
+	if err = createBuildpackTOML(pathToInlineBuilpack, bp.ID, bp.Version, bp.Script.API, []dist.Stack{{ID: stackID}}, []dist.Target{}, nil); err != nil {
 		return pathToInlineBuilpack, err
 	}
 

pkg/client/new_buildpack.go

@@ -43,12 +43,15 @@ type NewBuildpackOptions struct {
 	// version of the output buildpack artifact.
 	Version string
 
-	// The stacks this buildpack will work with
+	// Deprecated: The stacks this buildpack will work with
 	Stacks []dist.Stack
+
+	// the targets this buildpack will work with
+	Targets []dist.Target
 }
 
 func (c *Client) NewBuildpack(ctx context.Context, opts NewBuildpackOptions) error {
-	err := createBuildpackTOML(opts.Path, opts.ID, opts.Version, opts.API, opts.Stacks, c)
+	err := createBuildpackTOML(opts.Path, opts.ID, opts.Version, opts.API, opts.Stacks, opts.Targets, c)
 	if err != nil {
 		return err
 	}
@@ -94,15 +97,16 @@ func createBinScript(path, name, contents string, c *Client) error {
 	return nil
 }
 
-func createBuildpackTOML(path, id, version, apiStr string, stacks []dist.Stack, c *Client) error {
+func createBuildpackTOML(path, id, version, apiStr string, stacks []dist.Stack, targets []dist.Target, c *Client) error {
 	api, err := api.NewVersion(apiStr)
 	if err != nil {
 		return err
 	}
 
 	buildpackTOML := dist.BuildpackDescriptor{
-		WithAPI:    api,
-		WithStacks: stacks,
+		WithAPI:     api,
+		WithStacks:  stacks,
+		WithTargets: targets,
 		WithInfo: dist.ModuleInfo{
 			ID:      id,
 			Version: version,

pkg/dist/buildmodule.go

@@ -55,6 +55,7 @@ type Stack struct {
 type Target struct {
 	OS            string         `json:"os" toml:"os"`
 	Arch          string         `json:"arch" toml:"arch"`
+	ArchVariant   string         `json:"variant,omitempty" toml:"variant,omitempty"`
 	Distributions []Distribution `json:"distributions,omitempty" toml:"distributions,omitempty"`
 }
 

pkg/dist/buildpack_descriptor.go

@@ -15,7 +15,7 @@ import (
 type BuildpackDescriptor struct {
 	WithAPI          *api.Version `toml:"api"`
 	WithInfo         ModuleInfo   `toml:"buildpack"`
-	WithStacks       []Stack      `toml:"stacks"`
+	WithStacks       []Stack      `toml:"stacks,omitempty"`
 	WithTargets      []Target     `toml:"targets,omitempty"`
 	WithOrder        Order        `toml:"order"`
 	WithWindowsBuild bool