added targets flag for buildpack new cli

internal/commands/buildpack_new.go

@@ -5,21 +5,25 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
+	"runtime"
 	"strings"
 
 	"github.com/spf13/cobra"
 
 	"github.com/buildpacks/pack/internal/style"
+	"github.com/buildpacks/pack/internal/target"
 	"github.com/buildpacks/pack/pkg/client"
 	"github.com/buildpacks/pack/pkg/dist"
 	"github.com/buildpacks/pack/pkg/logging"
 )
 
 // 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 +70,20 @@ func BuildpackNew(logger logging.Logger, creator BuildpackCreator) *cobra.Comman
 				})
 			}
 
+			targets, warn, err := target.ParseTargets(flags.Targets)
+			for _, w := range warn.Messages {
+				logger.Warn(w)
+			}
+			if err != nil {
+				return err
+			}
+
 			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
@@ -84,7 +97,14 @@ func BuildpackNew(logger logging.Logger, creator BuildpackCreator) *cobra.Comman
 	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

internal/commands/buildpack_new_test.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"os"
 	"path/filepath"
+	"runtime"
 	"testing"
 
 	"github.com/buildpacks/pack/pkg/client"
@@ -36,6 +37,10 @@ func testBuildpackNewCommand(t *testing.T, when spec.G, it spec.S) {
 		mockClient     *testmocks.MockPackClient
 		tmpDir         string
 	)
+	targets := []dist.Target{{
+		OS:   runtime.GOOS,
+		Arch: runtime.GOARCH,
+	}}
 
 	it.Before(func() {
 		var err error
@@ -60,10 +65,7 @@ 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: targets,
 			}).Return(nil).MaxTimes(1)
 
 			path := filepath.Join(tmpDir, "some-cnb")
@@ -82,5 +84,122 @@ 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: targets,
+					}).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,")
+				})
+			})
+		})
 	})
 }

internal/target/parse.go

@@ -0,0 +1,107 @@
+package target
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/pkg/errors"
+
+	"github.com/buildpacks/pack/internal/style"
+	"github.com/buildpacks/pack/internal/warn"
+	"github.com/buildpacks/pack/pkg/dist"
+)
+
+func ParseTargets(t []string) (targets []dist.Target, warn warn.Warn, err error) {
+	for _, v := range t {
+		target, w, err := ParseTarget(v)
+		warn.AddWarn(w)
+		if err != nil {
+			return nil, warn, err
+		}
+		targets = append(targets, target)
+	}
+	return targets, warn, nil
+}
+
+func ParseTarget(t string) (output dist.Target, warn warn.Warn, err error) {
+	nonDistro, distros, w, err := getTarget(t)
+	warn.AddWarn(w)
+	if v, _ := getSliceAt[string](nonDistro, 0); len(nonDistro) <= 1 && v == "" {
+		warn.Add(style.Error("os/arch must be defined"))
+	}
+	if err != nil {
+		return output, warn, err
+	}
+	os, arch, variant, w, err := getPlatform(nonDistro)
+	warn.AddWarn(w)
+	if err != nil {
+		return output, warn, err
+	}
+	v, w, err := ParseDistros(distros)
+	warn.AddWarn(w)
+	if err != nil {
+		return output, warn, err
+	}
+	output = dist.Target{
+		OS:            os,
+		Arch:          arch,
+		ArchVariant:   variant,
+		Distributions: v,
+	}
+	return output, warn, err
+}
+
+func ParseDistros(distroSlice string) (distros []dist.Distribution, warn warn.Warn, err error) {
+	distro := strings.Split(distroSlice, ";")
+	if l := len(distro); l == 1 && distro[0] == "" {
+		return nil, warn, err
+	}
+	for _, d := range distro {
+		v, w, err := ParseDistro(d)
+		warn.AddWarn(w)
+		if err != nil {
+			return nil, warn, err
+		}
+		distros = append(distros, v)
+	}
+	return distros, warn, nil
+}
+
+func ParseDistro(distroString string) (distro dist.Distribution, warn warn.Warn, err error) {
+	d := strings.Split(distroString, "@")
+	if d[0] == "" || len(d) == 0 {
+		return distro, warn, errors.Errorf("distro's versions %s cannot be specified without distro's name", style.Symbol("@"+strings.Join(d[1:], "@")))
+	}
+	if len(d) <= 2 && d[0] == "" {
+		warn.Add(fmt.Sprintf("distro with name %s has no specific version!", style.Symbol(d[0])))
+	}
+	distro.Name = d[0]
+	distro.Versions = d[1:]
+	return distro, warn, err
+}
+
+func getTarget(t string) (nonDistro []string, distros string, warn warn.Warn, err error) {
+	target := strings.Split(t, ":")
+	if _, err := getSliceAt[string](target, 0); err != nil {
+		return nonDistro, distros, warn, errors.Errorf("invalid target %s, atleast one of [os][/arch][/archVariant] must be specified", t)
+	}
+	if len(target) == 2 && target[0] == "" {
+		v, _ := getSliceAt[string](target, 1)
+		warn.Add(style.Warn("adding distros %s without [os][/arch][/variant]", v))
+	} else {
+		i, _ := getSliceAt[string](target, 0)
+		nonDistro = strings.Split(i, "/")
+	}
+	if i, err := getSliceAt[string](target, 1); err == nil {
+		distros = i
+	}
+	return nonDistro, distros, warn, err
+}
+
+func getSliceAt[T interface{}](slice []T, index int) (value T, err error) {
+	if index < 0 || index >= len(slice) {
+		return value, errors.Errorf("index out of bound, cannot access item at index %d of slice with length %d", index, len(slice))
+	}
+
+	return slice[index], err
+}