feat: support for ipk packages

Implements goreleaser#507.

* Adds ipk support for keywords used by OpenWRT and Yocto.
* MD5sum is explicitly excluded due to insecurity.
* SHA256Sum excluded due packages not being individually signed,
  instead, the feed of packages is checksummed and signed externally.
* Adds code to nfpm package to automatically enumerate the supported
  packaging types where possible.

.github/workflows/build.yml

@@ -65,7 +65,7 @@ jobs:
   acceptance-tests:
     strategy:
       matrix:
-        pkgFormat: [deb, rpm, apk, archlinux]
+        pkgFormat: [deb, rpm, apk, archlinux, ipk]
         pkgPlatform: [amd64, arm64, 386, ppc64le, armv6, armv7, s390x]
     runs-on: ubuntu-latest
     env:

acceptance_test.go

@@ -15,6 +15,7 @@ import (
 	_ "github.com/goreleaser/nfpm/v2/apk"
 	_ "github.com/goreleaser/nfpm/v2/arch"
 	_ "github.com/goreleaser/nfpm/v2/deb"
+	_ "github.com/goreleaser/nfpm/v2/ipk"
 	_ "github.com/goreleaser/nfpm/v2/rpm"
 	"github.com/stretchr/testify/require"
 )
@@ -23,6 +24,7 @@ import (
 var formatArchs = map[string][]string{
 	"apk":       {"amd64", "arm64", "386", "ppc64le", "armv6", "armv7", "s390x"},
 	"deb":       {"amd64", "arm64", "ppc64le", "armv7", "s390x"},
+	"ipk":       {"amd64", "aarch64_generic", "i386_pentium4"},
 	"rpm":       {"amd64", "arm64", "ppc64le"},
 	"archlinux": {"amd64"},
 }
@@ -261,6 +263,38 @@ func TestDebSpecific(t *testing.T) {
 	}
 }
 
+func TestIPKSpecific(t *testing.T) {
+	t.Parallel()
+	format := "ipk"
+	testNames := []string{
+		"alternatives",
+		"conflicts",
+		"predepends",
+	}
+	for _, name := range testNames {
+		for _, arch := range formatArchs[format] {
+			func(t *testing.T, testName, testArch string) {
+				t.Run(fmt.Sprintf("%s/%s/%s", format, testArch, testName), func(t *testing.T) {
+					t.Parallel()
+					if testArch == "ppc64le" && os.Getenv("NO_TEST_PPC64LE") == "true" {
+						t.Skip("ppc64le arch not supported in pipeline")
+					}
+					accept(t, acceptParms{
+						Name:   fmt.Sprintf("%s_%s", testName, testArch),
+						Conf:   fmt.Sprintf("%s.%s.yaml", format, testName),
+						Format: format,
+						Docker: dockerParams{
+							File:   fmt.Sprintf("%s.dockerfile", format),
+							Target: testName,
+							Arch:   testArch,
+						},
+					})
+				})
+			}(t, name, arch)
+		}
+	}
+}
+
 func TestRPMSign(t *testing.T) {
 	t.Parallel()
 	for _, os := range []string{"centos9", "centos8", "fedora34", "fedora36", "fedora38"} {

cmd/nfpm/main.go

@@ -33,7 +33,7 @@ func main() {
 
 func buildVersion(version, commit, date, builtBy, treeState string) goversion.Info {
 	return goversion.GetVersionInfo(
-		goversion.WithAppDetails("nfpm", "a simple and 0-dependencies deb, rpm, apk and arch linux packager written in Go", website),
+		goversion.WithAppDetails("nfpm", "a simple and 0-dependencies apk, arch linux, deb, ipk, and rpm packager written in Go", website),
 		goversion.WithASCIIName(asciiArt),
 		func(i *goversion.Info) {
 			if commit != "" {

internal/cmd/package.go

@@ -6,6 +6,7 @@ import (
 	"os"
 	"path"
 	"path/filepath"
+	"strings"
 
 	"github.com/goreleaser/nfpm/v2"
 	"github.com/spf13/cobra"
@@ -37,9 +38,12 @@ func newPackageCmd() *packageCmd {
 	_ = cmd.MarkFlagFilename("config", "yaml", "yml")
 	cmd.Flags().StringVarP(&root.target, "target", "t", "", "where to save the generated package (filename, folder or empty for current folder)")
 	_ = cmd.MarkFlagFilename("target")
-	cmd.Flags().StringVarP(&root.packager, "packager", "p", "", "which packager implementation to use [apk|deb|rpm|archlinux]")
-	_ = cmd.RegisterFlagCompletionFunc("packager", cobra.FixedCompletions(
-		[]string{"apk", "deb", "rpm", "archlinux"},
+
+	pkgs := nfpm.Enumerate()
+
+	cmd.Flags().StringVarP(&root.packager, "packager", "p", "",
+		fmt.Sprintf("which packager implementation to use [%s]", strings.Join(pkgs, "|")))
+	_ = cmd.RegisterFlagCompletionFunc("packager", cobra.FixedCompletions(pkgs,
 		cobra.ShellCompDirectiveNoFileComp,
 	))
 

internal/cmd/root.go

@@ -7,6 +7,7 @@ import (
 	_ "github.com/goreleaser/nfpm/v2/apk"  // apk packager
 	_ "github.com/goreleaser/nfpm/v2/arch" // archlinux packager
 	_ "github.com/goreleaser/nfpm/v2/deb"  // deb packager
+	_ "github.com/goreleaser/nfpm/v2/ipk"  // ipk packager
 	_ "github.com/goreleaser/nfpm/v2/rpm"  // rpm packager
 	"github.com/spf13/cobra"
 )
@@ -35,8 +36,8 @@ func newRootCmd(version goversion.Info, exit func(int)) *rootCmd {
 	}
 	cmd := &cobra.Command{
 		Use:               "nfpm",
-		Short:             "Packages apps on RPM, Deb, APK and Arch Linux formats based on a YAML configuration file",
-		Long:              `nFPM is a simple and 0-dependencies deb, rpm, apk and arch linux packager written in Go.`,
+		Short:             "Packages apps on RPM, Deb, APK, Arch Linux, and ipk formats based on a YAML configuration file",
+		Long:              `nFPM is a simple and 0-dependencies apk, arch, deb, ipk and rpm linux packager written in Go.`,
 		Version:           version.String(),
 		SilenceUsage:      true,
 		SilenceErrors:     true,