feat: implement list of available distros

distro.go

@@ -6,6 +6,7 @@ import (
 	"os"
 	"path/filepath"
 	"regexp"
+	"strings"
 	"time"
 
 	"github.com/cavaliergopher/grab/v3"
@@ -21,7 +22,9 @@ import (
 )
 
 type DistroCmd struct {
-	Debian DebianCmd `cmd:""`
+	List DistroListCmd `cmd:"" help:"list available distros"`
+
+	Debian DebianCmd `cmd:"" hidden:""`
 }
 
 type DebianCmd struct {
@@ -183,3 +186,12 @@ func (cmd *DebianFetchCmd) Run(dcmd *DebianCmd) (err error) {
 	}
 	return
 }
+
+type DistroListCmd struct{}
+
+func (cmd *DistroListCmd) Run() (err error) {
+	for _, d := range distro.List() {
+		fmt.Println(d.ID, strings.Title(d.Release))
+	}
+	return
+}

distro/centos/centos.go

@@ -34,6 +34,10 @@ func (centos CentOS) ID() distro.ID {
 	return distro.CentOS
 }
 
+func (centos CentOS) Release() string {
+	return centos.release
+}
+
 func (centos CentOS) Equal(d distro.Distro) bool {
 	return centos.release == d.Release && distro.CentOS == d.ID
 }

distro/debian/debian.go

@@ -47,6 +47,10 @@ func (d Debian) ID() distro.ID {
 	return distro.Debian
 }
 
+func (d Debian) Release() string {
+	return d.release.String()
+}
+
 func (d Debian) Equal(dd distro.Distro) bool {
 	if dd.ID != distro.Debian {
 		return false

distro/distro.go

@@ -9,6 +9,7 @@ var distros []distribution
 
 type distribution interface {
 	ID() ID
+	Release() string
 	Equal(Distro) bool
 	Packages() (packages []string, err error)
 }
@@ -20,6 +21,20 @@ func Register(d distribution) {
 	distros = append(distros, d)
 }
 
+func List() (dds []Distro) {
+	mu.Lock()
+	defer mu.Unlock()
+
+	for _, dd := range distros {
+		dds = append(dds, Distro{
+			ID:      dd.ID(),
+			Release: dd.Release(),
+		})
+	}
+
+	return
+}
+
 type Distro struct {
 	ID      ID
 	Release string

distro/oraclelinux/oraclelinux.go

@@ -34,6 +34,10 @@ func (ol OracleLinux) ID() distro.ID {
 	return distro.OracleLinux
 }
 
+func (ol OracleLinux) Release() string {
+	return ol.release
+}
+
 func (ol OracleLinux) Equal(d distro.Distro) bool {
 	return ol.release == d.Release && distro.OracleLinux == d.ID
 }

distro/ubuntu/ubuntu.go

@@ -40,6 +40,10 @@ func (u Ubuntu) ID() distro.ID {
 	return distro.Ubuntu
 }
 
+func (u Ubuntu) Release() string {
+	return u.release
+}
+
 func (u Ubuntu) Equal(d distro.Distro) bool {
 	return u.release == d.Release && distro.Ubuntu == d.ID
 }

main.go

@@ -53,7 +53,7 @@ type CLI struct {
 	Gen       GenCmd       `cmd:"" help:"generate .out-of-tree.toml skeleton"`
 	Image     ImageCmd     `cmd:"" help:"manage images"`
 	Container ContainerCmd `cmd:"" help:"manage containers"`
-	Distro    DistroCmd    `cmd:"" help:"distro-related helpers" hidden:""`
+	Distro    DistroCmd    `cmd:"" help:"distro-related helpers"`
 
 	Version VersionFlag `name:"version" help:"print version information and quit"`