Distro: add Nick() to the distro.Distro interface

Some distributions use nicknames for releases. Add it to the
distro.Distro interface.

Signed-off-by: Tomáš Hozza <[email protected]>

pkg/distro/distro.go

@@ -41,6 +41,9 @@ type Distro interface {
 	// Returns the name of the distro.
 	Name() string
 
+	// Returns the nick of the distro.
+	Nick() string
+
 	// Returns the release version of the distro. This is used in repo
 	// files on the host system and required for the subscription support.
 	Releasever() string

pkg/distro/fedora/distro.go

@@ -469,6 +469,10 @@ func (d *distribution) Name() string {
 	return d.name
 }
 
+func (d *distribution) Nick() string {
+	return "" // Fedora does not use distro nick
+}
+
 func (d *distribution) Releasever() string {
 	return d.releaseVersion
 }

pkg/distro/rhel/distribution.go

@@ -16,6 +16,7 @@ type DefaultDistroImageConfigFunc func(d *Distribution) *distro.ImageConfig
 
 type Distribution struct {
 	name               string
+	DistNick           string
 	product            string
 	osVersion          string
 	releaseVersion     string
@@ -34,6 +35,10 @@ func (d *Distribution) Name() string {
 	return d.name
 }
 
+func (d *Distribution) Nick() string {
+	return d.DistNick
+}
+
 func (d *Distribution) Releasever() string {
 	return d.releaseVersion
 }

pkg/distro/rhel7/distro.go

@@ -68,6 +68,10 @@ func (d *distribution) Name() string {
 	return d.name
 }
 
+func (d *distribution) Nick() string {
+	return d.nick
+}
+
 func (d *distribution) Releasever() string {
 	return d.releaseVersion
 }

pkg/distro/test_distro/distro.go

@@ -78,6 +78,10 @@ func (d *TestDistro) Name() string {
 	return d.name
 }
 
+func (d *TestDistro) Nick() string {
+	return "" // not supported
+}
+
 func (d *TestDistro) Releasever() string {
 	return d.releasever
 }