jpictl: introduce -e for jpictl env to export variables

Signed-off-by: Alejandro Mery <amery@jpi.io>

pkg/zones/env.go

@@ -10,12 +10,15 @@ import (
 // Env is a shell environment factory for this cluster
 type Env struct {
 	ZoneIterator
+
+	export bool
 }
 
 // Env returns a shell environment factory
-func (m *Zones) Env() *Env {
+func (m *Zones) Env(export bool) *Env {
 	return &Env{
 		ZoneIterator: m,
+		export:       export,
 	}
 }
 
@@ -63,7 +66,13 @@ func (m *Env) writeEnvVarFn(w io.Writer, fn func(*Env) string, name string, args
 	m.writeEnvVar(w, value, name, args...)
 }
 
-func (*Env) writeEnvVar(w io.Writer, value string, name string, args ...any) {
+func (m *Env) writeEnvVar(w io.Writer, value string, name string, args ...any) {
+	var prefix string
+
+	if m.export {
+		prefix = "export "
+	}
+
 	if len(args) > 0 {
 		name = fmt.Sprintf(name, args...)
 	}
@@ -71,7 +80,7 @@ func (*Env) writeEnvVar(w io.Writer, value string, name string, args ...any) {
 	if name != "" {
 		value = strings.TrimSpace(value)
 
-		_, _ = fmt.Fprintf(w, "%s=%q\n", name, value)
+		_, _ = fmt.Fprintf(w, "%s%s=%q\n", prefix, name, value)
 	}
 }