Add --quiet to machine ls

The podman machine ls command would benefit from a --quiet flag which
would only print the machine names without the extra information.  It
also implies --noheader as well.  This can be helpful for scripting with
the podman cli.

Signed-off-by: Brent Baude <bbaude@redhat.com>

[NO NEW TESTS NEEDED]

Signed-off-by: Brent Baude <bbaude@redhat.com>

1 files changed, 11 insertions, 3 deletions

diff --git a/cmd/podman/machine/list.go b/cmd/podman/machine/list.go
index b57d911a8..587e521a3 100644
--- a/cmd/podman/machine/list.go
+++ b/cmd/podman/machine/list.go
@@ -41,6 +41,7 @@ var (
 type listFlagType struct {
 	format    string
 	noHeading bool
+	quiet     bool
 }
 
 type machineReporter struct {
@@ -70,6 +71,7 @@ func init() {
 	flags.StringVar(&listFlag.format, formatFlagName, "{{.Name}}\t{{.VMType}}\t{{.Created}}\t{{.LastUp}}\t{{.CPUs}}\t{{.Memory}}\t{{.DiskSize}}\n", "Format volume output using JSON or a Go template")
 	_ = lsCmd.RegisterFlagCompletionFunc(formatFlagName, common.AutocompleteFormat(machineReporter{}))
 	flags.BoolVar(&listFlag.noHeading, "noheading", false, "Do not print headers")
+	flags.BoolVarP(&listFlag.quiet, "quiet", "q", false, "Show only machine names")
 }
 
 func list(cmd *cobra.Command, args []string) error {
@@ -79,6 +81,10 @@ func list(cmd *cobra.Command, args []string) error {
 		err          error
 	)
 
+	if listFlag.quiet {
+		listFlag.format = "{{.Name}}\n"
+	}
+
 	provider := getSystemDefaultProvider()
 	listResponse, err = provider.List(opts)
 	if err != nil {
@@ -124,7 +130,10 @@ func outputTemplate(cmd *cobra.Command, responses []*machineReporter) error {
 		"Memory":   "MEMORY",
 		"DiskSize": "DISK SIZE",
 	})
-
+	printHeader := !listFlag.noHeading
+	if listFlag.quiet {
+		printHeader = false
+	}
 	var row string
 	switch {
 	case cmd.Flags().Changed("format"):
@@ -146,8 +155,7 @@ func outputTemplate(cmd *cobra.Command, responses []*machineReporter) error {
 		return err
 	}
 	defer w.Flush()
-
-	if !listFlag.noHeading {
+	if printHeader {
 		if err := tmpl.Execute(w, headers); err != nil {
 			return errors.Wrapf(err, "failed to write report column headers")
 		}