More cleanup for failures on missing commands.

Currently in podman if a user specifies a command that does not exist
the tool shows the help information.  This patch changes it to show
information like:

$ ./bin/podman foobar
Error: unrecognized command 'podman foobar'
Try 'podman --help' for more information.
$ ./bin/podman volume foobar
Error: unrecognized command `podman volume foobar`
Try 'podman volume --help' for more information.
$ ./bin/podman container foobar
Error: unrecognized command `podman container foobar`
Try 'podman container --help' for more information.

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

1 files changed, 12 insertions, 2 deletions

diff --git a/cmd/podman/common.go b/cmd/podman/common.go
index 9cd1998c8..1de0c7187 100644
--- a/cmd/podman/common.go
+++ b/cmd/podman/common.go
@@ -3,7 +3,6 @@ package main
 import (
 	"context"
 	"fmt"
-	"github.com/spf13/cobra"
 	"os"
 	"strings"
 
@@ -14,6 +13,7 @@ import (
 	"github.com/containers/storage"
 	"github.com/fatih/camelcase"
 	"github.com/pkg/errors"
+	"github.com/spf13/cobra"
 )
 
 var (
@@ -67,6 +67,16 @@ func noSubArgs(c *cobra.Command, args []string) error {
 	return nil
 }
 
+func commandRunE() func(*cobra.Command, []string) error {
+	return func(cmd *cobra.Command, args []string) error {
+		if len(args) > 0 {
+			return errors.Errorf("unrecognized command `%s %s`\nTry '%s --help' for more information.", cmd.CommandPath(), args[0], cmd.CommandPath())
+		} else {
+			return errors.Errorf("missing command '%s COMMAND'\nTry '%s --help' for more information.", cmd.CommandPath(), cmd.CommandPath())
+		}
+	}
+}
+
 // getAllOrLatestContainers tries to return the correct list of containers
 // depending if --all, --latest or <container-id> is used.
 // It requires the Context (c) and the Runtime (runtime). As different
@@ -537,7 +547,7 @@ Description:
 // This blocks the desplaying of the global options. The main podman
 // command should not use this.
 func UsageTemplate() string {
-	return `Usage:{{if .Runnable}}
+	return `Usage:{{if (and .Runnable (not .HasAvailableSubCommands))}}
   {{.UseLine}}{{end}}{{if .HasAvailableSubCommands}}
   {{.CommandPath}} [command]{{end}}{{if gt (len .Aliases) 0}}