Add podman manifest create -a. Alias for --amend:Docker compatibility

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

cmd/podman/manifest/create.go

@@ -42,7 +42,7 @@ func init() {
 	})
 	flags := createCmd.Flags()
 	flags.BoolVar(&manifestCreateOpts.All, "all", false, "add all of the lists' images if the images to add are lists")
-	flags.BoolVar(&manifestCreateOpts.Amend, "amend", false, "modify an existing list if one with the desired name already exists")
+	flags.BoolVarP(&manifestCreateOpts.Amend, "amend", "a", false, "modify an existing list if one with the desired name already exists")
 	flags.BoolVar(&manifestCreateOpts.Insecure, "insecure", false, "neither require HTTPS nor verify certificates when accessing the registry")
 	_ = flags.MarkHidden("insecure")
 	flags.BoolVar(&manifestCreateOpts.TLSVerifyCLI, "tls-verify", true, "require HTTPS and verify certificates when accessing the registry")

docs/source/markdown/podman-manifest-create.1.md

@@ -22,7 +22,7 @@ If any of the images which should be added to the new list or index are
 themselves lists or indexes, add all of their contents.  By default, only one
 image from such a list will be added to the newly-created list or index.
 
-#### **--amend**
+#### **--amend**, **-a**
 
 If a manifest list named *listnameorindexname* already exists, modify the
 preexisting list instead of exiting with an error.  The contents of

test/e2e/manifest_test.go

@@ -46,17 +46,23 @@ var _ = Describe("Podman manifest", func() {
 		processTestResult(f)
 	})
 	It("create w/o image", func() {
-		session := podmanTest.Podman([]string{"manifest", "create", "foo"})
-		session.WaitWithDefaultTimeout()
-		Expect(session).Should(Exit(0))
+		for _, amend := range []string{"--amend", "-a"} {
+			session := podmanTest.Podman([]string{"manifest", "create", "foo"})
+			session.WaitWithDefaultTimeout()
+			Expect(session).Should(Exit(0))
 
-		session = podmanTest.Podman([]string{"manifest", "create", "foo"})
-		session.WaitWithDefaultTimeout()
-		Expect(session).To(ExitWithError())
+			session = podmanTest.Podman([]string{"manifest", "create", "foo"})
+			session.WaitWithDefaultTimeout()
+			Expect(session).To(ExitWithError())
 
-		session = podmanTest.Podman([]string{"manifest", "create", "--amend", "foo"})
-		session.WaitWithDefaultTimeout()
-		Expect(session).Should(Exit(0))
+			session = podmanTest.Podman([]string{"manifest", "create", amend, "foo"})
+			session.WaitWithDefaultTimeout()
+			Expect(session).Should(Exit(0))
+
+			session = podmanTest.Podman([]string{"manifest", "rm", "foo"})
+			session.WaitWithDefaultTimeout()
+			Expect(session).Should(Exit(0))
+		}
 	})
 
 	It("create w/ image", func() {