Podman pull --all-tags shorthand option

I added the shorthand option for `podman pull --all-tags`. Like Docker,
Podman can now do `podman pull -a`.

Signed-off-by: Jake Correnti <jcorrenti13@gmail.com>

cmd/podman/images/pull.go

@@ -77,7 +77,7 @@ func init() {
 func pullFlags(cmd *cobra.Command) {
 	flags := cmd.Flags()
 
-	flags.BoolVar(&pullOptions.AllTags, "all-tags", false, "All tagged images in the repository will be pulled")
+	flags.BoolVarP(&pullOptions.AllTags, "all-tags", "a", false, "All tagged images in the repository will be pulled")
 
 	credsFlagName := "creds"
 	flags.StringVar(&pullOptions.CredentialsCLI, credsFlagName, "", "`Credentials` (USERNAME:PASSWORD) to use for authenticating to a registry")

docs/source/markdown/podman-pull.1.md

@@ -43,7 +43,7 @@ $ podman pull oci-archive:/tmp/myimage
 ```
 
 ## OPTIONS
-#### **--all-tags**
+#### **--all-tags**, **-a**
 
 All tagged images in the repository will be pulled.
 

test/e2e/pull_test.go

@@ -110,6 +110,17 @@ var _ = Describe("Podman pull", func() {
 		Expect(len(session.OutputToStringArray())).To(BeNumerically(">=", 2), "Expected at least two images")
 	})
 
+	It("podman pull check all tags shorthand", func() {
+		session := podmanTest.Podman([]string{"pull", "-a", "quay.io/libpod/testdigest_v2s2"})
+		session.WaitWithDefaultTimeout()
+		Expect(session).Should(Exit(0))
+
+		session = podmanTest.Podman([]string{"images"})
+		session.WaitWithDefaultTimeout()
+		Expect(session).Should(Exit(0))
+		Expect(len(session.OutputToStringArray())).To(BeNumerically(">=", 2), "Expected at least two images")
+	})
+
 	It("podman pull from docker with nonexistent --authfile", func() {
 		session := podmanTest.Podman([]string{"pull", "--authfile", "/tmp/nonexistent", ALPINE})
 		session.WaitWithDefaultTimeout()