add --pull flag for podman create&run

Requirement from https://github.com/containers/libpod/issues/3575#issuecomment-512238393

Added --pull for podman create and pull to match the newly added flag in docker CLI.
`missing`: default value, podman will pull the image if it does not exist in the local.
`always`: podman will always pull the image.
`never`: podman will never pull the image.

Signed-off-by: Qi Wang <qiwan@redhat.com>

2 files changed, 10 insertions, 7 deletions

diff --git a/libpod/image/image.go b/libpod/image/image.go
index 068491f28..cb7c390c6 100644
--- a/libpod/image/image.go
+++ b/libpod/image/image.go
@@ -135,7 +135,7 @@ func (ir *Runtime) NewFromLocal(name string) (*Image, error) {
 
 // New creates a new image object where the image could be local
 // or remote
-func (ir *Runtime) New(ctx context.Context, name, signaturePolicyPath, authfile string, writer io.Writer, dockeroptions *DockerRegistryOptions, signingoptions SigningOptions, forcePull bool, label *string) (*Image, error) {
+func (ir *Runtime) New(ctx context.Context, name, signaturePolicyPath, authfile string, writer io.Writer, dockeroptions *DockerRegistryOptions, signingoptions SigningOptions, label *string, pullType util.PullType) (*Image, error) {
 	span, _ := opentracing.StartSpanFromContext(ctx, "newImage")
 	span.SetTag("type", "runtime")
 	defer span.Finish()
@@ -145,11 +145,13 @@ func (ir *Runtime) New(ctx context.Context, name, signaturePolicyPath, authfile
 		InputName:    name,
 		imageruntime: ir,
 	}
-	if !forcePull {
+	if pullType != util.PullImageAlways {
 		localImage, err := newImage.getLocalImage()
 		if err == nil {
 			newImage.image = localImage
 			return &newImage, nil
+		} else if pullType == util.PullImageNever {
+			return nil, err
 		}
 	}
 
diff --git a/libpod/image/image_test.go b/libpod/image/image_test.go
index e93ebf797..5a6d095f6 100644
--- a/libpod/image/image_test.go
+++ b/libpod/image/image_test.go
@@ -3,12 +3,13 @@ package image
 import (
 	"context"
 	"fmt"
-	"github.com/containers/libpod/libpod/events"
 	"io"
 	"io/ioutil"
 	"os"
 	"testing"
 
+	"github.com/containers/libpod/libpod/events"
+	"github.com/containers/libpod/pkg/util"
 	"github.com/containers/storage"
 	"github.com/opencontainers/go-digest"
 	"github.com/stretchr/testify/assert"
@@ -89,9 +90,9 @@ func TestImage_NewFromLocal(t *testing.T) {
 	ir, err := NewImageRuntimeFromOptions(so)
 	assert.NoError(t, err)
 	ir.Eventer = events.NewNullEventer()
-	bb, err := ir.New(context.Background(), "docker.io/library/busybox:latest", "", "", writer, nil, SigningOptions{}, false, nil)
+	bb, err := ir.New(context.Background(), "docker.io/library/busybox:latest", "", "", writer, nil, SigningOptions{}, nil, util.PullImageMissing)
 	assert.NoError(t, err)
-	bbglibc, err := ir.New(context.Background(), "docker.io/library/busybox:glibc", "", "", writer, nil, SigningOptions{}, false, nil)
+	bbglibc, err := ir.New(context.Background(), "docker.io/library/busybox:glibc", "", "", writer, nil, SigningOptions{}, nil, util.PullImageMissing)
 	assert.NoError(t, err)
 
 	tm, err := makeLocalMatrix(bb, bbglibc)
@@ -139,7 +140,7 @@ func TestImage_New(t *testing.T) {
 	// Iterate over the names and delete the image
 	// after the pull
 	for _, img := range names {
-		newImage, err := ir.New(context.Background(), img, "", "", writer, nil, SigningOptions{}, false, nil)
+		newImage, err := ir.New(context.Background(), img, "", "", writer, nil, SigningOptions{}, nil, util.PullImageMissing)
 		assert.NoError(t, err)
 		assert.NotEqual(t, newImage.ID(), "")
 		err = newImage.Remove(context.Background(), false)
@@ -168,7 +169,7 @@ func TestImage_MatchRepoTag(t *testing.T) {
 	ir, err := NewImageRuntimeFromOptions(so)
 	assert.NoError(t, err)
 	ir.Eventer = events.NewNullEventer()
-	newImage, err := ir.New(context.Background(), "busybox", "", "", os.Stdout, nil, SigningOptions{}, false, nil)
+	newImage, err := ir.New(context.Background(), "busybox", "", "", os.Stdout, nil, SigningOptions{}, nil, util.PullImageMissing)
 	assert.NoError(t, err)
 	err = newImage.TagImage("foo:latest")
 	assert.NoError(t, err)