fix panic with podman pull

when there are no registries configured for the system and the user provided
a short image name, we panic'd due a logic bug in recent image pull changes.

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

Closes: #841
Approved by: rhatdan

libpod/image/pull.go

@@ -225,7 +225,23 @@ func (i *Image) pullImage(ctx context.Context, writer io.Writer, authfile, signa
 			images = append(images, imageInfo.image)
 		}
 	}
-	return images, errors.Wrapf(err, "error pulling image from")
+	// If no image was found, we should handle.  Lets be nicer to the user and see if we can figure out why.
+	if len(images) == 0 {
+		registryPath := sysregistries.RegistriesConfPath(&types.SystemContext{})
+		searchRegistries, err := registries.GetRegistries()
+		if err != nil {
+			return nil, err
+		}
+		hasRegistryInName, err := i.hasRegistry()
+		if err != nil {
+			return nil, err
+		}
+		if !hasRegistryInName && len(searchRegistries) == 0 {
+			return nil, errors.Errorf("image name provided is a short name and no search registries are defined in %s.", registryPath)
+		}
+		return nil, errors.Errorf("unable to find image in the registries defined in %q", registryPath)
+	}
+	return images, nil
 }
 
 // createNamesToPull looks at a decomposed image and determines the possible
@@ -281,3 +297,13 @@ func (i *Image) createNamesToPull() ([]*pullStruct, error) {
 
 	return pullNames, nil
 }
+
+// isShortName returns a bool response if the input image name has a registry
+// name in it or not
+func (i *Image) isShortName() (bool, error) {
+	decomposedImage, err := decompose(i.InputName)
+	if err != nil {
+		return false, err
+	}
+	return decomposedImage.hasRegistry, nil
+}

vendor.conf

@@ -10,7 +10,7 @@ github.com/containerd/cgroups 77e628511d924b13a77cebdc73b757a47f6d751b
 github.com/containerd/continuity master
 github.com/containernetworking/cni v0.6.0
 github.com/containernetworking/plugins 1fb94a4222eafc6f948eacdca9c9f2158b427e53
-github.com/containers/image 3143027065e31d25d8d2b6fe84b250a320fd9130
+github.com/containers/image ad33f7b73fbac0acf05b9e2cea021b61b4b0c3e0
 github.com/containers/storage 0b8ab959bba614a4f88bb3791dbc078c3d47f259
 github.com/coreos/go-systemd v14
 github.com/cri-o/ocicni master

vendor/github.com/containers/image/docker/daemon/client.go

@@ -30,13 +30,13 @@ func newDockerClient(sys *types.SystemContext) (*dockerclient.Client, error) {
 	//
 	// Similarly, if we want to communicate over plain HTTP on a TCP socket, we also need to set
 	// TLSClientConfig to nil. This can be achieved by using the form `http://`
-	proto, _, _, err := dockerclient.ParseHost(host)
+	url, err := dockerclient.ParseHostURL(host)
 	if err != nil {
 		return nil, err
 	}
 	var httpClient *http.Client
-	if proto != "unix" {
-		if proto == "http" {
+	if url.Scheme != "unix" {
+		if url.Scheme == "http" {
 			httpClient = httpConfig()
 		} else {
 			hc, err := tlsConfig(sys)

vendor/github.com/containers/image/pkg/sysregistries/system_registries.go

@@ -42,16 +42,7 @@ func normalizeRegistries(regs *registries) {
 // Reads the global registry file from the filesystem. Returns
 // a byte array
 func readRegistryConf(sys *types.SystemContext) ([]byte, error) {
-	dirPath := systemRegistriesConfPath
-	if sys != nil {
-		if sys.SystemRegistriesConfPath != "" {
-			dirPath = sys.SystemRegistriesConfPath
-		} else if sys.RootForImplicitAbsolutePaths != "" {
-			dirPath = filepath.Join(sys.RootForImplicitAbsolutePaths, systemRegistriesConfPath)
-		}
-	}
-	configBytes, err := ioutil.ReadFile(dirPath)
-	return configBytes, err
+	return ioutil.ReadFile(RegistriesConfPath(sys))
 }
 
 // For mocking in unittests
@@ -97,3 +88,16 @@ func GetInsecureRegistries(sys *types.SystemContext) ([]string, error) {
 	}
 	return config.Registries.Insecure.Registries, nil
 }
+
+// RegistriesConfPath is the path to the system-wide registry configuration file
+func RegistriesConfPath(ctx *types.SystemContext) string {
+	path := systemRegistriesConfPath
+	if ctx != nil {
+		if ctx.SystemRegistriesConfPath != "" {
+			path = ctx.SystemRegistriesConfPath
+		} else if ctx.RootForImplicitAbsolutePaths != "" {
+			path = filepath.Join(ctx.RootForImplicitAbsolutePaths, systemRegistriesConfPath)
+		}
+	}
+	return path
+}

vendor/github.com/containers/image/vendor.conf

@@ -5,10 +5,11 @@ github.com/containers/storage master
 github.com/davecgh/go-spew 346938d642f2ec3594ed81d874461961cd0faa76
 github.com/docker/docker-credential-helpers d68f9aeca33f5fd3f08eeae5e9d175edf4e731d1
 github.com/docker/distribution 5f6282db7d65e6d72ad7c2cc66310724a57be716
-github.com/docker/docker 30eb4d8cdc422b023d5f11f29a82ecb73554183b
-github.com/docker/go-connections 3ede32e2033de7505e6500d6c868c2b9ed9f169d
+github.com/docker/docker da99009bbb1165d1ac5688b5c81d2f589d418341
+github.com/docker/go-connections 7beb39f0b969b075d1325fecb092faf27fd357b6
 github.com/docker/go-units 0dadbb0345b35ec7ef35e228dabb8de89a65bf52
 github.com/docker/libtrust aabc10ec26b754e797f9028f4589c5b7bd90dc20
+github.com/containerd/continuity d8fb8589b0e8e85b8c8bbaa8840226d0dfeb7371
 github.com/ghodss/yaml 04f313413ffd65ce25f2541bfd2b2ceec5c0908c
 github.com/gorilla/mux 94e7d24fd285520f3d12ae998f7fdd6b5393d453
 github.com/imdario/mergo 50d4dbd4eb0e84778abe37cefef140271d96fade
@@ -38,3 +39,4 @@ github.com/BurntSushi/toml b26d9c308763d68093482582cea63d69be07a0f0
 github.com/ostreedev/ostree-go aeb02c6b6aa2889db3ef62f7855650755befd460
 github.com/gogo/protobuf fcdc5011193ff531a548e9b0301828d5a5b97fd8
 github.com/pquerna/ffjson master
+github.com/syndtr/gocapability master