Stage3 Image Library

This represents the stage3 implementation for the image library.  At this point, we
are moving the image-centric functions to pkg/image including migration of args and
object-oriented references.  This is a not a one-for-one migration of funcs and some
funcs will need to continue to reside in runtime_img as they are overly specific to
libpod and probably not useful to others.

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

Closes: #484
Approved by: baude

18 files changed, 745 insertions, 180 deletions

diff --git a/cmd/podman/create.go b/cmd/podman/create.go
index 46429b335..b923ad458 100644
--- a/cmd/podman/create.go
+++ b/cmd/podman/create.go
@@ -18,6 +18,7 @@ import (
 	"github.com/pkg/errors"
 	"github.com/projectatomic/libpod/libpod"
 	"github.com/projectatomic/libpod/pkg/inspect"
+	"github.com/projectatomic/libpod/pkg/util"
 	"github.com/sirupsen/logrus"
 	"github.com/urfave/cli"
 )
@@ -299,7 +300,7 @@ func isPortInPortBindings(pb map[nat.Port][]nat.PortBinding, port nat.Port) bool
 	for _, i := range pb {
 		hostPorts = append(hostPorts, i[0].HostPort)
 	}
-	return libpod.StringInSlice(port.Port(), hostPorts)
+	return util.StringInSlice(port.Port(), hostPorts)
 }
 
 // isPortInImagePorts determines if an exposed host port was given to us by metadata
@@ -625,7 +626,7 @@ func parseCreateOpts(c *cli.Context, runtime *libpod.Runtime, imageName string,
 	}
 
 	// Check for . and dns-search domains
-	if libpod.StringInSlice(".", c.StringSlice("dns-search")) && len(c.StringSlice("dns-search")) > 1 {
+	if util.StringInSlice(".", c.StringSlice("dns-search")) && len(c.StringSlice("dns-search")) > 1 {
 		return nil, errors.Errorf("cannot pass additional search domains when also specifying '.'")
 	}
 
diff --git a/cmd/podman/exec.go b/cmd/podman/exec.go
index 07ef3a0cd..81b69953b 100644
--- a/cmd/podman/exec.go
+++ b/cmd/podman/exec.go
@@ -6,6 +6,7 @@ import (
 
 	"github.com/pkg/errors"
 	"github.com/projectatomic/libpod/libpod"
+	"github.com/projectatomic/libpod/pkg/util"
 	"github.com/urfave/cli"
 )
 
@@ -89,7 +90,7 @@ func execCmd(c *cli.Context) error {
 	// key and value to the environment variables.  this is needed to set
 	// PATH for example.
 	for k, v := range defaultEnvVariables {
-		if !libpod.StringInSlice(k, userEnvKeys) {
+		if !util.StringInSlice(k, userEnvKeys) {
 			envs = append(envs, fmt.Sprintf("%s=%s", k, v))
 		}
 	}
diff --git a/cmd/podman/inspect.go b/cmd/podman/inspect.go
index 8bf6f96be..cfd257af4 100644
--- a/cmd/podman/inspect.go
+++ b/cmd/podman/inspect.go
@@ -9,6 +9,7 @@ import (
 	"github.com/projectatomic/libpod/cmd/podman/formats"
 	"github.com/projectatomic/libpod/libpod"
 	"github.com/projectatomic/libpod/pkg/inspect"
+	"github.com/projectatomic/libpod/pkg/util"
 	"github.com/sirupsen/logrus"
 	"github.com/urfave/cli"
 )
@@ -68,7 +69,7 @@ func inspectCmd(c *cli.Context) error {
 	}
 	defer runtime.Shutdown(false)
 
-	if !libpod.StringInSlice(inspectType, []string{inspectTypeContainer, inspectTypeImage, inspectAll}) {
+	if !util.StringInSlice(inspectType, []string{inspectTypeContainer, inspectTypeImage, inspectAll}) {
 		return errors.Errorf("the only recognized types are %q, %q, and %q", inspectTypeContainer, inspectTypeImage, inspectAll)
 	}
 
diff --git a/cmd/podman/ps.go b/cmd/podman/ps.go
index 4dd7133bc..ca4c4ca82 100644
--- a/cmd/podman/ps.go
+++ b/cmd/podman/ps.go
@@ -17,6 +17,7 @@ import (
 	"github.com/pkg/errors"
 	"github.com/projectatomic/libpod/cmd/podman/formats"
 	"github.com/projectatomic/libpod/libpod"
+	"github.com/projectatomic/libpod/pkg/util"
 	"github.com/sirupsen/logrus"
 	"github.com/urfave/cli"
 	"k8s.io/apimachinery/pkg/fields"
@@ -275,7 +276,7 @@ func generateContainerFilterFuncs(filter, filterValue string, runtime *libpod.Ru
 			return false
 		}, nil
 	case "status":
-		if !libpod.StringInSlice(filterValue, []string{"created", "restarting", "running", "paused", "exited", "unknown"}) {
+		if !util.StringInSlice(filterValue, []string{"created", "restarting", "running", "paused", "exited", "unknown"}) {
 			return nil, errors.Errorf("%s is not a valid status", filterValue)
 		}
 		return func(c *libpod.Container) bool {
diff --git a/libpod/container_internal.go b/libpod/container_internal.go
index ba11dd2c6..85c4283b3 100644
--- a/libpod/container_internal.go
+++ b/libpod/container_internal.go
@@ -26,6 +26,7 @@ import (
 	"github.com/pkg/errors"
 	crioAnnotations "github.com/projectatomic/libpod/pkg/annotations"
 	"github.com/projectatomic/libpod/pkg/chrootuser"
+	"github.com/projectatomic/libpod/pkg/util"
 	"github.com/sirupsen/logrus"
 	"github.com/ulule/deepcopier"
 	"golang.org/x/sys/unix"
@@ -642,7 +643,7 @@ func (c *Container) generateResolvConf() (string, error) {
 	if len(c.config.DNSSearch) > 0 {
 		resolv.searchDomains = nil
 		// The . character means the user doesnt want any search domains in the container
-		if !StringInSlice(".", c.config.DNSSearch) {
+		if !util.StringInSlice(".", c.config.DNSSearch) {
 			resolv.searchDomains = append(resolv.searchDomains, c.Config().DNSSearch...)
 		}
 	}
diff --git a/libpod/container_top.go b/libpod/container_top.go
index 241e3a3e7..bc007c408 100644
--- a/libpod/container_top.go
+++ b/libpod/container_top.go
@@ -7,6 +7,7 @@ import (
 	"strings"
 
 	"github.com/pkg/errors"
+	"github.com/projectatomic/libpod/pkg/util"
 	"github.com/projectatomic/libpod/utils"
 	"github.com/sirupsen/logrus"
 )
@@ -91,7 +92,7 @@ func filterPids(psOutput string, pids []string) ([]string, error) {
 		}
 		cols := fieldsASCII(l)
 		pid := cols[pidIndex]
-		if StringInSlice(pid, pids) {
+		if util.StringInSlice(pid, pids) {
 			output = append(output, l)
 		}
 	}
diff --git a/libpod/image/docker_registry_options.go b/libpod/image/docker_registry_options.go
new file mode 100644
index 000000000..bbb49df28
--- /dev/null
+++ b/libpod/image/docker_registry_options.go
@@ -0,0 +1,46 @@
+package image
+
+import "github.com/containers/image/types"
+
+// DockerRegistryOptions encapsulates settings that affect how we connect or
+// authenticate to a remote registry.
+type DockerRegistryOptions struct {
+	// DockerRegistryCreds is the user name and password to supply in case
+	// we need to pull an image from a registry, and it requires us to
+	// authenticate.
+	DockerRegistryCreds *types.DockerAuthConfig
+	// DockerCertPath is the location of a directory containing CA
+	// certificates which will be used to verify the registry's certificate
+	// (all files with names ending in ".crt"), and possibly client
+	// certificates and private keys (pairs of files with the same name,
+	// except for ".cert" and ".key" suffixes).
+	DockerCertPath string
+	// DockerInsecureSkipTLSVerify turns off verification of TLS
+	// certificates and allows connecting to registries without encryption.
+	DockerInsecureSkipTLSVerify bool
+}
+
+// GetSystemContext constructs a new system context from the given signaturePolicy path and the
+// values in the DockerRegistryOptions
+func (o DockerRegistryOptions) GetSystemContext(signaturePolicyPath, authFile string, forceCompress bool) *types.SystemContext {
+	sc := &types.SystemContext{
+		SignaturePolicyPath:         signaturePolicyPath,
+		DockerAuthConfig:            o.DockerRegistryCreds,
+		DockerCertPath:              o.DockerCertPath,
+		DockerInsecureSkipTLSVerify: o.DockerInsecureSkipTLSVerify,
+		AuthFilePath:                authFile,
+		DirForceCompress:            forceCompress,
+	}
+	return sc
+}
+
+// GetSystemContext Constructs a new containers/image/types.SystemContext{} struct from the given signaturePolicy path
+func GetSystemContext(signaturePolicyPath, authFilePath string, forceCompress bool) *types.SystemContext {
+	sc := &types.SystemContext{}
+	if signaturePolicyPath != "" {
+		sc.SignaturePolicyPath = signaturePolicyPath
+	}
+	sc.AuthFilePath = authFilePath
+	sc.DirForceCompress = forceCompress
+	return sc
+}
diff --git a/libpod/image/image.go b/libpod/image/image.go
index a3f0bce83..b218c7d67 100644
--- a/libpod/image/image.go
+++ b/libpod/image/image.go
@@ -1,15 +1,26 @@
 package image
 
 import (
+	"encoding/json"
 	"fmt"
 	"io"
-	"os"
+	"strings"
+	"syscall"
+	"time"
 
+	types2 "github.com/containernetworking/cni/pkg/types"
+	cp "github.com/containers/image/copy"
 	"github.com/containers/image/docker/reference"
+	is "github.com/containers/image/storage"
+	"github.com/containers/image/transports/alltransports"
+	"github.com/containers/image/types"
 	"github.com/containers/storage"
+	"github.com/containers/storage/pkg/reexec"
+	"github.com/opencontainers/go-digest"
+	ociv1 "github.com/opencontainers/image-spec/specs-go/v1"
 	"github.com/pkg/errors"
-	"github.com/projectatomic/libpod/libpod"
 	"github.com/projectatomic/libpod/pkg/inspect"
+	"github.com/projectatomic/libpod/pkg/util"
 )
 
 // Image is the primary struct for dealing with images
@@ -18,63 +29,113 @@ type Image struct {
 	inspect.ImageData
 	InputName string
 	Local     bool
-	runtime   *libpod.Runtime
-	image     *storage.Image
+	//runtime   *libpod.Runtime
+	image        *storage.Image
+	imageruntime *Runtime
+}
+
+// Runtime contains the store
+type Runtime struct {
+	store storage.Store
+}
+
+// NewImageRuntime creates an Image Runtime including the store given
+// store options
+func NewImageRuntime(options storage.StoreOptions) (*Runtime, error) {
+	if reexec.Init() {
+		return nil, errors.Errorf("unable to reexec")
+	}
+	store, err := setStore(options)
+	if err != nil {
+		return nil, err
+	}
+
+	return &Runtime{
+		store: store,
+	}, nil
+}
+
+func setStore(options storage.StoreOptions) (storage.Store, error) {
+	store, err := storage.GetStore(options)
+	if err != nil {
+		return nil, err
+	}
+	is.Transport.SetStore(store)
+	return store, nil
+}
+
+// newFromStorage creates a new image object from a storage.Image
+func (ir *Runtime) newFromStorage(img *storage.Image) *Image {
+	image := Image{
+		InputName:    img.ID,
+		Local:        true,
+		imageruntime: ir,
+		image:        img,
+	}
+	return &image
 }
 
 // NewFromLocal creates a new image object that is intended
 // to only deal with local images already in the store (or
 // its aliases)
-func NewFromLocal(name string, runtime *libpod.Runtime) (Image, error) {
+func (ir *Runtime) NewFromLocal(name string) (*Image, error) {
+
 	image := Image{
-		InputName: name,
-		Local:     true,
-		runtime:   runtime,
+		InputName:    name,
+		Local:        true,
+		imageruntime: ir,
 	}
 	localImage, err := image.getLocalImage()
 	if err != nil {
-		return Image{}, err
+		return nil, err
 	}
 	image.image = localImage
-	return image, nil
+	return &image, nil
 }
 
 // New creates a new image object where the image could be local
 // or remote
-func New(name string, runtime *libpod.Runtime) (Image, error) {
+func (ir *Runtime) New(name, signaturePolicyPath, authfile string, writer io.Writer, dockeroptions *DockerRegistryOptions, signingoptions SigningOptions) (*Image, error) {
 	// We don't know if the image is local or not ... check local first
 	newImage := Image{
-		InputName: name,
-		Local:     false,
-		runtime:   runtime,
+		InputName:    name,
+		Local:        false,
+		imageruntime: ir,
 	}
 	localImage, err := newImage.getLocalImage()
 	if err == nil {
 		newImage.Local = true
 		newImage.image = localImage
-		return newImage, nil
+		return &newImage, nil
 	}
 
 	// The image is not local
-	pullNames, err := newImage.createNamesToPull()
+
+	imageName, err := newImage.pullImage(writer, authfile, signaturePolicyPath, signingoptions, dockeroptions)
 	if err != nil {
-		return newImage, err
+		return &newImage, errors.Errorf("unable to pull %s", name)
 	}
-	if len(pullNames) == 0 {
-		return newImage, errors.Errorf("unable to pull %s", newImage.InputName)
-	}
-	var writer io.Writer
-	writer = os.Stderr
-	for _, p := range pullNames {
-		_, err := newImage.pull(p, writer, runtime)
-		if err == nil {
-			newImage.InputName = p
-			img, err := newImage.getLocalImage()
-			newImage.image = img
-			return newImage, err
-		}
+
+	newImage.InputName = imageName
+	img, err := newImage.getLocalImage()
+	newImage.image = img
+	return &newImage, nil
+}
+
+// Shutdown closes down the storage and require a bool arg as to
+// whether it should do so forcibly.
+func (ir *Runtime) Shutdown(force bool) error {
+	_, err := ir.store.Shutdown(force)
+	return err
+}
+
+func (i *Image) reloadImage() error {
+	newImage, err := i.imageruntime.getImage(i.ID())
+	if err != nil {
+		return errors.Wrapf(err, "unable to reload image")
 	}
-	return newImage, errors.Errorf("unable to find %s", name)
+	i.image = newImage.image
+	return nil
 }
 
 // getLocalImage resolves an unknown input describing an image and
@@ -85,9 +146,9 @@ func (i *Image) getLocalImage() (*storage.Image, error) {
 		return nil, errors.Errorf("input name is blank")
 	}
 	var taggedName string
-	img, err := i.runtime.GetImage(i.InputName)
+	img, err := i.imageruntime.getImage(i.InputName)
 	if err == nil {
-		return img, err
+		return img.image, err
 	}
 
 	// container-storage wasn't able to find it in its current form
@@ -100,9 +161,9 @@ func (i *Image) getLocalImage() (*storage.Image, error) {
 	// the inputname isn't tagged, so we assume latest and try again
 	if !decomposedImage.isTagged {
 		taggedName = fmt.Sprintf("%s:latest", i.InputName)
-		img, err = i.runtime.GetImage(taggedName)
+		img, err = i.imageruntime.getImage(taggedName)
 		if err == nil {
-			return img, nil
+			return img.image, nil
 		}
 	}
 	hasReg, err := i.hasRegistry()
@@ -116,7 +177,7 @@ func (i *Image) getLocalImage() (*storage.Image, error) {
 	}
 
 	// grab all the local images
-	images, err := i.runtime.GetImages(&libpod.ImageFilterParams{})
+	images, err := i.imageruntime.GetImages()
 	if err != nil {
 		return nil, err
 	}
@@ -149,43 +210,226 @@ func (i *Image) ID() string {
 	return i.image.ID
 }
 
-// createNamesToPull looks at a decomposed image and determines the possible
-// images names to try pulling in combination with the registries.conf file as well
-func (i *Image) createNamesToPull() ([]string, error) {
-	var pullNames []string
-	decomposedImage, err := decompose(i.InputName)
+// Digest returns the image's Manifest
+func (i *Image) Digest() digest.Digest {
+	return i.image.Digest
+}
+
+// Names returns a string array of names associated with the image
+func (i *Image) Names() []string {
+	return i.image.Names
+}
+
+// Created returns the time the image was created
+func (i *Image) Created() time.Time {
+	return i.image.Created
+}
+
+// TopLayer returns the top layer id as a string
+func (i *Image) TopLayer() string {
+	return i.image.TopLayer
+}
+
+// Remove an image; container removal for the image must be done
+// outside the context of images
+func (i *Image) Remove(force bool) error {
+	_, err := i.imageruntime.store.DeleteImage(i.ID(), true)
+	return err
+}
+
+func annotations(manifest []byte, manifestType string) map[string]string {
+	annotations := make(map[string]string)
+	switch manifestType {
+	case ociv1.MediaTypeImageManifest:
+		var m ociv1.Manifest
+		if err := json.Unmarshal(manifest, &m); err == nil {
+			for k, v := range m.Annotations {
+				annotations[k] = v
+			}
+		}
+	}
+	return annotations
+}
+
+// Decompose an Image
+func (i *Image) Decompose() error {
+	return types2.NotImplementedError
+}
+
+// TODO: Rework this method to not require an assembly of the fq name with transport
+/*
+// GetManifest tries to GET an images manifest, returns nil on success and err on failure
+func (i *Image) GetManifest() error {
+	pullRef, err := alltransports.ParseImageName(i.assembleFqNameTransport())
+	if err != nil {
+		return errors.Errorf("unable to parse '%s'", i.Names()[0])
+	}
+	imageSource, err := pullRef.NewImageSource(nil)
+	if err != nil {
+		return errors.Wrapf(err, "unable to create new image source")
+	}
+	_, _, err = imageSource.GetManifest(nil)
+	if err == nil {
+		return nil
+	}
+	return err
+}
+*/
+
+// getImage retrieves an image matching the given name or hash from system
+// storage
+// If no matching image can be found, an error is returned
+func (ir *Runtime) getImage(image string) (*Image, error) {
+	var img *storage.Image
+	ref, err := is.Transport.ParseStoreReference(ir.store, image)
+	if err == nil {
+		img, err = is.Transport.GetStoreImage(ir.store, ref)
+	}
+	if err != nil {
+		img2, err2 := ir.store.Image(image)
+		if err2 != nil {
+			if ref == nil {
+				return nil, errors.Wrapf(err, "error parsing reference to image %q", image)
+			}
+			return nil, errors.Wrapf(err, "unable to locate image %q", image)
+		}
+		img = img2
+	}
+	newImage := ir.newFromStorage(img)
+	return newImage, nil
+}
+
+// GetImages retrieves all images present in storage
+func (ir *Runtime) GetImages() ([]*Image, error) {
+	var newImages []*Image
+	images, err := ir.store.Images()
 	if err != nil {
 		return nil, err
 	}
+	for _, i := range images {
+		newImages = append(newImages, ir.newFromStorage(&i))
+	}
+	return newImages, nil
+}
 
-	if decomposedImage.hasRegistry {
-		pullNames = append(pullNames, i.InputName)
-	} else {
-		registries, err := libpod.GetRegistries()
-		if err != nil {
-			return nil, err
+// getImageDigest creates an image object and uses the hex value of the digest as the image ID
+// for parsing the store reference
+func getImageDigest(src types.ImageReference, ctx *types.SystemContext) (string, error) {
+	newImg, err := src.NewImage(ctx)
+	if err != nil {
+		return "", err
+	}
+	defer newImg.Close()
+	digest := newImg.ConfigInfo().Digest
+	if err = digest.Validate(); err != nil {
+		return "", errors.Wrapf(err, "error getting config info")
+	}
+	return "@" + digest.Hex(), nil
+}
+
+// TagImage adds a tag to the given image
+func (i *Image) TagImage(tag string) error {
+	tags := i.Names()
+	if util.StringInSlice(tag, tags) {
+		return nil
+	}
+	tags = append(tags, tag)
+	i.reloadImage()
+	return i.imageruntime.store.SetNames(i.ID(), tags)
+}
+
+// PushImage pushes the given image to a location described by the given path
+func (i *Image) PushImage(destination, manifestMIMEType, authFile, signaturePolicyPath string, writer io.Writer, forceCompress bool, signingOptions SigningOptions, dockerRegistryOptions *DockerRegistryOptions) error {
+	// PushImage pushes the src image to the destination
+	//func PushImage(source, destination string, options CopyOptions) error {
+	if destination == "" {
+		return errors.Wrapf(syscall.EINVAL, "destination image name must be specified")
+	}
+
+	// Get the destination Image Reference
+	dest, err := alltransports.ParseImageName(destination)
+	if err != nil {
+		if hasTransport(destination) {
+			return errors.Wrapf(err, "error getting destination imageReference for %q", destination)
 		}
-		for _, registry := range registries {
-			decomposedImage.registry = registry
-			pullNames = append(pullNames, decomposedImage.assemble())
+		// Try adding the images default transport
+		destination2 := DefaultTransport + destination
+		dest, err = alltransports.ParseImageName(destination2)
+		if err != nil {
+			return err
 		}
 	}
-	return pullNames, nil
+
+	sc := GetSystemContext(signaturePolicyPath, authFile, forceCompress)
+
+	policyContext, err := getPolicyContext(sc)
+	if err != nil {
+		return err
+	}
+	defer policyContext.Destroy()
+
+	// Look up the source image, expecting it to be in local storage
+	src, err := is.Transport.ParseStoreReference(i.imageruntime.store, i.ID())
+	if err != nil {
+		return errors.Wrapf(err, "error getting source imageReference for %q", i.InputName)
+	}
+
+	copyOptions := getCopyOptions(writer, signaturePolicyPath, nil, dockerRegistryOptions, signingOptions, authFile, manifestMIMEType, forceCompress)
+
+	// Copy the image to the remote destination
+	err = cp.Image(policyContext, dest, src, copyOptions)
+	if err != nil {
+		return errors.Wrapf(err, "Error copying image to the remote destination")
+	}
+	return nil
+}
+
+// MatchesID returns a bool based on if the input id
+// matches the image's id
+func (i *Image) MatchesID(id string) bool {
+	return strings.HasPrefix(i.ID(), id)
 }
 
-// pull is a temporary function for stage1 to be able to pull images during the image
-// resolution tests.  it will be replaced in stage2 with a more robust function.
-func (i *Image) pull(name string, writer io.Writer, r *libpod.Runtime) (string, error) {
-	options := libpod.CopyOptions{
-		Writer:              writer,
-		SignaturePolicyPath: r.GetConfig().SignaturePolicyPath,
+// toStorageReference returns a *storageReference from an Image
+func (i *Image) toStorageReference() (types.ImageReference, error) {
+	return is.Transport.ParseStoreReference(i.imageruntime.store, i.ID())
+}
+
+// toImageRef returns an Image Reference type from an image
+func (i *Image) toImageRef() (types.Image, error) {
+	ref, err := is.Transport.ParseStoreReference(i.imageruntime.store, "@"+i.ID())
+	if err != nil {
+		return nil, errors.Wrapf(err, "error parsing reference to image %q", i.ID())
+	}
+	imgRef, err := ref.NewImage(nil)
+	if err != nil {
+		return nil, errors.Wrapf(err, "error reading image %q", i.ID())
 	}
-	return i.runtime.PullImage(name, options)
+	return imgRef, nil
 }
 
-// Remove an image
-// This function is only complete enough for the stage 1 tests.
-func (i *Image) Remove(force bool) error {
-	_, err := i.runtime.RemoveImage(i.image, force)
-	return err
+// sizer knows its size.
+type sizer interface {
+	Size() (int64, error)
+}
+
+//Size returns the size of the image
+func (i *Image) Size() (*uint64, error) {
+	storeRef, err := is.Transport.ParseStoreReference(i.imageruntime.store, i.ID())
+	if err != nil {
+		return nil, err
+	}
+	systemContext := &types.SystemContext{}
+	img, err := storeRef.NewImageSource(systemContext)
+	if err != nil {
+		return nil, err
+	}
+	if s, ok := img.(sizer); ok {
+		if sum, err := s.Size(); err == nil {
+			usum := uint64(sum)
+			return &usum, nil
+		}
+	}
+	return nil, errors.Errorf("unable to determine size")
+
 }
diff --git a/libpod/image/image_test.go b/libpod/image/image_test.go
index 4b5b782b1..0e2f0c241 100644
--- a/libpod/image/image_test.go
+++ b/libpod/image/image_test.go
@@ -2,15 +2,12 @@ package image
 
 import (
 	"fmt"
+	"io"
 	"io/ioutil"
 	"os"
-	"path"
 	"testing"
 
 	"github.com/containers/storage"
-	"github.com/containers/storage/pkg/reexec"
-	"github.com/pkg/errors"
-	"github.com/projectatomic/libpod/libpod"
 	"github.com/stretchr/testify/assert"
 )
 
@@ -20,43 +17,9 @@ var (
 	fedoraNames  = []string{"registry.fedoraproject.org/fedora-minimal:latest", "registry.fedoraproject.org/fedora-minimal", "fedora-minimal:latest", "fedora-minimal"}
 )
 
-// setup a runtime for the tests in an alternative location on the filesystem
-func setupRuntime(workdir string) (*libpod.Runtime, error) {
-	if reexec.Init() {
-		return nil, errors.Errorf("dude")
-	}
-	sc := libpod.WithStorageConfig(storage.StoreOptions{
-		GraphRoot: workdir,
-		RunRoot:   workdir,
-	})
-	sd := libpod.WithStaticDir(path.Join(workdir, "libpod_tmp"))
-	td := libpod.WithTmpDir(path.Join(workdir, "tmpdir"))
-
-	options := []libpod.RuntimeOption{sc, sd, td}
-	return libpod.NewRuntime(options...)
-}
-
-// getImage is only used to build a test matrix for testing local images
-func getImage(r *libpod.Runtime, fqImageName string) (*storage.Image, error) {
-	img, err := NewFromLocal(fqImageName, r)
-	if err != nil {
-		return nil, err
-	}
-	return img.image, nil
-}
-
-func tagImage(r *libpod.Runtime, fqImageName, tagName string) error {
-	img, err := NewFromLocal(fqImageName, r)
-	if err != nil {
-		return err
-	}
-	r.TagImage(img.image, tagName)
-	return nil
-}
-
 type localImageTest struct {
 	fqname, taggedName string
-	img                *storage.Image
+	img                *Image
 	names              []string
 }
 
@@ -66,8 +29,11 @@ func mkWorkDir() (string, error) {
 }
 
 // shutdown the runtime and clean behind it
-func cleanup(r *libpod.Runtime, workdir string) {
-	r.Shutdown(true)
+func cleanup(workdir string, ir *Runtime) {
+	if err := ir.Shutdown(false); err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
 	err := os.RemoveAll(workdir)
 	if err != nil {
 		fmt.Println(err)
@@ -75,46 +41,27 @@ func cleanup(r *libpod.Runtime, workdir string) {
 	}
 }
 
-func makeLocalMatrix(r *libpod.Runtime) ([]localImageTest, error) {
+func makeLocalMatrix(b, bg *Image) ([]localImageTest, error) {
 	var l []localImageTest
 	// busybox
 	busybox := localImageTest{
 		fqname:     "docker.io/library/busybox:latest",
 		taggedName: "bb:latest",
 	}
-	b, err := getImage(r, busybox.fqname)
-	if err != nil {
-		return nil, err
-	}
 	busybox.img = b
-	busybox.names = bbNames
-	busybox.names = append(busybox.names, []string{"bb:latest", "bb", b.ID, b.ID[0:7], fmt.Sprintf("busybox@%s", b.Digest.String())}...)
-
-	//fedora
-	fedora := localImageTest{
-		fqname:     "registry.fedoraproject.org/fedora-minimal:latest",
-		taggedName: "f27:latest",
-	}
-	f, err := getImage(r, fedora.fqname)
-	if err != nil {
-		return nil, err
-	}
-	fedora.img = f
-	fedora.names = fedoraNames
+	busybox.names = b.Names()
+	busybox.names = append(busybox.names, []string{"bb:latest", "bb", b.ID(), b.ID()[0:7], fmt.Sprintf("busybox@%s", b.Digest())}...)
 
 	// busybox-glibc
 	busyboxGlibc := localImageTest{
 		fqname:     "docker.io/library/busybox:glibc",
 		taggedName: "bb:glibc",
 	}
-	bg, err := getImage(r, busyboxGlibc.fqname)
-	if err != nil {
-		return nil, err
-	}
+
 	busyboxGlibc.img = bg
 	busyboxGlibc.names = bbGlibcNames
 
-	l = append(l, busybox, fedora)
+	l = append(l, busybox, busyboxGlibc)
 	return l, nil
 
 }
@@ -124,32 +71,37 @@ func makeLocalMatrix(r *libpod.Runtime) ([]localImageTest, error) {
 func TestImage_NewFromLocal(t *testing.T) {
 	workdir, err := mkWorkDir()
 	assert.NoError(t, err)
-	runtime, err := setupRuntime(workdir)
-	assert.NoError(t, err)
+	so := storage.StoreOptions{
+		RunRoot:   workdir,
+		GraphRoot: workdir,
+	}
+	var writer io.Writer
+	writer = os.Stdout
 
 	// Need images to be present for this test
-	_, err = runtime.PullImage("docker.io/library/busybox:latest", libpod.CopyOptions{})
+	ir, err := NewImageRuntime(so)
 	assert.NoError(t, err)
-	_, err = runtime.PullImage("docker.io/library/busybox:glibc", libpod.CopyOptions{})
+	bb, err := ir.New("docker.io/library/busybox:latest", "", "", writer, nil, SigningOptions{})
 	assert.NoError(t, err)
-	_, err = runtime.PullImage("registry.fedoraproject.org/fedora-minimal:latest", libpod.CopyOptions{})
+	bbglibc, err := ir.New("docker.io/library/busybox:glibc", "", "", writer, nil, SigningOptions{})
 	assert.NoError(t, err)
 
-	tm, err := makeLocalMatrix(runtime)
+	tm, err := makeLocalMatrix(bb, bbglibc)
 	assert.NoError(t, err)
+
 	for _, image := range tm {
 		// tag our images
-		err = tagImage(runtime, image.fqname, image.taggedName)
+		image.img.TagImage(image.taggedName)
 		assert.NoError(t, err)
 		for _, name := range image.names {
-			newImage, err := NewFromLocal(name, runtime)
+			newImage, err := ir.NewFromLocal(name)
 			assert.NoError(t, err)
-			assert.Equal(t, newImage.ID(), image.img.ID)
+			assert.Equal(t, newImage.ID(), image.img.ID())
 		}
 	}
 
 	// Shutdown the runtime and remove the temporary storage
-	cleanup(runtime, workdir)
+	cleanup(workdir, ir)
 }
 
 // TestImage_New tests pulling the image by various names, tags, and from
@@ -158,21 +110,23 @@ func TestImage_New(t *testing.T) {
 	var names []string
 	workdir, err := mkWorkDir()
 	assert.NoError(t, err)
-	runtime, err := setupRuntime(workdir)
-	assert.NoError(t, err)
 
+	so := storage.StoreOptions{
+		RunRoot:   workdir,
+		GraphRoot: workdir,
+	}
+	ir, err := NewImageRuntime(so)
+	assert.NoError(t, err)
 	// Build the list of pull names
 	names = append(names, bbNames...)
 	names = append(names, fedoraNames...)
+	var writer io.Writer
+	writer = os.Stdout
 
 	// Iterate over the names and delete the image
 	// after the pull
 	for _, img := range names {
-		_, err := runtime.GetImage(img)
-		if err == nil {
-			os.Exit(1)
-		}
-		newImage, err := New(img, runtime)
+		newImage, err := ir.New(img, "", "", writer, nil, SigningOptions{})
 		assert.NoError(t, err)
 		assert.NotEqual(t, newImage.ID(), "")
 		err = newImage.Remove(false)
@@ -180,5 +134,5 @@ func TestImage_New(t *testing.T) {
 	}
 
 	// Shutdown the runtime and remove the temporary storage
-	cleanup(runtime, workdir)
+	cleanup(workdir, ir)
 }
diff --git a/libpod/image/parts.go b/libpod/image/parts.go
index e4ae489f9..979f223fc 100644
--- a/libpod/image/parts.go
+++ b/libpod/image/parts.go
@@ -47,6 +47,7 @@ func decompose(input string) (imageParts, error) {
 		name:        imageName,
 		tag:         tag,
 		isTagged:    isTagged,
+		transport:   DefaultTransport,
 	}, nil
 }
 
@@ -54,3 +55,8 @@ func decompose(input string) (imageParts, error) {
 func (ip *imageParts) assemble() string {
 	return fmt.Sprintf("%s/%s:%s", ip.registry, ip.name, ip.tag)
 }
+
+// assemble concatenates an image's parts with transport into a string
+func (ip *imageParts) assembleWithTransport() string {
+	return fmt.Sprintf("%s%s/%s:%s", ip.transport, ip.registry, ip.name, ip.tag)
+}
diff --git a/libpod/image/pull.go b/libpod/image/pull.go
new file mode 100644
index 000000000..52ef175d4
--- /dev/null
+++ b/libpod/image/pull.go
@@ -0,0 +1,246 @@
+package image
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"strings"
+
+	cp "github.com/containers/image/copy"
+	"github.com/containers/image/directory"
+	"github.com/containers/image/docker"
+	dockerarchive "github.com/containers/image/docker/archive"
+	"github.com/containers/image/docker/tarfile"
+	ociarchive "github.com/containers/image/oci/archive"
+	"github.com/containers/image/pkg/sysregistries"
+	is "github.com/containers/image/storage"
+	"github.com/containers/image/tarball"
+	"github.com/containers/image/transports/alltransports"
+	"github.com/containers/image/types"
+	"github.com/pkg/errors"
+)
+
+var (
+	// DockerArchive is the transport we prepend to an image name
+	// when saving to docker-archive
+	DockerArchive = dockerarchive.Transport.Name()
+	// OCIArchive is the transport we prepend to an image name
+	// when saving to oci-archive
+	OCIArchive = ociarchive.Transport.Name()
+	// DirTransport is the transport for pushing and pulling
+	// images to and from a directory
+	DirTransport = directory.Transport.Name()
+	// TransportNames are the supported transports in string form
+	TransportNames = [...]string{DefaultTransport, DockerArchive, OCIArchive, "ostree:", "dir:"}
+	// TarballTransport is the transport for importing a tar archive
+	// and creating a filesystem image
+	TarballTransport = tarball.Transport.Name()
+	// DockerTransport is the transport for docker registries
+	DockerTransport = docker.Transport.Name() + "://"
+	// AtomicTransport is the transport for atomic registries
+	AtomicTransport = "atomic"
+	// DefaultTransport is a prefix that we apply to an image name
+	DefaultTransport = DockerTransport
+)
+
+type pullStruct struct {
+	image  string
+	srcRef types.ImageReference
+	dstRef types.ImageReference
+}
+
+func (ir *Runtime) getPullStruct(srcRef types.ImageReference, destName string) (*pullStruct, error) {
+	reference := destName
+	if srcRef.DockerReference() != nil {
+		reference = srcRef.DockerReference().String()
+	}
+	destRef, err := is.Transport.ParseStoreReference(ir.store, reference)
+	if err != nil {
+		return nil, errors.Errorf("error parsing dest reference name: %v", err)
+	}
+	return &pullStruct{
+		image:  destName,
+		srcRef: srcRef,
+		dstRef: destRef,
+	}, nil
+}
+
+// returns a list of pullStruct with the srcRef and DstRef based on the transport being used
+func (ir *Runtime) getPullListFromRef(srcRef types.ImageReference, imgName string, sc *types.SystemContext) ([]*pullStruct, error) {
+	var pullStructs []*pullStruct
+	splitArr := strings.Split(imgName, ":")
+	archFile := splitArr[len(splitArr)-1]
+
+	// supports pulling from docker-archive, oci, and registries
+	if srcRef.Transport().Name() == DockerArchive {
+		tarSource, err := tarfile.NewSourceFromFile(archFile)
+		if err != nil {
+			return nil, err
+		}
+		manifest, err := tarSource.LoadTarManifest()
+
+		if err != nil {
+			return nil, errors.Errorf("error retrieving manifest.json: %v", err)
+		}
+		// to pull the first image stored in the tar file
+		if len(manifest) == 0 {
+			// use the hex of the digest if no manifest is found
+			reference, err := getImageDigest(srcRef, sc)
+			if err != nil {
+				return nil, err
+			}
+			pullInfo, err := ir.getPullStruct(srcRef, reference)
+			if err != nil {
+				return nil, err
+			}
+			pullStructs = append(pullStructs, pullInfo)
+		} else {
+			var dest string
+			if len(manifest[0].RepoTags) > 0 {
+				dest = manifest[0].RepoTags[0]
+			} else {
+				// If the input image has no repotags, we need to feed it a dest anyways
+				dest, err = getImageDigest(srcRef, sc)
+				if err != nil {
+					return nil, err
+				}
+			}
+			pullInfo, err := ir.getPullStruct(srcRef, dest)
+			if err != nil {
+				return nil, err
+			}
+			pullStructs = append(pullStructs, pullInfo)
+		}
+	} else if srcRef.Transport().Name() == OCIArchive {
+		// retrieve the manifest from index.json to access the image name
+		manifest, err := ociarchive.LoadManifestDescriptor(srcRef)
+		if err != nil {
+			return nil, errors.Wrapf(err, "error loading manifest for %q", srcRef)
+		}
+
+		if manifest.Annotations == nil || manifest.Annotations["org.opencontainers.image.ref.name"] == "" {
+			return nil, errors.Errorf("error, archive doesn't have a name annotation. Cannot store image with no name")
+		}
+		pullInfo, err := ir.getPullStruct(srcRef, manifest.Annotations["org.opencontainers.image.ref.name"])
+		if err != nil {
+			return nil, err
+		}
+		pullStructs = append(pullStructs, pullInfo)
+	} else if srcRef.Transport().Name() == DirTransport {
+		// supports pull from a directory
+		image := splitArr[1]
+		// remove leading "/"
+		if image[:1] == "/" {
+			image = image[1:]
+		}
+		pullInfo, err := ir.getPullStruct(srcRef, image)
+		if err != nil {
+			return nil, err
+		}
+		pullStructs = append(pullStructs, pullInfo)
+	} else {
+		pullInfo, err := ir.getPullStruct(srcRef, imgName)
+		if err != nil {
+			return nil, err
+		}
+		pullStructs = append(pullStructs, pullInfo)
+	}
+	return pullStructs, nil
+}
+
+// pullImage pulls an image from configured registries
+// By default, only the latest tag (or a specific tag if requested) will be
+// pulled.
+func (i *Image) pullImage(writer io.Writer, authfile, signaturePolicyPath string, signingOptions SigningOptions, dockerOptions *DockerRegistryOptions) (string, error) {
+	// pullImage copies the image from the source to the destination
+	var pullStructs []*pullStruct
+	sc := GetSystemContext(signaturePolicyPath, authfile, false)
+	srcRef, err := alltransports.ParseImageName(i.InputName)
+	if err != nil {
+		// could be trying to pull from registry with short name
+		pullStructs, err = i.createNamesToPull()
+		if err != nil {
+			return "", errors.Wrap(err, "error getting default registries to try")
+		}
+	} else {
+		pullStructs, err = i.imageruntime.getPullListFromRef(srcRef, i.InputName, sc)
+		if err != nil {
+			return "", errors.Wrapf(err, "error getting pullStruct info to pull image %q", i.InputName)
+		}
+	}
+	policyContext, err := getPolicyContext(sc)
+	if err != nil {
+		return "", err
+	}
+	defer policyContext.Destroy()
+
+	copyOptions := getCopyOptions(writer, signaturePolicyPath, dockerOptions, nil, signingOptions, authfile, "", false)
+	for _, imageInfo := range pullStructs {
+		// Print the following statement only when pulling from a docker or atomic registry
+		if writer != nil && (imageInfo.srcRef.Transport().Name() == DockerTransport || imageInfo.srcRef.Transport().Name() == AtomicTransport) {
+			io.WriteString(writer, fmt.Sprintf("Trying to pull %s...\n", imageInfo.image))
+		}
+		if err = cp.Image(policyContext, imageInfo.dstRef, imageInfo.srcRef, copyOptions); err != nil {
+			if writer != nil {
+				io.WriteString(writer, "Failed\n")
+			}
+		} else {
+			return imageInfo.image, nil
+		}
+	}
+	return "", errors.Wrapf(err, "error pulling image from")
+}
+
+// createNamesToPull looks at a decomposed image and determines the possible
+// images names to try pulling in combination with the registries.conf file as well
+func (i *Image) createNamesToPull() ([]*pullStruct, error) {
+	var pullNames []*pullStruct
+	decomposedImage, err := decompose(i.InputName)
+	if err != nil {
+		return nil, err
+	}
+	if decomposedImage.hasRegistry {
+		srcRef, err := alltransports.ParseImageName(decomposedImage.assembleWithTransport())
+		if err != nil {
+			return nil, errors.Errorf("unable to parse '%s'", i.InputName)
+		}
+		ps := pullStruct{
+			image:  i.InputName,
+			srcRef: srcRef,
+		}
+		pullNames = append(pullNames, &ps)
+
+	} else {
+		registryConfigPath := ""
+		envOverride := os.Getenv("REGISTRIES_CONFIG_PATH")
+		if len(envOverride) > 0 {
+			registryConfigPath = envOverride
+		}
+		searchRegistries, err := sysregistries.GetRegistries(&types.SystemContext{SystemRegistriesConfPath: registryConfigPath})
+		if err != nil {
+			return nil, err
+		}
+		for _, registry := range searchRegistries {
+			decomposedImage.registry = registry
+			srcRef, err := alltransports.ParseImageName(decomposedImage.assembleWithTransport())
+			if err != nil {
+				return nil, errors.Errorf("unable to parse '%s'", i.InputName)
+			}
+			ps := pullStruct{
+				image:  decomposedImage.assemble(),
+				srcRef: srcRef,
+			}
+			pullNames = append(pullNames, &ps)
+		}
+	}
+
+	for _, pStruct := range pullNames {
+		destRef, err := is.Transport.ParseStoreReference(i.imageruntime.store, pStruct.image)
+		if err != nil {
+			return nil, errors.Errorf("error parsing dest reference name: %v", err)
+		}
+		pStruct.dstRef = destRef
+	}
+
+	return pullNames, nil
+}
diff --git a/libpod/image/signing_options.go b/libpod/image/signing_options.go
new file mode 100644
index 000000000..f310da749
--- /dev/null
+++ b/libpod/image/signing_options.go
@@ -0,0 +1,10 @@
+package image
+
+// SigningOptions encapsulates settings that control whether or not we strip or
+// add signatures to images when writing them.
+type SigningOptions struct {
+	// RemoveSignatures directs us to remove any signatures which are already present.
+	RemoveSignatures bool
+	// SignBy is a key identifier of some kind, indicating that a signature should be generated using the specified private key and stored with the image.
+	SignBy string
+}
diff --git a/libpod/image/utils.go b/libpod/image/utils.go
index f312c8e4d..adc795e3a 100644
--- a/libpod/image/utils.go
+++ b/libpod/image/utils.go
@@ -1,9 +1,16 @@
 package image
 
 import (
+	"io"
+
+	cp "github.com/containers/image/copy"
 	"github.com/containers/image/docker/reference"
 	"github.com/containers/storage"
 	"github.com/pkg/errors"
+
+	"github.com/containers/image/signature"
+	"github.com/containers/image/types"
+	"strings"
 )
 
 func getTags(nameInput string) (reference.NamedTagged, bool, error) {
@@ -18,17 +25,17 @@ func getTags(nameInput string) (reference.NamedTagged, bool, error) {
 
 // findImageInRepotags takes an imageParts struct and searches images' repotags for
 // a match on name:tag
-func findImageInRepotags(search imageParts, images []*storage.Image) (*storage.Image, error) {
+func findImageInRepotags(search imageParts, images []*Image) (*storage.Image, error) {
 	var results []*storage.Image
 	for _, image := range images {
-		for _, name := range image.Names {
+		for _, name := range image.Names() {
 			d, err := decompose(name)
 			// if we get an error, ignore and keep going
 			if err != nil {
 				continue
 			}
 			if d.name == search.name && d.tag == search.tag {
-				results = append(results, image)
+				results = append(results, image.image)
 				break
 			}
 		}
@@ -40,3 +47,42 @@ func findImageInRepotags(search imageParts, images []*storage.Image) (*storage.I
 	}
 	return results[0], nil
 }
+
+// getCopyOptions constructs a new containers/image/copy.Options{} struct from the given parameters
+func getCopyOptions(reportWriter io.Writer, signaturePolicyPath string, srcDockerRegistry, destDockerRegistry *DockerRegistryOptions, signing SigningOptions, authFile, manifestType string, forceCompress bool) *cp.Options {
+	if srcDockerRegistry == nil {
+		srcDockerRegistry = &DockerRegistryOptions{}
+	}
+	if destDockerRegistry == nil {
+		destDockerRegistry = &DockerRegistryOptions{}
+	}
+	srcContext := srcDockerRegistry.GetSystemContext(signaturePolicyPath, authFile, forceCompress)
+	destContext := destDockerRegistry.GetSystemContext(signaturePolicyPath, authFile, forceCompress)
+	return &cp.Options{
+		RemoveSignatures:      signing.RemoveSignatures,
+		SignBy:                signing.SignBy,
+		ReportWriter:          reportWriter,
+		SourceCtx:             srcContext,
+		DestinationCtx:        destContext,
+		ForceManifestMIMEType: manifestType,
+	}
+}
+
+// getPolicyContext sets up, intializes and returns a new context for the specified policy
+func getPolicyContext(ctx *types.SystemContext) (*signature.PolicyContext, error) {
+	policy, err := signature.DefaultPolicy(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	policyContext, err := signature.NewPolicyContext(policy)
+	if err != nil {
+		return nil, err
+	}
+	return policyContext, nil
+}
+
+// hasTransport determines if the image string contains '://', returns bool
+func hasTransport(image string) bool {
+	return strings.Contains(image, "://")
+}
diff --git a/libpod/runtime_img.go b/libpod/runtime_img.go
index 53d39ffca..fe9864dca 100644
--- a/libpod/runtime_img.go
+++ b/libpod/runtime_img.go
@@ -29,6 +29,7 @@ import (
 	"github.com/projectatomic/libpod/libpod/common"
 	"github.com/projectatomic/libpod/libpod/driver"
 	"github.com/projectatomic/libpod/pkg/inspect"
+	"github.com/projectatomic/libpod/pkg/util"
 )
 
 // Runtime API
@@ -312,7 +313,7 @@ func (k *Image) Decompose() error {
 		if err != nil {
 			return nil
 		}
-		if StringInSlice(k.Registry, registries) {
+		if util.StringInSlice(k.Registry, registries) {
 			return nil
 		}
 		// We need to check if the registry name is legit
diff --git a/libpod/util.go b/libpod/util.go
index ca93fc097..c258af307 100644
--- a/libpod/util.go
+++ b/libpod/util.go
@@ -39,16 +39,6 @@ func WriteFile(content string, path string) error {
 	return nil
 }
 
-// StringInSlice determines if a string is in a string slice, returns bool
-func StringInSlice(s string, sl []string) bool {
-	for _, i := range sl {
-		if i == s {
-			return true
-		}
-	}
-	return false
-}
-
 // FuncTimer helps measure the execution time of a function
 // For debug purposes, do not leave in code
 // used like defer FuncTimer("foo")
diff --git a/libpod/util_test.go b/libpod/util_test.go
index 7b9d19a43..70e989e1a 100644
--- a/libpod/util_test.go
+++ b/libpod/util_test.go
@@ -5,19 +5,6 @@ import (
 	"testing"
 )
 
-var (
-	sliceData = []string{"one", "two", "three", "four"}
-)
-
-func TestStringInSlice(t *testing.T) {
-	// string is in the slice
-	assert.True(t, StringInSlice("one", sliceData))
-	// string is not in the slice
-	assert.False(t, StringInSlice("five", sliceData))
-	// string is not in empty slice
-	assert.False(t, StringInSlice("one", []string{}))
-}
-
 func TestRemoveScientificNotationFromFloat(t *testing.T) {
 	numbers := []float64{0.0, .5, 1.99999932, 1.04e+10}
 	results := []float64{0.0, .5, 1.99999932, 1.04}
diff --git a/pkg/util/utils.go b/pkg/util/utils.go
index 9a93021e4..edcf63f80 100644
--- a/pkg/util/utils.go
+++ b/pkg/util/utils.go
@@ -44,3 +44,13 @@ func ParseRegistryCreds(creds string) (*types.DockerAuthConfig, error) {
 		Password: password,
 	}, nil
 }
+
+// StringInSlice determines if a string is in a string slice, returns bool
+func StringInSlice(s string, sl []string) bool {
+	for _, i := range sl {
+		if i == s {
+			return true
+		}
+	}
+	return false
+}
diff --git a/pkg/util/utils_test.go b/pkg/util/utils_test.go
new file mode 100644
index 000000000..f47c0b7ad
--- /dev/null
+++ b/pkg/util/utils_test.go
@@ -0,0 +1,19 @@
+package util
+
+import (
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+var (
+	sliceData = []string{"one", "two", "three", "four"}
+)
+
+func TestStringInSlice(t *testing.T) {
+	// string is in the slice
+	assert.True(t, StringInSlice("one", sliceData))
+	// string is not in the slice
+	assert.False(t, StringInSlice("five", sliceData))
+	// string is not in empty slice
+	assert.False(t, StringInSlice("one", []string{}))
+}