migrate Podman to containers/common/libimage

Migrate the Podman code base over to `common/libimage` which replaces
`libpod/image` and a lot of glue code entirely.

Note that I tried to leave bread crumbs for changed tests.

Miscellaneous changes:

 * Some errors yield different messages which required to alter some
   tests.

 * I fixed some pre-existing issues in the code.  Others were marked as
   `//TODO`s to prevent the PR from exploding.

 * The `NamesHistory` of an image is returned as is from the storage.
   Previously, we did some filtering which I think is undesirable.
   Instead we should return the data as stored in the storage.

 * Touched handlers use the ABI interfaces where possible.

 * Local image resolution: previously Podman would match "foo" on
   "myfoo".  This behaviour has been changed and Podman will now
   only match on repository boundaries such that "foo" would match
   "my/foo" but not "myfoo".  I consider the old behaviour to be a
   bug, at the very least an exotic corner case.

 * Futhermore, "foo:none" does *not* resolve to a local image "foo"
   without tag anymore.  It's a hill I am (almost) willing to die on.

 * `image prune` prints the IDs of pruned images.  Previously, in some
   cases, the names were printed instead.  The API clearly states ID,
   so we should stick to it.

 * Compat endpoint image removal with _force_ deletes the entire not
   only the specified tag.

Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

4 files changed, 38 insertions, 12 deletions

diff --git a/cmd/podman/common/createparse.go b/cmd/podman/common/createparse.go
index 818cd0bbd..dcef1a151 100644
--- a/cmd/podman/common/createparse.go
+++ b/cmd/podman/common/createparse.go
@@ -1,7 +1,7 @@
 package common
 
 import (
-	"github.com/containers/podman/v3/pkg/util"
+	"github.com/containers/common/pkg/config"
 	"github.com/pkg/errors"
 )
 
@@ -13,7 +13,7 @@ func (c *ContainerCLIOpts) validate() error {
 		return errors.Errorf(`the --rm option conflicts with --restart, when the restartPolicy is not "" and "no"`)
 	}
 
-	if _, err := util.ValidatePullType(c.Pull); err != nil {
+	if _, err := config.ParsePullPolicy(c.Pull); err != nil {
 		return err
 	}
 
diff --git a/cmd/podman/containers/create.go b/cmd/podman/containers/create.go
index 3f495e19b..f06869c4e 100644
--- a/cmd/podman/containers/create.go
+++ b/cmd/podman/containers/create.go
@@ -8,15 +8,15 @@ import (
 	"strings"
 
 	"github.com/containers/common/pkg/config"
-	"github.com/containers/image/v5/storage"
+	storageTransport "github.com/containers/image/v5/storage"
 	"github.com/containers/image/v5/transports/alltransports"
 	"github.com/containers/podman/v3/cmd/podman/common"
 	"github.com/containers/podman/v3/cmd/podman/registry"
 	"github.com/containers/podman/v3/cmd/podman/utils"
-	"github.com/containers/podman/v3/libpod/define"
 	"github.com/containers/podman/v3/pkg/domain/entities"
 	"github.com/containers/podman/v3/pkg/specgen"
 	"github.com/containers/podman/v3/pkg/util"
+	"github.com/containers/storage"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
@@ -238,6 +238,8 @@ func createInit(c *cobra.Command) error {
 	return nil
 }
 
+// TODO: we should let the backend take care of the pull policy (which it
+// does!). The code below is at risk of causing regression and code divergence.
 func pullImage(imageName string) (string, error) {
 	pullPolicy, err := config.ValidatePullPolicy(cliVals.Pull)
 	if err != nil {
@@ -252,7 +254,7 @@ func pullImage(imageName string) (string, error) {
 		// Assume we specified a local image without the explicit storage transport.
 		fallthrough
 
-	case imageRef.Transport().Name() == storage.Transport.Name():
+	case imageRef.Transport().Name() == storageTransport.Transport.Name():
 		br, err := registry.ImageEngine().Exists(registry.GetContext(), imageName)
 		if err != nil {
 			return "", err
@@ -272,15 +274,15 @@ func pullImage(imageName string) (string, error) {
 			}
 		}
 
-		if pullPolicy != config.PullImageAlways {
+		if pullPolicy != config.PullPolicyAlways {
 			logrus.Info("--platform --arch and --os causes the pull policy to be \"always\"")
-			pullPolicy = config.PullImageAlways
+			pullPolicy = config.PullPolicyAlways
 		}
 	}
 
-	if imageMissing || pullPolicy == config.PullImageAlways {
-		if pullPolicy == config.PullImageNever {
-			return "", errors.Wrapf(define.ErrNoSuchImage, "unable to find a name and tag match for %s in repotags", imageName)
+	if imageMissing || pullPolicy == config.PullPolicyAlways {
+		if pullPolicy == config.PullPolicyNever {
+			return "", errors.Wrap(storage.ErrImageUnknown, imageName)
 		}
 		pullReport, pullErr := registry.ImageEngine().Pull(registry.GetContext(), imageName, entities.ImagePullOptions{
 			Authfile:        cliVals.Authfile,
diff --git a/cmd/podman/images/trust_set.go b/cmd/podman/images/trust_set.go
index 6333512d9..c192669a9 100644
--- a/cmd/podman/images/trust_set.go
+++ b/cmd/podman/images/trust_set.go
@@ -1,10 +1,12 @@
 package images
 
 import (
+	"net/url"
+	"regexp"
+
 	"github.com/containers/common/pkg/completion"
 	"github.com/containers/podman/v3/cmd/podman/common"
 	"github.com/containers/podman/v3/cmd/podman/registry"
-	"github.com/containers/podman/v3/libpod/image"
 	"github.com/containers/podman/v3/pkg/domain/entities"
 	"github.com/containers/podman/v3/pkg/util"
 	"github.com/pkg/errors"
@@ -53,7 +55,7 @@ File(s) must exist before using this command`)
 func setTrust(cmd *cobra.Command, args []string) error {
 	validTrustTypes := []string{"accept", "insecureAcceptAnything", "reject", "signedBy"}
 
-	valid, err := image.IsValidImageURI(args[0])
+	valid, err := isValidImageURI(args[0])
 	if err != nil || !valid {
 		return err
 	}
@@ -63,3 +65,23 @@ func setTrust(cmd *cobra.Command, args []string) error {
 	}
 	return registry.ImageEngine().SetTrust(registry.Context(), args, setOptions)
 }
+
+// isValidImageURI checks if image name has valid format
+func isValidImageURI(imguri string) (bool, error) {
+	uri := "http://" + imguri
+	u, err := url.Parse(uri)
+	if err != nil {
+		return false, errors.Wrapf(err, "invalid image uri: %s", imguri)
+	}
+	reg := regexp.MustCompile(`^[a-zA-Z0-9-_\.]+\/?:?[0-9]*[a-z0-9-\/:]*$`)
+	ret := reg.FindAllString(u.Host, -1)
+	if len(ret) == 0 {
+		return false, errors.Wrapf(err, "invalid image uri: %s", imguri)
+	}
+	reg = regexp.MustCompile(`^[a-z0-9-:\./]*$`)
+	ret = reg.FindAllString(u.Fragment, -1)
+	if len(ret) == 0 {
+		return false, errors.Wrapf(err, "invalid image uri: %s", imguri)
+	}
+	return true, nil
+}
diff --git a/cmd/podman/manifest/add.go b/cmd/podman/manifest/add.go
index 82e155909..2499dc2e8 100644
--- a/cmd/podman/manifest/add.go
+++ b/cmd/podman/manifest/add.go
@@ -94,6 +94,8 @@ func add(cmd *cobra.Command, args []string) error {
 		return err
 	}
 
+	// FIXME: (@vrothberg) this interface confuses me a lot.  Why are they
+	// not two arguments?
 	manifestAddOpts.Images = []string{args[1], args[0]}
 
 	if manifestAddOpts.CredentialsCLI != "" {