search: allow wildcards

Allow wildcards in the search term.  Note that not all registries
support wildcards and it may only work with v1 registries.

Note that searching implies figuring out if the specified search term
includes a registry.  If there's not registry detected, the search term
will be used against all configured "unqualified-serach-registries" in
the registries.conf.  The parsing logic considers a registry to be the
substring before the first slash `/`.

With these changes we now not only support wildcards but arbitrary
input; ultimately it's up to the registries to decide whether they
support given input or not.

Fixes: bugzilla.redhat.com/show_bug.cgi?id=1846629
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

libpod/image/search.go

@@ -64,13 +64,16 @@ type SearchFilter struct {
 // SearchImages searches images based on term and the specified SearchOptions
 // in all registries.
 func SearchImages(term string, options SearchOptions) ([]SearchResult, error) {
-	// Check if search term has a registry in it
+	registry := ""
-	registry, err := sysreg.GetRegistry(term)
+
-	if err != nil {
+	// Try to extract a registry from the specified search term.  We
-		return nil, errors.Wrapf(err, "error getting registry from %q", term)
+	// consider everything before the first slash to be the registry.  Note
-	}
+	// that we cannot use the reference parser from the containers/image
-	if registry != "" {
+	// library as the search term may container arbitrary input such as
-		term = term[len(registry)+1:]
+	// wildcards.  See bugzilla.redhat.com/show_bug.cgi?id=1846629.
+	if spl := strings.SplitN(term, "/", 2); len(spl) > 1 {
+		registry = spl[0]
+		term = spl[1]
 	}
 
 	registries, err := getRegistries(registry)

pkg/registries/registries.go

@@ -3,12 +3,10 @@ package registries
 import (
 	"os"
 	"path/filepath"
-	"strings"
 
 	"github.com/containers/image/v5/pkg/sysregistriesv2"
 	"github.com/containers/image/v5/types"
 	"github.com/containers/libpod/pkg/rootless"
-	"github.com/docker/distribution/reference"
 	"github.com/pkg/errors"
 )
 
@@ -77,17 +75,3 @@ func GetInsecureRegistries() ([]string, error) {
 	}
 	return insecureRegistries, nil
 }
-
-// GetRegistry returns the registry name from a string if specified
-func GetRegistry(image string) (string, error) {
-	// It is possible to only have the registry name in the format "myregistry/"
-	// if so, just trim the "/" from the end and return the registry name
-	if strings.HasSuffix(image, "/") {
-		return strings.TrimSuffix(image, "/"), nil
-	}
-	imgRef, err := reference.Parse(image)
-	if err != nil {
-		return "", err
-	}
-	return reference.Domain(imgRef.(reference.Named)), nil
-}

test/e2e/search_test.go

@@ -400,4 +400,16 @@ registries = ['{{.Host}}:{{.Port}}']`
 		search.WaitWithDefaultTimeout()
 		Expect(search.ExitCode()).To(Not(Equal(0)))
 	})
+
+	It("podman search with wildcards", func() {
+		search := podmanTest.Podman([]string{"search", "--limit", "30", "registry.redhat.io/*"})
+		search.WaitWithDefaultTimeout()
+		Expect(search.ExitCode()).To(Equal(0))
+		Expect(len(search.OutputToStringArray())).To(Equal(31))
+
+		search = podmanTest.Podman([]string{"search", "registry.redhat.io/*openshift*"})
+		search.WaitWithDefaultTimeout()
+		Expect(search.ExitCode()).To(Equal(0))
+		Expect(len(search.OutputToStringArray()) > 1).To(BeTrue())
+	})
 })