libimage: search: add options for authentication

When we searching any image at a container registry,
the authentication could be required as well as push, pull, etc.

Signed-off-by: Toshiki Sonoda <sonoda.toshiki@fujitsu.com>

libimage/search.go

@@ -2,6 +2,7 @@ package libimage
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"strconv"
 	"strings"
@@ -54,6 +55,16 @@ type SearchOptions struct {
 	NoTrunc bool
 	// Authfile is the path to the authentication file.
 	Authfile string
+	// Path to the certificates directory.
+	CertDirPath string
+	// Username to use when authenticating at a container registry.
+	Username string
+	// Password to use when authenticating at a container registry.
+	Password string
+	// Credentials is an alternative way to specify credentials in format
+	// "username[:password]".  Cannot be used in combination with
+	// Username/Password.
+	Credentials string
 	// InsecureSkipTLSVerify allows to skip TLS verification.
 	InsecureSkipTLSVerify types.OptionalBool
 	// ListTags returns the search result with available tags
@@ -201,6 +212,31 @@ func (r *Runtime) searchImageInRegistry(ctx context.Context, term, registry stri
 		sys.AuthFilePath = options.Authfile
 	}
 
+	if options.CertDirPath != "" {
+	        sys.DockerCertPath = options.CertDirPath
+	}
+
+	authConf := &types.DockerAuthConfig{}
+	if options.Username != "" {
+	        if options.Credentials != "" {
+	                return nil, errors.New("username/password cannot be used with credentials")
+	        }
+	        authConf.Username = options.Username
+	        authConf.Password = options.Password
+	}
+
+	if options.Credentials != "" {
+	        split := strings.SplitN(options.Credentials, ":", 2)
+	        switch len(split) {
+	        case 1:
+	                authConf.Username = split[0]
+	        default:
+	                authConf.Username = split[0]
+	                authConf.Password = split[1]
+	        }
+	}
+	sys.DockerAuthConfig = authConf
+
 	if options.ListTags {
 		results, err := searchRepositoryTags(ctx, sys, registry, term, options)
 		if err != nil {