podmanV2: implement search

Also implement a new libpod endpoint to add more parameters and to
prevent us from converting between slices and maps and make use of
the filter parsing in the image backend.

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

1 files changed, 157 insertions, 0 deletions

diff --git a/cmd/podmanV2/images/search.go b/cmd/podmanV2/images/search.go
new file mode 100644
index 000000000..2ab9735ec
--- /dev/null
+++ b/cmd/podmanV2/images/search.go
@@ -0,0 +1,157 @@
+package images
+
+import (
+	"reflect"
+	"strings"
+
+	buildahcli "github.com/containers/buildah/pkg/cli"
+	"github.com/containers/buildah/pkg/formats"
+	"github.com/containers/image/v5/types"
+	"github.com/containers/libpod/cmd/podmanV2/registry"
+	"github.com/containers/libpod/pkg/domain/entities"
+	"github.com/containers/libpod/pkg/util/camelcase"
+	"github.com/pkg/errors"
+	"github.com/spf13/cobra"
+	"github.com/spf13/pflag"
+)
+
+// searchOptionsWrapper wraps entities.ImagePullOptions and prevents leaking
+// CLI-only fields into the API types.
+type searchOptionsWrapper struct {
+	entities.ImageSearchOptions
+	// CLI only flags
+	TLSVerifyCLI bool   // Used to convert to an optional bool later
+	Format       string // For go templating
+}
+
+var (
+	searchOptions     = searchOptionsWrapper{}
+	searchDescription = `Search registries for a given image. Can search all the default registries or a specific registry.
+
+	Users can limit the number of results, and filter the output based on certain conditions.`
+
+	// Command: podman search
+	searchCmd = &cobra.Command{
+		Use:     "search [flags] TERM",
+		Short:   "Search registry for image",
+		Long:    searchDescription,
+		PreRunE: preRunE,
+		RunE:    imageSearch,
+		Args:    cobra.ExactArgs(1),
+		Example: `podman search --filter=is-official --limit 3 alpine
+  podman search registry.fedoraproject.org/  # only works with v2 registries
+  podman search --format "table {{.Index}} {{.Name}}" registry.fedoraproject.org/fedora`,
+	}
+
+	// Command: podman image search
+	imageSearchCmd = &cobra.Command{
+		Use:     searchCmd.Use,
+		Short:   searchCmd.Short,
+		Long:    searchCmd.Long,
+		PreRunE: searchCmd.PreRunE,
+		RunE:    searchCmd.RunE,
+		Args:    searchCmd.Args,
+		Example: `podman image search --filter=is-official --limit 3 alpine
+		podman image search registry.fedoraproject.org/  # only works with v2 registries
+		podman image search --format "table {{.Index}} {{.Name}}" registry.fedoraproject.org/fedora`,
+	}
+)
+
+func init() {
+	// search
+	registry.Commands = append(registry.Commands, registry.CliCommand{
+		Mode:    []entities.EngineMode{entities.ABIMode, entities.TunnelMode},
+		Command: searchCmd,
+	})
+
+	searchCmd.SetHelpTemplate(registry.HelpTemplate())
+	searchCmd.SetUsageTemplate(registry.UsageTemplate())
+	flags := searchCmd.Flags()
+	searchFlags(flags)
+
+	// images search
+	registry.Commands = append(registry.Commands, registry.CliCommand{
+		Mode:    []entities.EngineMode{entities.ABIMode, entities.TunnelMode},
+		Command: imageSearchCmd,
+		Parent:  imageCmd,
+	})
+
+	imageSearchFlags := imageSearchCmd.Flags()
+	searchFlags(imageSearchFlags)
+}
+
+// searchFlags set the flags for the pull command.
+func searchFlags(flags *pflag.FlagSet) {
+	flags.StringSliceVarP(&searchOptions.Filters, "filter", "f", []string{}, "Filter output based on conditions provided (default [])")
+	flags.StringVar(&searchOptions.Format, "format", "", "Change the output format to a Go template")
+	flags.IntVar(&searchOptions.Limit, "limit", 0, "Limit the number of results")
+	flags.BoolVar(&searchOptions.NoTrunc, "no-trunc", false, "Do not truncate the output")
+	flags.StringVar(&searchOptions.Authfile, "authfile", buildahcli.GetDefaultAuthFile(), "Path of the authentication file. Use REGISTRY_AUTH_FILE environment variable to override")
+	flags.BoolVar(&searchOptions.TLSVerifyCLI, "tls-verify", true, "Require HTTPS and verify certificates when contacting registries")
+	if registry.IsRemote() {
+		_ = flags.MarkHidden("authfile")
+		_ = flags.MarkHidden("tls-verify")
+	}
+}
+
+// imageSearch implements the command for searching images.
+func imageSearch(cmd *cobra.Command, args []string) error {
+	searchTerm := ""
+	switch len(args) {
+	case 1:
+		searchTerm = args[0]
+	default:
+		return errors.Errorf("search requires exactly one argument")
+	}
+
+	sarchOptsAPI := searchOptions.ImageSearchOptions
+	// TLS verification in c/image is controlled via a `types.OptionalBool`
+	// which allows for distinguishing among set-true, set-false, unspecified
+	// which is important to implement a sane way of dealing with defaults of
+	// boolean CLI flags.
+	if cmd.Flags().Changed("tls-verify") {
+		sarchOptsAPI.TLSVerify = types.NewOptionalBool(pullOptions.TLSVerifyCLI)
+	}
+
+	searchReport, err := registry.ImageEngine().Search(registry.GetContext(), searchTerm, sarchOptsAPI)
+	if err != nil {
+		return err
+	}
+
+	format := genSearchFormat(searchOptions.Format)
+	if len(searchReport) == 0 {
+		return nil
+	}
+	out := formats.StdoutTemplateArray{Output: searchToGeneric(searchReport), Template: format, Fields: searchHeaderMap()}
+	return out.Out()
+}
+
+// searchHeaderMap returns the headers of a SearchResult.
+func searchHeaderMap() map[string]string {
+	s := new(entities.ImageSearchReport)
+	v := reflect.Indirect(reflect.ValueOf(s))
+	values := make(map[string]string, v.NumField())
+
+	for i := 0; i < v.NumField(); i++ {
+		key := v.Type().Field(i).Name
+		value := key
+		values[key] = strings.ToUpper(strings.Join(camelcase.Split(value), " "))
+	}
+	return values
+}
+
+func genSearchFormat(format string) string {
+	if format != "" {
+		// "\t" from the command line is not being recognized as a tab
+		// replacing the string "\t" to a tab character if the user passes in "\t"
+		return strings.Replace(format, `\t`, "\t", -1)
+	}
+	return "table {{.Index}}\t{{.Name}}\t{{.Description}}\t{{.Stars}}\t{{.Official}}\t{{.Automated}}\t"
+}
+
+func searchToGeneric(params []entities.ImageSearchReport) (genericParams []interface{}) {
+	for _, v := range params {
+		genericParams = append(genericParams, interface{}(v))
+	}
+	return genericParams
+}