refactor command package to remove globals and add dependency injection

cmd/syft/cli/attest.go

@@ -0,0 +1,69 @@
+package cli
+
+import (
+	"fmt"
+	"log"
+
+	"github.com/anchore/syft/cmd/syft/cli/attest"
+	"github.com/anchore/syft/cmd/syft/cli/options"
+	"github.com/anchore/syft/internal"
+	"github.com/anchore/syft/internal/config"
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+)
+
+const (
+	attestExample = `  {{.appName}} {{.command}} --output [FORMAT] --key [KEY] alpine:latest
+  Supports the following image sources:
+    {{.appName}} {{.command}} --key [KEY] yourrepo/yourimage:tag     defaults to using images from a Docker daemon. If Docker is not present, the image is pulled directly from the registry.
+    {{.appName}} {{.command}} --key [KEY] path/to/a/file/or/dir      only for OCI tar or OCI directory
+`
+	attestSchemeHelp = "\n" + indent + schemeHelpHeader + "\n" + imageSchemeHelp
+
+	attestHelp = attestExample + attestSchemeHelp
+)
+
+func Attest(v *viper.Viper, app *config.Application, ro *options.RootOptions) *cobra.Command {
+	ao := options.AttestOptions{}
+	cmd := &cobra.Command{
+		Use:   "attest --output [FORMAT] --key [KEY] [SOURCE]",
+		Short: "Generate a package SBOM as an attestation for the given [SOURCE] container image",
+		Long:  "Generate a packaged-based Software Bill Of Materials (SBOM) from a container image as the predicate of an in-toto attestation",
+		Example: internal.Tprintf(attestHelp, map[string]interface{}{
+			"appName": internal.ApplicationName,
+			"command": "attest",
+		}),
+		Args: func(cmd *cobra.Command, args []string) error {
+			// run to unmarshal viper object onto app config
+			// the viper object correctly
+			if err := app.LoadAllValues(v, ro.Config); err != nil {
+				return fmt.Errorf("invalid application config: %v", err)
+			}
+			// configure logging for command
+			newLogWrapper(app)
+			logApplicationConfig(app)
+			return validateArgs(cmd, args)
+		},
+		SilenceUsage:  true,
+		SilenceErrors: true,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			// this MUST be called first to make sure app config decodes
+			// the viper object correctly
+			newLogWrapper(app)
+			logApplicationConfig(app)
+
+			if app.CheckForAppUpdate {
+				checkForApplicationUpdate()
+			}
+
+			return attest.Run(cmd.Context(), app, args)
+		},
+	}
+
+	err := ao.AddFlags(cmd, v)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	return cmd
+}

cmd/syft/cli/attest/attest.go

@@ -0,0 +1,216 @@
+package attest
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/anchore/stereoscope"
+	"github.com/anchore/stereoscope/pkg/image"
+	"github.com/anchore/syft/cmd/syft/cli/eventloop"
+	"github.com/anchore/syft/cmd/syft/cli/options"
+	"github.com/anchore/syft/cmd/syft/cli/packages"
+	"github.com/anchore/syft/internal/bus"
+	"github.com/anchore/syft/internal/config"
+	"github.com/anchore/syft/internal/formats/cyclonedxjson"
+	"github.com/anchore/syft/internal/formats/spdx22json"
+	"github.com/anchore/syft/internal/formats/syftjson"
+	"github.com/anchore/syft/internal/ui"
+	"github.com/anchore/syft/syft"
+	"github.com/anchore/syft/syft/event"
+	"github.com/anchore/syft/syft/sbom"
+	"github.com/anchore/syft/syft/source"
+	"github.com/in-toto/in-toto-golang/in_toto"
+	"github.com/pkg/errors"
+	"github.com/sigstore/cosign/cmd/cosign/cli/sign"
+	"github.com/sigstore/cosign/pkg/cosign/attestation"
+	"github.com/sigstore/sigstore/pkg/signature/dsse"
+	"github.com/wagoodman/go-partybus"
+
+	signatureoptions "github.com/sigstore/sigstore/pkg/signature/options"
+)
+
+var (
+	allowedAttestFormats = []sbom.FormatID{
+		syftjson.ID,
+		spdx22json.ID,
+		cyclonedxjson.ID,
+	}
+
+	intotoJSONDsseType = `application/vnd.in-toto+json`
+)
+
+func Run(ctx context.Context, app *config.Application, args []string) error {
+	// We cannot generate an attestation for more than one output
+	if len(app.Outputs) > 1 {
+		return fmt.Errorf("unable to generate attestation for more than one output")
+	}
+
+	// can only be an image for attestation or OCI DIR
+	userInput := args[0]
+	si, err := parseImageSource(userInput, app)
+	if err != nil {
+		return err
+	}
+
+	format := syft.FormatByName(app.Outputs[0])
+	predicateType := formatPredicateType(format)
+	if predicateType == "" {
+		return fmt.Errorf("could not produce attestation predicate for given format: %q. Available formats: %+v", options.FormatAliases(format.ID()), options.FormatAliases(allowedAttestFormats...))
+	}
+
+	passFunc, err := selectPassFunc(app.Attest.Key, app.Attest.Password)
+	if err != nil {
+		return err
+	}
+
+	ko := sign.KeyOpts{
+		KeyRef:   app.Attest.Key,
+		PassFunc: passFunc,
+	}
+
+	sv, err := sign.SignerFromKeyOpts(ctx, "", "", ko)
+	if err != nil {
+		return err
+	}
+	defer sv.Close()
+
+	eventBus := partybus.NewBus()
+	stereoscope.SetBus(eventBus)
+	syft.SetBus(eventBus)
+
+	return eventloop.EventLoop(
+		execWorker(app, *si, format, predicateType, sv),
+		eventloop.SetupSignals(),
+		eventBus.Subscribe(),
+		stereoscope.Cleanup,
+		ui.Select(options.IsVerbose(app), app.Quiet)...,
+	)
+}
+
+func parseImageSource(userInput string, app *config.Application) (s *source.Input, err error) {
+	si, err := source.ParseInput(userInput, app.Platform, false)
+	if err != nil {
+		return nil, fmt.Errorf("could not generate source input for attest command: %w", err)
+	}
+
+	switch si.Scheme {
+	case source.ImageScheme, source.UnknownScheme:
+		// at this point we know that it cannot be dir: or file: schemes;
+		// we will assume that the unknown scheme could represent an image;
+		si.Scheme = source.ImageScheme
+	default:
+		return nil, fmt.Errorf("attest command can only be used with image sources but discovered %q when given %q", si.Scheme, userInput)
+	}
+
+	// if the original detection was from the local daemon we want to short circuit
+	// that and attempt to generate the image source from its current registry source instead
+	switch si.ImageSource {
+	case image.UnknownSource, image.OciRegistrySource:
+		si.ImageSource = image.OciRegistrySource
+	default:
+		return nil, fmt.Errorf("attest command can only be used with image sources fetch directly from the registry, but discovered an image source of %q when given %q", si.ImageSource, userInput)
+	}
+
+	return si, nil
+}
+
+func execWorker(app *config.Application, sourceInput source.Input, format sbom.Format, predicateType string, sv *sign.SignerVerifier) <-chan error {
+	errs := make(chan error)
+	go func() {
+		defer close(errs)
+
+		src, cleanup, err := source.NewFromRegistry(sourceInput, app.Registry.ToOptions(), app.Exclusions)
+		if cleanup != nil {
+			defer cleanup()
+		}
+		if err != nil {
+			errs <- fmt.Errorf("failed to construct source from user input %q: %w", sourceInput.UserInput, err)
+			return
+		}
+
+		s, err := packages.GenerateSBOM(src, errs, app)
+		if err != nil {
+			errs <- err
+			return
+		}
+
+		sbomBytes, err := syft.Encode(*s, format)
+		if err != nil {
+			errs <- err
+			return
+		}
+
+		err = generateAttestation(sbomBytes, src, sv, predicateType)
+		if err != nil {
+			errs <- err
+			return
+		}
+	}()
+	return errs
+}
+
+func generateAttestation(predicate []byte, src *source.Source, sv *sign.SignerVerifier, predicateType string) error {
+	switch len(src.Image.Metadata.RepoDigests) {
+	case 0:
+		return fmt.Errorf("cannot generate attestation since no repo digests were found; make sure you're passing an OCI registry source for the attest command")
+	case 1:
+	default:
+		return fmt.Errorf("cannot generate attestation since multiple repo digests were found for the image: %+v", src.Image.Metadata.RepoDigests)
+	}
+
+	wrapped := dsse.WrapSigner(sv, intotoJSONDsseType)
+
+	sh, err := attestation.GenerateStatement(attestation.GenerateOpts{
+		Predicate: bytes.NewBuffer(predicate),
+		Type:      predicateType,
+		Digest:    findValidDigest(src.Image.Metadata.RepoDigests),
+	})
+	if err != nil {
+		return err
+	}
+
+	payload, err := json.Marshal(sh)
+	if err != nil {
+		return err
+	}
+
+	signedPayload, err := wrapped.SignMessage(bytes.NewReader(payload), signatureoptions.WithContext(context.Background()))
+	if err != nil {
+		return errors.Wrap(err, "unable to sign SBOM")
+	}
+
+	bus.Publish(partybus.Event{
+		Type: event.Exit,
+		Value: func() error {
+			_, err := os.Stdout.Write(signedPayload)
+			return err
+		},
+	})
+
+	return nil
+}
+
+func findValidDigest(digests []string) string {
+	// since we are only using the OCI repo provider for this source we are safe that this is only 1 value
+	// see https://github.com/anchore/stereoscope/blob/25ebd49a842b5ac0a20c2e2b4b81335b64ad248c/pkg/image/oci/registry_provider.go#L57-L63
+	split := strings.Split(digests[0], "sha256:")
+	return split[1]
+}
+
+func formatPredicateType(format sbom.Format) string {
+	switch format.ID() {
+	case spdx22json.ID:
+		return in_toto.PredicateSPDX
+	case cyclonedxjson.ID:
+		// Tentative see https://github.com/in-toto/attestation/issues/82
+		return "https://cyclonedx.org/bom"
+	case syftjson.ID:
+		return "https://syft.dev/bom"
+	default:
+		return ""
+	}
+}

cmd/syft/cli/attest/password.go

@@ -0,0 +1,56 @@
+package attest
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"strings"
+
+	"github.com/anchore/syft/internal"
+	"github.com/anchore/syft/internal/log"
+	"github.com/sigstore/cosign/pkg/cosign"
+)
+
+func selectPassFunc(keypath, password string) (cosign.PassFunc, error) {
+	keyContents, err := os.ReadFile(keypath)
+	if err != nil {
+		return nil, err
+	}
+
+	var fn cosign.PassFunc = func(bool) (b []byte, err error) { return nil, nil }
+
+	_, err = cosign.LoadPrivateKey(keyContents, nil)
+	if err != nil {
+		fn = func(bool) (b []byte, err error) {
+			return fetchPassword(password)
+		}
+	}
+
+	return fn, nil
+}
+
+func fetchPassword(password string) (b []byte, err error) {
+	potentiallyPipedInput, err := internal.IsPipedInput()
+	if err != nil {
+		log.Warnf("unable to determine if there is piped input: %+v", err)
+	}
+
+	switch {
+	case password != "":
+		return []byte(password), nil
+	case potentiallyPipedInput:
+		// handle piped in passwords
+		pwBytes, err := io.ReadAll(os.Stdin)
+		if err != nil {
+			return nil, fmt.Errorf("unable to get password from stdin: %w", err)
+		}
+		// be resilient to input that may have newline characters (in case someone is using echo without -n)
+		cleanPw := strings.TrimRight(string(pwBytes), "\n")
+		return []byte(cleanPw), nil
+	case internal.IsTerminal():
+		return cosign.GetPassFromTerm(false)
+	}
+
+	return nil, errors.New("no method available to fetch password")
+}

cmd/syft/cli/commands.go

@@ -0,0 +1,143 @@
+package cli
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/anchore/stereoscope"
+	"github.com/anchore/syft/internal/logger"
+	"github.com/anchore/syft/syft"
+
+	"github.com/anchore/syft/cmd/syft/cli/options"
+	"github.com/anchore/syft/internal"
+	"github.com/anchore/syft/internal/bus"
+	"github.com/anchore/syft/internal/config"
+	"github.com/anchore/syft/internal/log"
+	"github.com/anchore/syft/internal/version"
+	"github.com/anchore/syft/syft/event"
+	"github.com/gookit/color"
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+	"github.com/wagoodman/go-partybus"
+)
+
+const indent = "  "
+
+// New constructs the `syft packages` command, aliases the root command to `syft packages`,
+// and constructs the `syft power-user` and `syft attest` commands. It is also responsible for
+// organizing flag usage and injecting the application config for each command.
+// Because of how the `cobra` library behaves, the application's configuration is initialized
+// at this level. Values from the config should only be used after `app.LoadAllValues` has been called.
+// Cobra does not have knowledge of the user provided flags until the `RunE` block of each command.
+// `RunE` is the earliest that the complete application configuration can be loaded.
+func New() (*cobra.Command, error) {
+	app := &config.Application{}
+
+	// allow for nested options to be specified via environment variables
+	// e.g. pod.context = APPNAME_POD_CONTEXT
+	v := viper.NewWithOptions(viper.EnvKeyReplacer(strings.NewReplacer(".", "_", "-", "_")))
+
+	// since root is aliased as the packages cmd we need to construct this command first
+	// we also need the command to have information about the `root` options because of this alias
+	ro := &options.RootOptions{}
+	po := &options.PackagesOptions{}
+	packagesCmd := Packages(v, app, ro, po)
+
+	// root options are also passed to the attestCmd so that a user provided config location can be discovered
+	attestCmd := Attest(v, app, ro)
+	poweruserCmd := PowerUser(v, app, ro)
+
+	// rootCmd is currently an alias for the packages command
+	rootCmd := &cobra.Command{
+		Short:         packagesCmd.Short,
+		Long:          packagesCmd.Long,
+		Args:          packagesCmd.Args,
+		Example:       packagesCmd.Example,
+		SilenceUsage:  true,
+		SilenceErrors: true,
+		RunE:          packagesCmd.RunE,
+		Version:       version.FromBuild().Version,
+	}
+	rootCmd.SetVersionTemplate(fmt.Sprintf("%s {{.Version}}\n", internal.ApplicationName))
+
+	// start adding flags to all the commands
+	err := ro.AddFlags(rootCmd, v)
+	if err != nil {
+		return nil, err
+	}
+	// package flags need to be decorated onto the rootCmd so that rootCmd can function as a packages alias
+	err = po.AddFlags(rootCmd, v)
+	if err != nil {
+		return nil, err
+	}
+	// attest also uses flags from the packagesCmd since it generates an sbom
+	err = po.AddFlags(attestCmd, v)
+	if err != nil {
+		return nil, err
+	}
+	// poweruser also uses the packagesCmd flags since it is a specialized version of the command
+	err = po.AddFlags(poweruserCmd, v)
+	if err != nil {
+		return nil, err
+	}
+
+	// Add sub-commands.
+	rootCmd.AddCommand(packagesCmd)
+	rootCmd.AddCommand(attestCmd)
+	rootCmd.AddCommand(poweruserCmd)
+	rootCmd.AddCommand(Completion())
+	rootCmd.AddCommand(Version(v, app))
+
+	return rootCmd, err
+}
+
+func validateArgs(cmd *cobra.Command, args []string) error {
+	if len(args) == 0 {
+		// in the case that no arguments are given we want to show the help text and return with a non-0 return code.
+		if err := cmd.Help(); err != nil {
+			return fmt.Errorf("unable to display help: %w", err)
+		}
+		return fmt.Errorf("an image/directory argument is required")
+	}
+
+	return cobra.MaximumNArgs(1)(cmd, args)
+}
+
+func checkForApplicationUpdate() {
+	log.Debugf("checking if new vesion of %s is available", internal.ApplicationName)
+	isAvailable, newVersion, err := version.IsUpdateAvailable()
+	if err != nil {
+		// this should never stop the application
+		log.Errorf(err.Error())
+	}
+	if isAvailable {
+		log.Infof("new version of %s is available: %s (current version is %s)", internal.ApplicationName, newVersion, version.FromBuild().Version)
+
+		bus.Publish(partybus.Event{
+			Type:  event.AppUpdateAvailable,
+			Value: newVersion,
+		})
+	} else {
+		log.Debugf("no new %s update available", internal.ApplicationName)
+	}
+}
+
+func logApplicationConfig(app *config.Application) {
+	log.Debugf("application config:\n%+v", color.Magenta.Sprint(app.String()))
+}
+
+func newLogWrapper(app *config.Application) {
+	cfg := logger.LogrusConfig{
+		EnableConsole: (app.Log.FileLocation == "" || app.Verbosity > 0) && !app.Quiet,
+		EnableFile:    app.Log.FileLocation != "",
+		Level:         app.Log.LevelOpt,
+		Structured:    app.Log.Structured,
+		FileLocation:  app.Log.FileLocation,
+	}
+
+	logWrapper := logger.NewLogrusLogger(cfg)
+	syft.SetLogger(logWrapper)
+	stereoscope.SetLogger(&logger.LogrusNestedLogger{
+		Logger: logWrapper.Logger.WithField("from-lib", "stereoscope"),
+	})
+}

cmd/syft/cli/completion.go

@@ -0,0 +1,54 @@
+package cli
+
+import (
+	"os"
+
+	"github.com/spf13/cobra"
+)
+
+func Completion() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "completion [bash|zsh|fish]",
+		Short: "Generate a shell completion for Syft (listing local docker images)",
+		Long: `To load completions (docker image list):
+	Bash:
+	$ source <(syft completion bash)
+# To load completions for each session, execute once:
+	Linux:
+	  $ syft completion bash > /etc/bash_completion.d/syft
+	MacOS:
+	  $ syft completion bash > /usr/local/etc/bash_completion.d/syft
+	Zsh:
+# If shell completion is not already enabled in your environment you will need
+# to enable it.  You can execute the following once:
+	$ echo "autoload -U compinit; compinit" >> ~/.zshrc
+# To load completions for each session, execute once:
+	$ syft completion zsh > "${fpath[1]}/_syft"
+# You will need to start a new shell for this setup to take effect.
+	Fish:
+	$ syft completion fish | source
+# To load completions for each session, execute once:
+	$ syft completion fish > ~/.config/fish/completions/syft.fish
+	`,
+		DisableFlagsInUseLine: true,
+		ValidArgs:             []string{"bash", "zsh", "fish"},
+		Args:                  cobra.ExactValidArgs(1),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			var err error
+			switch args[0] {
+			case "bash":
+				err = cmd.Root().GenBashCompletion(os.Stdout)
+			case "zsh":
+				err = cmd.Root().GenZshCompletion(os.Stdout)
+			case "fish":
+				err = cmd.Root().GenFishCompletion(os.Stdout, true)
+			}
+			if err != nil {
+				return err
+			}
+			return nil
+		},
+	}
+
+	return cmd
+}

cmd/syft/cli/eventloop/event_loop.go

@@ -0,0 +1,98 @@
+package eventloop
+
+import (
+	"errors"
+	"fmt"
+	"os"
+
+	"github.com/anchore/syft/internal/log"
+	"github.com/anchore/syft/internal/ui"
+	"github.com/hashicorp/go-multierror"
+	"github.com/wagoodman/go-partybus"
+)
+
+// eventLoop listens to worker errors (from execution path), worker events (from a partybus subscription), and
+// signal interrupts. Is responsible for handling each event relative to a given UI an to coordinate eventing until
+// an eventual graceful exit.
+// nolint:funlen
+func EventLoop(workerErrs <-chan error, signals <-chan os.Signal, subscription *partybus.Subscription, cleanupFn func(), uxs ...ui.UI) error {
+	defer cleanupFn()
+	events := subscription.Events()
+	var err error
+	var ux ui.UI
+
+	if ux, err = setupUI(subscription.Unsubscribe, uxs...); err != nil {
+		return err
+	}
+
+	var retErr error
+	var forceTeardown bool
+
+	for {
+		if workerErrs == nil && events == nil {
+			break
+		}
+		select {
+		case err, isOpen := <-workerErrs:
+			if !isOpen {
+				workerErrs = nil
+				continue
+			}
+			if err != nil {
+				// capture the error from the worker and unsubscribe to complete a graceful shutdown
+				retErr = multierror.Append(retErr, err)
+				_ = subscription.Unsubscribe()
+				// the worker has exited, we may have been mid-handling events for the UI which should now be
+				// ignored, in which case forcing a teardown of the UI irregardless of the state is required.
+				forceTeardown = true
+			}
+		case e, isOpen := <-events:
+			if !isOpen {
+				events = nil
+				continue
+			}
+
+			if err := ux.Handle(e); err != nil {
+				if errors.Is(err, partybus.ErrUnsubscribe) {
+					events = nil
+				} else {
+					retErr = multierror.Append(retErr, err)
+					// TODO: should we unsubscribe? should we try to halt execution? or continue?
+				}
+			}
+		case <-signals:
+			// ignore further results from any event source and exit ASAP, but ensure that all cache is cleaned up.
+			// we ignore further errors since cleaning up the tmp directories will affect running catalogers that are
+			// reading/writing from/to their nested temp dirs. This is acceptable since we are bailing without result.
+
+			// TODO: potential future improvement would be to pass context into workers with a cancel function that is
+			// to the event loop. In this way we can have a more controlled shutdown even at the most nested levels
+			// of processing.
+			events = nil
+			workerErrs = nil
+			forceTeardown = true
+		}
+	}
+
+	if err := ux.Teardown(forceTeardown); err != nil {
+		retErr = multierror.Append(retErr, err)
+	}
+
+	return retErr
+}
+
+// setupUI takes one or more UIs that responds to events and takes a event bus unsubscribe function for use
+// during teardown. With the given UIs, the first UI which the ui.Setup() function does not return an error
+// will be utilized in execution. Providing a set of UIs allows for the caller to provide graceful fallbacks
+// when there are environmental problem (e.g. unable to setup a TUI with the current TTY).
+func setupUI(unsubscribe func() error, uis ...ui.UI) (ui.UI, error) {
+	for _, ux := range uis {
+		if err := ux.Setup(unsubscribe); err != nil {
+			log.Warnf("unable to setup given UI, falling back to alternative UI: %+v", err)
+			continue
+		}
+
+		return ux, nil
+	}
+	return nil, fmt.Errorf("unable to setup any UI")
+}

cmd/syft/cli/eventloop/event_loop_test.go

@@ -0,0 +1,455 @@
+package eventloop
+
+import (
+	"fmt"
+	"os"
+	"syscall"
+	"testing"
+	"time"
+
+	"github.com/anchore/syft/internal/ui"
+	"github.com/anchore/syft/syft/event"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/mock"
+	"github.com/wagoodman/go-partybus"
+)
+
+var _ ui.UI = (*uiMock)(nil)
+
+type uiMock struct {
+	t           *testing.T
+	finalEvent  partybus.Event
+	unsubscribe func() error
+	mock.Mock
+}
+
+func (u *uiMock) Setup(unsubscribe func() error) error {
+	u.t.Logf("UI Setup called")
+	u.unsubscribe = unsubscribe
+	return u.Called(unsubscribe).Error(0)
+}
+
+func (u *uiMock) Handle(event partybus.Event) error {
+	u.t.Logf("UI Handle called: %+v", event.Type)
+	if event == u.finalEvent {
+		assert.NoError(u.t, u.unsubscribe())
+	}
+	return u.Called(event).Error(0)
+}
+
+func (u *uiMock) Teardown(_ bool) error {
+	u.t.Logf("UI Teardown called")
+	return u.Called().Error(0)
+}
+
+func Test_EventLoop_gracefulExit(t *testing.T) {
+	test := func(t *testing.T) {
+
+		testBus := partybus.NewBus()
+		subscription := testBus.Subscribe()
+		t.Cleanup(testBus.Close)
+
+		finalEvent := partybus.Event{
+			Type: event.Exit,
+		}
+
+		worker := func() <-chan error {
+			ret := make(chan error)
+			go func() {
+				t.Log("worker running")
+				// send an empty item (which is ignored) ensuring we've entered the select statement,
+				// then close (a partial shutdown).
+				ret <- nil
+				t.Log("worker sent nothing")
+				close(ret)
+				t.Log("worker closed")
+				// do the other half of the shutdown
+				testBus.Publish(finalEvent)
+				t.Log("worker published final event")
+			}()
+			return ret
+		}
+
+		signaler := func() <-chan os.Signal {
+			return nil
+		}
+
+		ux := &uiMock{
+			t:          t,
+			finalEvent: finalEvent,
+		}
+
+		// ensure the mock sees at least the final event
+		ux.On("Handle", finalEvent).Return(nil)
+		// ensure the mock sees basic setup/teardown events
+		ux.On("Setup", mock.AnythingOfType("func() error")).Return(nil)
+		ux.On("Teardown").Return(nil)
+
+		var cleanupCalled bool
+		cleanupFn := func() {
+			t.Log("cleanup called")
+			cleanupCalled = true
+		}
+
+		assert.NoError(t,
+			EventLoop(
+				worker(),
+				signaler(),
+				subscription,
+				cleanupFn,
+				ux,
+			),
+		)
+
+		assert.True(t, cleanupCalled, "cleanup function not called")
+		ux.AssertExpectations(t)
+	}
+
+	// if there is a bug, then there is a risk of the event loop never returning
+	testWithTimeout(t, 5*time.Second, test)
+}
+
+func Test_EventLoop_workerError(t *testing.T) {
+	test := func(t *testing.T) {
+
+		testBus := partybus.NewBus()
+		subscription := testBus.Subscribe()
+		t.Cleanup(testBus.Close)
+
+		workerErr := fmt.Errorf("worker error")
+
+		worker := func() <-chan error {
+			ret := make(chan error)
+			go func() {
+				t.Log("worker running")
+				// send an empty item (which is ignored) ensuring we've entered the select statement,
+				// then close (a partial shutdown).
+				ret <- nil
+				t.Log("worker sent nothing")
+				ret <- workerErr
+				t.Log("worker sent error")
+				close(ret)
+				t.Log("worker closed")
+				// note: NO final event is fired
+			}()
+			return ret
+		}
+
+		signaler := func() <-chan os.Signal {
+			return nil
+		}
+
+		ux := &uiMock{
+			t: t,
+		}
+
+		// ensure the mock sees basic setup/teardown events
+		ux.On("Setup", mock.AnythingOfType("func() error")).Return(nil)
+		ux.On("Teardown").Return(nil)
+
+		var cleanupCalled bool
+		cleanupFn := func() {
+			t.Log("cleanup called")
+			cleanupCalled = true
+		}
+
+		// ensure we see an error returned
+		assert.ErrorIs(t,
+			EventLoop(
+				worker(),
+				signaler(),
+				subscription,
+				cleanupFn,
+				ux,
+			),
+			workerErr,
+			"should have seen a worker error, but did not",
+		)
+
+		assert.True(t, cleanupCalled, "cleanup function not called")
+		ux.AssertExpectations(t)
+	}
+
+	// if there is a bug, then there is a risk of the event loop never returning
+	testWithTimeout(t, 5*time.Second, test)
+}
+
+func Test_EventLoop_unsubscribeError(t *testing.T) {
+	test := func(t *testing.T) {
+
+		testBus := partybus.NewBus()
+		subscription := testBus.Subscribe()
+		t.Cleanup(testBus.Close)
+
+		finalEvent := partybus.Event{
+			Type: event.Exit,
+		}
+
+		worker := func() <-chan error {
+			ret := make(chan error)
+			go func() {
+				t.Log("worker running")
+				// send an empty item (which is ignored) ensuring we've entered the select statement,
+				// then close (a partial shutdown).
+				ret <- nil
+				t.Log("worker sent nothing")
+				close(ret)
+				t.Log("worker closed")
+				// do the other half of the shutdown
+				testBus.Publish(finalEvent)
+				t.Log("worker published final event")
+			}()
+			return ret
+		}
+
+		signaler := func() <-chan os.Signal {
+			return nil
+		}
+
+		ux := &uiMock{
+			t:          t,
+			finalEvent: finalEvent,
+		}
+
+		// ensure the mock sees at least the final event... note the unsubscribe error here
+		ux.On("Handle", finalEvent).Return(partybus.ErrUnsubscribe)
+		// ensure the mock sees basic setup/teardown events
+		ux.On("Setup", mock.AnythingOfType("func() error")).Return(nil)
+		ux.On("Teardown").Return(nil)
+
+		var cleanupCalled bool
+		cleanupFn := func() {
+			t.Log("cleanup called")
+			cleanupCalled = true
+		}
+
+		// unsubscribe errors should be handled and ignored, not propagated. We are additionally asserting that
+		// this case is handled as a controlled shutdown (this test should not timeout)
+		assert.NoError(t,
+			EventLoop(
+				worker(),
+				signaler(),
+				subscription,
+				cleanupFn,
+				ux,
+			),
+		)
+
+		assert.True(t, cleanupCalled, "cleanup function not called")
+		ux.AssertExpectations(t)
+	}
+
+	// if there is a bug, then there is a risk of the event loop never returning
+	testWithTimeout(t, 5*time.Second, test)
+}
+
+func Test_EventLoop_handlerError(t *testing.T) {
+	test := func(t *testing.T) {
+
+		testBus := partybus.NewBus()
+		subscription := testBus.Subscribe()
+		t.Cleanup(testBus.Close)
+
+		finalEvent := partybus.Event{
+			Type:  event.Exit,
+			Error: fmt.Errorf("an exit error occured"),
+		}
+
+		worker := func() <-chan error {
+			ret := make(chan error)
+			go func() {
+				t.Log("worker running")
+				// send an empty item (which is ignored) ensuring we've entered the select statement,
+				// then close (a partial shutdown).
+				ret <- nil
+				t.Log("worker sent nothing")
+				close(ret)
+				t.Log("worker closed")
+				// do the other half of the shutdown
+				testBus.Publish(finalEvent)
+				t.Log("worker published final event")
+			}()
+			return ret
+		}
+
+		signaler := func() <-chan os.Signal {
+			return nil
+		}
+
+		ux := &uiMock{
+			t:          t,
+			finalEvent: finalEvent,
+		}
+
+		// ensure the mock sees at least the final event... note the event error is propagated
+		ux.On("Handle", finalEvent).Return(finalEvent.Error)
+		// ensure the mock sees basic setup/teardown events
+		ux.On("Setup", mock.AnythingOfType("func() error")).Return(nil)
+		ux.On("Teardown").Return(nil)
+
+		var cleanupCalled bool
+		cleanupFn := func() {
+			t.Log("cleanup called")
+			cleanupCalled = true
+		}
+
+		// handle errors SHOULD propagate the event loop. We are additionally asserting that this case is
+		// handled as a controlled shutdown (this test should not timeout)
+		assert.ErrorIs(t,
+			EventLoop(
+				worker(),
+				signaler(),
+				subscription,
+				cleanupFn,
+				ux,
+			),
+			finalEvent.Error,
+			"should have seen a event error, but did not",
+		)
+
+		assert.True(t, cleanupCalled, "cleanup function not called")
+		ux.AssertExpectations(t)
+	}
+
+	// if there is a bug, then there is a risk of the event loop never returning
+	testWithTimeout(t, 5*time.Second, test)
+}
+
+func Test_EventLoop_signalsStopExecution(t *testing.T) {
+	test := func(t *testing.T) {
+
+		testBus := partybus.NewBus()
+		subscription := testBus.Subscribe()
+		t.Cleanup(testBus.Close)
+
+		worker := func() <-chan error {
+			// the worker will never return work and the event loop will always be waiting...
+			return make(chan error)
+		}
+
+		signaler := func() <-chan os.Signal {
+			ret := make(chan os.Signal)
+			go func() {
+				ret <- syscall.SIGINT
+				// note: we do NOT close the channel to ensure the event loop does not depend on that behavior to exit
+			}()
+			return ret
+		}
+
+		ux := &uiMock{
+			t: t,
+		}
+
+		// ensure the mock sees basic setup/teardown events
+		ux.On("Setup", mock.AnythingOfType("func() error")).Return(nil)
+		ux.On("Teardown").Return(nil)
+
+		var cleanupCalled bool
+		cleanupFn := func() {
+			t.Log("cleanup called")
+			cleanupCalled = true
+		}
+
+		assert.NoError(t,
+			EventLoop(
+				worker(),
+				signaler(),
+				subscription,
+				cleanupFn,
+				ux,
+			),
+		)
+
+		assert.True(t, cleanupCalled, "cleanup function not called")
+		ux.AssertExpectations(t)
+	}
+
+	// if there is a bug, then there is a risk of the event loop never returning
+	testWithTimeout(t, 5*time.Second, test)
+}
+
+func Test_EventLoop_uiTeardownError(t *testing.T) {
+	test := func(t *testing.T) {
+
+		testBus := partybus.NewBus()
+		subscription := testBus.Subscribe()
+		t.Cleanup(testBus.Close)
+
+		finalEvent := partybus.Event{
+			Type: event.Exit,
+		}
+
+		worker := func() <-chan error {
+			ret := make(chan error)
+			go func() {
+				t.Log("worker running")
+				// send an empty item (which is ignored) ensuring we've entered the select statement,
+				// then close (a partial shutdown).
+				ret <- nil
+				t.Log("worker sent nothing")
+				close(ret)
+				t.Log("worker closed")
+				// do the other half of the shutdown
+				testBus.Publish(finalEvent)
+				t.Log("worker published final event")
+			}()
+			return ret
+		}
+
+		signaler := func() <-chan os.Signal {
+			return nil
+		}
+
+		ux := &uiMock{
+			t:          t,
+			finalEvent: finalEvent,
+		}
+
+		teardownError := fmt.Errorf("sorry, dave, the UI doesn't want to be torn down")
+
+		// ensure the mock sees at least the final event... note the event error is propagated
+		ux.On("Handle", finalEvent).Return(nil)
+		// ensure the mock sees basic setup/teardown events
+		ux.On("Setup", mock.AnythingOfType("func() error")).Return(nil)
+		ux.On("Teardown").Return(teardownError)
+
+		var cleanupCalled bool
+		cleanupFn := func() {
+			t.Log("cleanup called")
+			cleanupCalled = true
+		}
+
+		// ensure we see an error returned
+		assert.ErrorIs(t,
+			EventLoop(
+				worker(),
+				signaler(),
+				subscription,
+				cleanupFn,
+				ux,
+			),
+			teardownError,
+			"should have seen a UI teardown error, but did not",
+		)
+
+		assert.True(t, cleanupCalled, "cleanup function not called")
+		ux.AssertExpectations(t)
+	}
+
+	// if there is a bug, then there is a risk of the event loop never returning
+	testWithTimeout(t, 5*time.Second, test)
+}
+
+func testWithTimeout(t *testing.T, timeout time.Duration, test func(*testing.T)) {
+	done := make(chan bool)
+	go func() {
+		test(t)
+		done <- true
+	}()
+
+	select {
+	case <-time.After(timeout):
+		t.Fatal("test timed out")
+	case <-done:
+	}
+}

cmd/syft/cli/eventloop/signals.go

@@ -0,0 +1,20 @@
+package eventloop
+
+import (
+	"os"
+	"os/signal"
+	"syscall"
+)
+
+func SetupSignals() <-chan os.Signal {
+	c := make(chan os.Signal, 1) // Note: A buffered channel is recommended for this; see https://golang.org/pkg/os/signal/#Notify
+
+	interruptions := []os.Signal{
+		syscall.SIGINT,
+		syscall.SIGTERM,
+	}
+
+	signal.Notify(c, interruptions...)
+
+	return c
+}

cmd/syft/cli/eventloop/tasks.go

@@ -0,0 +1,232 @@
+package eventloop
+
+import (
+	"crypto"
+	"fmt"
+
+	"github.com/anchore/syft/internal/config"
+	"github.com/anchore/syft/syft"
+	"github.com/anchore/syft/syft/artifact"
+	"github.com/anchore/syft/syft/file"
+	"github.com/anchore/syft/syft/sbom"
+	"github.com/anchore/syft/syft/source"
+)
+
+type Task func(*sbom.Artifacts, *source.Source) ([]artifact.Relationship, error)
+
+func Tasks(app *config.Application) ([]Task, error) {
+	var tasks []Task
+
+	generators := []func(app *config.Application) (Task, error){
+		generateCatalogPackagesTask,
+		generateCatalogFileMetadataTask,
+		generateCatalogFileDigestsTask,
+		generateCatalogSecretsTask,
+		generateCatalogFileClassificationsTask,
+		generateCatalogContentsTask,
+	}
+
+	for _, generator := range generators {
+		task, err := generator(app)
+		if err != nil {
+			return nil, err
+		}
+
+		if task != nil {
+			tasks = append(tasks, task)
+		}
+	}
+
+	return tasks, nil
+}
+
+func generateCatalogPackagesTask(app *config.Application) (Task, error) {
+	if !app.Package.Cataloger.Enabled {
+		return nil, nil
+	}
+
+	task := func(results *sbom.Artifacts, src *source.Source) ([]artifact.Relationship, error) {
+		packageCatalog, relationships, theDistro, err := syft.CatalogPackages(src, app.Package.ToConfig())
+		if err != nil {
+			return nil, err
+		}
+
+		results.PackageCatalog = packageCatalog
+		results.LinuxDistribution = theDistro
+
+		return relationships, nil
+	}
+
+	return task, nil
+}
+
+func generateCatalogFileMetadataTask(app *config.Application) (Task, error) {
+	if !app.FileMetadata.Cataloger.Enabled {
+		return nil, nil
+	}
+
+	metadataCataloger := file.NewMetadataCataloger()
+
+	task := func(results *sbom.Artifacts, src *source.Source) ([]artifact.Relationship, error) {
+		resolver, err := src.FileResolver(app.FileMetadata.Cataloger.ScopeOpt)
+		if err != nil {
+			return nil, err
+		}
+
+		result, err := metadataCataloger.Catalog(resolver)
+		if err != nil {
+			return nil, err
+		}
+		results.FileMetadata = result
+		return nil, nil
+	}
+
+	return task, nil
+}
+
+func generateCatalogFileDigestsTask(app *config.Application) (Task, error) {
+	if !app.FileMetadata.Cataloger.Enabled {
+		return nil, nil
+	}
+
+	supportedHashAlgorithms := make(map[string]crypto.Hash)
+	for _, h := range []crypto.Hash{
+		crypto.MD5,
+		crypto.SHA1,
+		crypto.SHA256,
+	} {
+		supportedHashAlgorithms[file.DigestAlgorithmName(h)] = h
+	}
+
+	var hashes []crypto.Hash
+	for _, hashStr := range app.FileMetadata.Digests {
+		name := file.CleanDigestAlgorithmName(hashStr)
+		hashObj, ok := supportedHashAlgorithms[name]
+		if !ok {
+			return nil, fmt.Errorf("unsupported hash algorithm: %s", hashStr)
+		}
+		hashes = append(hashes, hashObj)
+	}
+
+	digestsCataloger, err := file.NewDigestsCataloger(hashes)
+	if err != nil {
+		return nil, err
+	}
+
+	task := func(results *sbom.Artifacts, src *source.Source) ([]artifact.Relationship, error) {
+		resolver, err := src.FileResolver(app.FileMetadata.Cataloger.ScopeOpt)
+		if err != nil {
+			return nil, err
+		}
+
+		result, err := digestsCataloger.Catalog(resolver)
+		if err != nil {
+			return nil, err
+		}
+		results.FileDigests = result
+		return nil, nil
+	}
+
+	return task, nil
+}
+
+func generateCatalogSecretsTask(app *config.Application) (Task, error) {
+	if !app.Secrets.Cataloger.Enabled {
+		return nil, nil
+	}
+
+	patterns, err := file.GenerateSearchPatterns(file.DefaultSecretsPatterns, app.Secrets.AdditionalPatterns, app.Secrets.ExcludePatternNames)
+	if err != nil {
+		return nil, err
+	}
+
+	secretsCataloger, err := file.NewSecretsCataloger(patterns, app.Secrets.RevealValues, app.Secrets.SkipFilesAboveSize)
+	if err != nil {
+		return nil, err
+	}
+
+	task := func(results *sbom.Artifacts, src *source.Source) ([]artifact.Relationship, error) {
+		resolver, err := src.FileResolver(app.Secrets.Cataloger.ScopeOpt)
+		if err != nil {
+			return nil, err
+		}
+
+		result, err := secretsCataloger.Catalog(resolver)
+		if err != nil {
+			return nil, err
+		}
+		results.Secrets = result
+		return nil, nil
+	}
+
+	return task, nil
+}
+
+func generateCatalogFileClassificationsTask(app *config.Application) (Task, error) {
+	if !app.FileClassification.Cataloger.Enabled {
+		return nil, nil
+	}
+
+	// TODO: in the future we could expose out the classifiers via configuration
+	classifierCataloger, err := file.NewClassificationCataloger(file.DefaultClassifiers)
+	if err != nil {
+		return nil, err
+	}
+
+	task := func(results *sbom.Artifacts, src *source.Source) ([]artifact.Relationship, error) {
+		resolver, err := src.FileResolver(app.FileClassification.Cataloger.ScopeOpt)
+		if err != nil {
+			return nil, err
+		}
+
+		result, err := classifierCataloger.Catalog(resolver)
+		if err != nil {
+			return nil, err
+		}
+		results.FileClassifications = result
+		return nil, nil
+	}
+
+	return task, nil
+}
+
+func generateCatalogContentsTask(app *config.Application) (Task, error) {
+	if !app.FileContents.Cataloger.Enabled {
+		return nil, nil
+	}
+
+	contentsCataloger, err := file.NewContentsCataloger(app.FileContents.Globs, app.FileContents.SkipFilesAboveSize)
+	if err != nil {
+		return nil, err
+	}
+
+	task := func(results *sbom.Artifacts, src *source.Source) ([]artifact.Relationship, error) {
+		resolver, err := src.FileResolver(app.FileContents.Cataloger.ScopeOpt)
+		if err != nil {
+			return nil, err
+		}
+
+		result, err := contentsCataloger.Catalog(resolver)
+		if err != nil {
+			return nil, err
+		}
+		results.FileContents = result
+		return nil, nil
+	}
+
+	return task, nil
+}
+
+func RunTask(t Task, a *sbom.Artifacts, src *source.Source, c chan<- artifact.Relationship, errs chan<- error) {
+	defer close(c)
+
+	relationships, err := t(a, src)
+	if err != nil {
+		errs <- err
+		return
+	}
+
+	for _, relationship := range relationships {
+		c <- relationship
+	}
+}

cmd/syft/cli/options/attest.go

@@ -0,0 +1,28 @@
+package options
+
+import (
+	"github.com/spf13/cobra"
+	"github.com/spf13/pflag"
+	"github.com/spf13/viper"
+)
+
+type AttestOptions struct {
+	Key string
+}
+
+var _ Interface = (*AttestOptions)(nil)
+
+func (o *AttestOptions) AddFlags(cmd *cobra.Command, v *viper.Viper) error {
+	cmd.PersistentFlags().StringVarP(&o.Key, "key", "", "cosign.key",
+		"path to the private key file to use for attestation")
+
+	return bindAttestationConfigOptions(cmd.PersistentFlags(), v)
+}
+
+func bindAttestationConfigOptions(flags *pflag.FlagSet, v *viper.Viper) error {
+	if err := v.BindPFlag("attest.key", flags.Lookup("key")); err != nil {
+		return err
+	}
+
+	return nil
+}

cmd/syft/cli/options/format.go

@@ -0,0 +1,32 @@
+package options
+
+import (
+	"github.com/anchore/syft/syft"
+	"github.com/anchore/syft/syft/sbom"
+)
+
+func FormatAliases(ids ...sbom.FormatID) (aliases []string) {
+	for _, id := range ids {
+		switch id {
+		case syft.JSONFormatID:
+			aliases = append(aliases, "syft-json")
+		case syft.TextFormatID:
+			aliases = append(aliases, "text")
+		case syft.TableFormatID:
+			aliases = append(aliases, "table")
+		case syft.SPDXJSONFormatID:
+			aliases = append(aliases, "spdx-json")
+		case syft.SPDXTagValueFormatID:
+			aliases = append(aliases, "spdx-tag-value")
+		case syft.CycloneDxXMLFormatID:
+			aliases = append(aliases, "cyclonedx-xml")
+		case syft.CycloneDxJSONFormatID:
+			aliases = append(aliases, "cyclonedx-json")
+		case syft.GitHubID:
+			aliases = append(aliases, "github", "github-json")
+		default:
+			aliases = append(aliases, string(id))
+		}
+	}
+	return aliases
+}

cmd/syft/cli/options/options.go

@@ -0,0 +1,11 @@
+package options
+
+import (
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+)
+
+type Interface interface {
+	// AddFlags adds this options' flags to the cobra command.
+	AddFlags(cmd *cobra.Command, v *viper.Viper) error
+}

cmd/syft/cli/options/packages.go

@@ -0,0 +1,118 @@
+package options
+
+import (
+	"fmt"
+
+	"github.com/anchore/syft/internal/formats/table"
+	"github.com/anchore/syft/syft"
+	"github.com/anchore/syft/syft/pkg/cataloger"
+	"github.com/anchore/syft/syft/source"
+	"github.com/spf13/cobra"
+	"github.com/spf13/pflag"
+	"github.com/spf13/viper"
+)
+
+type PackagesOptions struct {
+	Scope                  string
+	Output                 []string
+	File                   string
+	Platform               string
+	Host                   string
+	Username               string
+	Password               string
+	Dockerfile             string
+	Exclude                []string
+	OverwriteExistingImage bool
+	ImportTimeout          uint
+}
+
+var _ Interface = (*PackagesOptions)(nil)
+
+func (o *PackagesOptions) AddFlags(cmd *cobra.Command, v *viper.Viper) error {
+	cmd.PersistentFlags().StringVarP(&o.Scope, "scope", "s", cataloger.DefaultSearchConfig().Scope.String(),
+		fmt.Sprintf("selection of layers to catalog, options=%v", source.AllScopes))
+
+	cmd.PersistentFlags().StringArrayVarP(&o.Output, "output", "o", FormatAliases(table.ID),
+		fmt.Sprintf("report output format, options=%v", FormatAliases(syft.FormatIDs()...)))
+
+	cmd.PersistentFlags().StringVarP(&o.File, "file", "", "",
+		"file to write the default report output to (default is STDOUT)")
+
+	cmd.PersistentFlags().StringVarP(&o.Platform, "platform", "", "",
+		"an optional platform specifier for container image sources (e.g. 'linux/arm64', 'linux/arm64/v8', 'arm64', 'linux')")
+
+	cmd.PersistentFlags().StringVarP(&o.Host, "host", "H", "",
+		"the hostname or URL of the Anchore Enterprise instance to upload to")
+
+	cmd.PersistentFlags().StringVarP(&o.Username, "username", "u", "",
+		"the username to authenticate against Anchore Enterprise")
+
+	cmd.PersistentFlags().StringVarP(&o.Password, "password", "p", "",
+		"the password to authenticate against Anchore Enterprise")
+
+	cmd.PersistentFlags().StringVarP(&o.Dockerfile, "dockerfile", "d", "",
+		"include dockerfile for upload to Anchore Enterprise")
+
+	cmd.PersistentFlags().StringArrayVarP(&o.Exclude, "exclude", "", nil,
+		"exclude paths from being scanned using a glob expression")
+
+	cmd.PersistentFlags().BoolVarP(&o.OverwriteExistingImage, "overwrite-existing-image", "", false,
+		"overwrite an existing image during the upload to Anchore Enterprise")
+
+	cmd.PersistentFlags().UintVarP(&o.ImportTimeout, "import-timeout", "", 30,
+		"set a timeout duration (in seconds) for the upload to Anchore Enterprise")
+
+	return bindPackageConfigOptions(cmd.PersistentFlags(), v)
+}
+
+func bindPackageConfigOptions(flags *pflag.FlagSet, v *viper.Viper) error {
+	// Formatting & Input options //////////////////////////////////////////////
+
+	if err := v.BindPFlag("package.cataloger.scope", flags.Lookup("scope")); err != nil {
+		return err
+	}
+
+	if err := v.BindPFlag("file", flags.Lookup("file")); err != nil {
+		return err
+	}
+
+	if err := v.BindPFlag("exclude", flags.Lookup("exclude")); err != nil {
+		return err
+	}
+
+	if err := v.BindPFlag("output", flags.Lookup("output")); err != nil {
+		return err
+	}
+
+	if err := v.BindPFlag("platform", flags.Lookup("platform")); err != nil {
+		return err
+	}
+
+	// Upload options //////////////////////////////////////////////////////////
+
+	if err := v.BindPFlag("anchore.host", flags.Lookup("host")); err != nil {
+		return err
+	}
+
+	if err := v.BindPFlag("anchore.username", flags.Lookup("username")); err != nil {
+		return err
+	}
+
+	if err := v.BindPFlag("anchore.password", flags.Lookup("password")); err != nil {
+		return err
+	}
+
+	if err := v.BindPFlag("anchore.dockerfile", flags.Lookup("dockerfile")); err != nil {
+		return err
+	}
+
+	if err := v.BindPFlag("anchore.overwrite-existing-image", flags.Lookup("overwrite-existing-image")); err != nil {
+		return err
+	}
+
+	if err := v.BindPFlag("anchore.import-timeout", flags.Lookup("import-timeout")); err != nil {
+		return err
+	}
+
+	return nil
+}

cmd/syft/cli/options/root.go

@@ -0,0 +1,36 @@
+package options
+
+import (
+	"github.com/spf13/cobra"
+	"github.com/spf13/pflag"
+	"github.com/spf13/viper"
+)
+
+type RootOptions struct {
+	Config  string
+	Quiet   bool
+	Verbose int
+}
+
+var _ Interface = (*RootOptions)(nil)
+
+func (o *RootOptions) AddFlags(cmd *cobra.Command, v *viper.Viper) error {
+	cmd.PersistentFlags().StringVarP(&o.Config, "config", "c", "", "application config file")
+	cmd.PersistentFlags().CountVarP(&o.Verbose, "verbose", "v", "increase verbosity (-v = info, -vv = debug)")
+	cmd.PersistentFlags().BoolVarP(&o.Quiet, "quiet", "q", false, "suppress all logging output")
+
+	return bindRootConfigOptions(cmd.PersistentFlags(), v)
+}
+
+func bindRootConfigOptions(flags *pflag.FlagSet, v *viper.Viper) error {
+	if err := v.BindPFlag("config", flags.Lookup("config")); err != nil {
+		return err
+	}
+	if err := v.BindPFlag("verbosity", flags.Lookup("verbose")); err != nil {
+		return err
+	}
+	if err := v.BindPFlag("quiet", flags.Lookup("quiet")); err != nil {
+		return err
+	}
+	return nil
+}

cmd/syft/cli/options/verbose.go

@@ -0,0 +1,18 @@
+package options
+
+import (
+	"github.com/anchore/syft/internal"
+	"github.com/anchore/syft/internal/config"
+	"github.com/anchore/syft/internal/log"
+)
+
+func IsVerbose(app *config.Application) (result bool) {
+	isPipedInput, err := internal.IsPipedInput()
+	if err != nil {
+		// since we can't tell if there was piped input we assume that there could be to disable the ETUI
+		log.Warnf("unable to determine if there is piped input: %+v", err)
+		return true
+	}
+	// verbosity should consider if there is piped input (in which case we should not show the ETUI)
+	return app.Verbosity > 0 || isPipedInput
+}

cmd/syft/cli/options/version.go

@@ -0,0 +1,17 @@
+package options
+
+import (
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+)
+
+type VersionOptions struct {
+	Output string
+}
+
+var _ Interface = (*PackagesOptions)(nil)
+
+func (o *VersionOptions) AddFlags(cmd *cobra.Command, v *viper.Viper) error {
+	cmd.Flags().StringVarP(&o.Output, "output", "o", "text", "format to show version information (available=[text, json])")
+	return nil
+}

cmd/syft/cli/packages.go

@@ -0,0 +1,79 @@
+package cli
+
+import (
+	"fmt"
+	"log"
+
+	"github.com/anchore/syft/cmd/syft/cli/options"
+	"github.com/anchore/syft/cmd/syft/cli/packages"
+	"github.com/anchore/syft/internal"
+	"github.com/anchore/syft/internal/config"
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+)
+
+const (
+	packagesExample = `  {{.appName}} {{.command}} alpine:latest                    a summary of discovered packages
+  {{.appName}} {{.command}} alpine:latest -o json            show all possible cataloging details
+  {{.appName}} {{.command}} alpine:latest -o cyclonedx       show a CycloneDX formatted SBOM
+  {{.appName}} {{.command}} alpine:latest -o cyclonedx-json  show a CycloneDX JSON formatted SBOM
+  {{.appName}} {{.command}} alpine:latest -o spdx            show a SPDX 2.2 Tag-Value formatted SBOM
+  {{.appName}} {{.command}} alpine:latest -o spdx-json       show a SPDX 2.2 JSON formatted SBOM
+  {{.appName}} {{.command}} alpine:latest -vv                show verbose debug information
+
+  Supports the following image sources:
+    {{.appName}} {{.command}} yourrepo/yourimage:tag     defaults to using images from a Docker daemon. If Docker is not present, the image is pulled directly from the registry.
+    {{.appName}} {{.command}} path/to/a/file/or/dir      a Docker tar, OCI tar, OCI directory, or generic filesystem directory
+`
+
+	schemeHelpHeader = "You can also explicitly specify the scheme to use:"
+	imageSchemeHelp  = `    {{.appName}} {{.command}} docker:yourrepo/yourimage:tag          explicitly use the Docker daemon
+    {{.appName}} {{.command}} podman:yourrepo/yourimage:tag        	 explicitly use the Podman daemon
+    {{.appName}} {{.command}} registry:yourrepo/yourimage:tag        pull image directly from a registry (no container runtime required)
+    {{.appName}} {{.command}} docker-archive:path/to/yourimage.tar   use a tarball from disk for archives created from "docker save"
+    {{.appName}} {{.command}} oci-archive:path/to/yourimage.tar      use a tarball from disk for OCI archives (from Skopeo or otherwise)
+    {{.appName}} {{.command}} oci-dir:path/to/yourimage              read directly from a path on disk for OCI layout directories (from Skopeo or otherwise)
+`
+	nonImageSchemeHelp = `    {{.appName}} {{.command}} dir:path/to/yourproject                read directly from a path on disk (any directory)
+    {{.appName}} {{.command}} file:path/to/yourproject/file          read directly from a path on disk (any single file)
+`
+	packagesSchemeHelp = "\n" + indent + schemeHelpHeader + "\n" + imageSchemeHelp + nonImageSchemeHelp
+
+	packagesHelp = packagesExample + packagesSchemeHelp
+)
+
+func Packages(v *viper.Viper, app *config.Application, ro *options.RootOptions, po *options.PackagesOptions) *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "packages [SOURCE]",
+		Short: "Generate a package SBOM",
+		Long:  "Generate a packaged-based Software Bill Of Materials (SBOM) from container images and filesystems",
+		Example: internal.Tprintf(packagesHelp, map[string]interface{}{
+			"appName": internal.ApplicationName,
+			"command": "packages",
+		}),
+		Args: func(cmd *cobra.Command, args []string) error {
+			if err := app.LoadAllValues(v, ro.Config); err != nil {
+				return fmt.Errorf("invalid application config: %v", err)
+			}
+			// configure logging for command
+			newLogWrapper(app)
+			logApplicationConfig(app)
+			return validateArgs(cmd, args)
+		},
+		SilenceUsage:  true,
+		SilenceErrors: true,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			if app.CheckForAppUpdate {
+				checkForApplicationUpdate()
+			}
+			return packages.Run(cmd.Context(), app, args)
+		},
+	}
+
+	err := po.AddFlags(cmd, v)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	return cmd
+}

cmd/syft/cli/packages/packages.go

@@ -0,0 +1,240 @@
+package packages
+
+import (
+	"context"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"strings"
+
+	"github.com/anchore/stereoscope"
+	"github.com/anchore/syft/cmd/syft/cli/eventloop"
+	"github.com/anchore/syft/cmd/syft/cli/options"
+	"github.com/anchore/syft/internal"
+	"github.com/anchore/syft/internal/anchore"
+	"github.com/anchore/syft/internal/bus"
+	"github.com/anchore/syft/internal/config"
+	"github.com/anchore/syft/internal/formats/table"
+	"github.com/anchore/syft/internal/log"
+	"github.com/anchore/syft/internal/ui"
+	"github.com/anchore/syft/internal/version"
+	"github.com/anchore/syft/syft"
+	"github.com/anchore/syft/syft/artifact"
+	"github.com/anchore/syft/syft/event"
+	"github.com/anchore/syft/syft/sbom"
+	"github.com/anchore/syft/syft/source"
+	"github.com/hashicorp/go-multierror"
+	"github.com/wagoodman/go-partybus"
+)
+
+func Run(ctx context.Context, app *config.Application, args []string) error {
+	writer, err := makeWriter(app.Outputs, app.File)
+	if err != nil {
+		return err
+	}
+
+	defer func() {
+		if err := writer.Close(); err != nil {
+			log.Warnf("unable to write to report destination: %w", err)
+		}
+	}()
+
+	// could be an image or a directory, with or without a scheme
+	userInput := args[0]
+	si, err := source.ParseInput(userInput, app.Platform, true)
+	if err != nil {
+		return fmt.Errorf("could not generate source input for packages command: %w", err)
+	}
+
+	eventBus := partybus.NewBus()
+	stereoscope.SetBus(eventBus)
+	syft.SetBus(eventBus)
+
+	return eventloop.EventLoop(
+		execWorker(app, *si, writer),
+		eventloop.SetupSignals(),
+		eventBus.Subscribe(),
+		stereoscope.Cleanup,
+		ui.Select(options.IsVerbose(app), app.Quiet)...,
+	)
+}
+
+func execWorker(app *config.Application, si source.Input, writer sbom.Writer) <-chan error {
+	errs := make(chan error)
+	go func() {
+		defer close(errs)
+
+		src, cleanup, err := source.New(si, app.Registry.ToOptions(), app.Exclusions)
+		if cleanup != nil {
+			defer cleanup()
+		}
+		if err != nil {
+			errs <- fmt.Errorf("failed to construct source from user input %q: %w", si.UserInput, err)
+			return
+		}
+
+		s, err := GenerateSBOM(src, errs, app)
+		if err != nil {
+			errs <- err
+			return
+		}
+
+		if s == nil {
+			errs <- fmt.Errorf("no SBOM produced for %q", si.UserInput)
+		}
+
+		if app.Anchore.Host != "" {
+			if err := runPackageSbomUpload(src, *s, app); err != nil {
+				errs <- err
+				return
+			}
+		}
+
+		bus.Publish(partybus.Event{
+			Type:  event.Exit,
+			Value: func() error { return writer.Write(*s) },
+		})
+	}()
+	return errs
+}
+
+func GenerateSBOM(src *source.Source, errs chan error, app *config.Application) (*sbom.SBOM, error) {
+	tasks, err := eventloop.Tasks(app)
+	if err != nil {
+		return nil, err
+	}
+
+	s := sbom.SBOM{
+		Source: src.Metadata,
+		Descriptor: sbom.Descriptor{
+			Name:          internal.ApplicationName,
+			Version:       version.FromBuild().Version,
+			Configuration: app,
+		},
+	}
+
+	buildRelationships(&s, src, tasks, errs)
+
+	return &s, nil
+}
+
+func buildRelationships(s *sbom.SBOM, src *source.Source, tasks []eventloop.Task, errs chan error) {
+	var relationships []<-chan artifact.Relationship
+	for _, task := range tasks {
+		c := make(chan artifact.Relationship)
+		relationships = append(relationships, c)
+		go eventloop.RunTask(task, &s.Artifacts, src, c, errs)
+	}
+
+	s.Relationships = append(s.Relationships, MergeRelationships(relationships...)...)
+}
+
+func MergeRelationships(cs ...<-chan artifact.Relationship) (relationships []artifact.Relationship) {
+	for _, c := range cs {
+		for n := range c {
+			relationships = append(relationships, n)
+		}
+	}
+
+	return relationships
+}
+
+func runPackageSbomUpload(src *source.Source, s sbom.SBOM, app *config.Application) error {
+	log.Infof("uploading results to %s", app.Anchore.Host)
+
+	if src.Metadata.Scheme != source.ImageScheme {
+		return fmt.Errorf("unable to upload results: only images are supported")
+	}
+
+	var dockerfileContents []byte
+	if app.Anchore.Dockerfile != "" {
+		if _, err := os.Stat(app.Anchore.Dockerfile); os.IsNotExist(err) {
+			return fmt.Errorf("unable dockerfile=%q does not exist: %w", app.Anchore.Dockerfile, err)
+		}
+
+		fh, err := os.Open(app.Anchore.Dockerfile)
+		if err != nil {
+			return fmt.Errorf("unable to open dockerfile=%q: %w", app.Anchore.Dockerfile, err)
+		}
+
+		dockerfileContents, err = ioutil.ReadAll(fh)
+		if err != nil {
+			return fmt.Errorf("unable to read dockerfile=%q: %w", app.Anchore.Dockerfile, err)
+		}
+	}
+
+	c, err := anchore.NewClient(anchore.Configuration{
+		BaseURL:  app.Anchore.Host,
+		Username: app.Anchore.Username,
+		Password: app.Anchore.Password,
+	})
+
+	if err != nil {
+		return fmt.Errorf("failed to create anchore client: %w", err)
+	}
+
+	importCfg := anchore.ImportConfig{
+		ImageMetadata:           src.Image.Metadata,
+		SBOM:                    s,
+		Dockerfile:              dockerfileContents,
+		OverwriteExistingUpload: app.Anchore.OverwriteExistingImage,
+		Timeout:                 app.Anchore.ImportTimeout,
+	}
+
+	if err := c.Import(context.Background(), importCfg); err != nil {
+		return fmt.Errorf("failed to upload results to host=%s: %+v", app.Anchore.Host, err)
+	}
+
+	return nil
+}
+
+// makeWriter creates a sbom.Writer for output or returns an error. this will either return a valid writer
+// or an error but neither both and if there is no error, sbom.Writer.Close() should be called
+func makeWriter(outputs []string, defaultFile string) (sbom.Writer, error) {
+	outputOptions, err := parseOptions(outputs, defaultFile)
+	if err != nil {
+		return nil, err
+	}
+
+	writer, err := sbom.NewWriter(outputOptions...)
+	if err != nil {
+		return nil, err
+	}
+
+	return writer, nil
+}
+
+// parseOptions utility to parse command-line option strings and retain the existing behavior of default format and file
+func parseOptions(outputs []string, defaultFile string) (out []sbom.WriterOption, errs error) {
+	// always should have one option -- we generally get the default of "table", but just make sure
+	if len(outputs) == 0 {
+		outputs = append(outputs, string(table.ID))
+	}
+
+	for _, name := range outputs {
+		name = strings.TrimSpace(name)
+
+		// split to at most two parts for <format>=<file>
+		parts := strings.SplitN(name, "=", 2)
+
+		// the format name is the first part
+		name = parts[0]
+
+		// default to the --file or empty string if not specified
+		file := defaultFile
+
+		// If a file is specified as part of the output formatName, use that
+		if len(parts) > 1 {
+			file = parts[1]
+		}
+
+		format := syft.FormatByName(name)
+		if format == nil {
+			errs = multierror.Append(errs, fmt.Errorf("bad output format: '%s'", name))
+			continue
+		}
+
+		out = append(out, sbom.NewWriterOption(format, file))
+	}
+	return out, errs
+}

cmd/syft/cli/poweruser.go

@@ -0,0 +1,49 @@
+package cli
+
+import (
+	"fmt"
+
+	"github.com/anchore/syft/cmd/syft/cli/options"
+	"github.com/anchore/syft/cmd/syft/cli/poweruser"
+	"github.com/anchore/syft/internal"
+	"github.com/anchore/syft/internal/config"
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+)
+
+const powerUserExample = `  {{.appName}} {{.command}} <image>
+  DEPRECATED - THIS COMMAND WILL BE REMOVED in v1.0.0
+  Only image sources are supported (e.g. docker: , podman: , docker-archive: , oci: , etc.), the directory source (dir:) is not supported.
+  All behavior is controlled via application configuration and environment variables (see https://github.com/anchore/syft#configuration)
+`
+
+func PowerUser(v *viper.Viper, app *config.Application, ro *options.RootOptions) *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "power-user [IMAGE]",
+		Short: "Run bulk operations on container images",
+		Example: internal.Tprintf(powerUserExample, map[string]interface{}{
+			"appName": internal.ApplicationName,
+			"command": "power-user",
+		}),
+		Args: func(cmd *cobra.Command, args []string) error {
+			if err := app.LoadAllValues(v, ro.Config); err != nil {
+				return fmt.Errorf("invalid application config: %v", err)
+			}
+			// configure logging for command
+			newLogWrapper(app)
+			logApplicationConfig(app)
+			return validateArgs(cmd, args)
+		},
+		Hidden:        true,
+		SilenceUsage:  true,
+		SilenceErrors: true,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			if app.CheckForAppUpdate {
+				checkForApplicationUpdate()
+			}
+			return poweruser.Run(cmd.Context(), app, args)
+		},
+	}
+
+	return cmd
+}

cmd/syft/cli/poweruser/poweruser.go

@@ -0,0 +1,116 @@
+package poweruser
+
+import (
+	"context"
+	"fmt"
+	"os"
+
+	"github.com/anchore/stereoscope"
+	"github.com/anchore/syft/cmd/syft/cli/eventloop"
+	"github.com/anchore/syft/cmd/syft/cli/options"
+	"github.com/anchore/syft/cmd/syft/cli/packages"
+	"github.com/anchore/syft/internal"
+	"github.com/anchore/syft/internal/bus"
+	"github.com/anchore/syft/internal/config"
+	"github.com/anchore/syft/internal/formats/syftjson"
+	"github.com/anchore/syft/internal/log"
+	"github.com/anchore/syft/internal/ui"
+	"github.com/anchore/syft/internal/version"
+	"github.com/anchore/syft/syft"
+	"github.com/anchore/syft/syft/artifact"
+	"github.com/anchore/syft/syft/event"
+	"github.com/anchore/syft/syft/sbom"
+	"github.com/anchore/syft/syft/source"
+	"github.com/gookit/color"
+	"github.com/wagoodman/go-partybus"
+)
+
+func Run(ctx context.Context, app *config.Application, args []string) error {
+	writer, err := sbom.NewWriter(sbom.WriterOption{
+		Format: syftjson.Format(),
+		Path:   app.File,
+	})
+	if err != nil {
+		return err
+	}
+
+	defer func() {
+		if err := writer.Close(); err != nil {
+			log.Warnf("unable to write to report destination: %+v", err)
+		}
+
+		// inform user at end of run that command will be removed
+		deprecated := color.Style{color.Red, color.OpBold}.Sprint("DEPRECATED: This command will be removed in v1.0.0")
+		fmt.Fprintln(os.Stderr, deprecated)
+	}()
+
+	userInput := args[0]
+	si, err := source.ParseInput(userInput, app.Platform, true)
+	if err != nil {
+		return fmt.Errorf("could not generate source input for packages command: %w", err)
+	}
+
+	eventBus := partybus.NewBus()
+	stereoscope.SetBus(eventBus)
+	syft.SetBus(eventBus)
+
+	return eventloop.EventLoop(
+		execWorker(app, *si, writer),
+		eventloop.SetupSignals(),
+		eventBus.Subscribe(),
+		stereoscope.Cleanup,
+		ui.Select(options.IsVerbose(app), app.Quiet)...,
+	)
+}
+
+func execWorker(app *config.Application, si source.Input, writer sbom.Writer) <-chan error {
+	errs := make(chan error)
+	go func() {
+		defer close(errs)
+
+		app.Secrets.Cataloger.Enabled = true
+		app.FileMetadata.Cataloger.Enabled = true
+		app.FileContents.Cataloger.Enabled = true
+		app.FileClassification.Cataloger.Enabled = true
+		tasks, err := eventloop.Tasks(app)
+		if err != nil {
+			errs <- err
+			return
+		}
+
+		src, cleanup, err := source.New(si, app.Registry.ToOptions(), app.Exclusions)
+		if err != nil {
+			errs <- err
+			return
+		}
+		if cleanup != nil {
+			defer cleanup()
+		}
+
+		s := sbom.SBOM{
+			Source: src.Metadata,
+			Descriptor: sbom.Descriptor{
+				Name:          internal.ApplicationName,
+				Version:       version.FromBuild().Version,
+				Configuration: app,
+			},
+		}
+
+		var relationships []<-chan artifact.Relationship
+		for _, task := range tasks {
+			c := make(chan artifact.Relationship)
+			relationships = append(relationships, c)
+
+			go eventloop.RunTask(task, &s.Artifacts, src, c, errs)
+		}
+
+		s.Relationships = append(s.Relationships, packages.MergeRelationships(relationships...)...)
+
+		bus.Publish(partybus.Event{
+			Type:  event.Exit,
+			Value: func() error { return writer.Write(s) },
+		})
+	}()
+
+	return errs
+}

cmd/syft/cli/version.go

@@ -0,0 +1,71 @@
+package cli
+
+import (
+	"encoding/json"
+	"fmt"
+	"log"
+	"os"
+
+	"github.com/anchore/syft/cmd/syft/cli/options"
+	"github.com/anchore/syft/internal"
+	"github.com/anchore/syft/internal/config"
+	"github.com/anchore/syft/internal/version"
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+)
+
+func Version(v *viper.Viper, app *config.Application) *cobra.Command {
+	o := &options.VersionOptions{}
+	cmd := &cobra.Command{
+		Use:   "version",
+		Short: "show the version",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			return printVersion(o.Output)
+		},
+	}
+
+	err := o.AddFlags(cmd, v)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	return cmd
+}
+
+func printVersion(output string) error {
+	versionInfo := version.FromBuild()
+
+	switch output {
+	case "text":
+		fmt.Println("Application:       ", internal.ApplicationName)
+		fmt.Println("Version:           ", versionInfo.Version)
+		fmt.Println("JsonSchemaVersion: ", internal.JSONSchemaVersion)
+		fmt.Println("BuildDate:         ", versionInfo.BuildDate)
+		fmt.Println("GitCommit:         ", versionInfo.GitCommit)
+		fmt.Println("GitDescription:    ", versionInfo.GitDescription)
+		fmt.Println("Platform:          ", versionInfo.Platform)
+		fmt.Println("GoVersion:         ", versionInfo.GoVersion)
+		fmt.Println("Compiler:          ", versionInfo.Compiler)
+
+	case "json":
+		enc := json.NewEncoder(os.Stdout)
+		enc.SetEscapeHTML(false)
+		enc.SetIndent("", " ")
+		err := enc.Encode(&struct {
+			version.Version
+			Application string `json:"application"`
+		}{
+			Version:     versionInfo,
+			Application: internal.ApplicationName,
+		})
+		if err != nil {
+			fmt.Printf("failed to show version information: %+v\n", err)
+			os.Exit(1)
+		}
+	default:
+		fmt.Printf("unsupported output format: %s\n", output)
+		os.Exit(1)
+	}
+
+	return nil
+}

cmd/syft/main.go

@@ -0,0 +1,18 @@
+package main
+
+import (
+	"log"
+
+	"github.com/anchore/syft/cmd/syft/cli"
+)
+
+func main() {
+	cli, err := cli.New()
+	if err != nil {
+		log.Fatalf("error during command construction: %v", err)
+	}
+
+	if err := cli.Execute(); err != nil {
+		log.Fatalf("error during command execution: %v", err)
+	}
+}