Power user command support for directory scans (#467)

* Power-user directory source support
Signed-off-by: Mikey Strauss <mikey@scribe-security.com>

Signed-off-by: houdini91 <mdstrauss91@gmail.com>

* Remove newline

Signed-off-by: houdini91 <mdstrauss91@gmail.com>

* Shared filetree (#1)

* Shared directory resolver filetree

Signed-off-by: houdini91 <mdstrauss91@gmail.com>

* PR - change error ErrObserve to ErrPath

Signed-off-by: houdini91 <mdstrauss91@gmail.com>

* PR - share directory resolver
* Use pointer to source struct

Signed-off-by: houdini91 <mdstrauss91@gmail.com>

* Fix Lint

Signed-off-by: houdini91 <mdstrauss91@gmail.com>

syft/file/classification_cataloger_test.go

@@ -118,11 +118,18 @@ func TestClassifierCataloger_DefaultClassifiers_PositiveCases(t *testing.T) {
 
 			loc := source.NewLocation(test.location)
 
-			if _, ok := actualResults[loc]; !ok {
+			ok := false
+			for actual_loc, actual_classification := range actualResults {
+				if loc.RealPath == actual_loc.RealPath {
+					ok = true
+					assert.Equal(t, test.expected, actual_classification)
+				}
+			}
+
+			if !ok {
 				t.Fatalf("could not find test location=%q", test.location)
 			}
 
-			assert.Equal(t, test.expected, actualResults[loc])
 		})
 	}
 }

syft/file/contents_cataloger.go

@@ -3,7 +3,6 @@ package file
 import (
 	"bytes"
 	"encoding/base64"
-	"fmt"
 	"io"
 
 	"github.com/anchore/syft/internal"
@@ -32,7 +31,6 @@ func (i *ContentsCataloger) Catalog(resolver source.FileResolver) (map[source.Lo
 	if err != nil {
 		return nil, err
 	}
-
 	for _, location := range locations {
 		metadata, err := resolver.FileMetadataByLocation(location)
 		if err != nil {
@@ -44,6 +42,10 @@ func (i *ContentsCataloger) Catalog(resolver source.FileResolver) (map[source.Lo
 		}
 
 		result, err := i.catalogLocation(resolver, location)
+		if internal.IsErrPathPermission(err) {
+			log.Debugf("file contents cataloger skipping - %+v", err)
+			continue
+		}
 		if err != nil {
 			return nil, err
 		}
@@ -63,7 +65,7 @@ func (i *ContentsCataloger) catalogLocation(resolver source.FileResolver, locati
 
 	buf := &bytes.Buffer{}
 	if _, err = io.Copy(base64.NewEncoder(base64.StdEncoding, buf), contentReader); err != nil {
-		return "", fmt.Errorf("unable to observe contents of %+v: %w", location.RealPath, err)
+		return "", internal.ErrPath{Path: location.RealPath, Err: err}
 	}
 
 	return buf.String(), nil

syft/file/digest_cataloger.go

@@ -39,6 +39,11 @@ func (i *DigestsCataloger) Catalog(resolver source.FileResolver) (map[source.Loc
 	for _, location := range locations {
 		stage.Current = location.RealPath
 		result, err := i.catalogLocation(resolver, location)
+		if internal.IsErrPathPermission(err) {
+			log.Debugf("file digests cataloger skipping - %+v", err)
+			continue
+		}
+
 		if err != nil {
 			return nil, err
 		}
@@ -67,7 +72,7 @@ func (i *DigestsCataloger) catalogLocation(resolver source.FileResolver, locatio
 
 	size, err := io.Copy(io.MultiWriter(writers...), contentReader)
 	if err != nil {
-		return nil, fmt.Errorf("unable to observe contents of %+v: %+v", location.RealPath, err)
+		return nil, internal.ErrPath{Path: location.RealPath, Err: err}
 	}
 
 	if size == 0 {

syft/file/secrets_cataloger.go

@@ -50,6 +50,11 @@ func (i *SecretsCataloger) Catalog(resolver source.FileResolver) (map[source.Loc
 	for _, location := range locations {
 		stage.Current = location.RealPath
 		result, err := i.catalogLocation(resolver, location)
+		if internal.IsErrPathPermission(err) {
+			log.Debugf("secrets cataloger skipping - %+v", err)
+			continue
+		}
+
 		if err != nil {
 			return nil, err
 		}
@@ -77,7 +82,7 @@ func (i *SecretsCataloger) catalogLocation(resolver source.FileResolver, locatio
 	// TODO: in the future we can swap out search strategies here
 	secrets, err := catalogLocationByLine(resolver, location, i.patterns)
 	if err != nil {
-		return nil, err
+		return nil, internal.ErrPath{Path: location.RealPath, Err: err}
 	}
 
 	if i.revealValues {