fix: unknowns, better full vs local path handling

Signed-off-by: Keith Zantow <kzantow@gmail.com>

internal/unknown/path_error.go

@@ -2,6 +2,7 @@ package unknown
 
 import (
 	"regexp"
+	"strings"
 
 	"github.com/anchore/syft/internal/log"
 	"github.com/anchore/syft/syft/file"
@@ -19,7 +20,7 @@ func ProcessPathErrors(err error) error {
 	if pathErrorRegex.MatchString(errText) {
 		foundPath := pathErrorRegex.ReplaceAllString(err.Error(), "$1")
 		if foundPath != "" {
-			return New(file.NewLocation(foundPath), err)
+			return New(file.NewLocationFromCoordinates(pathCoordinates(foundPath)), err)
 		}
 	}
 	unknowns, remainingErrors := ExtractCoordinateErrors(err)
@@ -31,3 +32,13 @@ func ProcessPathErrors(err error) error {
 	}
 	return Join(out...)
 }
+
+// pathCoordinates names the file at a path from a resolver error, which for a file within an archive is
+// a full path: the real path is what precedes the first archive separator.
+func pathCoordinates(p string) file.Coordinates {
+	realPath, _, nested := strings.Cut(p, file.ArchivePathSeparator)
+	if !nested {
+		return file.NewCoordinates(p, "")
+	}
+	return file.Coordinates{RealPath: realPath, FullPath: p}
+}