Display which provider caused which error in output (#2757)

* Display which provider caused which error in output

Otherwise, the output is very difficult to parse.

Signed-off-by: Will Murphy <will.murphy@anchore.com>

* lint fix

Signed-off-by: Will Murphy <will.murphy@anchore.com>

* bump stereoscope to v0.0.2

Signed-off-by: Will Murphy <will.murphy@anchore.com>

---------

Signed-off-by: Will Murphy <will.murphy@anchore.com>

go.mod

@@ -17,7 +17,7 @@ require (
 	github.com/anchore/go-testutils v0.0.0-20200925183923-d5f45b0d3c04
 	github.com/anchore/go-version v1.2.2-0.20200701162849-18adb9c92b9b
 	github.com/anchore/packageurl-go v0.1.1-0.20240312213626-055233e539b4
-	github.com/anchore/stereoscope v0.0.2-0.20240229175558-fe426d1b1c84
+	github.com/anchore/stereoscope v0.0.2
 	github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be
 	// we are hinting brotli to latest due to warning when installing archiver v3:
 	// go: warning: github.com/andybalholm/brotli@v1.0.1: retracted by module author: occasional panics and data corruption

go.sum

@@ -111,8 +111,8 @@ github.com/anchore/go-version v1.2.2-0.20200701162849-18adb9c92b9b h1:e1bmaoJfZV
 github.com/anchore/go-version v1.2.2-0.20200701162849-18adb9c92b9b/go.mod h1:Bkc+JYWjMCF8OyZ340IMSIi2Ebf3uwByOk6ho4wne1E=
 github.com/anchore/packageurl-go v0.1.1-0.20240312213626-055233e539b4 h1:SjemQ90fgflz39HG+VMkNfrpUVJpcFW6ZFA3TDXqzBM=
 github.com/anchore/packageurl-go v0.1.1-0.20240312213626-055233e539b4/go.mod h1:Blo6OgJNiYF41ufcgHKkbCKF2MDOMlrqhXv/ij6ocR4=
-github.com/anchore/stereoscope v0.0.2-0.20240229175558-fe426d1b1c84 h1:/E74wU51M87fX5UWHubLZiENXbuAci+xtbSb+JFsIYg=
+github.com/anchore/stereoscope v0.0.2 h1:UTFHB/I3w7dfKvgf0K8+3T5MLZ5/hGhgbNUPVU4T26s=
-github.com/anchore/stereoscope v0.0.2-0.20240229175558-fe426d1b1c84/go.mod h1:evQiJMQG56Z7/L5uhA8kfhhjF6ESJUZzUH9ms6bQ2Co=
+github.com/anchore/stereoscope v0.0.2/go.mod h1:ckIamHiRMp8iBwWoTtE5Xkt9VQ5QC+6+O4VzwqyZr5Q=
 github.com/andreyvit/diff v0.0.0-20170406064948-c7f18ee00883/go.mod h1:rCTlJbsFo29Kk6CurOXKm700vrz8f0KW0JNfpkRJY/8=
 github.com/andybalholm/brotli v1.0.1/go.mod h1:loMXtMfwqflxFJPmdbJO0a3KNoPuLBgiu3qAvBg8x/Y=
 github.com/andybalholm/brotli v1.0.4 h1:V7DdXeJtZscaqfNuAdSRuRFzuiKlHSC/Zh3zl9qY3JY=

syft/get_source.go

@@ -5,6 +5,7 @@ import (
 	"errors"
 	"fmt"
 	"os"
+	"strings"
 
 	"github.com/anchore/syft/syft/source"
 )
@@ -21,21 +22,16 @@ func GetSource(ctx context.Context, userInput string, cfg *GetSourceConfig) (sou
 	}
 
 	var errs []error
-	var fileNotfound error
+	var fileNotFoundProviders []string
 
 	// call each source provider until we find a valid source
 	for _, p := range providers {
 		src, err := p.Provide(ctx)
 		if err != nil {
-			err = eachError(err, func(err error) error {
 			if errors.Is(err, os.ErrNotExist) {
-					fileNotfound = err
+				fileNotFoundProviders = append(fileNotFoundProviders, p.Name())
-					return nil
+			} else {
-				}
+				errs = append(errs, fmt.Errorf("%s: %w", p.Name(), err))
-				return err
-			})
-			if err != nil {
-				errs = append(errs, err)
 			}
 		}
 		if src != nil {
@@ -52,8 +48,8 @@ func GetSource(ctx context.Context, userInput string, cfg *GetSourceConfig) (sou
 		}
 	}
 
-	if fileNotfound != nil {
+	if len(fileNotFoundProviders) > 0 {
-		errs = append([]error{fileNotfound}, errs...)
+		errs = append(errs, fmt.Errorf("additionally, the following providers failed with %w: %s", os.ErrNotExist, strings.Join(fileNotFoundProviders, ", ")))
 	}
 	return nil, sourceError(userInput, errs...)
 }
@@ -71,31 +67,3 @@ func sourceError(userInput string, errs ...error) error {
 	}
 	return fmt.Errorf("errors occurred attempting to resolve '%s':%s", userInput, errorTexts)
 }
-
-func eachError(err error, fn func(error) error) error {
-	out := fn(err)
-	// unwrap singly wrapped errors
-	if e, ok := err.(interface {
-		Unwrap() error
-	}); ok {
-		wrapped := e.Unwrap()
-		got := eachError(wrapped, fn)
-		// return the outer error if received the same wrapped error
-		if errors.Is(got, wrapped) {
-			return err
-		}
-		return got
-	}
-	// unwrap errors from errors.Join
-	if errs, ok := err.(interface {
-		Unwrap() []error
-	}); ok {
-		for _, e := range errs.Unwrap() {
-			e = eachError(e, fn)
-			if e != nil {
-				out = errors.Join(out, e)
-			}
-		}
-	}
-	return out
-}