added/updated logging for serve and remove (#487)

* added error logging for hauler store serve
* updated logging for hauler store remove to match others
* added more error logging for user responses

cmd/hauler/cli/store/remove.go

@@ -1,8 +1,12 @@
 package store
 
 import (
+	"bufio"
 	"context"
+	"errors"
 	"fmt"
+	"io"
+	"os"
 	"strings"
 
 	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
@@ -67,43 +71,49 @@ func RemoveCmd(ctx context.Context, o *flags.RemoveOpts, s *store.Layout, ref st
 	if len(matches) >= 1 {
 		l.Infof("found %d matching references:", len(matches))
 		for _, m := range matches {
-			l.Infof(" - %s", formatReference(m.reference))
+			l.Infof("  - [%s]", formatReference(m.reference))
 		}
 	}
 
 	if !o.Force {
-		fmt.Printf("are you sure you want to remove [%d] artifact(s) from the store? (yes/no) ", len(matches))
+		fmt.Printf("  ↳ are you sure you want to remove [%d] artifact(s) from the store? (yes/no) ", len(matches))
 
-		var response string
-		_, err := fmt.Scanln(&response)
-		if err != nil {
-			return fmt.Errorf("failed to read response: %w", err)
+		reader := bufio.NewReader(os.Stdin)
+
+		line, err := reader.ReadString('\n')
+		if err != nil && !errors.Is(err, io.EOF) {
+			return fmt.Errorf("failed to read response: [%w]... please answer 'yes' or 'no'", err)
 		}
+
+		response := strings.ToLower(strings.TrimSpace(line))
+
 		switch response {
 		case "yes", "y":
 			l.Infof("starting to remove artifacts from store...")
 		case "no", "n":
 			l.Infof("successfully cancelled removal of artifacts from store")
 			return nil
+		case "":
+			return fmt.Errorf("failed to read response... please answer 'yes' or 'no'")
 		default:
-			return fmt.Errorf("invalid response '%s' - please answer 'yes' or 'no'", response)
+			return fmt.Errorf("invalid response [%s]... please answer 'yes' or 'no'", response)
 		}
 	}
 
 	// remove artifact(s)
 	for _, m := range matches {
 		if err := s.RemoveArtifact(ctx, m.reference, m.desc); err != nil {
-			return fmt.Errorf("failed to remove artifact %s: %w", formatReference(m.reference), err)
+			return fmt.Errorf("failed to remove artifact [%s]: %w", formatReference(m.reference), err)
 		}
 
 		l.Infof("successfully removed [%s] of type [%s] with digest [%s]", formatReference(m.reference), m.desc.MediaType, m.desc.Digest.String())
 	}
 
 	// clean up unreferenced blobs
-	l.Infof("cleaning up unreferenced blobs...")
+	l.Infof("cleaning up all unreferenced blobs...")
 	removedCount, removedSize, err := s.CleanUp(ctx)
 	if err != nil {
-		l.Warnf("garbage collection failed: %v", err)
+		l.Warnf("garbage collection failed: [%v]", err)
 	} else if removedCount > 0 {
 		l.Infof("successfully removed [%d] unreferenced blobs [freed %d bytes]", removedCount, removedSize)
 	}

cmd/hauler/cli/store/serve.go

@@ -2,9 +2,12 @@ package store
 
 import (
 	"context"
+	"errors"
 	"fmt"
+	"io/fs"
 	"net/http"
 	"os"
+	"path/filepath"
 	"strings"
 
 	"github.com/distribution/distribution/v3/configuration"
@@ -21,6 +24,37 @@ import (
 	"hauler.dev/go/hauler/pkg/store"
 )
 
+func validateStoreExists(s *store.Layout) error {
+	indexPath := filepath.Join(s.Root, "index.json")
+
+	_, err := os.Stat(indexPath)
+	if err == nil {
+		return nil
+	}
+
+	if errors.Is(err, fs.ErrNotExist) {
+		return fmt.Errorf(
+			"no store found at [%s]\n  ↳ does the hauler store exist? (verify with `hauler store info`)",
+			s.Root,
+		)
+	}
+
+	return fmt.Errorf(
+		"unable to access store at [%s]: %w",
+		s.Root,
+		err,
+	)
+}
+
+func loadConfig(filename string) (*configuration.Configuration, error) {
+	f, err := os.Open(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	return configuration.Parse(f)
+}
+
 func DefaultRegistryConfig(o *flags.ServeRegistryOpts, rso *flags.StoreRootOpts, ro *flags.CliRootOpts) *configuration.Configuration {
 	cfg := &configuration.Configuration{
 		Version: "0.1",
@@ -53,6 +87,10 @@ func ServeRegistryCmd(ctx context.Context, o *flags.ServeRegistryOpts, s *store.
 	l := log.FromContext(ctx)
 	ctx = dcontext.WithVersion(ctx, version.Version)
 
+	if err := validateStoreExists(s); err != nil {
+		return err
+	}
+
 	tr := server.NewTempRegistry(ctx, o.RootDir)
 	if err := tr.Start(); err != nil {
 		return err
@@ -101,6 +139,10 @@ func ServeFilesCmd(ctx context.Context, o *flags.ServeFilesOpts, s *store.Layout
 	l := log.FromContext(ctx)
 	ctx = dcontext.WithVersion(ctx, version.Version)
 
+	if err := validateStoreExists(s); err != nil {
+		return err
+	}
+
 	opts := &flags.CopyOpts{}
 	if err := CopyCmd(ctx, opts, s, "dir://"+o.RootDir, ro); err != nil {
 		return err
@@ -125,12 +167,3 @@ func ServeFilesCmd(ctx context.Context, o *flags.ServeFilesOpts, s *store.Layout
 
 	return nil
 }
-
-func loadConfig(filename string) (*configuration.Configuration, error) {
-	f, err := os.Open(filename)
-	if err != nil {
-		return nil, err
-	}
-
-	return configuration.Parse(f)
-}