errors: standardize error wrapping for Fatal errors

* replace all occurences of  `errors.Fatal(err.Error())` with `errors.Fatalf("%s", err)` so that the error wrapping is correct across the codebase

* updated the review comments

cmd/restic/cmd_copy.go

@@ -250,7 +250,7 @@ func copyTree(ctx context.Context, srcRepo restic.Repository, dstRepo restic.Rep
 	)
 	bar.Done()
 	if err != nil {
-		return errors.Fatal(err.Error())
+		return errors.Fatalf("%s", err)
 	}
 	return nil
 }

cmd/restic/cmd_diff.go

@@ -72,7 +72,7 @@ func (opts *DiffOptions) AddFlags(f *pflag.FlagSet) {
 func loadSnapshot(ctx context.Context, be restic.Lister, repo restic.LoaderUnpacked, desc string) (*restic.Snapshot, string, error) {
 	sn, subfolder, err := restic.FindSnapshot(ctx, be, repo, desc)
 	if err != nil {
-		return nil, "", errors.Fatal(err.Error())
+		return nil, "", errors.Fatalf("%s", err)
 	}
 	return sn, subfolder, err
 }

cmd/restic/cmd_init.go

@@ -101,7 +101,7 @@ func runInit(ctx context.Context, opts InitOptions, gopts GlobalOptions, args []
 		PackSize:    gopts.PackSize * 1024 * 1024,
 	})
 	if err != nil {
-		return errors.Fatal(err.Error())
+		return errors.Fatalf("%s", err)
 	}
 
 	err = s.Init(ctx, version, gopts.password, chunkerPolynomial)

cmd/restic/global.go

@@ -486,7 +486,7 @@ func OpenRepository(ctx context.Context, opts GlobalOptions) (*repository.Reposi
 		NoExtraVerify: opts.NoExtraVerify,
 	})
 	if err != nil {
-		return nil, errors.Fatal(err.Error())
+		return nil, errors.Fatalf("%s", err)
 	}
 
 	passwordTriesLeft := 1
@@ -613,7 +613,7 @@ func innerOpen(ctx context.Context, s string, gopts GlobalOptions, opts options.
 
 	rt, err := backend.Transport(globalOptions.TransportOptions)
 	if err != nil {
-		return nil, errors.Fatal(err.Error())
+		return nil, errors.Fatalf("%s", err)
 	}
 
 	// wrap the transport so that the throughput via HTTP is limited

internal/repository/prune.go

@@ -567,7 +567,7 @@ func (plan *PrunePlan) Execute(ctx context.Context, printer progress.Printer) er
 		_, err := Repack(ctx, repo, repo, plan.repackPacks, plan.keepBlobs, bar, printer.P)
 		bar.Done()
 		if err != nil {
-			return errors.Fatal(err.Error())
+			return errors.Fatalf("%s", err)
 		}
 
 		// Also remove repacked packs