[debug] Add cache credentials flag and more perf profiling (#2065)

## Summary

Credentials command is hidden, this flag can help debugging.

## How was it tested?

Author: mikeland73

internal/boxcli/cache.go

@@ -24,6 +24,10 @@ type cacheFlags struct {
 	to string
 }
 
+type credentialsFlags struct {
+	format string
+}
+
 func cacheCmd() *cobra.Command {
 	flags := cacheFlags{}
 	cacheCommand := &cobra.Command{
@@ -93,7 +97,8 @@ func cacheConfigureCmd() *cobra.Command {
 }
 
 func cacheCredentialsCmd() *cobra.Command {
-	return &cobra.Command{
+	flags := credentialsFlags{}
+	cmd := &cobra.Command{
 		Use:    "credentials",
 		Short:  "Output S3 cache credentials",
 		Hidden: true,
@@ -103,6 +108,14 @@ func cacheCredentialsCmd() *cobra.Command {
 			if err != nil {
 				return err
 			}
+
+			if flags.format == "sh" {
+				fmt.Printf("export AWS_ACCESS_KEY_ID=%q\n", creds.AccessKeyID)
+				fmt.Printf("export AWS_SECRET_ACCESS_KEY=%q\n", creds.SecretAccessKey)
+				fmt.Printf("export AWS_SESSION_TOKEN=%q\n", creds.SessionToken)
+				return nil
+			}
+
 			out, err := json.Marshal(creds)
 			if err != nil {
 				return err
@@ -111,6 +124,8 @@ func cacheCredentialsCmd() *cobra.Command {
 			return err
 		},
 	}
+	cmd.Flags().StringVar(&flags.format, "format", "json", "Output format, either json or sh")
+	return cmd
 }
 
 func cacheInfoCmd() *cobra.Command {

internal/devbox/packages.go

@@ -394,6 +394,7 @@ func resetProfileDirForFlakes(profileDir string) (err error) {
 }
 
 func (d *Devbox) installPackages(ctx context.Context, mode installMode) error {
+	defer debug.FunctionTimer().End()
 	// Create plugin directories first because packages might need them
 	for _, pluginConfig := range d.Config().IncludedPluginConfigs() {
 		if err := d.PluginManager().CreateFilesForConfig(pluginConfig); err != nil {
@@ -430,6 +431,7 @@ func (d *Devbox) InstallRunXPackages(ctx context.Context) error {
 // packages will be available in the nix store when computing the devbox environment
 // and installing in the nix profile (even if offline).
 func (d *Devbox) installNixPackagesToStore(ctx context.Context, mode installMode) error {
+	defer debug.FunctionTimer().End()
 	packages, err := d.packagesToInstallInStore(ctx, mode)
 	if err != nil || len(packages) == 0 {
 		return err
@@ -526,6 +528,7 @@ func (d *Devbox) installNixPackagesToStore(ctx context.Context, mode installMode
 }
 
 func (d *Devbox) packagesToInstallInStore(ctx context.Context, mode installMode) ([]*devpkg.Package, error) {
+	defer debug.FunctionTimer().End()
 	// First, get and prepare all the packages that must be installed in this project
 	// and remove non-nix packages from the list
 	packages := lo.Filter(d.InstallablePackages(), devpkg.IsNix)

internal/devpkg/narinfo_cache.go

@@ -12,6 +12,7 @@ import (
 
 	"github.com/pkg/errors"
 	"go.jetpack.io/devbox/internal/boxcli/featureflag"
+	"go.jetpack.io/devbox/internal/debug"
 	"go.jetpack.io/devbox/internal/lock"
 	"go.jetpack.io/devbox/internal/nix"
 	"golang.org/x/sync/errgroup"
@@ -53,6 +54,7 @@ func (p *Package) IsInBinaryCache() (bool, error) {
 // package in the list, and caches the result.
 // Callers of IsInBinaryCache may call this function first as a perf-optimization.
 func FillNarInfoCache(ctx context.Context, packages ...*Package) error {
+	defer debug.FunctionTimer().End()
 	if !featureflag.RemoveNixpkgs.Enabled() {
 		return nil
 	}

internal/nix/build.go

@@ -21,6 +21,7 @@ type BuildArgs struct {
 }
 
 func Build(ctx context.Context, args *BuildArgs, installables ...string) error {
+	defer debug.FunctionTimer().End()
 	// --impure is required for allowUnfreeEnv/allowInsecureEnv to work.
 	cmd := commandContext(ctx, "build", "--impure")
 	cmd.Args = append(cmd.Args, args.Flags...)

internal/nix/store.go

@@ -24,6 +24,7 @@ func StorePathFromHashPart(ctx context.Context, hash, storeAddr string) (string,
 }
 
 func StorePathsFromInstallable(ctx context.Context, installable string, allowInsecure bool) ([]string, error) {
+	defer debug.FunctionTimer().End()
 	// --impure for NIXPKGS_ALLOW_UNFREE
 	cmd := commandContext(ctx, "path-info", installable, "--json", "--impure")
 	cmd.Env = allowUnfreeEnv(os.Environ())
@@ -53,6 +54,7 @@ func StorePathsFromInstallable(ctx context.Context, installable string, allowIns
 // StorePathsAreInStore returns true if the store path is in the store
 // It relies on `nix store ls` to check if the store path is in the store
 func StorePathsAreInStore(ctx context.Context, storePaths []string) (bool, error) {
+	defer debug.FunctionTimer().End()
 	for _, storePath := range storePaths {
 		cmd := commandContext(ctx, "store", "ls", storePath)
 		debug.Log("Running cmd %s", cmd)