Count every file of each version in secret info's Total Size (closes #147)

Total Size added up each version's data.age and metadata.age, but a
version keeps its value in value.age, so no secret's value was counted.
It now adds up every file in each version directory: the value, the
metadata and the version's two keys, as the plan on the issue decided.
A version directory that cannot be read adds nothing and gets a warning
naming it.

The new tests add a 10000-byte secret and check that the total grows by
at least that much, and check the warning for a version directory that
cannot be read.

Model: opus-5-5

internal/cli/info_helper.go

@@ -18,24 +18,23 @@ type vaultStats struct {
 
 // addVersion accumulates size and timestamp info for one version directory
 func (s *vaultStats) addVersion(fs afero.Fs, versionPath string) {
-	// Add size of encrypted data
-	dataPath := filepath.Join(versionPath, "data.age")
-
-	stat, err := fs.Stat(dataPath)
-	if err == nil {
-		s.totalSize += stat.Size()
+	// Add the size of every file in the version directory: its value,
+	// metadata and keys. A directory that cannot be read adds nothing and
+	// gets a warning; its timestamp is still tracked below.
+	files, err := afero.ReadDir(fs, versionPath)
+	if err != nil {
+		secret.Warn("Could not read version directory",
+			"directory", versionPath, "error", err)
 	}
 
-	// Add size of metadata
-	metaPath := filepath.Join(versionPath, "metadata.age")
-
-	stat, err = fs.Stat(metaPath)
-	if err == nil {
-		s.totalSize += stat.Size()
+	for _, file := range files {
+		if !file.IsDir() {
+			s.totalSize += file.Size()
+		}
 	}
 
 	// Track timestamps
-	stat, err = fs.Stat(versionPath)
+	stat, err := fs.Stat(versionPath)
 	if err == nil {
 		modTime := stat.ModTime()
 		if s.oldestTime.IsZero() || modTime.Before(s.oldestTime) {

internal/cli/info_helper_test.go

@@ -0,0 +1,51 @@
+//nolint:testpackage // white-box test of unexported internals
+package cli
+
+import (
+	"io"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/spf13/afero"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+// TestAddVersionWarnsWhenVersionDirUnreadable asserts that a version
+// directory that cannot be listed, so that its files are left out of the
+// total size, gets a warning naming it and the error, and that its
+// timestamp is still tracked.
+//
+//nolint:paralleltest // replaces os.Stderr, where secret.Warn writes
+func TestAddVersionWarnsWhenVersionDirUnreadable(t *testing.T) {
+	versionDir := filepath.Join(testVaultDir(listTestVaultName),
+		unreadableTestSecretsDirName, unreadableTestSecretName,
+		"versions", "20260809.001")
+
+	base := afero.NewMemMapFs()
+	require.NoError(t, base.MkdirAll(versionDir, listTestDirPerm))
+
+	stderrReader, stderrWriter, err := os.Pipe()
+	require.NoError(t, err)
+
+	defer func() { _ = stderrReader.Close() }()
+
+	realStderr := os.Stderr
+	os.Stderr = stderrWriter
+
+	var stats vaultStats
+	stats.addVersion(&openFailFs{Fs: base, path: versionDir}, versionDir)
+
+	os.Stderr = realStderr
+
+	require.NoError(t, stderrWriter.Close())
+
+	warning, err := io.ReadAll(stderrReader)
+	require.NoError(t, err)
+
+	assert.Contains(t, string(warning), versionDir)
+	assert.Contains(t, string(warning), errOpenFailed.Error())
+	assert.False(t, stats.latestTime.IsZero(),
+		"the timestamp must still be tracked")
+}

internal/cli/info_test.go

@@ -0,0 +1,64 @@
+package cli_test
+
+import (
+	"bytes"
+	"crypto/rand"
+	"encoding/json"
+	"testing"
+
+	"github.com/awnumar/memguard"
+	"github.com/spf13/afero"
+	"github.com/spf13/cobra"
+	"github.com/stretchr/testify/require"
+	"sneak.berlin/go/secret/internal/cli"
+	"sneak.berlin/go/secret/internal/vault"
+)
+
+// TestInfoTotalSizeCountsSecretValues is a regression test for
+// https://git.eeqj.de/sneak/secret/issues/147, where the total size shown by
+// `secret info` left out every secret's value. Adding a secret must make it
+// grow by at least the size of the value.
+func TestInfoTotalSizeCountsSecretValues(t *testing.T) {
+	t.Parallel()
+
+	const valueSize = 10000
+
+	fs := afero.NewMemMapFs()
+
+	vlt, err := vault.CreateVault(fs, testStateDir, "default",
+		testMnemonicBuffer(t), nil)
+	require.NoError(t, err)
+
+	before := infoTotalSize(t, fs)
+
+	valueBytes := make([]byte, valueSize)
+	_, err = rand.Read(valueBytes)
+	require.NoError(t, err)
+
+	value := memguard.NewBufferFromBytes(valueBytes)
+	defer value.Destroy()
+
+	require.NoError(t, vlt.AddSecret("s1", value, false))
+
+	after := infoTotalSize(t, fs)
+	require.GreaterOrEqual(t, after-before, int64(valueSize))
+}
+
+// infoTotalSize returns the total size that `secret info --json` reports for
+// the state directory on fs.
+func infoTotalSize(t *testing.T, fs afero.Fs) int64 {
+	t.Helper()
+
+	var out bytes.Buffer
+
+	cmd := &cobra.Command{}
+	cmd.SetOut(&out)
+
+	err := cli.NewCLIInstanceWithStateDir(fs, testStateDir).Info(cmd, true)
+	require.NoError(t, err)
+
+	var info cli.InfoOutput
+	require.NoError(t, json.Unmarshal(out.Bytes(), &info))
+
+	return info.TotalSize
+}