feat(config): add automatic backup before modifying config file (#7)

internal/adapters/data/file/ssh_config_manager.go

@@ -16,6 +16,7 @@ package file
 
 import (
 	"fmt"
+	"io"
 	"os"
 	"path/filepath"
 
@@ -56,16 +57,41 @@ func (m *sshConfigManager) writeServers(servers []domain.Server) error {
 		return err
 	}
 
-	file, err := os.Create(m.filePath)
+	if err := m.backupCurrentConfig(); err != nil {
+		return err
+	}
+
+	dir := filepath.Dir(m.filePath)
+	tmp, err := os.CreateTemp(dir, ".lazyssh-tmp-*")
 	if err != nil {
 		return err
 	}
-	defer func() {
-		_ = file.Close()
-	}()
+	defer func() { _ = os.Remove(tmp.Name()) }()
+
+	if err := os.Chmod(tmp.Name(), 0o600); err != nil {
+		_ = tmp.Close()
+		return err
+	}
 
 	writer := &SSHConfigWriter{}
-	return writer.Write(file, servers)
+	if err := writer.Write(tmp, servers); err != nil {
+		_ = tmp.Close()
+		return err
+	}
+
+	if err := tmp.Sync(); err != nil {
+		_ = tmp.Close()
+		return err
+	}
+	if err := tmp.Close(); err != nil { // close after sync to ensure contents are persisted
+		return err
+	}
+
+	if err := os.Rename(tmp.Name(), m.filePath); err != nil {
+		return err
+	}
+
+	return nil
 }
 
 func (m *sshConfigManager) addServer(server domain.Server) error {
@@ -135,3 +161,49 @@ func (m *sshConfigManager) ensureDirectory() error {
 	dir := filepath.Dir(m.filePath)
 	return os.MkdirAll(dir, 0o700)
 }
+
+// backupCurrentConfig creates ~/.lazyssh/backups/config.backup with 0600 perms,
+// overwriting it each time, but only if the source config exists.
+func (m *sshConfigManager) backupCurrentConfig() error {
+	// If source config does not exist, skip backup
+	if _, err := os.Stat(m.filePath); err != nil {
+		if os.IsNotExist(err) {
+			return nil
+		}
+		return err
+	}
+
+	home, err := os.UserHomeDir()
+	if err != nil {
+		return err
+	}
+	backupDir := filepath.Join(home, ".lazyssh", "backups")
+	// Ensure directory with 0700
+	if err := os.MkdirAll(backupDir, 0o700); err != nil {
+		return err
+	}
+	backupPath := filepath.Join(backupDir, "config.backup")
+	// Copy file contents
+	src, err := os.Open(m.filePath)
+	if err != nil {
+		return err
+	}
+	defer func() { _ = src.Close() }()
+
+	// #nosec G304 -- backupPath is generated internally and trusted
+	dst, err := os.OpenFile(backupPath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0o600)
+	if err != nil {
+		return err
+	}
+
+	defer func() { _ = dst.Close() }()
+
+	if _, err := io.Copy(dst, src); err != nil {
+		return err
+	}
+
+	if err := dst.Sync(); err != nil {
+		return err
+	}
+	return nil
+}

internal/adapters/ui/header.go

@@ -25,17 +25,15 @@ import (
 type AppHeader struct {
 	*tview.Flex
 	version   string
-	buildTime string
 	gitCommit string
 	repoURL   string
 }
 
-func NewAppHeader(version, gitCommit, buildTime, repoURL string) *AppHeader {
+func NewAppHeader(version, gitCommit, repoURL string) *AppHeader {
 	header := &AppHeader{
 		Flex:      tview.NewFlex(),
 		version:   version,
 		repoURL:   repoURL,
-		buildTime: buildTime,
 		gitCommit: gitCommit,
 	}
 	header.build()
@@ -85,13 +83,11 @@ func (h *AppHeader) buildCenterSection(bg tcell.Color) *tview.TextView {
 	if commit != "" {
 		commitTag = makeTag(commit, "#A78BFA") // violet
 	}
-	timeTag := makeTag(formatBuildTime(h.buildTime), "#3B82F6") // blue
 
 	text := versionTag
 	if commitTag != "" {
 		text += "  " + commitTag
 	}
-	text += "  " + timeTag
 
 	center.SetText(text)
 	return center
@@ -126,30 +122,6 @@ func shortCommit(c string) string {
 	return c
 }
 
-// formatBuildTime tries to parse common time formats and returns a concise human-readable string.
-func formatBuildTime(s string) string {
-	s = strings.TrimSpace(s)
-	if s == "" {
-		return "unknown"
-	}
-	layouts := []string{
-		"2006-01-02 15:04:05",
-		time.RFC3339,
-		time.RFC1123,
-		time.RFC1123Z,
-	}
-	var t time.Time
-	var err error
-	for _, l := range layouts {
-		t, err = time.Parse(l, s)
-		if err == nil {
-			return t.Format("Mon, 02 Jan 2006 15:04")
-		}
-	}
-
-	return s
-}
-
 // makeTag returns a rectangular-looking colored chip for the given text.
 func makeTag(text, bg string) string {
 	text = strings.TrimSpace(text)

internal/adapters/ui/tui.go

@@ -27,9 +27,8 @@ import (
 type tui struct {
 	logger *zap.SugaredLogger
 
-	version   string
-	commit    string
-	buildDate string
+	version string
+	commit  string
 
 	app           *tview.Application
 	serverService ports.ServerService
@@ -49,14 +48,13 @@ type tui struct {
 	searchVisible bool
 }
 
-func NewTUI(logger *zap.SugaredLogger, ss ports.ServerService, version, commit, buildDate string) *tui {
+func NewTUI(logger *zap.SugaredLogger, ss ports.ServerService, version, commit string) *tui {
 	return &tui{
 		logger:        logger,
 		app:           tview.NewApplication(),
 		serverService: ss,
 		version:       version,
 		commit:        commit,
-		buildDate:     buildDate,
 	}
 }
 
@@ -68,7 +66,7 @@ func (t *tui) Run() error {
 	}()
 	t.app.EnableMouse(true)
 	t.initializeTheme().buildComponents().buildLayout().bindEvents().loadInitialData().loadSplashScreen()
-	t.logger.Infow("starting TUI application", "version", t.version, "commit", t.commit, "buildDate", t.buildDate)
+	t.logger.Infow("starting TUI application", "version", t.version, "commit", t.commit)
 	if err := t.app.Run(); err != nil {
 		t.logger.Errorw("application run error", "error", err)
 		return err
@@ -89,7 +87,7 @@ func (t *tui) initializeTheme() *tui {
 }
 
 func (t *tui) buildComponents() *tui {
-	t.header = NewAppHeader(t.version, t.commit, t.buildDate, RepoURL)
+	t.header = NewAppHeader(t.version, t.commit, RepoURL)
 	t.searchBar = NewSearchBar().
 		OnSearch(t.handleSearchInput).
 		OnEscape(t.hideSearchBar)