core: add privesc package for privilege escalation

- Adds support for run0 and doas
fixes #998

core/internal/tui/views_privesc.go

@@ -0,0 +1,133 @@
+package tui
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/AvengeMedia/DankMaterialShell/core/internal/privesc"
+	tea "github.com/charmbracelet/bubbletea"
+)
+
+func (m Model) viewSelectPrivesc() string {
+	var b strings.Builder
+
+	b.WriteString(m.renderBanner())
+	b.WriteString("\n")
+	b.WriteString(m.styles.Title.Render("Privilege Escalation Tool"))
+	b.WriteString("\n\n")
+	b.WriteString(m.styles.Normal.Render("Multiple privilege tools are available. Choose one for installation:"))
+	b.WriteString("\n\n")
+
+	for i, t := range m.availablePrivesc {
+		label := fmt.Sprintf("%s  —  %s", t.Name(), privescToolDescription(t))
+		switch i {
+		case m.selectedPrivesc:
+			b.WriteString(m.styles.SelectedOption.Render("▶ " + label))
+		default:
+			b.WriteString(m.styles.Normal.Render("  " + label))
+		}
+		b.WriteString("\n")
+	}
+
+	b.WriteString("\n")
+	b.WriteString(m.styles.Subtle.Render(fmt.Sprintf("Set %s=<tool> to skip this prompt in future runs.", privesc.EnvVar)))
+	b.WriteString("\n\n")
+	b.WriteString(m.styles.Subtle.Render("↑/↓: Navigate, Enter: Select, Esc: Back"))
+	return b.String()
+}
+
+func (m Model) updateSelectPrivescState(msg tea.Msg) (tea.Model, tea.Cmd) {
+	keyMsg, ok := msg.(tea.KeyMsg)
+	if !ok {
+		return m, m.listenForLogs()
+	}
+
+	switch keyMsg.String() {
+	case "up":
+		if m.selectedPrivesc > 0 {
+			m.selectedPrivesc--
+		}
+	case "down":
+		if m.selectedPrivesc < len(m.availablePrivesc)-1 {
+			m.selectedPrivesc++
+		}
+	case "enter":
+		chosen := m.availablePrivesc[m.selectedPrivesc]
+		if err := privesc.SetTool(chosen); err != nil {
+			m.err = fmt.Errorf("failed to select %s: %w", chosen.Name(), err)
+			m.state = StateError
+			return m, nil
+		}
+		return m.routeToAuthAfterPrivesc()
+	case "esc":
+		m.state = StateDependencyReview
+		return m, nil
+	}
+	return m, nil
+}
+
+func privescToolDescription(t privesc.Tool) string {
+	switch t {
+	case privesc.ToolSudo:
+		return "classic sudo (supports password prompt in this installer)"
+	case privesc.ToolDoas:
+		return "OpenBSD-style doas (requires persist or nopass in /etc/doas.conf)"
+	case privesc.ToolRun0:
+		return "systemd run0 (authenticated via polkit)"
+	default:
+		return string(t)
+	}
+}
+
+// routeToAuthAfterPrivesc advances from the privesc-selection screen to the
+// right auth flow. Sudo goes through the fingerprint/password path; doas and
+// run0 skip password entry and proceed to install.
+func (m Model) routeToAuthAfterPrivesc() (tea.Model, tea.Cmd) {
+	tool, err := privesc.Detect()
+	if err != nil {
+		m.err = err
+		m.state = StateError
+		return m, nil
+	}
+
+	if tool == privesc.ToolSudo {
+		if checkFingerprintEnabled() {
+			m.state = StateAuthMethodChoice
+			m.selectedConfig = 0
+			return m, nil
+		}
+		m.state = StatePasswordPrompt
+		m.passwordInput.Focus()
+		return m, nil
+	}
+
+	m.sudoPassword = ""
+	m.packageProgress = packageInstallProgressMsg{}
+	m.state = StateInstallingPackages
+	m.isLoading = true
+	return m, tea.Batch(m.spinner.Tick, m.installPackages())
+}
+
+// enterAuthPhase is called when dependency review (or the Gentoo screens)
+// finish. It either routes directly to the sudo/fingerprint flow or shows
+// the privesc-tool selection screen when multiple tools are available and
+// no $DMS_PRIVESC override is set.
+func (m Model) enterAuthPhase() (tea.Model, tea.Cmd) {
+	tools := privesc.AvailableTools()
+	_, envSet := privesc.EnvOverride()
+
+	if len(tools) == 0 {
+		m.err = fmt.Errorf("no supported privilege tool (sudo/doas/run0) found on PATH")
+		m.state = StateError
+		return m, nil
+	}
+
+	if envSet || len(tools) == 1 {
+		return m.routeToAuthAfterPrivesc()
+	}
+
+	m.availablePrivesc = tools
+	m.selectedPrivesc = 0
+	m.state = StateSelectPrivesc
+	return m, nil
+}