1 files changed, 178 insertions, 0 deletions
diff --git a/internal/app/run.go b/internal/app/run.go
new file mode 100644
index 00000000..bd3bd9bf
--- /dev/null
+++ b/internal/app/run.go
@@ -0,0 +1,178 @@
+package app
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"os/exec"
+	"strings"
+
+	"git.ophivana.moe/cat/fortify/internal/state"
+	"git.ophivana.moe/cat/fortify/internal/system"
+	"git.ophivana.moe/cat/fortify/internal/util"
+)
+
+const (
+	term        = "TERM"
+	sudoAskPass = "SUDO_ASKPASS"
+)
+const (
+	LaunchMethodSudo = iota
+	LaunchMethodMachineCtl
+
+	LaunchBare
+	launchOptionLength
+)
+
+var (
+	// LaunchOptions is set in main's cli.go
+	LaunchOptions [launchOptionLength]bool
+)
+
+func (a *App) Run() {
+	// pass $TERM to launcher
+	if t, ok := os.LookupEnv(term); ok {
+		a.AppendEnv(term, t)
+	}
+
+	commandBuilder := a.commandBuilderSudo
+
+	var toolPath string
+
+	// dependency checks
+	const sudoFallback = "Falling back to 'sudo', some desktop integration features may not work"
+	if LaunchOptions[LaunchMethodMachineCtl] && !LaunchOptions[LaunchMethodSudo] { // sudo argument takes priority
+		if !util.SdBooted() {
+			fmt.Println("This system was not booted through systemd")
+			fmt.Println(sudoFallback)
+		} else if machineCtlPath, ok := util.Which("machinectl"); !ok {
+			fmt.Println("Did not find 'machinectl' in PATH")
+			fmt.Println(sudoFallback)
+		} else {
+			toolPath = machineCtlPath
+			commandBuilder = a.commandBuilderMachineCtl
+		}
+	} else if sudoPath, ok := util.Which("sudo"); !ok {
+		state.Fatal("Did not find 'sudo' in PATH")
+	} else {
+		toolPath = sudoPath
+	}
+
+	if system.V.Verbose {
+		fmt.Printf("Selected launcher '%s' bare=%t\n", toolPath, LaunchOptions[LaunchBare])
+	}
+
+	cmd := exec.Command(toolPath, commandBuilder(LaunchOptions[LaunchBare])...)
+	cmd.Env = a.env
+	cmd.Stdin = os.Stdin
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	cmd.Dir = system.V.RunDir
+
+	if system.V.Verbose {
+		fmt.Println("Executing:", cmd)
+	}
+
+	if err := cmd.Start(); err != nil {
+		state.Fatal("Error starting process:", err)
+	}
+
+	state.RegisterEnablement(a.enablements)
+
+	if err := state.SaveProcess(a.Uid, cmd); err != nil {
+		// process already started, shouldn't be fatal
+		fmt.Println("Error registering process:", err)
+	}
+
+	var r int
+	if err := cmd.Wait(); err != nil {
+		var exitError *exec.ExitError
+		if !errors.As(err, &exitError) {
+			state.Fatal("Error running process:", err)
+		}
+	}
+
+	if system.V.Verbose {
+		fmt.Println("Process exited with exit code", r)
+	}
+	state.BeforeExit()
+	os.Exit(r)
+}
+
+func (a *App) commandBuilderSudo(bare bool) (args []string) {
+	args = make([]string, 0, 4+len(a.env)+len(a.command))
+
+	// -Hiu $USER
+	args = append(args, "-Hiu", a.Username)
+
+	// -A?
+	if _, ok := os.LookupEnv(sudoAskPass); ok {
+		if system.V.Verbose {
+			fmt.Printf("%s set, adding askpass flag\n", sudoAskPass)
+		}
+		args = append(args, "-A")
+	}
+
+	// environ
+	args = append(args, a.env...)
+
+	// -- $@
+	args = append(args, "--")
+	args = append(args, a.command...)
+
+	return
+}
+
+func (a *App) commandBuilderMachineCtl(bare bool) (args []string) {
+	args = make([]string, 0, 9+len(a.env))
+
+	// shell --uid=$USER
+	args = append(args, "shell", "--uid="+a.Username)
+
+	// --quiet
+	if !system.V.Verbose {
+		args = append(args, "--quiet")
+	}
+
+	// environ
+	envQ := make([]string, len(a.env)+1)
+	for i, e := range a.env {
+		envQ[i] = "-E" + e
+	}
+	envQ[len(a.env)] = "-E" + a.launcherPayloadEnv()
+	args = append(args, envQ...)
+
+	// -- .host
+	args = append(args, "--", ".host")
+
+	// /bin/sh -c
+	if sh, ok := util.Which("sh"); !ok {
+		state.Fatal("Did not find 'sh' in PATH")
+	} else {
+		args = append(args, sh, "-c")
+	}
+
+	if len(a.command) == 0 { // execute shell if command is not provided
+		a.command = []string{"$SHELL"}
+	}
+
+	innerCommand := strings.Builder{}
+
+	if !bare {
+		innerCommand.WriteString("dbus-update-activation-environment --systemd")
+		for _, e := range a.env {
+			innerCommand.WriteString(" " + strings.SplitN(e, "=", 2)[0])
+		}
+		innerCommand.WriteString("; ")
+		//innerCommand.WriteString("systemctl --user start xdg-desktop-portal-gtk; ")
+	}
+
+	if executable, err := os.Executable(); err != nil {
+		state.Fatal("Error reading executable path:", err)
+	} else {
+		innerCommand.WriteString("exec " + executable + " -V")
+	}
+	args = append(args, innerCommand.String())
+
+	return
+}