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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
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'\n", toolPath)
}
cmd := exec.Command(toolPath, commandBuilder()...)
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() (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...)
// -- $@
args = append(args, "--")
args = append(args, a.command...)
return
}
func (a *App) commandBuilderMachineCtl() (args []string) {
args = make([]string, 0, 9+len(a.env))
// shell --uid=$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{}
innerCommand.WriteString("dbus-update-activation-environment --systemd")
for _, e := range a.env {
innerCommand.WriteString(" " + strings.SplitN(e, "=", 2)[0])
}
innerCommand.WriteString("; ")
if executable, err := os.Executable(); err != nil {
state.Fatal("Error reading executable path:", err)
} else {
if a.enablements.Has(state.EnableDBus) {
innerCommand.WriteString(dbusSessionBusAddress + "=" + "'" + dbusAddress + "' ")
}
innerCommand.WriteString("exec " + executable + " -V")
}
args = append(args, innerCommand.String())
return
}
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