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package app
import (
"errors"
"fmt"
"os"
"os/user"
"path"
"strconv"
"git.ophivana.moe/cat/fortify/internal/state"
"git.ophivana.moe/cat/fortify/internal/util"
"git.ophivana.moe/cat/fortify/internal/verbose"
)
const (
xdgRuntimeDir = "XDG_RUNTIME_DIR"
)
type App struct {
uid int // assigned
env []string // modified via AppendEnv
command []string // set on initialisation
launchOptionText string // set on initialisation
launchOption uint8 // assigned
sharePath string // set on initialisation
runtimePath string // assigned
runDirPath string // assigned
toolPath string // assigned
enablements state.Enablements // set via setEnablement
*user.User // assigned
// absolutely *no* method of this type is thread-safe
// so don't treat it as if it is
}
func (a *App) LaunchOption() uint8 {
return a.launchOption
}
func (a *App) RunDir() string {
return a.runDirPath
}
func (a *App) setEnablement(e state.Enablement) {
if a.enablements.Has(e) {
panic("enablement " + e.String() + " set twice")
}
a.enablements |= e.Mask()
}
func New(userName string, args []string, launchOptionText string) *App {
a := &App{
command: args,
launchOptionText: launchOptionText,
sharePath: path.Join(os.TempDir(), "fortify."+strconv.Itoa(os.Geteuid())),
}
// runtimePath, runDirPath
if r, ok := os.LookupEnv(xdgRuntimeDir); !ok {
fmt.Println("Env variable", xdgRuntimeDir, "unset")
// too early for fatal
os.Exit(1)
} else {
a.runtimePath = r
a.runDirPath = path.Join(a.runtimePath, "fortify")
verbose.Println("Runtime directory at", a.runDirPath)
}
// *user.User
if u, err := user.Lookup(userName); err != nil {
if errors.As(err, new(user.UnknownUserError)) {
fmt.Println("unknown user", userName)
} else {
// unreachable
panic(err)
}
// too early for fatal
os.Exit(1)
} else {
a.User = u
}
// uid
if u, err := strconv.Atoi(a.Uid); err != nil {
// usually unreachable
panic("uid parse")
} else {
a.uid = u
}
verbose.Println("Running as user", a.Username, "("+a.Uid+"),", "command:", a.command)
if util.SdBootedV {
verbose.Println("System booted with systemd as init system (PID 1).")
}
// launchOption, toolPath
switch a.launchOptionText {
case "sudo":
a.launchOption = LaunchMethodSudo
if sudoPath, ok := util.Which("sudo"); !ok {
fmt.Println("Did not find 'sudo' in PATH")
os.Exit(1)
} else {
a.toolPath = sudoPath
}
case "bubblewrap":
a.launchOption = LaunchMethodBwrap
if bwrapPath, ok := util.Which("bwrap"); !ok {
fmt.Println("Did not find 'bwrap' in PATH")
os.Exit(1)
} else {
a.toolPath = bwrapPath
}
case "systemd":
a.launchOption = LaunchMethodMachineCtl
if !util.SdBootedV {
fmt.Println("System has not been booted with systemd as init system (PID 1).")
os.Exit(1)
}
if machineCtlPath, ok := util.Which("machinectl"); !ok {
fmt.Println("Did not find 'machinectl' in PATH")
} else {
a.toolPath = machineCtlPath
}
default:
fmt.Println("invalid launch method")
os.Exit(1)
}
verbose.Println("Determined launch method to be", a.launchOptionText, "with tool at", a.toolPath)
return a
}
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