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|
package main
import (
"encoding/gob"
"errors"
"flag"
"fmt"
"io/fs"
"os"
"os/exec"
"path"
"strconv"
)
// we unfortunately have to assume there are never races between processes
// this and launcher should eventually be replaced by a server process
var (
stateActionEarly bool
statePath string
cleanupCandidate []string
xcbActionComplete bool
)
type launcherState struct {
PID int
Launcher string
Argv []string
Command []string
}
func init() {
flag.BoolVar(&stateActionEarly, "state", false, "query state value of current active launchers")
}
func tryState() {
if !stateActionEarly {
return
}
launchers, err := readLaunchers()
if err != nil {
fmt.Println("Error reading launchers:", err)
os.Exit(1)
}
fmt.Println("\tPID\tLauncher")
for _, state := range launchers {
fmt.Printf("\t%d\t%s\nCommand: %s\nArgv: %s\n", state.PID, state.Launcher, state.Command, state.Argv)
}
os.Exit(0)
}
func registerRevertPath(p string) {
cleanupCandidate = append(cleanupCandidate, p)
}
// called after process start, before wait
func registerProcess(uid string, cmd *exec.Cmd) error {
statePath = path.Join(runDir, uid, strconv.Itoa(cmd.Process.Pid))
state := launcherState{
PID: cmd.Process.Pid,
Launcher: cmd.Path,
Argv: cmd.Args,
Command: command,
}
if err := os.Mkdir(path.Join(runDir, uid), 0700); err != nil && !errors.Is(err, fs.ErrExist) {
return err
}
if f, err := os.OpenFile(statePath, os.O_RDWR|os.O_CREATE|os.O_EXCL, 0600); err != nil {
return err
} else {
defer func() {
if f.Close() != nil {
// unreachable
panic("state file closed prematurely")
}
}()
return gob.NewEncoder(f).Encode(state)
}
}
func readLaunchers() ([]*launcherState, error) {
var f *os.File
var r []*launcherState
launcherPrefix := path.Join(runDir, ego.Uid)
if pl, err := os.ReadDir(launcherPrefix); err != nil {
return nil, err
} else {
for _, e := range pl {
if err = func() error {
if f, err = os.Open(path.Join(launcherPrefix, e.Name())); err != nil {
return err
} else {
defer func() {
if f.Close() != nil {
// unreachable
panic("foreign state file closed prematurely")
}
}()
var s launcherState
r = append(r, &s)
return gob.NewDecoder(f).Decode(&s)
}
}(); err != nil {
return nil, err
}
}
}
return r, nil
}
func beforeExit() {
if err := os.Remove(statePath); err != nil && !errors.Is(err, fs.ErrNotExist) {
fmt.Println("Error removing state file:", err)
}
if a, err := readLaunchers(); err != nil {
fmt.Println("Error reading active launchers:", err)
os.Exit(1)
} else if len(a) > 0 {
// other launchers are still active
if verbose {
fmt.Printf("Found %d active launchers, exiting without cleaning up\n", len(a))
}
return
}
if verbose {
fmt.Println("No other launchers active, will clean up")
}
if xcbActionComplete {
if verbose {
fmt.Printf("X11: Removing XHost entry SI:localuser:%s\n", ego.Username)
}
if err := changeHosts(xcbHostModeDelete, xcbFamilyServerInterpreted, "localuser\x00"+ego.Username); err != nil {
fmt.Println("Error removing XHost entry:", err)
}
}
for _, candidate := range cleanupCandidate {
if err := aclUpdatePerm(candidate, uid); err != nil {
fmt.Printf("Error stripping ACL entry from '%s': %s\n", candidate, err)
}
if verbose {
fmt.Printf("Stripped ACL entry for user '%s' from '%s'\n", ego.Username, candidate)
}
}
}
func fatal(msg ...any) {
fmt.Println(msg...)
beforeExit()
os.Exit(1)
}
|
