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package state
import (
"encoding/gob"
"errors"
"flag"
"fmt"
"io/fs"
"os"
"os/exec"
"path"
"strconv"
"git.ophivana.moe/cat/fortify/internal/system"
)
// 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 Early() {
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)
}
// SaveProcess called after process start, before wait
func SaveProcess(uid string, cmd *exec.Cmd) error {
statePath = path.Join(system.V.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(system.V.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(system.V.RunDir, u.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
}
|
