90 lines
1.8 KiB
Go
90 lines
1.8 KiB
Go
package state
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import (
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"encoding/gob"
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"errors"
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"io/fs"
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"os"
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"os/exec"
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"path"
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"strconv"
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"git.ophivana.moe/cat/fortify/internal/system"
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)
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// we unfortunately have to assume there are never races between processes
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// this and launcher should eventually be replaced by a server process
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var (
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statePath string
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)
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type launcherState struct {
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PID int
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Launcher string
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Argv []string
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Command []string
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Capability Enablements
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}
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// SaveProcess called after process start, before wait
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func SaveProcess(uid string, cmd *exec.Cmd) error {
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statePath = path.Join(system.V.RunDir, uid, strconv.Itoa(cmd.Process.Pid))
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state := launcherState{
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PID: cmd.Process.Pid,
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Launcher: cmd.Path,
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Argv: cmd.Args,
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Command: command,
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Capability: *enablements,
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}
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if err := os.Mkdir(path.Join(system.V.RunDir, uid), 0700); err != nil && !errors.Is(err, fs.ErrExist) {
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return err
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}
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if f, err := os.OpenFile(statePath, os.O_RDWR|os.O_CREATE|os.O_EXCL, 0600); err != nil {
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return err
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} else {
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defer func() {
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if f.Close() != nil {
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// unreachable
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panic("state file closed prematurely")
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}
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}()
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return gob.NewEncoder(f).Encode(state)
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}
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}
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func readLaunchers(uid string) ([]*launcherState, error) {
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var f *os.File
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var r []*launcherState
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launcherPrefix := path.Join(system.V.RunDir, uid)
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if pl, err := os.ReadDir(launcherPrefix); err != nil {
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return nil, err
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} else {
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for _, e := range pl {
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if err = func() error {
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if f, err = os.Open(path.Join(launcherPrefix, e.Name())); err != nil {
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return err
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} else {
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defer func() {
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if f.Close() != nil {
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// unreachable
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panic("foreign state file closed prematurely")
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}
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}()
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var s launcherState
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r = append(r, &s)
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return gob.NewDecoder(f).Decode(&s)
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}
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}(); err != nil {
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return nil, err
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}
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}
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}
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return r, nil
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}
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