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package app
import (
"encoding/gob"
"errors"
"fmt"
"io"
"io/fs"
"os"
"syscall"
"hakurei.app/container/check"
"hakurei.app/hst"
)
const pulseCookieSizeMax = 1 << 8
func init() { gob.Register(new(spPulseOp)) }
// spPulseOp exports the PulseAudio server to the container.
type spPulseOp struct {
// PulseAudio cookie data, populated during toSystem if a cookie is present.
Cookie *[pulseCookieSizeMax]byte
}
func (s *spPulseOp) toSystem(state *outcomeStateSys, _ *hst.Config) error {
pulseRuntimeDir, pulseSocket := s.commonPaths(state.outcomeState)
if _, err := state.k.stat(pulseRuntimeDir.String()); err != nil {
if !errors.Is(err, fs.ErrNotExist) {
return &hst.AppError{Step: fmt.Sprintf("access PulseAudio directory %q", pulseRuntimeDir), Err: err}
}
return newWithMessage(fmt.Sprintf("PulseAudio directory %q not found", pulseRuntimeDir))
}
if fi, err := state.k.stat(pulseSocket.String()); err != nil {
if !errors.Is(err, fs.ErrNotExist) {
return &hst.AppError{Step: fmt.Sprintf("access PulseAudio socket %q", pulseSocket), Err: err}
}
return newWithMessage(fmt.Sprintf("PulseAudio directory %q found but socket does not exist", pulseRuntimeDir))
} else {
if m := fi.Mode(); m&0o006 != 0o006 {
return newWithMessage(fmt.Sprintf("unexpected permissions on %q: %s", pulseSocket, m))
}
}
// hard link pulse socket into target-executable share
state.sys.Link(pulseSocket, state.runtime().Append("pulse"))
// publish current user's pulse cookie for target user
var paCookiePath *check.Absolute
{
const paLocateStep = "locate PulseAudio cookie"
// from environment
if p, ok := state.k.lookupEnv("PULSE_COOKIE"); ok {
if a, err := check.NewAbs(p); err != nil {
return &hst.AppError{Step: paLocateStep, Err: err}
} else {
// this takes precedence, do not verify whether the file is accessible
paCookiePath = a
goto out
}
}
// $HOME/.pulse-cookie
if p, ok := state.k.lookupEnv("HOME"); ok {
if a, err := check.NewAbs(p); err != nil {
return &hst.AppError{Step: paLocateStep, Err: err}
} else {
paCookiePath = a.Append(".pulse-cookie")
}
if fi, err := state.k.stat(paCookiePath.String()); err != nil {
paCookiePath = nil
if !errors.Is(err, fs.ErrNotExist) {
return &hst.AppError{Step: "access PulseAudio cookie", Err: err}
}
// fallthrough
} else if fi.IsDir() {
paCookiePath = nil
} else {
goto out
}
}
// $XDG_CONFIG_HOME/pulse/cookie
if p, ok := state.k.lookupEnv("XDG_CONFIG_HOME"); ok {
if a, err := check.NewAbs(p); err != nil {
return &hst.AppError{Step: paLocateStep, Err: err}
} else {
paCookiePath = a.Append("pulse", "cookie")
}
if fi, err := state.k.stat(paCookiePath.String()); err != nil {
paCookiePath = nil
if !errors.Is(err, fs.ErrNotExist) {
return &hst.AppError{Step: "access PulseAudio cookie", Err: err}
}
// fallthrough
} else if fi.IsDir() {
paCookiePath = nil
} else {
goto out
}
}
out:
}
if paCookiePath != nil {
if b, err := state.k.stat(paCookiePath.String()); err != nil {
return &hst.AppError{Step: "access PulseAudio cookie", Err: err}
} else {
if b.IsDir() {
return &hst.AppError{Step: "read PulseAudio cookie", Err: &os.PathError{Op: "stat", Path: paCookiePath.String(), Err: syscall.EISDIR}}
}
if b.Size() > pulseCookieSizeMax {
return newWithMessageError(
fmt.Sprintf("PulseAudio cookie at %q exceeds maximum expected size", paCookiePath),
&os.PathError{Op: "stat", Path: paCookiePath.String(), Err: syscall.ENOMEM},
)
}
}
var r io.ReadCloser
if f, err := state.k.open(paCookiePath.String()); err != nil {
return &hst.AppError{Step: "open PulseAudio cookie", Err: err}
} else {
r = f
}
s.Cookie = new([pulseCookieSizeMax]byte)
if n, err := r.Read(s.Cookie[:]); err != nil {
if !errors.Is(err, io.EOF) {
_ = r.Close()
return &hst.AppError{Step: "read PulseAudio cookie", Err: err}
}
state.msg.Verbosef("copied %d bytes from %q", n, paCookiePath)
}
if err := r.Close(); err != nil {
return &hst.AppError{Step: "close PulseAudio cookie", Err: err}
}
} else {
state.msg.Verbose("cannot locate PulseAudio cookie (tried " +
"$PULSE_COOKIE, " +
"$XDG_CONFIG_HOME/pulse/cookie, " +
"$HOME/.pulse-cookie)")
}
return nil
}
func (s *spPulseOp) toContainer(state *outcomeStateParams) error {
innerPulseSocket := state.runtimeDir.Append("pulse", "native")
state.params.Bind(state.runtimePath().Append("pulse"), innerPulseSocket, 0)
state.env["PULSE_SERVER"] = "unix:" + innerPulseSocket.String()
if s.Cookie != nil {
innerDst := hst.AbsTmp.Append("/pulse-cookie")
state.env["PULSE_COOKIE"] = innerDst.String()
state.params.Place(innerDst, s.Cookie[:])
}
return nil
}
func (s *spPulseOp) commonPaths(state *outcomeState) (pulseRuntimeDir, pulseSocket *check.Absolute) {
// PulseAudio runtime directory (usually `/run/user/%d/pulse`)
pulseRuntimeDir = state.sc.RuntimePath.Append("pulse")
// PulseAudio socket (usually `/run/user/%d/pulse/native`)
pulseSocket = pulseRuntimeDir.Append("native")
return
}
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