cmd/fshim: switch to setup pipe

The socket-based approach is no longer necessary as fsu allows extra files and sudo compatibility is no longer relevant.

Signed-off-by: Ophestra Umiker <cat@ophivana.moe>

cmd/fshim/ipc/payload.go

@@ -1,11 +1,7 @@
 package shim0
 
 import (
-	"encoding/gob"
-	"net"
-
 	"git.ophivana.moe/security/fortify/helper/bwrap"
-	"git.ophivana.moe/security/fortify/internal/fmsg"
 )
 
 const Env = "FORTIFY_SHIM"
@@ -23,13 +19,3 @@ type Payload struct {
 	// verbosity pass through
 	Verbose bool
 }
-
-func (p *Payload) Serve(conn *net.UnixConn) error {
-	if err := gob.NewEncoder(conn).Encode(*p); err != nil {
-		return fmsg.WrapErrorSuffix(err,
-			"cannot stream shim payload:")
-	}
-
-	return fmsg.WrapErrorSuffix(conn.Close(),
-		"cannot close setup connection:")
-}