shim: get rid of insane launch condition

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

internal/app/launch.machinectl.go

@@ -57,8 +57,8 @@ func (a *app) commandBuilderMachineCtl(shimEnv string) (args []string) {
 		}
 	}
 
-	// both license and version flags need to be set to activate shim path
-	innerCommand.WriteString("exec " + a.seal.sys.executable + " -V -license")
+	// launch fortify as shim
+	innerCommand.WriteString("exec " + a.seal.sys.executable + " shim")
 
 	// append inner command
 	args = append(args, innerCommand.String())

internal/app/launch.sudo.go

@@ -26,7 +26,7 @@ func (a *app) commandBuilderSudo(shimEnv string) (args []string) {
 	args = append(args, shimEnv)
 
 	// -- $@
-	args = append(args, "--", a.seal.sys.executable, "-V", "--license") // magic for shim.Try()
+	args = append(args, "--", a.seal.sys.executable, "shim")
 
 	return
 }

internal/shim/main.go

@@ -3,6 +3,7 @@ package shim
 import (
 	"encoding/gob"
 	"errors"
+	"flag"
 	"fmt"
 	"net"
 	"os"
@@ -148,3 +149,13 @@ func receiveWLfd(conn *net.UnixConn) (int, error) {
 		return fds[0], nil
 	}
 }
+
+// Try runs shim and stops execution if FORTIFY_SHIM is set.
+func Try() {
+	if args := flag.Args(); len(args) == 1 && args[0] == "shim" {
+		if s, ok := os.LookupEnv(EnvShim); ok {
+			shim(s)
+			panic("unreachable")
+		}
+	}
+}

internal/shim/parent.go

@@ -80,11 +80,3 @@ func ServeConfig(socket string, payload *Payload, wl string, done chan struct{})
 		return ws, nil
 	}
 }
-
-// Try runs shim and stops execution if FORTIFY_SHIM is set.
-func Try() {
-	if s, ok := os.LookupEnv(EnvShim); ok {
-		shim(s)
-	}
-	panic("unreachable")
-}

main.go

@@ -35,10 +35,8 @@ func main() {
 		verbose.Println("system booted with systemd as init system")
 	}
 
-	// launcher payload early exit
-	if printVersion && printLicense {
-		shim.Try()
-	}
+	// shim early exit
+	shim.Try()
 
 	// version/license/template command early exit
 	tryVersion()