booster: Unable to unlock root partition with tpm2 key

Bisecting points me to c1b666775e9ac2bad4246078c8904c6a20976842

My assumption as tpm modules are built-in into the kernel in archlinux packages, booster doesn’t stand a chance to capture associated udev event as tpm devices initialized even before booster enters it’s main method. So we should check presence of /dev/tpmrm0 and don’t use waiters if tpm already here.

Something like that:

--- a/init/udev.go
+++ b/init/udev.go
@@ -2,6 +2,9 @@ package main
 
 import (
 	"fmt"
+	"github.com/google/go-tpm/legacy/tpm2"
+	"io"
+	"net"
 	"os"
 	"path/filepath"
 	"regexp"
@@ -73,8 +76,19 @@ var (
 )
 
 func udevListener() error {
-	// Initialize tpmReadyWg
-	tpmReadyWg.Add(1)
+	var dev io.ReadWriteCloser
+
+	if enableSwEmulator {
+		dev, _ = net.Dial("tcp", ":2321") // swtpm emulator is listening at port 2321
+	} else {
+		dev, _ = tpm2.OpenTPM("/dev/tpmrm0")
+	}
+	if dev != nil {
+		dev.Close()
+	} else {
+		// Initialize tpmReadyWg
+		tpmReadyWg.Add(1)
+	}
 
 	udevConn = new(netlink.UEventConn)
 	if err := udevConn.Connect(netlink.KernelEvent); err != nil {

It fixes no tpm devices found, but I still have no luck of unlocking partition…