Make runqemu to work when rm_work is enabled

index 8d27c4d..27d5315 100644
@@ -19,3 +19,7 @@ do_install() {
 	install -d ${D}${bindir}
 	install tunctl ${D}${bindir}/
 }
+
+RM_WORK_EXCLUDE_ITEMS += "recipe-sysroot-native"
+DEPENDS += "qemu-native"
+addtask addto_recipe_sysroot after do_populate_sysroot before do_build

index 5b5d56b..a8bb9eb 100755
@@ -1056,7 +1056,18 @@ class BaseConfig(object):
         if not qemu_system:
             raise Exception("Failed to boot, QB_SYSTEM_NAME is NULL!")
 
-        qemu_bin = '%s/%s' % (self.get('STAGING_BINDIR_NATIVE'), qemu_system)
+        cmd = 'bitbake qemu-helper-native -e'
+        logger.info('Running %s...' % cmd)
+        out = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE)
+        out = out.stdout.read().decode('utf-8')
+
+        match = re.search('^STAGING_BINDIR_NATIVE="(.*)"', out, re.M)
+        if match:
+            bindir_native  = match.group(1)
+        else:
+            raise Exception("Can't find STAGING_BINDIR_NATIVE in '%s' output" % cmd)
+
+        qemu_bin = '%s/%s' % (bindir_native, qemu_system)
 
         # It is possible to have qemu-native in ASSUME_PROVIDED, and it won't
         # find QEMU in sysroot, it needs to use host's qemu.

index a8bb9eb..6cdedd8 100755
@@ -721,7 +721,7 @@ class BaseConfig(object):
                 self.load_bitbake_env()
 
             if self.bitbake_e:
-                native_vars = ['STAGING_DIR_NATIVE', 'STAGING_BINDIR_NATIVE']
+                native_vars = ['STAGING_DIR_NATIVE']
                 for nv in native_vars:
                     s = re.search('^%s="(.*)"' % nv, self.bitbake_e, re.M)
                     if s and s.group(1) != self.get(nv):

@@ -1056,18 +1056,7 @@ class BaseConfig(object):
         if not qemu_system:
             raise Exception("Failed to boot, QB_SYSTEM_NAME is NULL!")
 
-        cmd = 'bitbake qemu-helper-native -e'
-        logger.info('Running %s...' % cmd)
-        out = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE)
-        out = out.stdout.read().decode('utf-8')
-
-        match = re.search('^STAGING_BINDIR_NATIVE="(.*)"', out, re.M)
-        if match:
-            bindir_native  = match.group(1)
-        else:
-            raise Exception("Can't find STAGING_BINDIR_NATIVE in '%s' output" % cmd)
-
-        qemu_bin = '%s/%s' % (bindir_native, qemu_system)
+        qemu_bin = '%s/%s' % (self.bindir_native, qemu_system)
 
         # It is possible to have qemu-native in ASSUME_PROVIDED, and it won't
         # find QEMU in sysroot, it needs to use host's qemu.

@@ -1196,6 +1185,28 @@ class BaseConfig(object):
             self.bitbake_e = ''
             logger.warn("Couldn't run 'bitbake -e' to gather environment information:\n%s" % err.output.decode('utf-8'))
 
+    @property
+    def bindir_native(self):
+        result = self.get('STAGING_BINDIR_NATIVE')
+        if result and os.path.exists(result):
+            return result
+
+        cmd = 'bitbake qemu-helper-native -e'
+        logger.info('Running %s...' % cmd)
+        out = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE)
+        out = out.stdout.read().decode('utf-8')
+
+        match = re.search('^STAGING_BINDIR_NATIVE="(.*)"', out, re.M)
+        if match:
+            result = match.group(1)
+            if os.path.exists(result):
+                self.set('STAGING_BINDIR_NATIVE', result)
+                return result
+            raise Exception("Native sysroot directory %s doesn't exist" % result)
+        else:
+            raise Exception("Can't find STAGING_BINDIR_NATIVE in '%s' output" % cmd)
+
+
 def main():
     if "help" in sys.argv or '-h' in sys.argv or '--help' in sys.argv:
         print_usage()

index 6cdedd8..3744c67 100755
@@ -920,7 +920,7 @@ class BaseConfig(object):
             gid = os.getgid()
             uid = os.getuid()
             logger.info("Setting up tap interface under sudo")
-            cmd = 'sudo %s %s %s %s' % (self.qemuifup, uid, gid, self.get('STAGING_DIR_NATIVE'))
+            cmd = 'sudo %s %s %s %s' % (self.qemuifup, uid, gid, self.bindir_native)
             tap = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE).stdout.read().decode('utf-8').rstrip('\n')
             lockfile = os.path.join(lockdir, tap)
             self.lock = lockfile + '.lock'

@@ -1140,7 +1140,7 @@ class BaseConfig(object):
 
     def cleanup(self):
         if self.cleantap:
-            cmd = 'sudo %s %s %s' % (self.qemuifdown, self.tap, self.get('STAGING_DIR_NATIVE'))
+            cmd = 'sudo %s %s %s' % (self.qemuifdown, self.tap, self.bindir_native)
             logger.info('Running %s' % cmd)
             subprocess.call(cmd, shell=True)
         if self.lock_descriptor:

index 8f66cfa2..ffbc9de 100755
@@ -41,11 +41,11 @@ if [ $# -ne 2 ]; then
 fi
 
 TAP=$1
-NATIVE_SYSROOT_DIR=$2
+STAGING_BINDIR_NATIVE=$2
 
-TUNCTL=$NATIVE_SYSROOT_DIR/usr/bin/tunctl
+TUNCTL=$STAGING_BINDIR_NATIVE/tunctl
 if [ ! -e "$TUNCTL" ]; then
-	echo "Error: Unable to find tunctl binary in '$NATIVE_SYSROOT_DIR/usr/bin', please bitbake qemu-helper-native"
+	echo "Error: Unable to find tunctl binary in '$STAGING_BINDIR_NATIVE', please bitbake qemu-helper-native"
 	exit 1
 fi
 

index d9bd894..59a15ea 100755
@@ -49,11 +49,11 @@ fi
 
 USERID="-u $1"
 GROUP="-g $2"
-NATIVE_SYSROOT_DIR=$3
+STAGING_BINDIR_NATIVE=$3
 
-TUNCTL=$NATIVE_SYSROOT_DIR/usr/bin/tunctl
+TUNCTL=$STAGING_BINDIR_NATIVE/tunctl
 if [ ! -x "$TUNCTL" ]; then
-       echo "Error: Unable to find tunctl binary in '$NATIVE_SYSROOT_DIR/usr/bin', please bitbake qemu-helper-native"
+       echo "Error: Unable to find tunctl binary in '$STAGING_BINDIR_NATIVE', please bitbake qemu-helper-native"
 	exit 1
 fi
 

index 2870388..cc5314e 100644
@@ -87,7 +87,14 @@ python do_write_qemuboot_conf() {
     cf = configparser.ConfigParser()
     cf.add_section('config_bsp')
     for k in qemuboot_vars(d):
-        cf.set('config_bsp', k, '%s' % d.getVar(k))
+        # qemu-helper-native sysroot is not removed by rm_work and
+        # contains all tools required by runqemu
+        if k == 'STAGING_BINDIR_NATIVE':
+            val = os.path.join(d.getVar('BASE_WORKDIR'), d.getVar('BUILD_SYS'),
+                               'qemu-helper-native/1.0-r1/recipe-sysroot-native/usr/bin/')
+        else:
+            val = d.getVar(k)
+        cf.set('config_bsp', k, '%s' % val)
 
     # QB_DEFAULT_KERNEL's value of KERNEL_IMAGETYPE is the name of a symlink
     # to the kernel file, which hinders relocatability of the qb conf.