libvirt: fix python3 compatibility in hook_support.py

By default Popen expects all the streams to be bytes-like objects but,
in the Popen.communicate() function call, the "input" argument is a
string, making the call fail with the error:

qemu hook error: a bytes-like object is required, not 'str'

Fix the error by setting text mode to True in the subprocess creation.

Also fix the "SyntaxWarning: invalid escape sequence '\w'" in the regex
used to match script names.

Signed-off-by: Massimiliano Minella <massimiliano.minella@se.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/recipes-extended/libvirt/libvirt/hook_support.py b/recipes-extended/libvirt/libvirt/hook_support.py
index 7c5e2a94..63e78b79 100755
--- a/recipes-extended/libvirt/libvirt/hook_support.py
+++ b/recipes-extended/libvirt/libvirt/hook_support.py
@@ -35,7 +35,7 @@ def main():
                         stdin_save = sys.stdin.readlines()
                 # Match the name name of the hook + a dash + atleast
                 # one alpha-numeric character.
-                matcher = re.compile( "%s-\w+" % hook_name )
+                matcher = re.compile( rf"%s-\w+" % hook_name )
                 for file_name in sorted( os.listdir( hook_dir ) ):
                         file_path = os.path.join( hook_dir, file_name )
                         if matcher.match( file_name ) \
@@ -43,7 +43,7 @@ def main():
                            and os.path.isfile( file_path ) \
                            and return_value == 0:
                                 cmd = [ file_path ] + hook_args
-                                p = subprocess.Popen( cmd, stdin=subprocess.PIPE )
+                                p = subprocess.Popen( cmd, stdin=subprocess.PIPE, text=True )
                                 p.communicate( input = ''.join( stdin_save ) )[0]
                                 return_value = p.wait()
         except Exception as e: