118 lines
4.0 KiB
Django/Jinja
118 lines
4.0 KiB
Django/Jinja
#!/usr/bin/env python3
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"""
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{{ ansible_managed }}
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This Script changes the monitor in KODI's guisettings.xml to the wanted output
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according to the DISPLAY environment variable. It works with KODI 18 (not KODI 17!).
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In order to change the display we need to modify the settings/videoscreen nodes.
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Basic algorithm:
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- get the current videoscreen.monitor
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- check if it needs to be changed
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- create a backup of the videoscreen nodes in /var/lib/vdr/.kodi/.display_cache/{CONNETOR}-videoscreen.xml
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- check if there is an existing backup for the new CONNECTOR
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- parse the backup of the videoscreen nodes
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- replace the videoscreen nodes with the backup data
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"""
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import copy
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import os
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import sys
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import subprocess
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from lxml import etree as ET
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GUISETTINGS = '/var/lib/vdr/.kodi/userdata/guisettings.xml'
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CACHE_DIR = '/var/lib/vdr/.kodi/.display_cache'
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VIDEOSCREEN_TEMPLATE = """<settings version="2">
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<setting id="videoscreen.monitor">{}</setting>
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</settings>"""
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def create_cache_dir():
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try:
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os.makedirs(CACHE_DIR, exist_ok=True)
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except PermissionError:
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sys.exit(f"Error: insufficient permissions to create cachedir {CACHE_DIR}")
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except Exception as e:
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sys.exit(f"Unexpected Error when trying to create {CACHE_DIR}:", e)
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def get_output_name():
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"""
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get display name from xrandr output for given DISPLAY environment variable
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"""
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try:
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xrandr_output = [
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l for l in subprocess.check_output(
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["xrandr"],
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env={"DISPLAY": os.environ["DISPLAY"]}
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).decode("utf-8").splitlines()
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]
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return next(l.split()[0] for l in xrandr_output if " connected " in l)
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except Exception as e:
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sys.exit("could not determine output name", e)
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def parse_template(template_path, template, output=""):
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"""read videoscreen settings from backup or create a stub file"""
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try:
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xml_tree = ET.parse(template_path)
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except OSError:
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print(f"{template_path} not found, creating stub file", file=sys.stderr)
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xml_template = ET.fromstring(template.format(output))
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xml_tree = ET.ElementTree(xml_template)
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finally:
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xml_tree.write(template_path)
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return xml_tree
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def main(output):
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guisettings = parse_template(GUISETTINGS, VIDEOSCREEN_TEMPLATE, "Default")
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# parse guisettings Etree for display name an backup videoscreen data
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root = guisettings.getroot()
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old_output = root.find("./setting[@id='videoscreen.monitor']").text
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if old_output == output:
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print("no changes necessary, exiting", file=sys.stderr)
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sys.exit()
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# create a minimal guisettings etree
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xml_path = os.path.join(CACHE_DIR, f'{old_output}-videoscreen.xml')
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base_tree = ET.fromstring('<settings version="2"></settings>')
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xml_tree = ET.ElementTree(base_tree)
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backup_root = xml_tree.getroot()
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# copy videoscreen elements to backup etree
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videoscreen_elements = root.xpath(
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"./setting[starts-with(@id, 'videoscreen.')]")
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for element in videoscreen_elements:
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backup_root.append(copy.deepcopy(element))
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element.getparent().remove(element)
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xml_tree.write(xml_path)
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print(f"written backup for {old_output} to {xml_path}", file=sys.stderr)
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# change videoscreen node to content of backup file
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xml_path = os.path.join(CACHE_DIR, f'{output}-videoscreen.xml')
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videodir_xml = parse_template(xml_path, VIDEOSCREEN_TEMPLATE, output)
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videodir_root = videodir_xml.getroot()
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videoscreen = videodir_root.find("./setting[@id='videoscreen.monitor']")
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# copy videoscreen.* elements from Backup
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videoscreen_elements = videodir_root.xpath(
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"./setting[starts-with(@id, 'videoscreen.')]")
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for element in videoscreen_elements:
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new_element = copy.deepcopy(element)
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root.append(new_element)
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guisettings.write(GUISETTINGS)
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if __name__ == '__main__':
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create_cache_dir()
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output = get_output_name()
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try:
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main(output)
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except Exception as e:
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print("Could not change videoscreen.* settings:", str(e), file=sys.stderr)
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