yavdr-ansible/library/xrandr_facts.py

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#!/usr/bin/env python2
from __future__ import print_function
import ast
import binascii
import csv
import os
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import re
import subprocess
from collections import namedtuple
from glob import glob
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from ansible.module_utils.basic import AnsibleModule
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DOCUMENTATION = '''
---
module: xrandr_facts
short_description: "gather facts about connected monitors and available modelines"
description:
- This module needs a running x-server on a given display in
order to successfully call xrandr. Returns the dictionary
"xrandr", wich contains all screens with output states,
connected displays, EDID info and their modes and a
recommendation for the best fitting tv mode, the dictionary
"xorg" with a recommendation for the primary and secondary
output and a "drm" dictionary whose "primary" key associates
the primary device name of the drm subsystem with the one from
the xrandr output by comparing the edid data and a list of
"ignored_devices". Note that the proprietary nvidia driver
doesn't support KMS/drm, so in this case the dictionary is
always empty.
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options:
display:
required: False
default: ":0"
description:
- the DISPLAY variable to use when calling xrandr
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preferred_outputs:
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required: False
default: ["HDMI", "DP", "eDP", "DVI", "VGA", "TV", "Virtual"]
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description:
- ranking of the preferred display connectors
preferred_refreshrates:
required: False
default: ["50", "60", "75", "30", "25"]
description:
- ranking of the preferred display refreshrate
preferred_resolutions:
required: False
default: ["7680x4320", "3840x2160", "1920x1080", "1280x720", "720x576"]
description:
- ranking of the preferred display resolutions
write_edids:
required: False
default: True
description:
- write edid data to /etc/X11/edid.{connector}.bin
- the dictionary "drm" can only be filled with data if write_edids is enabled
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'''
EXAMPLES = '''
- name: "collect facts for connected displays"
action: xserver_facts
display: ":0"
- debug:
var: xrandr
- debug:
var: xorg
- debug:
var: drm
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'''
ARG_SPECS = {
'display': dict(default=":0", type='str', required=False),
'preferred_outputs': dict(
default=["HDMI", "DP", "eDP", "DVI", "VGA", "TV", "Virtual"], type='list', required=False),
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'preferred_refreshrates': dict(
default=[50, 60, 75, 30, 25], type='list', required=False),
'preferred_resolutions': dict(
default=[
"7680x4320", "3840x2160", "1920x1080", "1280x720", "720x576"],
type='list', required=False),
'write_edids': dict(default=True, type='bool', required=False),
}
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SCREEN_REGEX = re.compile(r"^(?P<screen>Screen\s\d+:)(?:.*)")
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CONNECTOR_REGEX = re.compile(
r"^(?P<connector>.*-?\d+)\s(?P<connection_state>connected|disconnected)\s(?P<primary>primary)?")
MODE_REGEX = re.compile(r"^\s+(?P<resolution>\d{3,}x\d{3,}).*")
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Mode = namedtuple('Mode', ['connection', 'resolution', 'refreshrate'])
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def check_for_screen(line):
"""check line for screen information"""
match = re.match(SCREEN_REGEX, line)
if match:
return match.groupdict()['screen']
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def check_for_connection(line):
"""check line for connection name and state"""
match = re.match(CONNECTOR_REGEX, line)
connector = None
is_connected = False
if match:
match = match.groupdict()
connector = match['connector']
is_connected = True if match['connection_state'] == 'connected' else False
return connector, is_connected
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def get_indentation(line):
"""return the number of leading whitespace characters"""
return len(line) - len(line.lstrip())
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def sort_mode(mode):
"""rate modes by several criteria"""
connection_score = 0
rrate_score = 0
resolution_score = 0
preferred_rrates = module.params['preferred_refreshrates']
# [50, 60]
preferred_resolutions = module.params['preferred_resolutions']
# ["7680x4320", "3840x2160", "1920x1080", "1280x720", "720x576"]
preferred_outputs = module.params['preferred_outputs']
# ["HDMI", "DP", "DVI", "VGA"]
if mode.refreshrate in preferred_rrates:
rrate_score = len(preferred_rrates) - preferred_rrates.index(mode.refreshrate)
if mode.resolution in preferred_resolutions:
resolution_score = len(preferred_resolutions) - preferred_resolutions.index(mode.resolution)
x_resolution, y_resolution = (int(n) for n in mode.resolution.split('x'))
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connection = mode.connection.split('-')[0]
if connection in preferred_outputs:
connection_score = len(preferred_outputs) - preferred_outputs.index(connection)
return (rrate_score, resolution_score, x_resolution, y_resolution, connection_score)
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def parse_xrandr_verbose(iterator):
"""parse the output of xrandr --verbose using an iterator delivering single lines"""
xorg = {}
is_connected = False
for line in iterator:
if line.startswith('Screen'):
screen = check_for_screen(line)
xorg[screen] = {}
elif 'connected' in line:
connector, is_connected = check_for_connection(line)
xorg[screen][connector] = {
'is_connected': is_connected,
'EDID': '',
'modes': {},
'preferred': '',
'current': '',
'auto': '',
}
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elif is_connected and 'EDID:' in line:
edid_str = ""
outer_indentation = get_indentation(line)
while True:
line = next(iterator)
if get_indentation(line) > outer_indentation:
edid_str += line.strip()
else:
break
xorg[screen][connector]['EDID'] = edid_str
elif is_connected and "MHz" in line and "Interlace" not in line:
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match = re.match(MODE_REGEX, line)
if match:
match = match.groupdict()
preferred = bool("+preferred" in line)
current = bool("*current" in line)
while True:
line = next(iterator)
if line.strip().startswith('v:'):
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refresh_rate = ast.literal_eval(line.split()[-1][:-2])
rrate = int(round(refresh_rate))
if xorg[screen][connector]['modes'].get(match['resolution']) is None:
xorg[screen][connector]['modes'][match['resolution']] = []
if rrate not in xorg[screen][connector]['modes'][match['resolution']]:
xorg[screen][connector]['modes'][match['resolution']].append(rrate)
if preferred:
xorg[screen][connector]['preferred'] = "{}_{}".format(
match['resolution'], rrate)
if current:
xorg[screen][connector]['current'] = "{}_{}".format(
match['resolution'], rrate)
break
return xorg
def parse_edid_data(edid):
vendor = "Unknown"
model = "Unknown"
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modelines = []
try:
data = subprocess.check_output("parse-edid < {}".format(edid),
shell=True, universal_newlines=True)
except subprocess.CalledProcessError:
pass
else:
for line in data.splitlines():
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line = line.strip()
if "VendorName" in line:
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vendor = line.split('"')[1]
if "ModelName" in line:
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model = line.split('"')[1]
if "Modeline" in line:
print(line)
_, _, line = line.split('"', 2)
if not line:
print("no timing information")
continue
try:
FF, H1, H2, H3, H4, V1, V2, V3, V4, FLAGS = line.split(None, 9)
except ValueError:
print("invalid timing information")
continue
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print(FF, H1, H2, H3, H4, V1, V2, V3, V4, FLAGS)
refresh = round(float(FF) * 1E6 / (float(H4) * float(V4)))
interlaced = "interlaced" in FLAGS
if interlaced:
refresh /= 2
refresh = int(refresh)
modeline_name = '"{}x{}_{}{}"'.format(H1, V1, refresh, "i" if interlaced else '')
modelines.append(" ".join(("Modeline", modeline_name,
FF, H1, H2, H3, H4, V1, V2, V3, V4, FLAGS)))
return vendor, model, modelines
def collect_nvidia_data():
BusID_RE = re.compile((
r'(?P<domain>[0-9a-fA-F]+)'
r':'
r'(?P<bus>[0-9a-fA-F]+)'
r':'
r'(?P<device>[0-9a-fA-F]+)'
r'\.'
r'(?P<function>[0-9a-fA-F]+)'
))
try:
data = subprocess.check_output(["nvidia-smi", "--query-gpu=name,pci.bus_id",
"--format=csv", "-i0"], universal_newlines=True)
except subprocess.CalledProcessError:
pass
except OSError:
# nvidia-smi is not installed
pass
else:
for row in csv.DictReader(data.splitlines(), delimiter=',', skipinitialspace=True):
name = row['name']
bus_id = row['pci.bus_id']
# pci.bus_id structure as reported by nvidia-smi: "domain:bus:device.function", in hex.
match = BusID_RE.search(bus_id)
if match:
domain, bus, device, function = (int(n, 16) for n in match.groups())
bus_id = "PCI:{:d}@{:d}:{:d}:{:d}".format(bus, domain, device, function)
return name, bus_id
raise ValueError
def find_drm_connectors(connections):
"""
returns a dict with the following schema (secondary may be empty):
{
'primary': {
'edid': 'edid.HDMI-1.bin',
'drm_connector': 'HDMI-A-1',
'xrandr_connector': 'HDMI-1',
},
'secondary': {
'edid': 'edid.eDP-1.bin',
'drm_connector': 'eDP-1',
'xrandr_connector': 'eDP-1',
}
'ignored_outputs': ['HDMI-A-2', 'DP-1']
}
"""
STATUS_GLOB = '/sys/class/drm/card0*/status'
CONNECTOR_RE = re.compile('card0-(?P<connector>[^/]+)/status')
def read_edid_bytes(edid_file):
edid_bytes = b''
try:
with open(edid_file, 'rb') as f:
edid_bytes = f.read()
except IOError:
pass
return edid_bytes
xrandr_edid_bytes = read_edid_bytes(connections.get('primary', {}).get('edid', ""))
secondary_xrandr_edid_bytes = read_edid_bytes(connections.get('secondary', {}).get('edid', ''))
drm = {'primary': {}, 'secondary': {}, 'ignored_outputs': []}
for status_p in glob(STATUS_GLOB):
match = re.search(CONNECTOR_RE, status_p)
if match:
drm_connector = match.group('connector')
else:
continue
try:
with open(status_p) as f:
connected = f.read().strip() == 'connected'
except IOError:
continue
if connected:
edid = read_edid_bytes(os.path.join(
os.path.dirname(status_p), 'edid'))
if edid:
if edid == xrandr_edid_bytes:
drm['primary'] = {
'edid': os.path.basename(connections['primary'].get('edid', "")),
'drm_connector': drm_connector,
'xrandr_connector': connections['primary'].get('connector',''),
}
continue
if secondary_xrandr_edid_bytes:
drm['secondary'] = {
'edid': os.path.basename(connections.get('secondary').get('edid', '')),
'drm_connector': drm_connector,
'xrandr_connector': connections['secondary'].get('connector',''),
}
continue
drm['ignored_outputs'].append(drm_connector)
return drm
def output_data(data, write_edids=True):
result = {}
drm = {}
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if data:
modes = []
for _, screen_data in data.items():
for connector, connection_data in screen_data.items():
if connection_data.get('EDID') and write_edids:
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with open('/etc/X11/edid.{}.bin'.format(connector), 'wb') as edid:
edid.write(binascii.a2b_hex(connection_data['EDID']))
for resolution, refreshrates in connection_data['modes'].items():
for refreshrate in refreshrates:
modes.append(Mode(connector, resolution, refreshrate))
if modes:
try:
gpu_name, bus_id = collect_nvidia_data()
except ValueError:
gpu_name = None
bus_id = None
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def create_entry(my_dict, name, connector, resolution, refreshrate, vendor, model, modelines):
my_dict[name] = {
'connector': connector,
'resolution': resolution,
'refreshrate': refreshrate,
'edid': '/etc/X11/edid.{}.bin'.format(connector),
'mode': "{}_{}".format(resolution, refreshrate),
'vendor': vendor,
'model': model,
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'modelines': modelines,
}
if gpu_name and bus_id:
result[name]['gpu_name'] = gpu_name
result[name]['bus_id'] = bus_id
connector_0, resolution_0, refreshrate_0 = max(modes, key=sort_mode)[:3]
connector_0_edid = '/etc/X11/edid.{}.bin'.format(connector_0)
vendor_0, model_0, modelines_0 = parse_edid_data(connector_0_edid)
create_entry(result, 'primary', connector_0, resolution_0,
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refreshrate_0, vendor_0, model_0, modelines_0)
# check if additional monitors exist
other_modes = [mode for mode in modes if mode[0] != connector_0]
if other_modes:
connector_1, resolution_1, refreshrate_1 = max(other_modes, key=sort_mode)[:3]
connector_1_edid = '/etc/X11/edid.{}.bin'.format(connector_1)
vendor_1, model_1, modelines_1 = parse_edid_data(connector_1_edid)
create_entry(result, 'secondary', connector_1, resolution_1,
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refreshrate_1, vendor_1, model_1, modelines_1)
if write_edids:
drm = find_drm_connectors(result)
module.exit_json(changed=True if write_edids else False,
ansible_facts={'xrandr': data, 'xorg': result, 'drm': drm})
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if __name__ == '__main__':
module = AnsibleModule(argument_spec=ARG_SPECS, supports_check_mode=False,)
try:
d = subprocess.check_output(['xrandr', '-d', module.params['display'], '--verbose'],
universal_newlines=True).splitlines()
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except subprocess.CalledProcessError:
xorg_data = {}
else:
xorg_data = parse_xrandr_verbose(iter(d))
output_data(xorg_data, module.params['write_edids'])