lcd: T2564: add CLI support

- set system lcd model
- set system lcd device

3 files changed, 134 insertions, 0 deletions

diff --git a/src/conf_mode/system_lcd.py b/src/conf_mode/system_lcd.py
new file mode 100755
index 000000000..7cdc1fd92
--- /dev/null
+++ b/src/conf_mode/system_lcd.py
@@ -0,0 +1,110 @@
+#!/usr/bin/env python3
+#
+# Copyright 2020 VyOS maintainers and contributors <maintainers@vyos.io>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 or later as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import os
+import vyos.defaults
+
+from jinja2 import FileSystemLoader, Environment
+from sys import exit
+
+from vyos.config import Config
+from vyos import ConfigError
+
+lcdd_conf = '/run/LCDd/LCDd.conf'
+lcdproc_conf = '/run/lcdproc/lcdproc.conf'
+
+def get_config():
+    base = 'system lcd'
+    conf = Config()
+    lcd = {}
+    if conf.exists(base):
+        conf.set_level(base)
+
+        if conf.exists('device'):
+            tmp = conf.return_value('device')
+            lcd.update({'device' : tmp})
+
+        if conf.exists('model'):
+            tmp = conf.return_value('model')
+            lcd.update({'model' : tmp})
+
+    # Return (possibly empty) dictionary
+    return lcd
+
+def verify(lcd):
+    if not lcd:
+        return None
+
+    if 'model' in lcd and lcd['model'] in ['sdec']:
+        # This is a fixed LCD display, no device needed - bail out early
+        return None
+
+    if not {'device', 'model'} <= set(lcd):
+        raise ConfigError('Both device and driver must be set!')
+
+    return None
+
+def generate(lcd):
+    if not lcd:
+        return None
+
+    if 'device' in lcd:
+        lcd['device'] = '/dev/' + lcd['device']
+
+    tmpl_path = os.path.join(vyos.defaults.directories['data'], 'templates')
+    fs_loader = FileSystemLoader(tmpl_path)
+    env = Environment(loader=fs_loader)
+
+    # create configuration directories
+    for file in [lcdd_conf, lcdproc_conf]:
+        path = os.path.dirname(file)
+        if not os.path.isdir(path):
+            os.mkdir(path, mode=0o755)
+
+    lcdd_conf_tmpl = env.get_template('lcd/LCDd.conf.tmpl')
+    tmp = lcdd_conf_tmpl.render(lcd)
+    with open(lcdd_conf, 'w') as f:
+        f.write(tmp)
+
+    lcdproc_conf_tmpl = env.get_template('lcd/lcdproc.conf.tmpl')
+    tmp = lcdproc_conf_tmpl.render(lcd)
+    with open(lcdproc_conf, 'w') as f:
+        f.write(tmp)
+
+    return None
+
+def apply(lcd):
+    if not lcd:
+        os.system('sudo systemctl stop lcdproc.service LCDd.service')
+
+        for file in [lcdd_conf, lcdproc_conf]:
+            if os.path.exists(file):
+                os.remove(file)
+    else:
+        # Restart server
+        os.system('sudo systemctl restart LCDd.service lcdproc.service')
+
+    return None
+
+if __name__ == '__main__':
+    try:
+        c = get_config()
+        verify(c)
+        generate(c)
+        apply(c)
+    except ConfigError as e:
+        print(e)
+        exit(1)
diff --git a/src/systemd/LCDd.service b/src/systemd/LCDd.service
new file mode 100644
index 000000000..85cdf561b
--- /dev/null
+++ b/src/systemd/LCDd.service
@@ -0,0 +1,11 @@
+[Unit]
+Description=LCD display daemon
+Documentation=man:LCDd(8) http://www.lcdproc.org/
+After=vyos-router.service
+
+[Service]
+User=root
+ExecStart=/usr/sbin/LCDd -c /run/LCDd/LCDd.conf
+
+[Install]
+WantedBy=multi-user.target
diff --git a/src/systemd/lcdproc.service b/src/systemd/lcdproc.service
new file mode 100644
index 000000000..ef717667a
--- /dev/null
+++ b/src/systemd/lcdproc.service
@@ -0,0 +1,13 @@
+[Unit]
+Description=LCDproc system status information viewer on %I
+Documentation=man:lcdproc(8) http://www.lcdproc.org/
+After=vyos-router.service LCDd.service
+Requires=LCDd.service
+
+[Service]
+User=root
+ExecStart=/usr/bin/lcdproc -f -c /run/lcdproc/lcdproc.conf
+PIDFile=/run/lcdproc/lcdproc.pid
+
+[Install]
+WantedBy=multi-user.target