1 files changed, 134 insertions, 0 deletions
diff --git a/src/conf_mode/system_console.py b/src/conf_mode/system_console.py
new file mode 100755
index 000000000..0831232fb
--- /dev/null
+++ b/src/conf_mode/system_console.py
@@ -0,0 +1,134 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2020 VyOS maintainers and contributors
+#
+# 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 re
+
+from fileinput import input as replace_in_file
+from vyos.config import Config
+from vyos.util import call
+from vyos.template import render
+from vyos import ConfigError, airbag
+airbag.enable()
+
+by_bus_dir = '/dev/serial/by-bus'
+
+def get_config():
+    conf = Config()
+    base = ['system', 'console']
+
+    # retrieve configuration at once
+    console = conf.get_config_dict(base)
+
+    # bail out early if no serial console is configured
+    if 'device' not in console.keys():
+        return console
+
+    # convert CLI values to system values
+    for device in console['device'].keys():
+        # no speed setting has been configured - use default value
+        if not 'speed' in console['device'][device].keys():
+            tmp = { 'speed': '' }
+            if device.startswith('hvc'):
+                tmp['speed'] = 38400
+            else:
+                tmp['speed'] = 115200
+
+            console['device'][device].update(tmp)
+
+        if device.startswith('usb'):
+            # It is much easiert to work with the native ttyUSBn name when using
+            # getty, but that name may change across reboots - depending on the
+            # amount of connected devices. We will resolve the fixed device name
+            # to its dynamic device file - and create a new dict entry for it.
+            by_bus_device = f'{by_bus_dir}/{device}'
+            if os.path.isdir(by_bus_dir) and os.path.exists(by_bus_device):
+                tmp = os.path.basename(os.readlink(by_bus_device))
+                # updating the dict must come as last step in the loop!
+                console['device'][tmp] = console['device'].pop(device)
+
+    return console
+
+def verify(console):
+    return None
+
+def generate(console):
+    base_dir = '/etc/systemd/system'
+    # Remove all serial-getty configuration files in advance
+    for root, dirs, files in os.walk(base_dir):
+        for basename in files:
+            if 'serial-getty' in basename:
+                call(f'systemctl stop {basename}')
+                os.unlink(os.path.join(root, basename))
+
+    for device in console['device'].keys():
+        config_file = base_dir + f'/serial-getty@{device}.service'
+        render(config_file, 'getty/serial-getty.service.tmpl', console['device'][device])
+
+    # Reload systemd manager configuration
+    call('systemctl daemon-reload')
+
+    # GRUB
+    # For existing serial line change speed (if necessary)
+    # Only applys to ttyS0
+    if 'ttyS0' not in console['device'].keys():
+        return None
+
+    speed = console['device']['ttyS0']['speed']
+    grub_config = '/boot/grub/grub.cfg'
+    if not os.path.isfile(grub_config):
+        return None
+
+    # stdin/stdout are redirected in replace_in_file(), thus print() is fine
+    p = re.compile(r'^(.* console=ttyS0),[0-9]+(.*)$')
+    for line in replace_in_file(grub_config, inplace=True):
+        if line.startswith('serial --unit'):
+            line = f'serial --unit=0 --speed={speed}\n'
+        elif p.match(line):
+            line = '{},{}{}\n'.format(p.search(line)[1], speed, p.search(line)[2])
+
+        print(line, end='')
+
+    return None
+
+def apply(console):
+    # reset screen blanking
+    call('/usr/bin/setterm -blank 0 -powersave off -powerdown 0 -term linux </dev/tty1 >/dev/tty1 2>&1')
+    if not console:
+        return None
+
+    if 'powersave' in console.keys():
+        # Configure screen blank powersaving on VGA console
+        call('/usr/bin/setterm -blank 15 -powersave powerdown -powerdown 60 -term linux </dev/tty1 >/dev/tty1 2>&1')
+
+    # Start getty process on configured serial interfaces
+    for device in console['device'].keys():
+        # Only start console if it exists on the running system. If a user
+        # detaches a USB serial console and reboots - it should not fail!
+        if os.path.exists(f'/dev/{device}'):
+            call(f'systemctl start serial-getty@{device}.service')
+
+    return None
+
+if __name__ == '__main__':
+    try:
+        c = get_config()
+        verify(c)
+        generate(c)
+        apply(c)
+    except ConfigError as e:
+        print(e)
+        exit(1)