conserver: T4717: Support for setting a name for console-server devices

This adds a new 'alias' property to the console-server device definition
to allow users to connect to a console using a human-readable name
rather than just the device name.

For a configuration like:
service {
  console-server {
    device ttyUSB0 {
      speed 115200
      alias my-server
    }
  }
}

Users can connect either by doing `connect console ttyUSB0`, or
`connect console my-server`.

Names:
* Must be unique
* Are limited to 128 characters
* Are optional - if not specified, only the `connect console ttyX`
  form can be used

2 files changed, 11 insertions, 0 deletions

diff --git a/src/completion/list_consoles.sh b/src/completion/list_consoles.sh
new file mode 100755
index 000000000..52278c4cb
--- /dev/null
+++ b/src/completion/list_consoles.sh
@@ -0,0 +1,4 @@
+#!/bin/sh
+
+# For lines like `aliases "foo";`, regex matches everything between the quotes
+grep -oP '(?<=aliases ").+(?=";)' /run/conserver/conserver.cf
\ No newline at end of file
diff --git a/src/conf_mode/service_console-server.py b/src/conf_mode/service_console-server.py
index a2e411e49..ee4fe42ab 100755
--- a/src/conf_mode/service_console-server.py
+++ b/src/conf_mode/service_console-server.py
@@ -61,6 +61,7 @@ def verify(proxy):
     if not proxy:
         return None
 
+    aliases = []
     processes = process_iter(['name', 'cmdline'])
     if 'device' in proxy:
         for device, device_config in proxy['device'].items():
@@ -75,6 +76,12 @@ def verify(proxy):
             if 'ssh' in device_config and 'port' not in device_config['ssh']:
                 raise ConfigError(f'Port "{device}" requires SSH port to be set!')
 
+            if 'alias' in device_config:
+                if device_config['alias'] in aliases:
+                    raise ConfigError("Console aliases must be unique")
+                else:
+                    aliases.append(device_config['alias'])
+
     return None
 
 def generate(proxy):