client, server: don't require root for completions command

client/src/main.rs

@@ -992,16 +992,16 @@ fn main() {
 }
 
 fn run(opt: Opts) -> Result<(), Error> {
-    if unsafe { libc::getuid() } != 0 {
-        return Err("innernet must run as root.".into());
-    }
-
     let command = opt.command.unwrap_or(Command::Show {
         short: false,
         tree: false,
         interface: None,
     });
 
+    if unsafe { libc::getuid() } != 0 && !matches!(command, Command::Completions { .. }) {
+        return Err("innernet must run as root.".into());
+    }
+
     match command {
         Command::Install {
             invite,

server/src/main.rs

@@ -227,7 +227,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
     pretty_env_logger::init();
     let opt = Opt::from_args();
 
-    if unsafe { libc::getuid() } != 0 {
+    if unsafe { libc::getuid() } != 0 && !matches!(opt.command, Command::Completions { .. }) {
         return Err("innernet-server must run as root.".into());
     }