init: Special case logd

Logd is a special case. Every other service effectively has an implicit
dependency on it for sending log messages to it and even init itself
depends on it for it's own log messages.

init.d/00_logging_ramfs.service

@@ -0,0 +1,13 @@
+{
+    "unit": {
+        "default_dependencies": false,
+        "requires_weak": ["00_randd.service"]
+    },
+    "service": {
+        "cmd": "ramfs",
+        "args": ["logging"],
+        "type": {
+            "scheme": "logging"
+        }
+    }
+}

init.d/00_runtime.target

@@ -6,7 +6,8 @@
             "00_nulld.service",
             "00_randd.service",
             "00_rtcd.service",
-            "00_zerod.service"
+            "00_zerod.service",
+            "00_logging_ramfs.service"
         ]
     }
 }

init.d/10_logging

@@ -1,4 +0,0 @@
-requires_weak 00_runtime.target
-scheme log logd
-stdio /scheme/log
-scheme logging ramfs logging

init.d/20_graphics

@@ -1,4 +1,3 @@
-requires_weak 10_logging
 scheme input inputd
 notify FRAMEBUFFER_ADDR=$ FRAMEBUFFER_VIRT=$ FRAMEBUFFER_WIDTH=$ FRAMEBUFFER_HEIGHT=$ FRAMEBUFFER_STRIDE=$ vesad
 scheme fbbootlog fbbootlogd

init/src/main.rs

@@ -135,11 +135,6 @@ fn run_command(cmd: Command, config: &mut InitConfig) {
         Command::RequiresWeak(_) => {} // handled by unit parsing code
         Command::Nothing => {}
         Command::Echo(text) => println!("{text}"),
-        Command::Stdio(stdio) => {
-            if let Err(err) = switch_stdio(&stdio) {
-                eprintln!("init: failed to switch stdio to '{}': {}", stdio, err);
-            }
-        }
         Command::Service(service) => {
             if config.skip_cmd.contains(&service.cmd) {
                 eprintln!(
@@ -166,6 +161,13 @@ fn main() {
     }
     .apply(&mut pending_units, &mut unit_store, &mut init_config);
 
+    let mut command = std::process::Command::new("logd");
+    command.env_clear().envs(&init_config.envs);
+    daemon::SchemeDaemon::spawn(command, "log");
+    if let Err(err) = switch_stdio("/scheme/log") {
+        eprintln!("init: failed to switch stdio to '/scheme/log': {err}");
+    }
+
     let runtime_target = UnitId("00_runtime.target".to_owned());
 
     'a: while let Some(unit) = pending_units.pop_front() {

init/src/script.rs

@@ -45,9 +45,6 @@ pub enum Command {
     // Service
     Service(Service),
 
-    // Modify env
-    Stdio(String),
-
     // Misc
     Echo(String),
     Nothing,
@@ -62,12 +59,6 @@ impl Command {
         match cmd.as_str() {
             "requires_weak" => Ok(Command::RequiresWeak(args.map(UnitId).collect::<Vec<_>>())),
             "echo" => Ok(Command::Echo(args.collect::<Vec<_>>().join(" "))),
-            "stdio" => {
-                let Some(stdio) = args.next() else {
-                    return Err("init: failed to set stdio: no argument".to_owned());
-                };
-                Ok(Command::Stdio(stdio))
-            }
             "notify" => {
                 let process = Process::parse(args)?;