From 1b50d1b5432f9505ebf9d32f7d6228bf24314264 Mon Sep 17 00:00:00 2001
From: bjorn3 <17426603+bjorn3@users.noreply.github.com>
Date: Sun, 5 Apr 2026 17:31:16 +0200
Subject: [PATCH] init: Inline SwitchRoot

---
 init/src/main.rs | 131 ++++++++++++++++++++++-------------------------
 1 file changed, 60 insertions(+), 71 deletions(-)

diff --git a/init/src/main.rs b/init/src/main.rs
index ae4ec0f7bd..16c2b3a7ca 100644
--- a/init/src/main.rs
+++ b/init/src/main.rs
@@ -2,7 +2,7 @@ use std::collections::BTreeMap;
 use std::env;
 use std::ffi::OsString;
 use std::io::Result;
-use std::path::{Path, PathBuf};
+use std::path::Path;
 
 use libredox::flag::{O_RDONLY, O_WRONLY};
 
@@ -50,65 +50,22 @@ impl InitConfig {
     }
 }
 
-struct SwitchRoot {
-    prefix: PathBuf,
-    etcdir: PathBuf,
-    target: Option<UnitId>,
-}
+fn switch_root(unit_store: &mut UnitStore, config: &mut InitConfig, prefix: &Path, etcdir: &Path) {
+    eprintln!(
+        "init: switchroot to {} {}",
+        prefix.display(),
+        etcdir.display()
+    );
 
-impl SwitchRoot {
-    fn apply(self, scheduler: &mut Scheduler, unit_store: &mut UnitStore, config: &mut InitConfig) {
-        eprintln!(
-            "init: switchroot to {} {}",
-            self.prefix.display(),
-            self.etcdir.display()
-        );
+    config
+        .envs
+        .insert("PATH".to_owned(), prefix.join("bin").into_os_string());
+    config.envs.insert(
+        "LD_LIBRARY_PATH".to_owned(),
+        prefix.join("lib").into_os_string(),
+    );
 
-        config
-            .envs
-            .insert("PATH".to_owned(), self.prefix.join("bin").into_os_string());
-        config.envs.insert(
-            "LD_LIBRARY_PATH".to_owned(),
-            self.prefix.join("lib").into_os_string(),
-        );
-
-        unit_store.config_dirs = vec![
-            self.prefix.join("lib").join("init.d"),
-            self.etcdir.join("init.d"),
-        ];
-
-        if self.prefix == Path::new("/scheme/initfs") {
-            let unit_id = UnitId("00_runtime.target".to_owned());
-            scheduler.schedule_start_and_report_errors(unit_store, unit_id.clone());
-            unit_store.set_runtime_target(unit_id);
-        }
-
-        if let Some(target) = self.target {
-            scheduler.schedule_start_and_report_errors(unit_store, target);
-        } else {
-            let entries = match config::config_for_dirs(&unit_store.config_dirs) {
-                Ok(entries) => entries,
-                Err(err) => {
-                    eprintln!(
-                        "init: failed to read configs from {}: {err}",
-                        unit_store
-                            .config_dirs
-                            .iter()
-                            .map(|dir| dir.display().to_string())
-                            .collect::<Vec<_>>()
-                            .join(", ")
-                    );
-                    return;
-                }
-            };
-            for entry in entries {
-                scheduler.schedule_start_and_report_errors(
-                    unit_store,
-                    UnitId(entry.file_name().unwrap().to_str().unwrap().to_owned()),
-                );
-            }
-        }
-    }
+    unit_store.config_dirs = vec![prefix.join("lib").join("init.d"), etcdir.join("init.d")];
 }
 
 fn run(unit: &mut Unit, config: &mut InitConfig) -> Result<()> {
@@ -173,12 +130,19 @@ fn main() {
     let mut unit_store = UnitStore::new();
     let mut scheduler = Scheduler::new();
 
-    SwitchRoot {
-        prefix: Path::new("/scheme/initfs").to_owned(),
-        etcdir: Path::new("/scheme/initfs/etc").to_owned(),
-        target: Some(UnitId("90_initfs.target".to_owned())),
-    }
-    .apply(&mut scheduler, &mut unit_store, &mut init_config);
+    switch_root(
+        &mut unit_store,
+        &mut init_config,
+        Path::new("/scheme/initfs"),
+        Path::new("/scheme/initfs/etc"),
+    );
+
+    let runtime_target = UnitId("00_runtime.target".to_owned());
+    scheduler.schedule_start_and_report_errors(&mut unit_store, runtime_target.clone());
+    unit_store.set_runtime_target(runtime_target);
+
+    scheduler
+        .schedule_start_and_report_errors(&mut unit_store, UnitId("90_initfs.target".to_owned()));
 
     let mut command = std::process::Command::new("logd");
     command.env_clear().envs(&init_config.envs);
@@ -189,13 +153,38 @@ fn main() {
 
     scheduler.step(&mut unit_store, &mut init_config);
 
-    SwitchRoot {
-        prefix: PathBuf::from("/usr"),
-        etcdir: PathBuf::from("/etc"),
-        // FIXME make target non-optional once there is a multi-user.target unit
-        target: None, //UnitId("multi-user.target".to_owned()),
-    }
-    .apply(&mut scheduler, &mut unit_store, &mut init_config);
+    switch_root(
+        &mut unit_store,
+        &mut init_config,
+        Path::new("/usr"),
+        Path::new("/etc"),
+    );
+    {
+        // FIXME introduce multi-user.target unit and replace the config dir iteration
+        // scheduler.schedule_start_and_report_errors(&mut unit_store, UnitId("multi-user.target".to_owned()));
+
+        let entries = match config::config_for_dirs(&unit_store.config_dirs) {
+            Ok(entries) => entries,
+            Err(err) => {
+                eprintln!(
+                    "init: failed to read configs from {}: {err}",
+                    unit_store
+                        .config_dirs
+                        .iter()
+                        .map(|dir| dir.display().to_string())
+                        .collect::<Vec<_>>()
+                        .join(", ")
+                );
+                return;
+            }
+        };
+        for entry in entries {
+            scheduler.schedule_start_and_report_errors(
+                &mut unit_store,
+                UnitId(entry.file_name().unwrap().to_str().unwrap().to_owned()),
+            );
+        }
+    };
 
     scheduler.step(&mut unit_store, &mut init_config);