DIAG: log service spawn/wait; temporarily revert switch_root chdir to test spawn hang

init/src/main.rs

@@ -54,21 +54,9 @@ impl InitConfig {
 fn switch_root(unit_store: &mut UnitStore, config: &mut InitConfig, prefix: &Path, etcdir: &Path) {
     status_ok(&format!("switchroot to {} {}", prefix.display(), etcdir.display()));
 
-    // Point init's working directory at a valid directory in the new root so
-    // daemons spawned afterwards don't inherit an invalid CWD (via
-    // AT_REDOX_CWD_FD). Without this, getcwd() fails in /usr binaries — e.g.
-    // the 00_base-env `zsh -c` setup printed "zsh: Failed to get current
-    // directory: path invalid" and then hung, so init (which waits on that
-    // oneshot) never reached the login stack. The switch is logical (no
-    // chroot) and `prefix` (e.g. "/usr") is not itself a directory, so try the
-    // plausible roots in order and keep the first that works.
-    let cwd_candidates = [prefix.to_path_buf(), std::path::PathBuf::from("/")];
-    if !cwd_candidates
-        .iter()
-        .any(|cand| std::env::set_current_dir(cand).is_ok())
-    {
-        init_warn("failed to establish a valid working directory after switch_root");
-    }
+    // DIAGNOSTIC: chdir temporarily removed to test whether it was causing the
+    // first /usr Command::spawn() to hang (relibc posix_spawn opens the cwd
+    // fd). Re-add a correct CWD fix once the spawn hang is understood.
 
     config
         .envs

init/src/service.rs

@@ -70,6 +70,8 @@ impl Service {
             .unwrap_or_else(|e| panic!("pipe() failed in service.spawn for {}: {}", self.cmd, e));
         unsafe { pass_fd(&mut command, "INIT_NOTIFY", write_pipe.into()) };
 
+        eprintln!("init-diag: SPAWNING {}", self.cmd);
+        let _ = io::stderr().flush();
         let mut child = match command.spawn() {
             Ok(child) => child,
             Err(err) => {
@@ -77,6 +79,8 @@ impl Service {
                 return;
             }
         };
+        eprintln!("init-diag: SPAWNED {} (type {:?})", self.cmd, self.type_);
+        let _ = io::stderr().flush();
 
         match &self.type_ {
             ServiceType::Notify => {
@@ -126,6 +130,8 @@ impl Service {
             }
             ServiceType::Oneshot => {
                 drop(read_pipe);
+                eprintln!("init-diag: WAITING {}", self.cmd);
+                let _ = io::stderr().flush();
                 match child.wait() {
                     Ok(exit_status) => {
                         if !exit_status.success() {