apps+base+libc: Use /usr/bin paths instead of /bin everywhere

apps/login.cpp

@@ -45,7 +45,7 @@ Result<int> luna_main(int argc, char** argv)
         username = name.view();
     }
 
-    execl("/bin/su", "login", "-lp", "--", username.chars(), nullptr);
+    execl("/usr/bin/su", "login", "-lp", "--", username.chars(), nullptr);
 
     perror("su");
     return 1;

apps/preinit.cpp

@@ -72,10 +72,9 @@ int main()
     // Now, mount the /dev file system on the new root.
     mount_devfs();
 
-    setenv("PATH", "/sbin:/usr/bin", 1);
-    char* argv[] = { "init", nullptr };
+    char* argv[] = { "/usr/bin/init", nullptr };
     char* envp[] = { nullptr };
-    execvpe(argv[0], argv, envp);
+    execve(argv[0], argv, envp);
 
     fail_errno("Failed to execute init");
 

apps/su.cpp

@@ -127,7 +127,7 @@ Result<int> luna_main(int argc, char** argv)
     {
         chdir(entry->pw_dir);
         clearenv();
-        setenv("PATH", "/bin:/sbin", 1);
+        setenv("PATH", "/usr/bin:/usr/local/bin", 1);
         setpgid(0, 0);
     }
 

base/etc/passwd

@@ -1,2 +1,2 @@
-root:toor:0:0:Administrator:/:/bin/sh
-selene:moon:1000:1000:User:/home/selene:/bin/sh
+root:toor:0:0:Administrator:/:/usr/bin/sh
+selene:moon:1000:1000:User:/home/selene:/usr/bin/sh

libc/src/unistd.cpp

@@ -23,7 +23,7 @@ static Result<int> try_execvpe(const char* name, char* const* argv, char* const*
     if (strchr(name, '/')) return execve(name, argv, envp);
 
     char* path = getenv("PATH");
-    if (!path) path = const_cast<char*>("/bin:/sbin");
+    if (!path) path = const_cast<char*>("/usr/bin:/usr/local/bin");
 
     Vector<String> paths = TRY(StringView { path }.split(":"));