init: Read and launch service files in order using sort()

apps/init.cpp

@@ -1,6 +1,7 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <luna/PathParser.h>
+#include <luna/Sort.h>
 #include <luna/String.h>
 #include <luna/Vector.h>
 #include <os/Directory.h>
@@ -239,6 +240,7 @@ static Result<void> load_services()
     auto dir = TRY(os::Directory::open("/etc/init"));
 
     auto services = TRY(dir->list(os::Directory::Filter::ParentAndBase));
+    sort(services.begin(), services.end(), String::compare);
 
     for (const auto& entry : services)
     {

initrd/etc/init/00-motd

@@ -0,0 +1,3 @@
+Name=motd
+Command=/bin/cat /etc/motd
+Wait=true

initrd/etc/motd

@@ -1 +1,2 @@
-Hello, world!
+Welcome to the Luna system!
+Have a look around, you can run 'ls /bin' to list available commands.

libluna/include/luna/String.h

@@ -65,6 +65,8 @@ class String
     static Result<String> from_cstring(const char* str);
     static Result<String> from_string_view(StringView str);
 
+    static int compare(const String* a, const String* b);
+
     const char* chars() const
     {
         return m_inline ? m_inline_storage : m_string;

libluna/src/String.cpp

@@ -180,3 +180,8 @@ Result<String> String::join(const Vector<String>& vec, StringView delim)
 
     return sb.string();
 }
+
+int String::compare(const String* a, const String* b)
+{
+    return strcmp(a->chars(), b->chars());
+}