init: Add a configurable service directory

.gitignore

@@ -5,6 +5,7 @@ initrd/boot/moon
 env-local.sh
 initrd/bin/**
 base/usr/**
+base/etc/skel/LICENSE
 .fakeroot
 kernel/config.cmake
 ports/out/

apps/edit.cpp

@@ -1,6 +1,8 @@
 #include <luna/String.h>
 #include <os/ArgumentParser.h>
 #include <os/File.h>
+#include <os/FileSystem.h>
+#include <os/Prompt.h>
 
 using os::File;
 
@@ -14,10 +16,20 @@ Result<int> luna_main(int argc, char** argv)
     parser.add_positional_argument(pathname, "path"_sv, true);
     parser.parse(argc, argv);
 
+    if (os::FileSystem::exists(pathname))
+    {
+        String prompt = TRY(String::format("File %s already exists. Overwrite?"_sv, pathname.chars()));
+        bool overwrite = os::conditional_prompt(prompt.chars(), os::DefaultNo);
+        if (!overwrite) return 0;
+    }
+
     auto file = TRY(File::open_or_create(pathname, File::WriteOnly));
 
     auto input = File::standard_input();
 
+    os::println("- Editing %s. Press Enter to start a new line, or Ctrl+D at the start of a line to save and exit. -",
+                pathname.chars());
+
     while (1)
     {
         String line = TRY(input->read_line());

apps/init.cpp

@@ -323,7 +323,7 @@ static void mount_shmfs()
     if (chmod("/dev/shm", 01777) < 0) exit(255);
 }
 
-Result<int> sysinit()
+Result<int> sysinit(StringView path)
 {
     if (getpid() != 1)
     {
@@ -358,7 +358,8 @@ Result<int> sysinit()
 
     TRY(os::Security::pledge("stdio rpath wpath cpath proc exec id", nullptr));
 
-    start_services("/etc/init");
+    if (path.is_empty()) path = "/etc/init";
+    start_services(path);
 
     while (1)
     {
@@ -394,7 +395,7 @@ Result<int> sysinit()
     }
 }
 
-Result<int> user_init()
+Result<int> user_init(StringView path)
 {
     setpgid(0, 0);
 
@@ -405,7 +406,8 @@ Result<int> user_init()
 
     TRY(os::Security::pledge("stdio rpath wpath cpath proc exec", nullptr));
 
-    start_services("/etc/user");
+    if (path.is_empty()) path = "/etc/user";
+    start_services(path);
 
     TRY(os::Security::pledge("stdio rpath wpath proc exec", nullptr));
 
@@ -446,13 +448,16 @@ Result<int> user_init()
 Result<int> luna_main(int argc, char** argv)
 {
     bool user;
+    StringView service_path;
 
     os::ArgumentParser parser;
     parser.add_description("The init system for Luna.");
     parser.add_system_program_info("init"_sv);
     parser.add_switch_argument(user, 'u', "user"_sv, "initialize a user session instead of the system");
+    parser.add_value_argument(service_path, 's', "service-path"_sv,
+                              "change the default service path (/etc/init or /etc/user)");
     parser.parse(argc, argv);
 
-    if (user) return user_init();
-    return sysinit();
+    if (user) return user_init(service_path);
+    return sysinit(service_path);
 }

base/etc/skel/welcome

@@ -0,0 +1,14 @@
+Welcome to the Luna operating system!
+You are running on the default user account, selene.
+
+If you are familiar with Unix-style operating systems (like Linux or *BSD), you should be able to use the Luna terminal without much problems.
+
+Following the traditional Unix filesystem structure, programs are installed in /usr/bin (/bin is a symlink to /usr/bin). The command `ls /bin` will show all commands available on your current Luna installation.
+
+Currently, because of driver limitations, the root file system is mounted read-only. Your home folder is writable, but volatile; it is created and populated on boot, and its contents will vanish after a reboot.
+
+The system is booted using the 'init' program. You can read its configuration files in the /etc/init directory to learn more about the boot process.
+
+Luna is free software, released under the BSD-2-Clause license. The license is included in the LICENSE file in your home directory.
+
+View the source code and read more about Luna at https://git.cloudapio.eu/apio/Luna.

base/etc/startup/mount-home.sh

@@ -1,3 +1,6 @@
 #!/bin/sh
+# Create and populate a volatile home directory.
 mount -t tmpfs tmpfs /home/selene
 chown selene:selene /home/selene
+cp /etc/skel/welcome /home/selene/
+cp /etc/skel/LICENSE /home/selene/

tools/install.sh

@@ -31,3 +31,5 @@ mkdir -p base/tmp
 
 rm -f base/bin
 ln -s usr/bin base/bin
+
+cp $LUNA_ROOT/LICENSE base/etc/skel/LICENSE