init: Add a Message of the Day

apps/src/init.c

@@ -1,8 +1,35 @@
+#include <errno.h>
 #include <luna.h>
 #include <stdio.h>
 #include <sys/wait.h>
 #include <unistd.h>
 
+void show_motd()
+{
+    FILE* fp = fopen("/etc/motd", "r");
+    if (!fp)
+    {
+        if (errno != ENOENT) { perror("fopen"); }
+        return;
+    }
+
+    char buf[4096];
+    size_t nread = fread(buf, sizeof(buf) - 1, 1, fp);
+    if (ferror(fp))
+    {
+        perror("fread");
+        fclose(fp);
+        return;
+    }
+    buf[nread] = 0;
+
+    puts(buf);
+
+    fclose(fp);
+
+    putchar('\n');
+}
+
 int main()
 {
     if (getpid() != 1)
@@ -11,7 +38,7 @@ int main()
         return 1;
     }
 
-    printf("Welcome to Luna!\n\n");
+    show_motd();
 
     msleep(200);
 

initrd/etc/motd

@@ -0,0 +1,3 @@
+Welcome to Luna!
+
+Tip of the day: Type 'help' to get started!