# Creating a blockspecial file so i can create a filessytem on it
dd if=/dev/zero of=/tmp/initrd bs=1024 count=8000 

# Creating the actual filesystem
mke2fs /tmp/initrd 

# Mounting the created filesystem as loopback so i can put files in it
mount -o loop /tmp/initrd /mnt/initrd 

# Copying the valid files in to the new filesystem..but which files do i need here for it to work??
cp -a ~/initrd-template/* /mnt/initrd 

# Umounting the tempfilesystem
umount /mnt/initrd 

# Zipping the filesystem with higest compresslevel..Why do we wont to gzip it??
gzip -9 /tmp/initrd

#include <stdio.h>
#Include <unistd.h>
#include <linux/unistd.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <linux/reboot.h>

#define HALT reboot(LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, RB_HALT_SYSTEM, NULL)

int main(void)
{
    pid_t pid;
    int status;

    /* Or do this in advance be creating an empty directory as part of the filesystem */
    mkdir("/newroot", 0644);
    printf("Mounting root filesystem...\n");
    if(!(pid = fork()))
    {
        execl("/bin/mount", "/bin/mount", "-t", "nfs", "server:/pseudo-root", "/newroot", NULL);
        exit(127);
    }
    waitpid(pid, &status, 0);
    if(status)
    {
        printf("Help! Couldn't mount newroot!\n");
        HALT;
    }
    /* You must have an /initrd directory in the new root */
    if(pivot_root("/newroot", "/newroot/initrd"))
    {
        printf("Help! Couldn't pivot_root!\n");
        HALT;
    }
    chdir("/");
    execl("/sbin/init", "/sbin/init", NULL);
    perror("/sbin/init");
    HALT;
}