#!/usr/bin/env bash
 # Generate a minimal filesystem for CRUX/Linux and load it into the local
 # docker as "cruxlinux"
 # requires root and the crux iso (http://crux.nu)
 
 set -e
 
 die () {
     echo >&2 "$@"
     exit 1
 }
 
 [ "$#" -eq 1 ] || die "1 argument(s) required, $# provided. Usage: ./mkimage-crux.sh /path/to/iso"
 
 ISO=${1}
 

 ROOTFS=$(mktemp -d ${TMPDIR:-/var/tmp}/rootfs-crux-XXXXXXXXXX)
 CRUX=$(mktemp -d ${TMPDIR:-/var/tmp}/crux-XXXXXXXXXX)
 TMP=$(mktemp -d ${TMPDIR:-/var/tmp}/XXXXXXXXXX)

 
 VERSION=$(basename --suffix=.iso $ISO | sed 's/[^0-9.]*\([0-9.]*\).*/\1/')
 
 # Mount the ISO
 mount -o ro,loop $ISO $CRUX
 
 # Extract pkgutils
 tar -C $TMP -xf $CRUX/tools/pkgutils#*.pkg.tar.gz
 
 # Put pkgadd in the $PATH
 export PATH="$TMP/usr/bin:$PATH"
 
 # Install core packages
 mkdir -p $ROOTFS/var/lib/pkg
 touch $ROOTFS/var/lib/pkg/db
 for pkg in $CRUX/crux/core/*; do
     pkgadd -r $ROOTFS $pkg
 done
 
 # Remove agetty and inittab config
 if (grep agetty ${ROOTFS}/etc/inittab 2>&1 > /dev/null); then
     echo "Removing agetty from /etc/inittab ..."
     chroot ${ROOTFS} sed -i -e "/agetty/d" /etc/inittab
     chroot ${ROOTFS} sed -i -e "/shutdown/d" /etc/inittab
     chroot ${ROOTFS} sed -i -e "/^$/N;/^\n$/d" /etc/inittab
 fi
 
 # Remove kernel source
 rm -rf $ROOTFS/usr/src/*
 
 # udev doesn't work in containers, rebuild /dev
 DEV=$ROOTFS/dev
 rm -rf $DEV
 mkdir -p $DEV
 mknod -m 666 $DEV/null c 1 3
 mknod -m 666 $DEV/zero c 1 5
 mknod -m 666 $DEV/random c 1 8
 mknod -m 666 $DEV/urandom c 1 9
 mkdir -m 755 $DEV/pts
 mkdir -m 1777 $DEV/shm
 mknod -m 666 $DEV/tty c 5 0
 mknod -m 600 $DEV/console c 5 1
 mknod -m 666 $DEV/tty0 c 4 0
 mknod -m 666 $DEV/full c 1 7
 mknod -m 600 $DEV/initctl p
 mknod -m 666 $DEV/ptmx c 5 2
 
 IMAGE_ID=$(tar --numeric-owner -C $ROOTFS -c . | docker import - crux:$VERSION)
 docker tag $IMAGE_ID crux:latest
 docker run -i -t crux echo Success.
 
 # Cleanup
 umount $CRUX
 rm -rf $ROOTFS
 rm -rf $CRUX
 rm -rf $TMP