#!/bin/sh


mount_point="$1"

# sanity checks
if [ -z "$mount_point" ]; then
    exit 0
fi

if [ ! -d "$mount_point/ubuntu" ]; then
    exit 0
fi

# check if there are "Packages" files on the cd (and ignore the 
# debian-installer dir)
find "$mount_point/dists/"  -name Packages|grep -q -v debian-installer

# 1 means "no lines where selected" in grep (no Packages file but the 
# debian-installer ones)
if [ $? -eq 1 ]; then
    exit 0
fi

# get some apt-config vars
label_start=0
cdrom_id=""

apt_dir="/"
apt_state_dir="var/lib/apt/"
apt_cdrom_list="cdrom.list"
eval $(apt-config shell apt_dir Dir \
                        apt_state_dir Dir::State \
                        apt_cdrom_list Dir::State::cdroms)



# identifying ... [afkdsjaf] line
line=$(apt-cdrom -d="$1" -m ident|grep "\[.*\]")

# remove the stuff before "Identifiyng... [dasjflkd]" -> "dasjflkd"
line=${line%]*}
cdrom_id=${line#*[}

if [ -z "$cdrom_id" ]; then
    # something bad happend here, we return "not yet scanned" as 
    # fallback (because we are cheap)
    return 1
fi

# [cdrom-id] -> cdrom-id  
if grep -s -q "$cdrom_id"  $apt_dir$apt_state_dir$apt_cdrom_list; then
    # already in sources.list, ignore
    exit 0
fi

# not found, return true
exit 1