#!/bin/sh
#
# helper to check if we actually have an ubuntu CD
#
# Returncode:
# 0 - no ubuntu CD
# 1 - CD with packages
# 2 - dist-upgrader CD
# 3 - aptoncd media
# (if the returncodes change, make sure to update src/cdroms.c)
#

mount_point="$1"
aptoncd_file="$mount_point/aptoncd.info"

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

if [ -f "$aptoncd_file" ]; then
exit 3
fi

if [ ! -d "$mount_point/ubuntu" ] && [ ! -f "$mount_point/cdromupgrade" ]; 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.gz" | grep -q -v debian-installer

# 1 means "no lines were 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 "Identifying... [dasjflkd]" -> "dasjflkd"
line=${line%]*}
cdrom_id=${line#*\[}

if [ -z "$cdrom_id" ]; then
# something bad happened 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

# so this is a CD we don't know yet and it has packages. good!
THIS_VERSION=$(lsb_release -sr)
VERSION_ON_MEDIA=$(awk {'print $2'} "$mount_point/.disk/info")

# now check if it contains a signed dist-upgrader
for d in "$mount_point"/dists/*/main/dist-upgrader/binary-all/; do
if [ -d "$d" ]; then
# ok, we have one, now check the authentication
GPG="gpgv --ignore-time-conflict --keyring /etc/apt/trusted.gpg"
if $GPG "$d/"*.tar.gz.gpg "$d"/*.tar.gz; then
# verified ok, we have a valid upgrader, if it was not ok, the
# fallback to the end is ok because we still have packages on it
if dpkg --compare-versions "$THIS_VERSION" lt "$VERSION_ON_MEDIA"; then
exit 2
fi
fi
fi
done

# we got an ubuntu CD with packages
if dpkg --compare-versions "$THIS_VERSION" lt "$VERSION_ON_MEDIA"; then
exit 1
fi