/usr/lib/update-notifier/apt-cdrom-check is in update-notifier-common 0.119ubuntu8.1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 | #!/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 - addon CD
# 4 - aptoncd media
# (if the returncodes change, make sure to update src/gdu.c)
#
mount_point="$1"
addon_dir="$mount_point/app-install/"
aptoncd_file="$mount_point/aptoncd.info"
# sanity checks
if [ -z "$mount_point" ]; then
exit 0
fi
if [ -f "$aptoncd_file" ]; then
exit 4
fi
if [ ! -d "$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 "$cdrom_id" ]; then
# something bad happened here, we return "not yet scanned" as
# fallback (because we are cheap)
return 1
fi
# we always return ADDON cd regardless if we know it already or not
# the rationale is that it easier for people this way and less
# confusing
if [ -d "$addon_dir" ] && [ -x /usr/bin/gnome-app-install ]; then
exit 3
fi
# [cdrom-id] -> cdrom-id
if grep -s -q "$cdrom_id" $apt_dir$apt_state_dir$apt_cdrom_list; then
# already in sources.list, ignore
exit 0
fi
# so this is a CD we don't know yet and it has packages. good!
# now check if it contains a signed dist-upgrader
for d in "$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
exit 2
fi
fi
done
# we got an ubuntu CD with packages
exit 1
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