Edit: /usr/lib/update-notifier/cddistupgrader (619B)
#!/bin/sh
#
CDROM_MOUNT="$1"
for d in "$CDROM_MOUNT"/dists/*/main/dist-upgrader/binary-all/; do
if [ -d "$d" ]; then
UPGRADER_DIR="$d"
break
fi
done
TAR=$(basename "$UPGRADER_DIR"/*.tar.gz)
CODENAME=${TAR%.tar.gz}
# get a tempdir
TMPDIR=$(mktemp -t -d distupgrade.XXXXXX)
cd $TMPDIR
# extract the tar
tar xzf "$UPGRADER_DIR"/"$TAR"
# apply any patches needed before running the upgrade
for apatch in /usr/share/update-notifier/upgrader-patches/*.diff; do
if patch --dry-run < "$apatch"; then
patch < "$apatch"
fi
done
# run it
"$TMPDIR"/"$CODENAME" --cdrom "$CDROM_MOUNT"