Fix makedev package on Ubuntu 14.04 for Joyent SmartOS LX zones

gistfile1.txt

Unfortunately the Ubuntu makedev package fails to detect it's in a container environment on SmartOS LX zones, resulting in errors of the form:

# apt-get install nano
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
  nano
0 upgraded, 1 newly installed, 0 to remove and 141 not upgraded.
1 not fully installed or removed.
Need to get 194 kB of archives.
After this operation, 614 kB of additional disk space will be used.
Get:1 http://archive.ubuntu.com/ubuntu/ trusty/main nano amd64 2.2.6-1ubuntu1 [194 kB]
Fetched 194 kB in 0s (2,963 kB/s)
Selecting previously unselected package nano.
(Reading database ... 74430 files and directories currently installed.)
Preparing to unpack .../nano_2.2.6-1ubuntu1_amd64.deb ...
Unpacking nano (2.2.6-1ubuntu1) ...
Processing triggers for man-db (2.6.7.1-1ubuntu1) ...
Setting up makedev (2.3.1-93ubuntu2~ubuntu14.04.1) ...
mknod: ‘mem-’: Operation not permitted
makedev mem c 1 1 root kmem 0640: failed
mknod: ‘kmem-’: Operation not permitted
makedev kmem c 1 2 root kmem 0640: failed
mknod: ‘null-’: Operation not permitted
makedev null c 1 3 root root 0666: failed
...

To fix this, we can make a customised makedev package with an empty postinst script.

# Make custom makedev package
mkdir -p /root/makedev
cd /root/makedev
apt-get download makedev
dpkg-deb -x makedev*.deb
dpkg-deb -e makedev*.deb
rm *.deb
echo -en '#!/bin/bash\nexit 0\n' > DEBIAN/postinst
dpkg-deb -b . ../makedev.deb
rm -rf /root/makedev

# Replace existing makedev package
dpkg -r --force-depends makedev
dpkg -i /root/makedev.deb

# Pin makedev so our version doesn't get replaced
cat << MAKEDEV > $INSTALL_DIR/etc/apt/preferences.d/makedev
Package: makedev
Pin: release *
Pin-Priority: -1
MAKEDEV