Toby Oxborrow 05f10294e6 Redirect "apt-get install -y" stdin to /dev/null ...

According to debian bug 728775 [1] apt-get by design will consume stdin
(even when not run interactively).

When the run-aio-build.sh script is used as part of a curl-pipe-bash
such as described in the quick start docs [2] apt-get will effectively
halt execution of the script after installing git. The next time the
script is run it will get past the step because git is now installed and
apt-get no longer consumes stdin. In addition to run-aio-build.sh,
bootstrap-aio.sh and bootstrap-ansible.sh call apt-get and so exhibit
the same behaviour when called by run-aio-build.sh when used as part of
a curl-pipe-bash.

In addition to apt-get install -y, apt-get purge -y exhibits the same
behaviour.

The result for the end user is they must run the command multiple times
to get it to work.

Using the bash method to close stdin (0<&- [3]) causes apt-get to print
out "E: Write error - write (14: Bad address)" and fail. The solution is
to explicitly set stdin to nothing, such as "echo '' | apt-get ..." or
"apt-get ... < /dev/null". The latter is chosen for its aesthetics.

yum install -y does not exhibit this behaviour and so does not require
its stdin redirected.

[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=728775
[2] http://docs.openstack.org/developer/openstack-ansible/developer-docs/quickstart-aio.html#running-an-aio-build-in-one-step
[3] http://www.tldp.org/LDP/abs/html/io-redirection.html

Change-Id: I57484590e257956e1d1bc8e10ce8a35207622672
Closes-Bug: 1504546

2015-10-09 21:42:56 +08:00

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