[Bug 1261880] Re: apt-get flushes read buffer

[Manuel]

It appears the problem occurs after fetching the deb-files:

root at app:~# cat script.sh
apt-get install -yq mysql-server
echo "more stuff"
echo "more stuff"
echo "more stuff"
echo "more stuff"
echo "more stuff"
echo "more stuff"
echo "more stuff"
echo "more stuff"

root at app:~# cat script.sh | bash
Reading package lists...
Building dependency tree...
Reading state information...
The following extra packages will be installed:
  *snip*
Suggested packages:
  *snip*
The following NEW packages will be installed:
  l*snip*
0 upgraded, 12 newly installed, 0 to remove and 0 not upgraded.
Need to get 9,026 kB of archives.
After this operation, 96.5 MB of additional disk space will be used.
Get:1 http://mirrors.digitalocean.com/ubuntu/ trusty/main libaio1 amd64 0.3.109-4 [6,364 B]
*snip*
Get:12 http://mirrors.digitalocean.com/ubuntu/ trusty-updates/main mysql-server all 5.5.37-0ubuntu0.14.04.1 [12.5 kB]
Fetched 9,026 kB in 0s (26.4 MB/s)
Preconfiguring packages ...
echo "more stuff"
echo "more stuff"
echo "more stuff"
echo "more stuff"
echo "more stuff"
echo "more stuff"
echo "more stuff"
echo "more stuff"
Selecting previously unselected package libaio1:amd64.
(Reading database ... 60805 files and directories currently installed.)
Preparing to unpack .../libaio1_0.3.109-4_amd64.deb ...
Unpacking libaio1:amd64 (0.3.109-4) ...
Selecting previously unselected package mysql-common.
Preparing to unpack .../mysql-common_5.5.37-0ubuntu0.14.04.1_all.deb ...
*snip*

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https://bugs.launchpad.net/bugs/1261880

Title:
  apt-get flushes read buffer

Status in “apt” package in Ubuntu:
  Confirmed

Bug description:
  Have a script that installs all the additional programs (chromium-
  browser, glabel, gimp,,,, etc) after installing the base 14.04 system.
  Have used this same script for many relase of Ubuntu.  When I run it
  now it appears that the first call to apt-get will purge the read
  buffer on the script.  Example of the script

  while read cmdtodo prodtoinst
    do
      apt-get -y $cmdtodo $prodtoinst
  done < $infile

  The infile contains a list of commands and products

  remove rythmbox
  install glabel
  install gimp
  install gnucash

  What I see at the terminal after calling the user install script is
  the output of apt-get remove rythmbox and then the rest of the lines
  in the infile (the "install glabel"  "install gimp" etc get outputed
  to the terminal before the completion of the apt-get remove command.
  The installs stop.

  If the user command is immediately re-run the first product fails
  because it is either installed or uninstalled and the next product is
  picked up and run.  Again during the run the infile buffer is flushed
  to the terminal and the installs stop.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: apt 0.9.14.1ubuntu1
  ProcVersionSignature: Ubuntu 3.12.0-7.15-generic 3.12.4
  Uname: Linux 3.12.0-7-generic x86_64
  ApportVersion: 2.12.7-0ubuntu2
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Tue Dec 17 14:36:52 2013
  InstallationDate: Installed on 2013-12-17 (0 days ago)
  InstallationMedia: Ubuntu-GNOME 14.04 "Trusty Tahr" - Alpha amd64 (20131217)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: apt
  UpgradeStatus: No upgrade log present (probably fresh install)

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