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From "Eric Yang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-7610) /etc/profile.d does not exist on Debian
Date Sat, 03 Sep 2011 02:07:09 GMT
/etc/profile.d does not exist on Debian
---------------------------------------

                 Key: HADOOP-7610
                 URL: https://issues.apache.org/jira/browse/HADOOP-7610
             Project: Hadoop Common
          Issue Type: Bug
          Components: scripts
    Affects Versions: 0.20.204.0, 0.23.0
         Environment: Java 6, Debian
            Reporter: Eric Yang
            Assignee: Eric Yang


As part of post installation script, there is a symlink created in /etc/profile.d/hadoop-env.sh
to source /etc/hadoop/hadoop-env.sh.  Therefore, users do not need to configure HADOOP_* environment.
 Unfortunately, /etc/profile.d only exists in Ubuntu.  [Section 9.9 of the Debian Policy|http://www.debian.org/doc/debian-policy/ch-opersys.html#s9.9]
states:

{quote}
A program must not depend on environment variables to get reasonable defaults. (That's because
these environment variables would have to be set in a system-wide configuration file like
/etc/profile, which is not supported by all shells.)

If a program usually depends on environment variables for its configuration, the program should
be changed to fall back to a reasonable default configuration if these environment variables
are not present. If this cannot be done easily (e.g., if the source code of a non-free program
is not available), the program must be replaced by a small "wrapper" shell script which sets
the environment variables if they are not already defined, and calls the original program.

Here is an example of a wrapper script for this purpose:

{noformat}
     #!/bin/sh
     BAR=${BAR:-/var/lib/fubar}
     export BAR
     exec /usr/lib/foo/foo "$@"
{noformat}

Furthermore, as /etc/profile is a configuration file of the base-files package, other packages
must not put any environment variables or other commands into that file.
{quote}

Hence the default environment setup should skip for Debian.


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