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From "Aditya Acharya (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2921) HBase shell prompt is not configured when used as a subprocess
Date Mon, 16 Aug 2010 22:16:19 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2921?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12899135#action_12899135
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Aditya Acharya commented on HBASE-2921:
---------------------------------------

Yeah, good observation. It looks like lib/ruby/1.x/irb/init.rb  has this line:

@CONF[:PROMPT_MODE] = (STDIN.tty? ? :DEFAULT : :NULL)

which is the source of this issue.  I'll investigate using a pty with subprocess for my use
case.

> HBase shell prompt is not configured when used as a subprocess
> --------------------------------------------------------------
>
>                 Key: HBASE-2921
>                 URL: https://issues.apache.org/jira/browse/HBASE-2921
>             Project: HBase
>          Issue Type: Bug
>          Components: shell
>    Affects Versions: 0.89.20100621
>            Reporter: Aditya Acharya
>   Original Estimate: 1h
>  Remaining Estimate: 1h
>
> When you start the HBase shell from bash, you see the following prompt:
> hbase(main):001:0>
> And typing in "conf" as the command yields the following prompt-related information:
> conf.prompt_c="%N(%m):%03n:%i* "
> conf.prompt_i="%N(%m):%03n:%i> "
> conf.prompt_mode=:DEFAULT
> conf.prompt_n="%N(%m):%03n:%i> "
> conf.prompt_s="%N(%m):%03n:%i%l "
> On the other hand, opening the HBase shell as python subprocess yields an empty string
as the prompt string. Furthermore, sending it the "conf" command through a pipe yields the
following output:
> conf.prompt_c=nil
> conf.prompt_i=nil
> conf.prompt_mode=:NULL
> conf.prompt_n=nil
> conf.prompt_s=nil
> I think this is a bug in the HBase shell. I'm not sure where it occurs, but I have found
that it can be easily patched up by hard-coding the prompt information into bin/hirb.rb. This
seems like the most appropriate fix, as bin/hirb.rb already modifies the conf for the interpreter.

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