From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
Cc: | Peter Eisentraut <peter_e(at)gmx(dot)net>, pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: pg_controldata gobbledygook |
Date: | 2013-04-26 04:34:54 |
Message-ID: | 672.1366950894@sss.pgh.pa.us |
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Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> writes:
> Tom Lane wrote:
>> I think I've heard of scripts grepping the output of pg_controldata for
>> this that or the other. Any rewording of the labels would break that.
>> While I'm not opposed to improving the labels, I would vote against your
>> second, abbreviated scheme because it would make things ambiguous for
>> simple grep-based scripts.
> We could provide two alternative outputs, one for human consumption with
> the proposed format and something else that uses, say, shell assignment
> syntax. (I did propose this years ago and I might have an unfinished
> patch still lingering about somewhere.)
And a script would use that how? "pg_controldata --machine-friendly"
would fail outright on older versions. I think it's okay to ask script
writers to write
pg_controldata | grep -e 'old label|new label'
but not okay to ask them to deal with anything as complicated as trying
a switch to see if it works or not.
regards, tom lane
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