<jarnos> rbasak, well, that bug has not got any visible attention from
others, so I don't know who I am discussing it with.

<jarnos> rbasak, no-one should rely on behavior that makes output
ambiguous. The bug is fixed in 16.04 anyway.

<rbasak> jarnos: I don't think it matters where users "should" rely on
behaviour or not. For a stable release, what matters is if they *are*,
and if an SRU will break them.

<jarnos> rbasak, their scripts are broken anyway.

<rbasak> jarnos: it doesn't matter. If their scripts happen to work now,
and we change behaviour in an SRU such that they break, then that needs
to be considered.

<rbasak> jarnos: unless you can demonstrate that it isn't possible to
write a script that would change behaviour after your proposed update?

<rbasak> jarnos: you'd be discussing the issue with me in the bug, but
also leaving a record of the discussion so that if another member of the
SRU team considers the bug, that person can see the previous discussion.

<rbasak> jarnos: presumably you need the fix for some reason. But there
are other ways to find a workaround that don't involve changing
behaviour but might be useful to affected users. For example, a flag in
the environment. These should be discussed, but I feel you first need to
understand my point about not breaking users despite their scripts
"being broken".

<rbasak> You can't dismiss users like that.

<rbasak> Just because they're wrong doesn't mean we can break them in a
stable release.

<jarnos> rbasak, how would a flag in environment help?

<jarnos> rbasak, fixing the bug would make it possible for them to fix
their scripts.

<rbasak> jarnos: you could land an SRU that doesn't change behaviour,
except when you want it to do so.

<rbasak> jarnos: 16.04 makes it possible for them to fix their scripts.

<rbasak> jarnos: and an environment flag would also do this for 14.04,
but without breaking users surprisingly.

<jarnos> rbasak, not, if you want to make a script that works in both.

<rbasak> jarnos: if you want a script that works in both, SRU my
environment flag proposal, then set the environment in your script.
You'll then get consistent behaviour in both. I'm not saying it has to
be this way, but it is an option that minimises regression risk to
existing users.

<jarnos> rbasak,  What is your environment flag proposal?

<rbasak> jarnos: SRU the fix to 14.04, but adjust it so that it
maintains previous broken behaviour unless the environment variable
FIX_LP_1621226 is set.

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https://bugs.launchpad.net/bugs/1621226

Title:
  grep does not output null when -o -z is used

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