[Bug 1547466] Re: grep switches into binary mode while processing a text file

[Stefan Bader]

The current version of grep was published on 2016-02-18 which could be around when sbuild broke for me. Did not notice immediately as I was working on something so I used the chroots directly (which works as there I have a UTF-8 setting there which sbuild deliberately drops).
I downgraded grep in my chroot to 2.22-1ubuntu2 and that causes the issue to go away. So it is definitely the new version of grep in my environment.

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Title:
  grep switches into binary mode while processing a text file

Status in grep package in Ubuntu:
  New

Bug description:
  I noticed this staring to happen in Xenial about two days ago. When
  running sbuild (or now the buildd, too), the build breaks when trying
  to compile a generated file. I traced the problem down to grep
  suddenly acting weird. When not having any language set (or a non-UTF8
  mode) it will start printing some lines of a source file and then
  suddenly end that by printing "Binary file ... matches".

  With the attached file, the difference can be observed (running
  Xenial):

  LANG=C grep -v xxx grant_table.h

  and

  LANG=C.UTF-8 grep -v xxx grant_table.h

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