On 06/24/2015 09:43 AM, Michael Paquier wrote:
Attached is a new set of patches. Except for the last ones that addresses one issue of pg_rewind (symlink management when streaming PGDATA), all the others introduce if_not_exists options for the functions of genfile.c. The pg_rewind stuff could be more polished though. Feel free to comment.
I've committed the additional option to the functions in genfile.c (I renamed it to "missing_ok", for clarity), and the pg_rewind changes to use that option.
I ended up refactoring the patch quite a bit, so if you could double-check what I committed to make sure I didn't break anything, that would be great.
I didn't commit the tablespace or symlink handling changes yet, will review those separately.
I also didn't commit the new regression test yet. It would indeed be nice to have one, but I think it was a few bricks shy of a load. It should work in a freshly initdb'd system, but not necessarily on an existing installation. First, it relied on the fact that postgresql.conf.auto exists, but a DBA might remove that if he wants to make sure the feature is not used. Secondly, it relied on the fact that pg_twophase is empty, but there is no guarantee of that either. Third, the error messages included in the expected output, e.g "No such file or directory", depend on the operating system and locale. And finally, it'd be nice to test more things, in particular the behaviour of different offsets and lengths to pg_read_binary_file(), although an incomplete test would be better than no test at all.
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