[HACKERS] ALTER SYSTEM vs symlink

[Andrew Dunstan]

I don't know if this was discussed at the time ALTER SYSTEM was 
implemented, but I have just discovered that if postgresql.auto.conf is 
a symlink to a file elsewhere, ALTER SYSTEM will happily break that link 
and write its own local copy. That strikes me as rather unfriendly. Why 
not just truncate the file rather than unlink it as it's being 
rewritten? Even if we don't want to do that a warning in the docs might 
help users avoid the "mistake" I just made.

cheers
andrew


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