[Backport 6.1] File lock on CURL downloads #3808
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* Try to use filelock for downloads We want to avoid race conditions on gmt_data_server.txt and gmt_hash_server.txt. * Update gmt_remote.c * Delete a failing gmt_data_server.txt file so it can be regenerated If for whatever reason the gmt_data_server.txt ends up blank, reading will fail. Rather than just complain about it, we now delete the file since we (a) know it is broken and (b) unless it is removed we will not attempt to refresh it for another cycle (by default 24 hours).
Since the URL of a quiery is not a good file name, we do not create an advisory lock file for such downloads. Addresses #3765 hopefully.
Hopefully fixes #3765.
Now both places where lockfiles are used avoids URL queries. Closes #3765.
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I should be more careful adding the label BUG when it is one - like clobbering the gmt_data_server.txt really is. |
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Backport #3735, #3768, #3780, #3785, and #3804.