In some tests, the code manually searches for a log message, and it
uses tail -1 with a delay of 1 second, which can miss the expected line.
Also, because the aof tests use start_server_aof and not start_server,
the test name doesn't log into the server log.
To fix the above, I made the following changes:
- Change the start_server_aof to wrap the start_server.
This will add the created aof server to the servers list, and make
srv() and wait_for_log_messages() available for the tests.
- Introduce a new option for start_server.
'wait_ready' - an option to let the caller start the test code without
waiting for the server to be ready. useful for tests on a server that
is expected to exit on startup.
- Create a new start_server_aof_ex.
The new proc also accept options as argument and make use of the
new 'short_life' option for tests that are expected to exit on startup
because of some error in the aof file(s).
Because of the above, I had to change many lines and replace every
local srv variable (a server config) usage with the srv().
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