Binbin bfbb15f75d
redis-server command line arguments support take one bulk string with spaces for MULTI_ARG configs parsing. And allow options value to use the -- prefix (#10660)
## Take one bulk string with spaces for MULTI_ARG configs parsing
Currently redis-server looks for arguments that start with `--`,
and anything in between them is considered arguments for the config.
like: `src/redis-server --shutdown-on-sigint nosave force now --port 6380`

MULTI_ARG configs behave differently for CONFIG command, vs the command
line argument for redis-server.
i.e. CONFIG command takes one bulk string with spaces in it, while the
command line takes an argv array with multiple values.

In this PR, in config.c, if `argc > 1` we can take them as is,
and if the config is a `MULTI_ARG` and `argc == 1`, we will split it by spaces.

So both of these will be the same:
```
redis-server --shutdown-on-sigint nosave force now --shutdown-on-sigterm nosave force
redis-server --shutdown-on-sigint nosave "force now" --shutdown-on-sigterm nosave force
redis-server --shutdown-on-sigint nosave "force now" --shutdown-on-sigterm "nosave force"
```

## Allow options value to use the `--` prefix
Currently it decides to switch to the next config, as soon as it sees `--`, 
even if there was not a single value provided yet to the last config,
this makes it impossible to define a config value that has `--` prefix in it.

For instance, if we want to set the logfile to `--my--log--file`,
like `redis-server --logfile --my--log--file --loglevel verbose`,
current code will handle that incorrectly.

In this PR, now we allow a config value that has `--` prefix in it.
**But note that** something like `redis-server --some-config --config-value1 --config-value2 --loglevel debug`
would not work, because if you want to pass a value to a config starting with `--`, it can only be a single value.
like: `redis-server --some-config "--config-value1 --config-value2" --loglevel debug`

An example (using `--` prefix config value):
```
redis-server --logfile --my--log--file --loglevel verbose
redis-cli config get logfile loglevel
1) "loglevel"
2) "verbose"
3) "logfile"
4) "--my--log--file"
```

### Potentially breaking change
`redis-server --save --loglevel verbose` used to work the same as `redis-server --save "" --loglevel verbose`
now, it'll error!
2022-05-11 11:33:35 +03:00
..

Redis Test Suite

The normal execution mode of the test suite involves starting and manipulating local redis-server instances, inspecting process state, log files, etc.

The test suite also supports execution against an external server, which is enabled using the --host and --port parameters. When executing against an external server, tests tagged external:skip are skipped.

There are additional runtime options that can further adjust the test suite to match different external server configurations:

Option Impact
--singledb Only use database 0, don't assume others are supported.
--ignore-encoding Skip all checks for specific encoding.
--ignore-digest Skip key value digest validations.
--cluster-mode Run in strict Redis Cluster compatibility mode.
--large-memory Enables tests that consume more than 100mb

Tags

Tags are applied to tests to classify them according to the subsystem they test, but also to indicate compatibility with different run modes and required capabilities.

Tags can be applied in different context levels:

  • start_server context
  • tags context that bundles several tests together
  • A single test context.

The following compatibility and capability tags are currently used:

Tag Indicates
external:skip Not compatible with external servers.
cluster:skip Not compatible with --cluster-mode.
large-memory Test that requires more than 100mb
tls:skip Not campatible with --tls.
needs:repl Uses replication and needs to be able to SYNC from server.
needs:debug Uses the DEBUG command or other debugging focused commands (like OBJECT).
needs:pfdebug Uses the PFDEBUG command.
needs:config-maxmemory Uses CONFIG SET to manipulate memory limit, eviction policies, etc.
needs:config-resetstat Uses CONFIG RESETSTAT to reset statistics.
needs:reset Uses RESET to reset client connections.
needs:save Uses SAVE to create an RDB file.

When using an external server (--host and --port), filtering using the external:skip tags is done automatically.

When using --cluster-mode, filtering using the cluster:skip tag is done automatically.

When not using --large-memory, filtering using the largemem:skip tag is done automatically.

In addition, it is possible to specify additional configuration. For example, to run tests on a server that does not permit SYNC use:

./runtest --host <host> --port <port> --tags -needs:repl