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Re: [PATCH v4 4/7] keyval: Parse help options
From: |
Kevin Wolf |
Subject: |
Re: [PATCH v4 4/7] keyval: Parse help options |
Date: |
Mon, 12 Oct 2020 16:35:01 +0200 |
Am 11.10.2020 um 09:35 hat Markus Armbruster geschrieben:
> From: Kevin Wolf <kwolf@redhat.com>
>
> This adds a special meaning for 'help' and '?' as options to the keyval
> parser. Instead of being an error (because of a missing value) or a
> value for an implied key, they now request help, which is a new boolean
> output of the parser in addition to the QDict.
>
> A new parameter 'p_help' is added to keyval_parse() that contains on
> return whether help was requested. If NULL is passed, requesting help
> results in an error and all other cases work like before.
>
> Turning previous error cases into help is a compatible extension. The
> behaviour potentially changes for implied keys: They could previously
> get 'help' as their value, which is now interpreted as requesting help.
>
> This is not a problem in practice because 'help' and '?' are not a valid
> values for the implied key of any option parsed with keyval_parse():
>
> * audiodev: union Audiodev, implied key "driver" is enum AudiodevDriver,
> "help" and "?" are not among its values
>
> * display: union DisplayOptions, implied key "type" is enum
> DisplayType, "help" and "?" are not among its values
>
> * blockdev: union BlockdevOptions, implied key "driver is enum
> BlockdevDriver, "help" and "?" are not among its values
>
> * export: union BlockExport, implied key "type" is enum BlockExportType,
> "help" and "?" are not among its values
>
> * monitor: struct MonitorOptions, implied key "mode" is enum MonitorMode,
> "help" and "?" are not among its values
>
> * nbd-server: struct NbdServerOptions, no implied key.
>
> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
> Signed-off-by: Markus Armbruster <armbru@redhat.com>
> diff --git a/tests/test-keyval.c b/tests/test-keyval.c
> index 04c62cf045..7b459900af 100644
> --- a/tests/test-keyval.c
> +++ b/tests/test-keyval.c
> @@ -1,3 +1,4 @@
> +
> /*
> * Unit tests for parsing of KEY=VALUE,... strings
> *
This hunk looks unintentional.
Kevin
- [PATCH v4 5/7] qom: Factor out helpers from user_creatable_print_help(), (continued)
- [PATCH v4 5/7] qom: Factor out helpers from user_creatable_print_help(), Markus Armbruster, 2020/10/11
- [PATCH v4 1/7] keyval: Fix and clarify grammar, Markus Armbruster, 2020/10/11
- [PATCH v4 3/7] keyval: Fix parsing of ',' in value of implied key, Markus Armbruster, 2020/10/11
- [PATCH v4 7/7] qemu-storage-daemon: Remove QemuOpts from --object parser, Markus Armbruster, 2020/10/11
- [PATCH v4 4/7] keyval: Parse help options, Markus Armbruster, 2020/10/11
- Re: [PATCH v4 0/7] qemu-storage-daemon: Remove QemuOpts from --object, Kevin Wolf, 2020/10/12