Re: [PATCH 23/23] qemu-img: inline list of supported commands, remove qemu-img-cmds.h include

["Daniel P. Berrangé" <berrange@redhat.com>]

On Sat, Feb 10, 2024 at 12:22:44AM +0300, Michael Tokarev wrote:
> also add short description to each command and use it in --help
> 
> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
> ---
>  qemu-img.c | 42 +++++++++++++++++++++++++++++++++++-------
>  1 file changed, 35 insertions(+), 7 deletions(-)
> 
> diff --git a/qemu-img.c b/qemu-img.c
> index d9c5c6078b..e57076738e 100644
> --- a/qemu-img.c
> +++ b/qemu-img.c
> @@ -61,6 +61,7 @@
>  typedef struct img_cmd_t {
>      const char *name;
>      int (*handler)(const struct img_cmd_t *ccmd, int argc, char **argv);
> +    const char *description;
>  } img_cmd_t;
>  
>  enum {
> @@ -130,11 +131,12 @@ static G_NORETURN
>  void cmd_help(const img_cmd_t *ccmd,
>                const char *syntax, const char *arguments)
>  {
> -    printf("qemu-img %s %s"
> +    printf("qemu-img %s: %s.  Usage:\n"
> +           "qemu-img %s %s"

This ends up looking a bit muddled together. I don't think we
need repeat 'qemu-img <cmd>' twice, and could add a little
more whitespace

eg instead of:

$ ./build/qemu-img check --help
qemu-img check: Check basic image integrity.  Usage:
qemu-img check [-f FMT | --image-opts] [-T CACHE_MODE] [-r] [-u]
        [--output human|json] [--object OBJDEF] FILENAME
Arguments:
...snip...

have it look like

$ ./build/qemu-img check --help
Check basic image integrity.

Usage:

  qemu-img check [-f FMT | --image-opts] [-T CACHE_MODE] [-r] [-u]
        [--output human|json] [--object OBJDEF] FILENAME

Arguments:
...snip...


>             "Arguments:\n"
>             " -h|--help - print this help and exit\n"
>             "%s",
> -           ccmd->name, syntax, arguments);
> +           ccmd->name, ccmd->description, ccmd->name, syntax, arguments);
>      exit(EXIT_SUCCESS);
>  }
>  
> @@ -5746,10 +5748,36 @@ out:
>  }
>  
>  static const img_cmd_t img_cmds[] = {
> -#define DEF(option, callback, arg_string)        \
> -    { option, callback },
> -#include "qemu-img-cmds.h"
> -#undef DEF
> +    { "amend", img_amend,
> +      "Update format-specific options of the image" },
> +    { "bench", img_bench,
> +      "Run simple image benchmark" },
> +    { "bitmap", img_bitmap,
> +      "Perform modifications of the persistent bitmap in the image" },
> +    { "check", img_check,
> +      "Check basic image integrity" },
> +    { "commit", img_commit,
> +      "Commit image to its backing file" },
> +    { "compare", img_compare,
> +      "Check if two images have the same contents" },
> +    { "convert", img_convert,
> +      "Copy one image to another with optional format conversion" },
> +    { "create", img_create,
> +      "Create and format new image file" },
> +    { "dd", img_dd,
> +      "Copy input to output with optional format conversion" },
> +    { "info", img_info,
> +      "Display information about image" },
> +    { "map", img_map,
> +      "Dump image metadata" },
> +    { "measure", img_measure,
> +      "Calculate file size requred for a new image" },
> +    { "rebase", img_rebase,
> +      "Change backing file of the image" },
> +    { "resize", img_resize,
> +      "Resize the image to the new size" },
> +    { "snapshot", img_snapshot,
> +      "List or manipulate snapshots within image" },
>      { NULL, NULL, },
>  };
>  
> @@ -5813,7 +5841,7 @@ QEMU_IMG_VERSION
>  "   [[enable=]<pattern>][,events=<file>][,file=<file>]\n"
>  "Recognized commands (run qemu-img command --help for command-specific help):\n");
>              for (cmd = img_cmds; cmd->name != NULL; cmd++) {
> -                printf("  %s\n", cmd->name);
> +                printf("  %s - %s\n", cmd->name, cmd->description);
>              }
>              c = printf("Supported image formats:");
>              bdrv_iterate_format(format_print, &c, false);
> -- 
> 2.39.2
> 
> 

With regards,
Daniel
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