Re: [PULL 2/6] qemu_img: add cvtnum_full to print error reports

[Eric Blake <eblake@redhat.com>]

On 5/18/20 11:32 AM, Eric Blake wrote:
> From: Eyal Moscovici <eyal.moscovici@oracle.com>
> 
> All calls to cvtnum check the return value and print the same error
> message more or less. And so error reporting moved to cvtnum_full to
> reduce code duplication and provide a single error
> message. Additionally, cvtnum now wraps cvtnum_full with the existing
> default range of 0 to MAX_INT64.
> 
> Acked-by: Mark Kanda <mark.kanda@oracle.com>
> Signed-off-by: Eyal Moscovici <eyal.moscovici@oracle.com>
> Message-Id: <20200513133629.18508-2-eyal.moscovici@oracle.com>
> Reviewed-by: Eric Blake <eblake@redhat.com>
> [eblake: fix printf formatting, avoid trailing space, change error wording,
> reformat commit message]
> Signed-off-by: Eric Blake <eblake@redhat.com>
> ---

> @@ -572,16 +584,8 @@ static int img_create(int argc, char **argv)
>       if (optind < argc) {
>           int64_t sval;
> 
> -        sval = cvtnum(argv[optind++]);
> +        sval = cvtnum("image size", argv[optind++]);
>           if (sval < 0) {
> -            if (sval == -ERANGE) {
> -                error_report("Image size must be less than 8 EiB!");

This change broke iotest 178:

--- /home/eblake/qemu/tests/qemu-iotests/178.out.qcow2	2020-05-20 
16:33:20.065710365 -0500
+++ /home/eblake/qemu/build/tests/qemu-iotests/178.out.bad	2020-05-20 
16:35:28.924512423 -0500
@@ -13,7 +13,7 @@
  qemu-img: Invalid parameter 'snapshot.foo'
  qemu-img: Failed in parsing snapshot param 'snapshot.foo'
  qemu-img: --output must be used with human or json as argument.
-qemu-img: Image size must be less than 8 EiB!
+qemu-img: Invalid image size specified. Must be between 0 and 
9223372036854775807.
  qemu-img: Unknown file format 'foo'

  == Size calculation for a new file (human) ==

I'll post a followup patch shortly.

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org