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hmp: Allow for error message hints on HMP

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Commits 7216ae3d and d2828429 disabled some error message hints,
all because a change to use modern error reporting meant that the
hint would be output prior to the actual error.  Fix this by making
hints a first-class member of Error.

For example, we are now back to the pleasant:

 $ qemu-system-x86_64 --nodefaults -S --vnc :0 --chardev null,id=,
 qemu-system-x86_64: --chardev null,id=,: Parameter 'id' expects an identifier
 Identifiers consist of letters, digits, '-', '.', '_', starting with a letter.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <1441901956-21991-1-git-send-email-eblake@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
This commit is contained in:
Eric Blake 2015-09-10 10:19:16 -06:00 • committed by Markus Armbruster
parent 615cf669b5
commit 50b7b000c9
4 changed files with 57 additions and 35 deletions
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11
util/qemu-option.c
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@ -205,10 +205,8 @@ void parse_option_size(const char *name, const char *value,
break;
default:
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, name, "a size");
#if 0 /* conversion from qerror_report() to error_set() broke this: */
error_printf_unless_qmp("You may use k, M, G or T suffixes for "
"kilobytes, megabytes, gigabytes and terabytes.\n");
#endif
error_append_hint(errp, "You may use k, M, G or T suffixes for "
"kilobytes, megabytes, gigabytes and terabytes.");
return;
}
} else {
@ -648,9 +646,8 @@ QemuOpts *qemu_opts_create(QemuOptsList *list, const char *id,
if (!id_wellformed(id)) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "id",
"an identifier");
#if 0 /* conversion from qerror_report() to error_set() broke this: */
error_printf_unless_qmp("Identifiers consist of letters, digits, '-', '.', '_', starting with a letter.\n");
#endif
error_append_hint(errp, "Identifiers consist of letters, digits, "
"'-', '.', '_', starting with a letter.");
return NULL;
}
opts = qemu_opts_find(list, id);