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qom: -object error messages lost location, restore it

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qemu_opts_foreach() runs its callback with the error location set to
the option's location.  Any errors the callback reports use the
option's location automatically.

Commit 90998d5 moved the actual error reporting from "inside"
qemu_opts_foreach() to after it.  Here's a typical hunk:

	 if (qemu_opts_foreach(qemu_find_opts("object"),
    -                          object_create,
    -                          object_create_initial, NULL)) {
    +                          user_creatable_add_opts_foreach,
    +                          object_create_initial, &err)) {
    +        error_report_err(err);
	     exit(1);
	 }

Before, object_create() reports from within qemu_opts_foreach(), using
the option's location.  Afterwards, we do it after
qemu_opts_foreach(), using whatever location happens to be current
there.  Commonly a "none" location.

This is because Error objects don't have location information.
Problematic.

Reproducer:

    $ qemu-system-x86_64 -nodefaults -display none -object secret,id=foo,foo=bar
    qemu-system-x86_64: Property '.foo' not found

Note no location.  This commit restores it:

    qemu-system-x86_64: -object secret,id=foo,foo=bar: Property '.foo' not found

Note that the qemu_opts_foreach() bug just fixed could mask the bug
here: if the location it leaves dangling hasn't been clobbered, yet,
it's the correct one.

Reported-by: Eric Blake <eblake@redhat.com>
Cc: Daniel P. Berrange <berrange@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <1461767349-15329-4-git-send-email-armbru@redhat.com>
Reviewed-by: Daniel P. Berrange <berrange@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
[Paragraph on Error added to commit message]
This commit is contained in:
Markus Armbruster 2016-04-27 16:29:09 +02:00
parent d9d3aaea0b
commit 51b9b478cc
6 changed files with 21 additions and 39 deletions
Download patch file Download diff file Expand all files Collapse all files

5
include/qom/object_interfaces.h
View file

@ -140,7 +140,7 @@ typedef bool (*user_creatable_add_opts_predicate)(const char *type);
* user_creatable_add_opts_foreach:
* @opaque: a user_creatable_add_opts_predicate callback or NULL
* @opts: options to create
* @errp: if an error occurs, a pointer to an area to store the error
* @errp: unused
*
* An iterator callback to be used in conjunction with
* the qemu_opts_foreach() method for creating a list of
@ -148,8 +148,9 @@ typedef bool (*user_creatable_add_opts_predicate)(const char *type);
*
* The @opaque parameter can be passed a user_creatable_add_opts_predicate
* callback to filter which types of object are created during iteration.
* When it fails, report the error.
*
* Returns: 0 on success, -1 on error
* Returns: 0 on success, -1 when an error was reported.
*/
int user_creatable_add_opts_foreach(void *opaque,
QemuOpts *opts, Error **errp);