[Qemu-devel] [PATCH] qemu-img: Report error even with --oformat=json

[Max Reitz]

img_check() should report that the format of the given image does not
support checks even if JSON output is desired. JSON data is output to
stdout, as opposed to error messages, which are (in the case of
qemu-img) printed to stderr. Therefore, it is easy to distinguish
between the two.

Also, img_info() does already use error_report() for human-readable
messages even though JSON output is desired (through
collect_image_info_list()).

Signed-off-by: Max Reitz <address@hidden>
---
As the old code deliberately emitted the error only in case of
human-readable output, I asked Federico, the original author, for his
opinion in https://bugzilla.redhat.com/show_bug.cgi?id=1054753, but did
not receive a reply so far.
---
 qemu-img.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/qemu-img.c b/qemu-img.c
index d118da5..b3d2bc6 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -663,9 +663,7 @@ static int img_check(int argc, char **argv)
     ret = collect_image_check(bs, check, filename, fmt, fix);
 
     if (ret == -ENOTSUP) {
-        if (output_format == OFORMAT_HUMAN) {
-            error_report("This image format does not support checks");
-        }
+        error_report("This image format does not support checks");
         ret = 63;
         goto fail;
     }
-- 
1.9.3