[PATCH] virsh: cmdBlockcopy: Remove 'error:' prefix for an empty line

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When a block copy job fails prior to reaching the synchronized phase
while we are waiting for the job to finish virsh would print the
following:

 $ virsh blockcopy backup-test vda /tmp/dst.qcow2 --wait --reuse-external --transient-job
 error:
 Copy failed

The above message looks like we've forgot to print the error message
itself as the line ends after 'error:'. Unfortunately with the current
API design clients have no way of actually getting the error message as
the VIR_DOMAIN_EVENT_ID_BLOCK_JOB(_2) event only reports the status but
not an error and the job then vanishes.

Fix the expectations by using vshPrintExtra instead of vshError:

 $ virsh blockcopy backup-test vda /tmp/dst.qcow2 --wait --reuse-external --transient-job

 Copy failed

Note that the newline is required to avoid printing the 'Copy failed'
message on the same line when printing the job progress percentage.

Inspired by https://bugzilla.redhat.com/show_bug.cgi?id=1847867

Signed-off-by: Peter Krempa <pkrempa@xxxxxxxxxx>
---
 tools/virsh-domain.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/virsh-domain.c b/tools/virsh-domain.c
index 5222949566..3597fb6272 100644
--- a/tools/virsh-domain.c
+++ b/tools/virsh-domain.c
@@ -2457,7 +2457,7 @@ cmdBlockcopy(vshControl *ctl, const vshCmd *cmd)
             break;

         case VIR_DOMAIN_BLOCK_JOB_FAILED:
-            vshError(ctl, "\n%s", _("Copy failed"));
+            vshPrintExtra(ctl, "\n%s", _("Copy failed"));
             goto cleanup;
             break;

-- 
2.26.2




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