[PATCH] qemu: Report error if per-VM directory cannot be created

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Commit f1f68ca33433 did not report an error if virFileMakePath()
returned -1.  Well, who would've guessed function with name starting
with 'vir' sets an errno instead of reporting an error the libvirt way.
Anyway, let's fix it, so the output changes from:

  $ virsh start arm
  error: Failed to start domain arm
  error: An error occurred, but the cause is unknown

to:

  $ virsh start arm
  error: Failed to start domain arm
  error: Cannot create directory '/var/lib/libvirt/qemu/domain-arm': Not
  a directory

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1146886

Signed-off-by: Martin Kletzander <mkletzan@xxxxxxxxxx>
---
 src/qemu/qemu_process.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index f7eb2b609437..d9a0942c4dfd 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -4734,8 +4734,10 @@ int qemuProcessStart(virConnectPtr conn,
     if (virAsprintf(&tmppath, "%s/domain-%s", cfg->libDir, vm->def->name) < 0)
         goto cleanup;

-    if (virFileMakePath(tmppath) < 0)
+    if (virFileMakePath(tmppath) < 0) {
+        virReportSystemError(errno, _("Cannot create directory '%s'"), tmppath);
         goto cleanup;
+    }

     if (virSecurityManagerDomainSetDirLabel(driver->securityManager,
                                             vm->def, tmppath) < 0)
@@ -4747,8 +4749,10 @@ int qemuProcessStart(virConnectPtr conn,
                     cfg->channelTargetDir, vm->def->name) < 0)
         goto cleanup;

-    if (virFileMakePath(tmppath) < 0)
+    if (virFileMakePath(tmppath) < 0) {
+        virReportSystemError(errno, _("Cannot create directory '%s'"), tmppath);
         goto cleanup;
+    }

     if (virSecurityManagerDomainSetDirLabel(driver->securityManager,
                                             vm->def, tmppath) < 0)
-- 
2.5.1

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