[libvirt] [PATCH] qemu: treat iso images as raw

[Nikolay Shirokovskiy]

if image format probing is on and image format of iso file
is not specified qemu fail to start a domain or change disk
media giving errors like [1]. The problem is format is being
detected as 'iso' and qemu expect format to be raw for iso
images.

It makes sense to me because iso refers to filesystem format
in image not image format itself. Thus let's just convert
iso to raw in case of qemu.

There is a similar patch for storage pools - 0e5db762.

[1] Unknown driver 'iso'

---

ISO as image format was added right at the beginning by e266ded2f
without any further comments. Maybe we just can drop ISO from image
formats entirely as it is not image format or some hypervisors
treat it in a special way?

 src/qemu/qemu_domain.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index c7c9e94..3da9271 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -6023,8 +6023,13 @@ qemuDomainDetermineDiskChain(virQEMUDriverPtr driver,
     if (virStorageFileGetMetadata(disk->src,
                                   uid, gid,
                                   cfg->allowDiskFormatProbing,
-                                  report_broken) < 0)
+                                  report_broken) < 0) {
         ret = -1;
+        goto cleanup;
+    }
+
+    if (virDomainDiskGetFormat(disk) == VIR_STORAGE_FILE_ISO)
+        virDomainDiskSetFormat(disk, VIR_STORAGE_FILE_RAW);
 
  cleanup:
     virObjectUnref(cfg);
-- 
1.8.3.1