Add an example image formatted by:

 qemu-img create -f qcow2 -o data_file=nbd+unix:///datafile?socket=/tmp/nbd,data_file_raw=true /tmp/nbddatastore.qcow2 10M -u

serving as an example when qemu records an empty string as the
'data_file' field.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
---
 tests/virstoragetest.c                         |   5 +++++
 .../images/datafile-emptystr.qcow2             | Bin 0 -> 327680 bytes
 2 files changed, 5 insertions(+)
 create mode 100644 tests/virstoragetestdata/images/datafile-emptystr.qcow2

diff --git a/tests/virstoragetest.c b/tests/virstoragetest.c
index 4ec837eefb..78dc644637 100644
--- a/tests/virstoragetest.c
+++ b/tests/virstoragetest.c
@@ -494,6 +494,11 @@ mymain(void)
                abs_srcdir "/virstoragetestdata/images/qcow2datafile-datafile.qcow2",
                VIR_STORAGE_FILE_QCOW2, EXP_PASS);

+    /* broken qcow2 with a 'data_file' which is an empty string */
+    TEST_CHAIN("qcow2-datafile-broken",
+               abs_srcdir "/virstoragetestdata/images/datafile-emptystr.qcow2",
+               VIR_STORAGE_FILE_QCOW2, EXP_FAIL);
+
     /* Test various combinations of qcow2 images with missing 'backing_format' */
     TEST_CHAIN("qcow2-qcow2_qcow2-qcow2_qcow2-auto",
                abs_srcdir "/virstoragetestdata/images/qcow2_qcow2-qcow2_qcow2-auto.qcow2",
diff --git a/tests/virstoragetestdata/images/datafile-emptystr.qcow2 b/tests/virstoragetestdata/images/datafile-emptystr.qcow2
new file mode 100644
index 0000000000000000000000000000000000000000..18fae8740b4d650252d9a20629ca6e4d04653692
GIT binary patch
literal 327680
zcmeIuK}y3w6b9f)+5>omoWUCuL=fBvg6p(NG0>(VouYNsV+(F1sS&bCUEA*q4D;Un
znPKMX{^2WxFbiWh=Q16-Nk17<=juF;&BtZGLDy@B{@vnv(am3HpD!UKrx1#&jmK<R
z#UU~+S?${P(8Ry~k(TeVZ0mfJ6?x3Fb+suc516fX+omn|`)XHb@z_kKLzs8_*F{-m
zkGEM_$F?f>69*(=lYbnuwp_1vhdNG0dudo!aho?6gFn)w&EK-oorfg=0000000000
z00000000000000000000000000000000000000000000000000000000000000000
z0D#NV%Mkzo0000000000000000000000000000000000000000000000000000000
z000000000000000000000RFk;_X7X`00000000000000000000000000000000000
z0000000000000000000000000000000000000000;EJ8PyU(xq0RR910000000000
z00000000000000000000000000000000000000000000000000000000000000000
z=$*U+000000000000000000000000000000000000000000000000000000000000
V0000000000000000000Xgm1%)GK2sC

literal 0
HcmV?d00001

-- 
2.47.1