When parsing legacy NBD backing file strings such as 'nbd:unix:/tmp/sock:exportname=/' we'd fail to set the transport to VIR_STORAGE_NET_HOST_TRANS_UNIX. This started to be a problem once we actually started to generate config of the backing store on the command line with -blockdev as the JSON code would try to format it as TCP and fail with: internal error: argument key 'host' must not have null value Set the type properly and add a test. This bug was found by the libguestfs test suite in: https://bugzilla.redhat.com/show_bug.cgi?id=1791614 Signed-off-by: Peter Krempa <pkrempa(a)redhat.com&gt; --- src/util/virstoragefile.c | 2 +- tests/virstoragetest.c | 4 ++++ 2 files changed, 5 insertions(+), 1 deletion(-) diff --git a/src/util/virstoragefile.c b/src/util/virstoragefile.c index 1397f532fd..7a2af0ad94 100644 --- a/src/util/virstoragefile.c +++ b/src/util/virstoragefile.c @@ -2964,7 +2964,7 @@ virStorageSourceParseNBDColonString(const char *nbdstr, } src->hosts->socket = g_strdup(backing[2]); - + src->hosts->transport = VIR_STORAGE_NET_HOST_TRANS_UNIX; } else { src->hosts->name = g_strdup(backing[1]); diff --git a/tests/virstoragetest.c b/tests/virstoragetest.c index 2862758752..370e19252b 100644 --- a/tests/virstoragetest.c +++ b/tests/virstoragetest.c @@ -1258,6 +1258,10 @@ mymain(void) "<source protocol='nbd' name=':test'>\n" " <host name='example.org' port='6000'/>\n" "</source>\n"); + TEST_BACKING_PARSE("nbd:unix:/tmp/sock:exportname=/", + "<source protocol='nbd' name='/'>\n" + " <host transport='unix' socket='/tmp/sock'/>\n" + "</source>\n"); TEST_BACKING_PARSE("nbd://example.org:1234", "<source protocol='nbd'>\n" " <host name='example.org' port='1234'/>\n" -- 2.24.1