[PATCH] nbd-client: Support leading / in NBD URI

[Eric Blake]

The NBD URI specification [1] states that only one leading slash at
the beginning of the URI path component is stripped, not all such
slashes.  This becomes important to a patch I just proposed to nbdkit
[2], which would allow the exportname to select a file embedded within
an ext2 image: ext2fs demands an absolute pathname beginning with '/',
and because qemu was inadvertantly stripping it, my nbdkit patch had
to work around the behavior.

[1] https://github.com/NetworkBlockDevice/nbd/blob/master/doc/uri.md
[2] https://www.redhat.com/archives/libguestfs/2020-February/msg00109.html

Note that the qemu bug only affects handling of URIs such as
nbd://host:port//abs/path (where '/abs/path' should be the export
name); it is still possible to use --image-opts and pass the desired
export name with a leading slash directly through JSON even without
this patch.

Signed-off-by: Eric Blake <address@hidden>
---
 block/nbd.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/block/nbd.c b/block/nbd.c
index d085554f21ea..82f9b7ef50a5 100644
--- a/block/nbd.c
+++ b/block/nbd.c
@@ -1516,8 +1516,10 @@ static int nbd_parse_uri(const char *filename, QDict 
*options)
         goto out;
     }

-    p = uri->path ? uri->path : "/";
-    p += strspn(p, "/");
+    p = uri->path ? uri->path : "";
+    if (p[0] == '/') {
+        p++;
+    }
     if (p[0]) {
         qdict_put_str(options, "export", p);
     }
-- 
2.24.1