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| author | Eric Blake <eblake@redhat.com> | 2020-02-11 20:31:01 -0600 |
|---|---|---|
| committer | Eric Blake <eblake@redhat.com> | 2020-02-26 14:45:02 -0600 |
| commit | 2485f22fe9211b2e80970f83199b320eee211319 (patch) | |
| tree | b8a36d243a80c0d12c6e40e9e636c226df7bdcb5 /block/nbd.c | |
| parent | 73e064ccf09d908febc83761addcc6e76feabf78 (diff) | |
| download | qemu-2485f22fe9211b2e80970f83199b320eee211319.zip | |
nbd-client: Support leading / in NBD URI
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 <eblake@redhat.com>
Message-Id: <20200212023101.1162686-1-eblake@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Diffstat (limited to 'block/nbd.c')
| -rw-r--r-- | block/nbd.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/block/nbd.c b/block/nbd.c index 6d3b22f844..f69e61e68a 100644 --- a/block/nbd.c +++ b/block/nbd.c @@ -1528,8 +1528,10 @@ 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); } |