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Re: [Qemu-devel] [PATCH] block/curl: Add support for Secure Shell (ssh/s
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-devel] [PATCH] block/curl: Add support for Secure Shell (ssh/sftp) block device |
Date: |
Fri, 22 Mar 2013 14:41:24 +0100 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Fri, Mar 22, 2013 at 01:04:55PM +0000, Richard W.M. Jones wrote:
>
> I got it working with Curl, patch attached.
>
> However there are multiple issues (these are mainly notes for myself):
>
> (1) libcurl cannot read the size of the file. I had to hard-code
> this. This is probably just a shortcoming of libcurl (libssh2/sftp
> itself can read the size of files). Will try to work on a patch for
> upstream.
>
> (2) Fedora's curl (which is heavily patched) is broken in some way and
> deadlocks itself. Upstream curl from git works better. I haven't yet
> identified which patch/commit is responsible.
>
> (3) ssh-agent authentication doesn't work. It appears that either
> ssh-agent itself doesn't like multiple connections from a single
> process (qemu), or libcurl/libssh2 is having a problem with making
> multiple connections out to ssh-agent. If I disable ssh-agent auth,
> it works. Still investigating this.
>
> (4) You must specify a user@ in the URL, else libcurl tries to
> authenticate as user "". I will see if I can send a fix for this
> upstream.
>
> (5) Although it gets much of the way through a boot of a guest, it
> eventually segfaults. Still investigating this.
>
> (6) There are several more issues marked by XXX's in the code.
Thank you for improving libcurl! You're making it better for everybody.
A lot of people go back to NIH when they hit limitations in existing
software.
Stefan
Re: [Qemu-devel] [PATCH] block: Add support for Secure Shell (ssh) block device., Kevin Wolf, 2013/03/25