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Re: missing error messages

From: Stefan Sperling <stsp_at_elego.de>
Date: Wed, 3 Mar 2010 17:08:41 +0100

On Wed, Mar 03, 2010 at 04:06:08PM +0100, Janus Weil wrote:
> Dear subversion team,
> I noticed that recent svn releases fail to display many error messages.
> Example: Doing "svn co svn+ssh://someone@gcc.gnu.org/svn/gcc/trunk
> trunk" without having the proper ssh keys for user 'someone'. The svn
> versions I tried were 1.6.3, 1.6.5 and 1.6.9. With 1.6.3 I get:
> Permission denied (publickey,gssapi-with-mic).
> svn: Network connection closed unexpectedly
> But if I do the same with 1.6.5 or 1.6.9, the first line is missing
> and I only get the rather nebulous message about the unexpected
> closing of the network connection, without seeing the reason for that.
> It's even worse if e.g. my private key has the wrong permissions for
> some reason. In this case svn 1.6.3 displays a very bold warning:
> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
> Permissions 0755 for '~/.ssh/id_dsa' are too open.
> It is recommended that your private key files are NOT accessible by others.
> This private key will be ignored.
> bad permissions: ignore key: ~/.ssh/id_dsa
> Permission denied (publickey,gssapi-with-mic).
> svn: Network connection closed unexpectedly
> Again, with newer releases one only gets the last line, without any
> chance of finding out what the problem is.
> Is this a known bug?

This is probably a side-effect of the fix for issue #2580 done in
Subversion 1.6.5. Since then, Subversion passes '-q' to ssh to avoid
the message 'Terminated by signal 15' being printed whenever ssh exists
upon being terminated by Subversion in a friendly manner.
This particular output from ssh would confuse users assuming the output
came from svn, and make them believe svn had crashed. Of course, '-q'
might also suppress some other messages printed by ssh, such as the
"unprotected key file" warning.

I guess we should make the error message for svn+ssh connection failures
advise people to remove the '-q' flag from the ssh invocation in
~/.subversion/config to debug SSH connection problems.
The patch below does this:

  $ svn ls svn+ssh://svntest/
  svn: Unable to connect to a repository at URL 'svn+ssh://svntest'
  svn: To better debug SSH connection problems, remove the -q option from 'ssh' in the [tunnels] section of your Subversion configuration file.
  svn: Network connection closed unexpectedly

(Above, 'svntest' is an SSH host alias to localhost with a port where nothing
is listening.)

Do you think this would help?


Index: subversion/libsvn_ra_svn/client.c
--- subversion/libsvn_ra_svn/client.c (revision 918491)
+++ subversion/libsvn_ra_svn/client.c (working copy)
@@ -463,6 +463,7 @@ static svn_error_t *make_tunnel(const char **args,
   apr_status_t status;
   apr_proc_t *proc;
   apr_procattr_t *attr;
+ svn_error_t *err;
   status = apr_procattr_create(&attr, pool);
   if (status == APR_SUCCESS)
@@ -516,7 +517,15 @@ static svn_error_t *make_tunnel(const char **args,
   /* Guard against dotfile output to stdout on the server. */
   *conn = svn_ra_svn_create_conn(NULL, proc->out, proc->in, pool);
- SVN_ERR(svn_ra_svn_skip_leading_garbage(*conn, pool));
+ err = svn_ra_svn_skip_leading_garbage(*conn, pool);
+ if (err)
+ return svn_error_quick_wrap(
+ err,
+ _("To better debug SSH connection problems, remove the -q "
+ "option from 'ssh' in the [tunnels] section of your "
+ "Subversion configuration file."));
   return SVN_NO_ERROR;
Received on 2010-03-03 17:09:28 CET

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