Re: git 2.3.4, ssh: Could not resolve hostname

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On Apr 2, 2015, at 17:02, Torsten Bögershausen wrote:

On 2015-04-02 21.35, Jeff King wrote:
On Thu, Apr 02, 2015 at 12:31:14PM -0700, Reid Woodbury Jr. wrote:

Ah, understand. Here's my project URL for 'remote "origin"' with a
more meaningful representation of their internal FQDN:

	url = ssh://rwoodbury@systemname.groupname.online:/opt/git/inventory.git

The "online" is their literal internal TLD.

Thanks. The problem is the extra ":" after "online"; your URL is
malformed. You can just drop that colon entirely.

I do not think we need to support this syntax going forward (the colon
is meaningless here, and our documentation is clear that it should go
with a port number), but on the other hand, it might be nice to be more liberal, as we were in v2.3.3 and prior. I'll leave it to Torsten to see whether supporting that would hurt some of the other cases, or whether
it would make the code too awkward.

-Peff

Thanks for digging.

This makes my think that it is
a) non-standard to have the extra colon

It's not.  See RFC 3986 appendix A:

  authority = [ userinfo "@" ] host [ ":" port ]

  port = *DIGIT

"*DIGIT" means (see RFC 2234 section 3.6) zero or more digits.

b) The error message could be better
c) We don't have a test case
d) This reminds my of an improvement from Linus:
608d48b2207a61528
......
So when somebody passes me a "please pull" request pointing to something
   like the following

   	git://git.kernel.org:/pub/scm/linux/kernel/git/mchehab/v4l-dvb.git

(note the extraneous colon at the end of the host name), git would happily try to connect to port 0, which would generally just cause the remote to not even answer, and the "connect()" will take a long time to time out.
.....

Sorry guys for the regression, the old parser handled the extra colon as "port 0", the new one looks for the "/" as the end of the hostname (and the beginning of the path)

Either we accept the extra colon as before, or the parser puts out a better error message,

[...]

Spontaneously I would say that a trailing ':' at the end of a hostname in the ssh:// scheme
can be safely ignored, what do you think ?

You know, there is a "url_normalize" routine in urlmatch.h/urlmatch.c that checks for a lot of these things and provides a translated error message if there's a problem as well as normalizing and separating out the various parts of the URL. It does not currently handle default ports for anything other than http[s] but it would be simple enough to add support for ssh, git, ftp[s] and rsync default ports too.

-Kyle--
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