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RE: [vote] pin-externals branch to trunk

From: Bert Huijben <bert_at_qqmail.nl>
Date: Wed, 28 Jan 2015 11:39:18 +0100

> -----Original Message-----
> From: Branko Čibej [mailto:brane_at_wandisco.com]
> Sent: woensdag 28 januari 2015 11:11
> To: dev_at_subversion.apache.org
> Subject: Re: [vote] pin-externals branch to trunk
> On 28.01.2015 10:54, Stefan Sperling wrote:
> > There is a known problem where relative URLs in the externals definition
> > may become absolute when pinned. This happens if the URL of an external
> > resolves to a different path at its last-changed revision. For instance,
> > an external definition at r600 might look like this:
> > ^/moo/bar ext_bar
> > If the last-changed revision of /moo/bar resolves to r500, and 'moo'
> > was renamed from 'foo' between r500 and r600, then the pinned external
> > will use an absolute URL in the current implementation:
> > http://svn.example.com/svn/repos/foo/bar@500 ext_bar
> > This problem could probably be solved by adding additional APIs which
> > resolve the URL http://svn.example.com/svn/repos/foo/bar to a particular
> > type of relative URL (such as ^/foo/bar, /svn/repos/foo/bar, ../foo/bar,
> > //svn.example.com/svn/repos/foo/bar, or ^/../repos/foo/bar). Additionally,
> > APIs which provide information about the type of a given relative external
> > URL would be neded. Currently, our APIs don't offer such functionality.
> Ouch. This shouldn't stop the merge, but I really think we can't release
> with this restriction. A major problem here is that the generated
> absolute URL depends on the access method being used for the copy, or
> the one used during checkout for a WC->WC copy. Depending on server
> configuration, this could easily make the resulting copy (tag) unusable;
> consider a configuration where everyone has read-only access to http://
> but read/write access through https:// always requires authentication.
> Read-only users would not be able to export or check out from the tag.
> More review later ...

(Also asked on IRC)
Why does this branch go through all the trouble of pinning the 'last changed revision' of all URLs to be pinned

I would say that pinning, should pin exactly how a current checkout behaves. Now it goes find older urls of things, etc.

I have a working copy with an external pointing to ^/subversion/tags/1.8.11/subversion/ libsvn_fs_util

If I would now call this new pin operation I would get an external pointing to ^/subversion/trunk/subversion/libsvn_fs_util_at_1460176
(as nothing on this directory was changed during 1.8.x, and this is the url where it last changed)

While I would really expect an external pointing to something like ^/subversion/tags/1.8.11/subversion/libsvn_fs_util_at_1655064 (assuming r1655064 is HEAD at the time of pinning)

Somebody reviewing this, would probably note that I should stick to using released code, instead of using 'trunk' code...

Received on 2015-01-28 11:39:56 CET

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