From: David Barr <david.barr@cordelta.com>
Date: Sat, 5 Mar 2011 02:30:23 +0000 (+1100)
Subject: vcs-svn: set up channel to read fast-import cat-blob response
X-Git-Tag: v1.7.12-rc0~41^2~13^2~5^2~8
X-Git-Url: https://git.lorimer.id.au/gitweb.git/diff_plain/41529bbce407fbf1a925cfbc7c1aa30064f66ae7?hp=41529bbce407fbf1a925cfbc7c1aa30064f66ae7

vcs-svn: set up channel to read fast-import cat-blob response

Set up some plumbing: teach the svndump lib to pass a file descriptor
number to the fast_export lib, representing where cat-blob/ls
responses can be read from, and add a get_response_line helper
function to the fast_export lib to read a line from that file.

Unfortunately this means that svn-fe needs file descriptor 3 to be
redirected from somewhere (preferrably the cat-blob stream of a
fast-import backend); otherwise it will fail:

$ svndump <path> | svn-fe
fatal: cannot read from file descriptor 3: Bad file descriptor

For the moment, "svn-fe 3</dev/null" works as a workaround but it
will not work for very long.  A fast-import backend that can retrieve
old commits is needed in order to be able to fulfill svn
"Node-copyfrom-rev" requests that refer to revs from a previous run.

[jn: with new change description]

Based-on-patch-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: David Barr <david.barr@cordelta.com>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
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