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

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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>
This commit is contained in:
David Barr
2011-03-05 13:30:23 +11:00
committed by Jonathan Nieder
parent efc749b48f
commit 41529bbce4
5 changed files with 109 additions and 52 deletions
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6
contrib/svn-fe/svn-fe.txt
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@ -7,7 +7,11 @@ svn-fe - convert an SVN "dumpfile" to a fast-import stream
SYNOPSIS
--------
svnadmin dump --incremental REPO | svn-fe [url] | git fast-import
[verse]
mkfifo backchannel &&
svnadmin dump --incremental REPO |
svn-fe [url] 3<backchannel |
git fast-import --cat-blob-fd=3 3>backchannel
DESCRIPTION
-----------