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path: root/vcs-svn/line_buffer.txt
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2020-08-13drop vcs-svn experimentJeff King
The code in vcs-svn was started in 2010 as an attempt to build a remote-helper for interacting with svn repositories (as opposed to git-svn). However, we never got as far as shipping a mature remote helper, and the last substantive commit was e99d012a6bc in 2012. We do have a git-remote-testsvn, and it is even installed as part of "make install". But given the name, it seems unlikely to be used by anybody (you'd have to explicitly "git clone testsvn::$url", and there have been zero mentions of that on the mailing list since 2013, and even that includes the phrase "you might need to hack a bit to get it working properly"[1]). We also ship contrib/svn-fe, which builds on the vcs-svn work. However, it does not seem to build out of the box for me, as the link step misses some required libraries for using libgit.a. Curiously, the original build breakage bisects for me to eff80a9fd9 (Allow custom "comment char", 2013-01-16), which seems unrelated. There was an attempt to fix it in da011cb0e7 (contrib/svn-fe: fix Makefile, 2014-08-28), but on my system that only switches the error message. So it seems like the result is not really usable by anybody in practice. It would be wonderful if somebody wanted to pick up the topic again, and potentially it's worth carrying around for that reason. But the flip side is that people doing tree-wide operations have to deal with this code. And you can see the list with (replace "HEAD" with this commit as appropriate): { echo "--" git diff-tree --diff-filter=D -r --name-only HEAD^ HEAD } | git log --no-merges --oneline e99d012a6bc.. --stdin which shows 58 times somebody had to deal with the code, generally due to a compile or test failure, or a tree-wide style fix or API change. Let's drop it and let anybody who wants to pick it up do so by resurrecting it from the git history. As a bonus, this also reduces the size of a stripped installation of Git from 21MB to 19MB. [1] https://lore.kernel.org/git/CALkWK0mPHzKfzFKKpZkfAus3YVC9NFYDbFnt+5JQYVKipk3bQQ@mail.gmail.com/ Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-03-26vcs-svn: remove buffer_read_stringJonathan Nieder
All previous users of buffer_read_string have already been converted to use the more intuitive buffer_read_binary, so remove the old API to avoid some confusion. Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
2011-03-22vcs-svn: make buffer_skip_bytes return length readJonathan Nieder
Currently there is no way to detect when input ended if it ended early during buffer_skip_bytes. Tell the calling program how many bytes were actually skipped for easier debugging. Existing callers will still ignore early EOF. Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: David Barr <david.barr@cordelta.com> Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
2011-02-26vcs-svn: teach line_buffer about temporary filesJonathan Nieder
It can sometimes be useful to write information temporarily to file, to read back later. These functions allow a program to use the line_buffer facilities when doing so. It works like this: 1. find a unique filename with buffer_tmpfile_init. 2. rewind with buffer_tmpfile_rewind. This returns a stdio handle for writing. 3. when finished writing, declare so with buffer_tmpfile_prepare_to_read. The return value indicates how many bytes were written. 4. read whatever portion of the file is needed. 5. if finished, remove the temporary file with buffer_deinit. otherwise, go back to step 2, The svn support would use this to buffer the postimage from delta application until the length is known and fast-import can receive the resulting blob. Based-on-patch-by: David Barr <david.barr@cordelta.com> Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
2011-02-26vcs-svn: allow input from file descriptorJonathan Nieder
Based-on-patch-by: David Barr <david.barr@cordelta.com> Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
2011-02-26vcs-svn: teach line_buffer to handle multiple input filesJonathan Nieder
Collect the line_buffer state in a newly public line_buffer struct. Callers can use multiple line_buffers to manage input from multiple files at a time. svn-fe's delta applier will use this to stream a delta from svnrdump and the preimage it applies to from fast-import at the same time. The tests don't take advantage of the new features, but I think that's okay. It is easier to find lingering examples of nonreentrant code by searching for "static" in line_buffer.c. Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
2010-08-15Add stream helper libraryDavid Barr
This library provides thread-unsafe fgets()- and fread()-like functions where the caller does not have to supply a buffer. It maintains a couple of static buffers and provides an API to use them. [rr: allow input from files other than stdin] [jn: with tests, documentation, and error handling improvements] Signed-off-by: David Barr <david.barr@cordelta.com> Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com> Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>