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simplesshd/rsync/TODO
Greg Alexander d8cc8daef9 rsync 3.1.1 source, after i trimmed away the parts we obviously won't 
need...but most of it remains.
2014-12-21 17:56:03 -05:00

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-*- indented-text -*-
FEATURES ------------------------------------------------------------
Use chroot only if supported
Allow supplementary groups in rsyncd.conf 2002/04/09
Handling IPv6 on old machines
Other IPv6 stuff
Add ACL support 2001/12/02
proxy authentication 2002/01/23
SOCKS 2002/01/23
FAT support
--diff david.e.sewell 2002/03/15
Add daemon --no-fork option
Create more granular verbosity 2003/05/15
DOCUMENTATION --------------------------------------------------------
Keep list of open issues and todos on the web site
Perhaps redo manual as SGML
LOGGING --------------------------------------------------------------
Memory accounting
Improve error messages
Better statistics Rasmus 2002/03/08
Perhaps flush stdout like syslog
Log child death on signal
verbose output David Stein 2001/12/20
internationalization
DEVELOPMENT --------------------------------------------------------
Handling duplicate names
Use generic zlib 2002/02/25
TDB 2002/03/12
Splint 2002/03/12
PERFORMANCE ----------------------------------------------------------
Traverse just one directory at a time
Allow skipping MD4 file_sum 2002/04/08
Accelerate MD4
TESTING --------------------------------------------------------------
Torture test
Cross-test versions 2001/08/22
Test on kernel source
Test large files
Create mutator program for testing
Create configure option to enable dangerous tests
Create pipe program for testing
Create test makefile target for some tests
RELATED PROJECTS -----------------------------------------------------
rsyncsh
http://rsync.samba.org/rsync-and-debian/
rsyncable gzip patch
rsyncsplit as alternative to real integration with gzip?
reverse rsync over HTTP Range
FEATURES ------------------------------------------------------------
Use chroot only if supported
If the platform doesn't support it, then don't even try.
If running as non-root, then don't fail, just give a warning.
(There was a thread about this a while ago?)
http://lists.samba.org/pipermail/rsync/2001-August/thread.html
http://lists.samba.org/pipermail/rsync/2001-September/thread.html
-- --
Allow supplementary groups in rsyncd.conf 2002/04/09
Perhaps allow supplementary groups to be specified in rsyncd.conf;
then make the first one the primary gid and all the rest be
supplementary gids.
-- --
Handling IPv6 on old machines
The KAME IPv6 patch is nice in theory but has proved a bit of a
nightmare in practice. The basic idea of their patch is that rsync
is rewritten to use the new getaddrinfo()/getnameinfo() interface,
rather than gethostbyname()/gethostbyaddr() as in rsync 2.4.6.
Systems that don't have the new interface are handled by providing
our own implementation in lib/, which is selectively linked in.
The problem with this is that it is really hard to get right on
platforms that have a half-working implementation, so redefining
these functions clashes with system headers, and leaving them out
breaks. This affects at least OSF/1, RedHat 5, and Cobalt, which
are moderately improtant.
Perhaps the simplest solution would be to have two different files
implementing the same interface, and choose either the new or the
old API. This is probably necessary for systems that e.g. have
IPv6, but gethostbyaddr() can't handle it. The Linux manpage claims
this is currently the case.
In fact, our internal sockets interface (things like
open_socket_out(), etc) is much narrower than the getaddrinfo()
interface, and so probably simpler to get right. In addition, the
old code is known to work well on old machines.
We could drop the rather large lib/getaddrinfo files.
-- --
Other IPv6 stuff
Implement suggestions from http://www.kame.net/newsletter/19980604/
and ftp://ftp.iij.ad.jp/pub/RFC/rfc2553.txt
If a host has multiple addresses, then listen try to connect to all
in order until we get through. (getaddrinfo may return multiple
addresses.) This is kind of implemented already.
Possibly also when starting as a server we may need to listen on
multiple passive addresses. This might be a bit harder, because we
may need to select on all of them. Hm.
-- --
Add ACL support 2001/12/02
Transfer ACLs. Need to think of a standard representation.
Probably better not to even try to convert between NT and POSIX.
Possibly can share some code with Samba.
NOTE: there is a patch that implements this in the "patches" subdir.
-- --
proxy authentication 2002/01/23
Allow RSYNC_PROXY to be http://user:pass@proxy.foo:3128/, and do
HTTP Basic Proxy-Authentication.
Multiple schemes are possible, up to and including the insanity that
is NTLM, but Basic probably covers most cases.
-- --
SOCKS 2002/01/23
Add --with-socks, and then perhaps a command-line option to put them
on or off. This might be more reliable than LD_PRELOAD hacks.
-- --
FAT support
rsync to a FAT partition on a Unix machine doesn't work very well at
the moment. I think we get errors about invalid filenames and
perhaps also trying to do atomic renames.
I guess the code to do this is currently #ifdef'd on Windows;
perhaps we ought to intelligently fall back to it on Unix too.
-- --
--diff david.e.sewell 2002/03/15
Allow people to specify the diff command. (Might want to use wdiff,
gnudiff, etc.)
Just diff the temporary file with the destination file, and delete
the tmp file rather than moving it into place.
Interaction with --partial.
Security interactions with daemon mode?
-- --
Add daemon --no-fork option
Very useful for debugging. Also good when running under a
daemon-monitoring process that tries to restart the service when the
parent exits.
-- --
Create more granular verbosity 2003/05/15
Control output with the --report option.
The option takes as a single argument (no whitespace) a
comma delimited lists of keywords.
This would separate debugging from "logging" as well as
fine grained selection of statistical reporting and what
actions are logged.
http://lists.samba.org/archive/rsync/2003-May/006059.html
-- --
DOCUMENTATION --------------------------------------------------------
Keep list of open issues and todos on the web site
-- --
Perhaps redo manual as SGML
The man page is getting rather large, and there is more information
that ought to be added.
TexInfo source is probably a dying format.
Linuxdoc looks like the most likely contender. I know DocBook is
favoured by some people, but it's so bloody verbose, even with emacs
support.
-- --
LOGGING --------------------------------------------------------------
Memory accounting
At exit, show how much memory was used for the file list, etc.
Also we do a wierd exponential-growth allocation in flist.c. I'm
not sure this makes sense with modern mallocs. At any rate it will
make us allocate a huge amount of memory for large file lists.
-- --
Improve error messages
If we hang or get SIGINT, then explain where we were up to. Perhaps
have a static buffer that contains the current function name, or
some kind of description of what we were trying to do. This is a
little easier on people than needing to run strace/truss.
"The dungeon collapses! You are killed." Rather than "unexpected
eof" give a message that is more detailed if possible and also more
helpful.
If we get an error writing to a socket, then we should perhaps
continue trying to read to see if an error message comes across
explaining why the socket is closed. I'm not sure if this would
work, but it would certainly make our messages more helpful.
What happens if a directory is missing -x attributes. Do we lose
our load? (Debian #28416) Probably fixed now, but a test case would
be good.
-- --
Better statistics Rasmus 2002/03/08
<Rasmus>
hey, how about an rsync option that just gives you the
summary without the list of files? And perhaps gives
more information like the number of new files, number
of changed, deleted, etc. ?
<mbp>
nice idea there is --stats but at the moment it's very
tridge-oriented rather than user-friendly it would be
nice to improve it that would also work well with
--dryrun
-- --
Perhaps flush stdout like syslog
Perhaps flush stdout after each filename, so that people trying to
monitor progress in a log file can do so more easily. See
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=48108
-- --
Log child death on signal
If a child of the rsync daemon dies with a signal, we should notice
that when we reap it and log a message.
-- --
verbose output David Stein 2001/12/20
At end of transfer, show how many files were or were not transferred
correctly.
-- --
internationalization
Change to using gettext(). Probably need to ship this for platforms
that don't have it.
Solicit translations.
Does anyone care? Before we bother modifying the code, we ought to
get the manual translated first, because that's possibly more useful
and at any rate demonstrates desire.
-- --
DEVELOPMENT --------------------------------------------------------
Handling duplicate names
Some folks would like rsync to be deterministic in how it handles
duplicate names that come from mering multiple source directories
into a single destination directory; e.g. the last name wins. We
could do this by switching our sort algorithm to one that will
guarantee that the names won't be reordered. Alternately, we could
assign an ever-increasing number to each item as we insert it into
the list and then make sure that we leave the largest number when
cleaning the file list (see clean_flist()). Another solution would
be to add a hash table, and thus never put any duplicate names into
the file list (and bump the protocol to handle this).
-- --
Use generic zlib 2002/02/25
Perhaps don't use our own zlib.
Advantages:
- will automatically be up to date with bugfixes in zlib
- can leave it out for small rsync on e.g. recovery disks
- can use a shared library
- avoids people breaking rsync by trying to do this themselves and
messing up
Should we ship zlib for systems that don't have it, or require
people to install it separately?
Apparently this will make us incompatible with versions of rsync
that use the patched version of rsync. Probably the simplest way to
do this is to just disable gzip (with a warning) when talking to old
versions.
-- --
Splint 2002/03/12
Build rsync with SPLINT to try to find security holes. Add
annotations as necessary. Keep track of the number of warnings
found initially, and see how many of them are real bugs, or real
security bugs. Knowing the percentage of likely hits would be
really interesting for other projects.
-- --
PERFORMANCE ----------------------------------------------------------
Allow skipping MD4 file_sum 2002/04/08
If we're doing a local transfer, or using -W, then perhaps don't
send the file checksum. If we're doing a local transfer, then
calculating MD4 checksums uses 90% of CPU and is unlikely to be
useful.
We should not allow it to be disabled separately from -W, though
as it is the only thing that lets us know when the rsync algorithm
got out of sync and messed the file up (i.e. if the basis file
changed between checksum generation and reception).
-- --
Accelerate MD4
Perhaps borrow an assembler MD4 from someone?
Make sure we call MD4 with properly-sized blocks whenever possible
to avoid copying into the residue region?
-- --
TESTING --------------------------------------------------------------
Torture test
Something that just keeps running rsync continuously over a data set
likely to generate problems.
-- --
Cross-test versions 2001/08/22
Part of the regression suite should be making sure that we
don't break backwards compatibility: old clients vs new
servers and so on. Ideally we would test both up and down
from the current release to all old versions.
Run current rsync versions against significant past releases.
We might need to omit broken old versions, or versions in which
particular functionality is broken
It might be sufficient to test downloads from well-known public
rsync servers running different versions of rsync. This will give
some testing and also be the most common case for having different
versions and not being able to upgrade.
The new --protocol option may help in this.
-- --
Test on kernel source
Download all versions of kernel; unpack, sync between them. Also
sync between uncompressed tarballs. Compare directories after
transfer.
Use local mode; ssh; daemon; --whole-file and --no-whole-file.
Use awk to pull out the 'speedup' number for each transfer. Make
sure it is >= x.
-- --
Test large files
Sparse and non-sparse
-- --
Create mutator program for testing
Insert bytes, delete bytes, swap blocks, ...
-- --
Create configure option to enable dangerous tests
-- --
Create pipe program for testing
Create pipe program that makes slow/jerky connections for
testing Versions of read() and write() that corrupt the
stream, or abruptly fail
-- --
Create test makefile target for some tests
Separate makefile target to run rough tests -- or perhaps
just run them every time?
-- --
RELATED PROJECTS -----------------------------------------------------
rsyncsh
Write a small emulation of interactive ftp as a Pythonn program
that calls rsync. Commands such as "cd", "ls", "ls *.c" etc map
fairly directly into rsync commands: it just needs to remember the
current host, directory and so on. We can probably even do
completion of remote filenames.
-- --
http://rsync.samba.org/rsync-and-debian/
-- --
rsyncable gzip patch
Exhaustive, tortuous testing
Cleanups?
-- --
rsyncsplit as alternative to real integration with gzip?
-- --
reverse rsync over HTTP Range
Goswin Brederlow suggested this on Debian; I think tridge and I
talked about it previous in relation to rproxy.
Addendum: It looks like someone is working on a version of this:
http://zsync.moria.org.uk/
-- --
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