git-commit-vandalism/contrib
Colby Ranger fe0435011c Add persistent-https to contrib
Git over HTTPS has a high request startup latency, since the SSL
negotiation can take up to a second. In order to reduce this latency,
connections should be left open to the Git server across requests
(or invocations of the git commandline).

Reduce SSL startup latency by running a daemon job that keeps
connections open to a Git server. The daemon job
(git-remote-persistent-https--proxy) is started on the first request
through the client binary (git-remote-persistent-https) and remains
running for 24 hours after the last request, or until a new daemon
binary is placed in the PATH. The client determines the daemon's
HTTP address by communicating over a UNIX socket with the daemon.
From there, the rest of the Git protocol work is delegated to the
"git-remote-http" binary, with the environment's http_proxy set to
the daemon.

Accessing /pub/scm/linux/kernel/git/torvalds/linux repository hosted
at kernel.googlesource.com with "git ls-remote" over https:// and
persistent-https:// 5 times shows that the first request takes about
the same time (0.193s vs 0.208s---there is a slight set-up cost for
the local proxy); as expected, the other four requests are much
faster (~0.18s vs ~0.08s).

Incidentally, this also has the benefit of HTTP keep-alive working
across Git command invocations. Its common for servers to use a 5
minute keep-alive on an HTTP 1.1 connection. Git-over-HTTP commonly
uses Transfer-Encoding: chunked on replies, so keep-alive will
generally just work, even though a pack stream's length isn't known
in advance. Because the helper is an external process holding that
connection open, we also benefit from being able to reuse an
existing TCP connection to the server.  The same "git ls-remote"
test against http:// vs persistent-https:// URL shows that the
former takes ~0.09s while the first request for the latter is about
0.134s with set-up cost, and subsequent requests are ~0.065s,
shaving around one RTT to the server.

Signed-off-by: Colby Ranger <cranger@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2012-05-30 13:50:45 -07:00
..
blameview War on whitespace 2007-06-07 00:04:01 -07:00
buildsystems msvc: Fix an "unrecognized option" linker warning 2010-01-22 16:15:14 -08:00
ciabot contrib/ciabot: git-describe commit instead of HEAD 2010-10-29 14:09:48 -07:00
completion Merge branch 'fc/git-complete-helper' 2012-05-17 15:21:55 -07:00
continuous
convert-objects Documentation: use [verse] for SYNOPSIS sections 2011-07-06 14:26:26 -07:00
credential/osxkeychain contrib: add credential helper for OS X Keychain 2011-12-12 16:09:39 -08:00
diff-highlight diff-highlight: document some non-optimal cases 2012-02-13 15:57:07 -08:00
diffall contrib/diffall: fix cleanup trap on Windows 2012-03-14 15:22:38 -07:00
emacs git.el: Don't use font-lock-compile-keywords 2011-04-03 11:08:54 -07:00
examples remove superfluous newlines in error messages 2012-04-30 15:45:51 -07:00
fast-import git-p4: move to toplevel 2012-04-09 14:59:40 -07:00
git-jump contrib: add git-jump script 2011-10-21 13:55:59 -07:00
git-shell-commands Add sample commands for git-shell 2010-08-12 15:16:31 -07:00
gitview Documentation: use [verse] for SYNOPSIS sections 2011-07-06 14:26:26 -07:00
hg-to-git Correct references to /usr/bin/python which does not exist on FreeBSD 2010-03-24 14:33:54 -07:00
hooks post-receive-email: match up $LOGBEGIN..$LOGEND pairs correctly 2012-02-27 11:01:16 -08:00
mw-to-git git-remote-mediawiki: don't include HTTP login/password in author 2011-10-20 10:17:14 -07:00
p4import Correct references to /usr/bin/python which does not exist on FreeBSD 2010-03-24 14:33:54 -07:00
patches INSTALL: add warning on docbook-xsl 1.72 and 1.73 2007-08-04 01:55:08 -07:00
persistent-https Add persistent-https to contrib 2012-05-30 13:50:45 -07:00
stats contrib: update packinfo.pl to not use dashed commands 2008-10-18 06:20:27 -07:00
subtree Fix git-subtree install instructions 2012-04-09 22:26:19 -05:00
svn-fe correct spelling: an URL -> a URL 2012-03-28 08:47:23 -07:00
thunderbird-patch-inline contrib/thunderbird-patch-inline: do not require bash to run the script 2011-03-30 12:29:39 -07:00
vim contrib/vim: change URL to point to the latest syntax files 2009-01-12 23:36:03 -08:00
workdir prefer test -h over test -L in shell scripts 2010-09-27 10:48:23 -07:00
git-resurrect.sh request-pull: protect against OPTIONS_KEEPDASHDASH from environment 2010-05-01 11:02:21 -07:00
README War on whitespace 2007-06-07 00:04:01 -07:00
remotes2config.sh contrib: Make remotes2config.sh script more robust 2007-12-04 14:35:08 -08:00
rerere-train.sh contrib/rerere-train: use installed git-sh-setup 2012-04-30 12:50:38 -07:00

Contributed Software

Although these pieces are available as part of the official git
source tree, they are in somewhat different status.  The
intention is to keep interesting tools around git here, maybe
even experimental ones, to give users an easier access to them,
and to give tools wider exposure, so that they can be improved
faster.

I am not expecting to touch these myself that much.  As far as
my day-to-day operation is concerned, these subdirectories are
owned by their respective primary authors.  I am willing to help
if users of these components and the contrib/ subtree "owners"
have technical/design issues to resolve, but the initiative to
fix and/or enhance things _must_ be on the side of the subtree
owners.  IOW, I won't be actively looking for bugs and rooms for
enhancements in them as the git maintainer -- I may only do so
just as one of the users when I want to scratch my own itch.  If
you have patches to things in contrib/ area, the patch should be
first sent to the primary author, and then the primary author
should ack and forward it to me (git pull request is nicer).
This is the same way as how I have been treating gitk, and to a
lesser degree various foreign SCM interfaces, so you know the
drill.

I expect that things that start their life in the contrib/ area
to graduate out of contrib/ once they mature, either by becoming
projects on their own, or moving to the toplevel directory.  On
the other hand, I expect I'll be proposing removal of disused
and inactive ones from time to time.

If you have new things to add to this area, please first propose
it on the git mailing list, and after a list discussion proves
there are some general interests (it does not have to be a
list-wide consensus for a tool targeted to a relatively narrow
audience -- for example I do not work with projects whose
upstream is svn, so I have no use for git-svn myself, but it is
of general interest for people who need to interoperate with SVN
repositories in a way git-svn works better than git-svnimport),
submit a patch to create a subdirectory of contrib/ and put your
stuff there.

-jc