With this change, you can set
[web]
stripes=3
to get stripes every three lines (a-la fanfold paper), instead of every
line on source and directory listings. The default behaviour is stripes=1
which generates output similar to current, and you can also turn stripes
off by setting it to 0.
existing clone code uses pull to get changes from remote repo. is very
slow, uses lots of memory and cpu.
new clone code has server write file data straight to client, client
writes file data straight to disk. memory and cpu used are very low,
clone is much faster over lan.
new client can still clone with pull, can still clone from older servers.
new server can still serve older clients.
str.find return -1 when the substring is not found, -1 evaluate
to True and is a valid index, which can lead to bugs.
Using alternatives when possible makes the code clearer and less
prone to bugs. (and __contains__ is faster in microbenchmarks)
After the WSGI changes, even if a push over HTTP succeeds, apache
complains about "Premature end of script headers: hgwebdir.cgi" and
returns a "HTTP Error 500: Internal Server Error", making the local hg
abort.
The change to either of the files touched by this patch is enough to fix
this, but I think changing both is a more robust solution.
First, it changes the server to be almost a generic WSGI server.
Second, it changes request.py to have wsgiapplication and
_wsgirequest. wsgiapplication is a class that creates _wsgirequests
when called by a WSGI compliant server. It needs to know whether
or not it should create hgwebdir or hgweb requests.
Lastly, wsgicgi.py is added, and the CGI scripts are altered to
use it to launch wsgiapplications in a WSGI compliant way.
As a side effect, all the keepalive code has been removed from
request.py. This code needs to be moved so that it is exclusively
in server.py
new hgrc entries allow_push, deny_push, push_ssl control push over http.
allow_push list controls push. if empty or not set, no user can push.
if "*", any user (incl. unauthenticated user) can push. if list of user
names, only authenticated users in list can push.
deny_push list examined before allow_push. if "*", no user can push.
if list of user names, no unauthenticated user can push, and no users
in list can push.
push_ssl requires https connection for push. default is true, so password
sniffing can not be done.
only "hg serve" affected yet. http server running cgi script will not
use persistent connections. support for fastcgi will help that.
clients that support keepalive can use one tcp connection for all
commands during clone and pull. this makes latency of binary search
during pull much lower over wan.
if server does not know content-length, it will force connection to
close at end. right fix is to use chunked transfer-encoding but this is
easier and does not hurt performance. only command that is affected is
"changegroup" which is always last command during a pull.
