view tests/test-newercgi.t @ 12938:bf826c0b9537 stable

opener: check hardlink count reporting (issue1866)

The Linux CIFS kernel driver (even in 2.6.36) suffers from a hardlink
count blindness bug (lstat() returning 1 in st_nlink when it is expected
to return >1), which causes repository corruption if Mercurial running
on Linux pushes or commits to a hardlinked repository stored on a Windows
share, if that share is mounted using the CIFS driver.

This patch works around issue1866 and improves the workaround done in
50523b4407f6 to fix issue761, by teaching the opener to lazily execute a
runtime check (new function checknlink) to see if the hardlink count
reported by nlinks() can be trusted.

Since nlinks() is also known to return varying count values (1 or >1)
depending on whether the file is open or not and depending on what client
and server software combination is being used for accessing and serving
the Windows share, we deliberately open the file before calling nlinks() in
order to have a stable precondition. Trying to depend on the precondition
"file closed" would be fragile, as the file could have been opened very
easily somewhere else in the program.

This is a rudimentary test of the CGI files as of d74fc8dec2b4.

  $ hg init test

  $ cat >hgweb.cgi <<HGWEB
  > #!/usr/bin/env python
  > #
  > # An example CGI script to use hgweb, edit as necessary
  > 
  > import cgitb
  > cgitb.enable()
  > 
  > from mercurial import demandimport; demandimport.enable()
  > from mercurial.hgweb import hgweb
  > from mercurial.hgweb import wsgicgi
  > 
  > application = hgweb("test", "Empty test repository")
  > wsgicgi.launch(application)
  > HGWEB

  $ chmod 755 hgweb.cgi

  $ cat >hgweb.config <<HGWEBDIRCONF
  > [paths]
  > test = test
  > HGWEBDIRCONF

  $ cat >hgwebdir.cgi <<HGWEBDIR
  > #!/usr/bin/env python
  > #
  > # An example CGI script to export multiple hgweb repos, edit as necessary
  > 
  > import cgitb
  > cgitb.enable()
  > 
  > from mercurial import demandimport; demandimport.enable()
  > from mercurial.hgweb import hgwebdir
  > from mercurial.hgweb import wsgicgi
  > 
  > application = hgwebdir("hgweb.config")
  > wsgicgi.launch(application)
  > HGWEBDIR

  $ chmod 755 hgwebdir.cgi

  $ DOCUMENT_ROOT="/var/www/hg"; export DOCUMENT_ROOT
  $ GATEWAY_INTERFACE="CGI/1.1"; export GATEWAY_INTERFACE
  $ HTTP_ACCEPT="text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5"; export HTTP_ACCEPT
  $ HTTP_ACCEPT_CHARSET="ISO-8859-1,utf-8;q=0.7,*;q=0.7"; export HTTP_ACCEPT_CHARSET
  $ HTTP_ACCEPT_ENCODING="gzip,deflate"; export HTTP_ACCEPT_ENCODING
  $ HTTP_ACCEPT_LANGUAGE="en-us,en;q=0.5"; export HTTP_ACCEPT_LANGUAGE
  $ HTTP_CACHE_CONTROL="max-age=0"; export HTTP_CACHE_CONTROL
  $ HTTP_CONNECTION="keep-alive"; export HTTP_CONNECTION
  $ HTTP_HOST="hg.omnifarious.org"; export HTTP_HOST
  $ HTTP_KEEP_ALIVE="300"; export HTTP_KEEP_ALIVE
  $ HTTP_USER_AGENT="Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.8.0.4) Gecko/20060608 Ubuntu/dapper-security Firefox/1.5.0.4"; export HTTP_USER_AGENT
  $ PATH_INFO="/"; export PATH_INFO
  $ PATH_TRANSLATED="/var/www/hg/index.html"; export PATH_TRANSLATED
  $ QUERY_STRING=""; export QUERY_STRING
  $ REMOTE_ADDR="127.0.0.2"; export REMOTE_ADDR
  $ REMOTE_PORT="44703"; export REMOTE_PORT
  $ REQUEST_METHOD="GET"; export REQUEST_METHOD
  $ REQUEST_URI="/test/"; export REQUEST_URI
  $ SCRIPT_FILENAME="/home/hopper/hg_public/test.cgi"; export SCRIPT_FILENAME
  $ SCRIPT_NAME="/test"; export SCRIPT_NAME
  $ SCRIPT_URI="http://hg.omnifarious.org/test/"; export SCRIPT_URI
  $ SCRIPT_URL="/test/"; export SCRIPT_URL
  $ SERVER_ADDR="127.0.0.1"; export SERVER_ADDR
  $ SERVER_ADMIN="eric@localhost"; export SERVER_ADMIN
  $ SERVER_NAME="hg.omnifarious.org"; export SERVER_NAME
  $ SERVER_PORT="80"; export SERVER_PORT
  $ SERVER_PROTOCOL="HTTP/1.1"; export SERVER_PROTOCOL
  $ SERVER_SIGNATURE="<address>Apache/2.0.53 (Fedora) Server at hg.omnifarious.org Port 80</address>"; export SERVER_SIGNATURE
  $ SERVER_SOFTWARE="Apache/2.0.53 (Fedora)"; export SERVER_SOFTWARE

  $ python hgweb.cgi > page1
  $ python hgwebdir.cgi > page2

  $ PATH_INFO="/test/"
  $ PATH_TRANSLATED="/var/something/test.cgi"
  $ REQUEST_URI="/test/test/"
  $ SCRIPT_URI="http://hg.omnifarious.org/test/test/"
  $ SCRIPT_URL="/test/test/"

  $ python hgwebdir.cgi > page3

  $ grep -i error page1 page2 page3
  [1]