annotate contrib/win32/mercurial.ini @ 27142:060f83d219b9

extensions: refuse to load extensions if minimum hg version not met

As the author of several 3rd party extensions, I frequently see bug
reports from users attempting to run my extension with an old version
of Mercurial that I no longer support in my extension. Oftentimes, the
extension will import just fine. But as soon as we run extsetup(),
reposetup(), or get into the guts of a wrapped function, we encounter
an exception and abort. Today, Mercurial will print a message about
extensions that don't have a "testedwith" declaring explicit
compatibility with the current version.

The existing mechanism is a good start. But it isn't as robust as I
would like. Specifically, Mercurial assumes compatibility by default.
This means extension authors must perform compatibility checking in
their extsetup() or we wait and see if we encounter an abort at
runtime. And, compatibility checking can involve a lot of code and
lots of error checking. It's a lot of effort for extension authors.

Oftentimes, extension authors know which versions of Mercurial there
extension works on and more importantly where it is broken.

This patch introduces a magic "minimumhgversion" attribute in
extensions. When found, the extension loading mechanism will compare
the declared version against the current Mercurial version. If the
extension explicitly states we require a newer Mercurial version, a
warning is printed and the extension isn't loaded beyond importing
the Python module. This causes a graceful failure while alerting
the user of the compatibility issue.

I would be receptive to the idea of making the failure more fatal.
However, care would need to be taken to not criple every hg command.
e.g. the user may use `hg config` to fix the hgrc and if we aborted
trying to run that, the user would effectively be locked out of `hg`!

A potential future improvement to this functionality would be to catch
ImportError for the extension/module and parse the source code for
"minimumhgversion = 'XXX'" and do similar checking. This way we could
give more information about why the extension failed to load.

; System-wide Mercurial config file.
;
; !!!  Do Not Edit This File !!!
;
; This file will be replaced by the installer on every upgrade.
; Editing this file can cause strange side effects on Vista.
;
; http://bitbucket.org/tortoisehg/stable/issue/135
;
; To change settings you see in this file, override (or enable) them in
; your user Mercurial.ini file, where USERNAME is your Windows user name:
;
; XP or older    - C:\Documents and Settings\USERNAME\Mercurial.ini
; Vista or later - C:\Users\USERNAME\Mercurial.ini


[ui]
; editor used to enter commit logs, etc.  Most text editors will work.
editor = notepad
; show changed files and be a bit more verbose if True
; verbose = True
 
; username data to appear in commits
; it usually takes the form: Joe User <[e-mail]>
; username = Joe User <[e-mail]>

; In order to push/pull over ssh you must specify an ssh tool
;ssh = "C:\Progra~1\TortoiseSVN\bin\TortoisePlink.exe" -ssh -2
;ssh = C:\cygwin\bin\ssh

;
; For more information about mercurial extensions, start here
; http://www.selenic.com/mercurial/wiki/index.cgi/UsingExtensions
;
; Extensions shipped with Mercurial
;
[extensions]
;acl =
;blackbox =
;bugzilla =
;children =
;churn =
;color =
;convert =
;eol =
;extdiff =
;fetch =
;gpg =
;hgcia =
;hgk =
;highlight = 
;histedit =
;interhg =
;largefiles =
;keyword =
;mq =
;notify =
;pager =
;patchbomb =
;progress =
;purge =
;rebase =
;record =
;relink =
;schemes =
;share =
;shelve =
;transplant =
;win32mbcs =
;zeroconf =

;
; Define external diff commands
;
[extdiff]
;cmd.bc3diff = C:\Program Files\Beyond Compare 3\BCompare.exe
;cmd.vdiff = C:\Progra~1\TortoiseSVN\bin\TortoiseMerge.exe
;cmd.vimdiff = gvim.exe
;opts.vimdiff = -f "+next" "+execute 'DirDiff' fnameescape(argv(0)) fnameescape(argv(1))"


[hgk]
; Replace the following with your path to hgk, uncomment it and 
; install ActiveTcl (or another win32 port like tclkit)
; path="C:\Program Files\Mercurial\Contrib\hgk.tcl"
; vdiff=vdiff
 

;
; The git extended diff format can represent binary files, file
; permission changes, and rename information that the normal patch format
; cannot describe.  However it is also not compatible with tools which
; expect normal patches. so enable git patches at your own risk.
;
[diff]
;git = false
;nodates = false