[Python-apps-team] Bug#961245: mercurial-common: trying to overwrite '/usr/lib/python2.7/dist-packages/hgext/git/__init__.py', which is also in package mercurial-git 0.8.12-1.2

[Jakub Wilk]

* Axel Beckert <abe at debian.org>, 2020-05-22, 00:22:
>dpkg: error processing archive /var/cache/apt/archives/mercurial-common_5.4-1_all.deb (--unpack):
> trying to overwrite '/usr/lib/python2.7/dist-packages/hgext/git/__init__.py', which is also in package mercurial-git 0.8.12-1.2
>dpkg-deb: error: paste subprocess was killed by signal (Broken pipe)
>Errors were encountered while processing:
> /var/cache/apt/archives/mercurial-common_5.4-1_all.deb

Note that there's no such conflict upstream, because hg-git installs the 
module as "hggit" (not in the "hgext" namespace).

This mess is my fault. When I packaged hg-git in 2009, it was so 
immature it didn't even have installation scripts. Instead their README 
said:

>Clone this repository somewhere and make the 'extensions' section in 
>your `~/.hgrc` file look something like this:
>
>    [extensions]
>    hgext.bookmarks =
>    hgext.hg-git = [path-to]/hg-git

I decided to install it as a public module "hgext.git", without even 
talking to upstream. In retrospect, it was a terrible idea. :-(

Ideally this should be fixed by renaming the hg-git's module back to 
what upstream uses. But of course this is going to break all hg-git 
users' configurations. :-/

-- 
Jakub Wilk