Gustavo Sverzut Barbieri

So I was helping one Canola2 user to uninstall the old version and for some strange reason apt-get remove libeet0 libevas0 libecore0 libembryo0 libdownloadmanager0 was breaking with “Abort” message. Ok, use dpkg instead, I said, but since we now have split packages for all the libs we use, you’ll end with a dependency nightmare.

Solution? Hack a quick script to get dpkg errors, parse them and generate a new command line with proper ordering:

#!/usr/bin/python

import sys

pkgs = {}

infile = open(sys.argv[1])
pkg = None
for line in infile:
    line = line[:-1] # chomp n
    tokens = line.split()
    head = tokens[0]
    if head == "dpkg:":
        if tokens[1] != "dependency":
            continue
        pkg = tokens[-1][:-1]
        pkgs.setdefault(pkg, set())
    elif head in ("Package", "dpkg", "dependency"):
        continue
    elif head == "Errors":
        break # follows a list of problematic packages
    else:
        if tokens[1:3] == ['depends', 'on']:
            pkgs[pkg].add(head)

def unique_extend(lst, extent):
    for e in extent:
        if e not in lst:
            lst.append(e)

def rm_pkg(p, pkgs):
    rm_list = []
    try:
        ddeps = pkgs[p]
    except KeyError:
        return [] # no deps!

    for d in ddeps:
        unique_extend(rm_list, rm_pkg(d, pkgs) + [d])
    return rm_list

rm_list = []
for p in pkgs:
    unique_extend(rm_list, rm_pkg(p, pkgs) + [p])

print "dpkg --purge", " ".join(rm_list)

Not that efficient, but simple enough.

After another heavy working week, we managed to deliver a new beta of Canola2, this time with lots of bug fixing (thanks for reporting!), features and optimizations. Also features 770* support, a new tool to merge albums (collections or albums with similar name) and lots of new media formats (wma/wmv and real media included!).

UPDATE: Since we replaced our download manager, previous packages conflicts! Please remove Canola2-beta1 before installing the new one. If you got it wrong, apt-get -f install from Xterm should fix it.

Hope installation will be smoother this time!

More information at: http://openbossa.indt.org/canola2/

* 770 support: gregale is regular install, but for Hacker Edition (bora ported to 770) you need a special proceeding (ain’t you hackers!?):

1. disable all repositories
2. add the repositories:
   1. deb http://repository.maemo.org gregale free non-free
   2. deb http://repository.maemo.org/extras gregale free non-free
3. update list
4. install canola2
5. remove gregale repositories

These steps are required because Hacker Edition kernel doesn’t provide inotify and we compile bora EFL packages optimized for n8xx (omap 2420, arm1136jf-s).