def start(self, metalinks=None):
""" Begin download """
if metalinks:
self.metalinks = metalinks
# Create downloads list from package list
if self.metalinks is None:
self.create_metalinks_list()
if self.metalinks is None:
# Still None? Error!
txt = _("Can't create download package list.")
raise misc.InstallError(txt)
download = download_requests.Download(self.pacman_cache_dir,
self.xz_cache_dirs,
self.callback_queue)
if not download.start(self.metalinks):
# When we can't download (even one package), we stop right here
txt = _("Can't download needed packages. Cnchi can't continue.")
raise misc.InstallError(txt)
def create_metalinks_list(self):
""" Create metalinks list """
self.pkg = pack.SelectPackages(self.settings, self.callback_queue)
self.pkg.create_package_list()
if not self.pkg.packages:
txt = _("Cannot create package list.")
raise misc.InstallError(txt)
# Won't download anything here. It's just to create the metalinks list
self.down = download.DownloadPackages(
package_names=self.pkg.packages,
pacman_conf_file='/etc/pacman.conf',
pacman_cache_dir='/var/cache/pacman/pkg',
settings=self.settings,
callback_queue=self.callback_queue)
# Create metalinks list
self.down.create_metalinks_list()
if not self.down.metalinks:
txt = _("Cannot create download package list (metalinks).")
raise misc.InstallError(txt)
def create_metalinks_list(self):
""" Creates a downloads list (metalinks) from the package list """
self.queue_event('percent', '0')
self.queue_event('info', _('Creating the list of packages to download...'))
processed_packages = 0
total_packages = len(self.package_names)
self.metalinks = {}
try:
pacman = pac.Pac(
conf_path=self.pacman_conf_file,
callback_queue=self.callback_queue)
if pacman is None:
return None
except Exception as ex:
self.metalinks = None
template = "Can't initialize pyalpm. An exception of type {0} occured. Arguments:\n{1!r}"
message = template.format(type(ex).__name__, ex.args)
logging.error(message)
return
try:
for package_name in self.package_names:
metalink = ml.create(pacman, package_name, self.pacman_conf_file)
if metalink is None:
txt = "Error creating metalink for package %s. Installation will stop"
logging.error(txt, package_name)
txt = _("Error creating metalink for package {0}. "
"Installation will stop").format(package_name)
raise misc.InstallError(txt)
# Get metalink info
metalink_info = ml.get_info(metalink)
# Update downloads list with the new info from
# the processed metalink
for key in metalink_info:
if key not in self.metalinks:
self.metalinks[key] = metalink_info[key]
urls = metalink_info[key]['urls']
if self.settings:
# Sort urls based on the mirrorlist
# we created earlier
sorted_urls = sorted(
urls,
key=self.url_sort_helper)
self.metalinks[key]['urls'] = sorted_urls
else:
# When testing, settings is not available
self.metalinks[key]['urls'] = urls
# Show progress to the user
processed_packages += 1
percent = round(float(processed_packages / total_packages), 2)
self.queue_event('percent', str(percent))
except Exception as ex:
template = "Can't create download set. An exception of type {0} occured. Arguments:\n{1!r}"
message = template.format(type(ex).__name__, ex.args)
logging.error(message)
self.metalinks = None
return
try:
pacman.release()
del pacman
except Exception as ex:
self.metalinks = None
template = "Can't release pyalpm. An exception of type {0} occured. Arguments:\n{1!r}"
message = template.format(type(ex).__name__, ex.args)
logging.error(message)
return
# Overwrite last event (to clean up the last message)
self.queue_event('info', "")