parallel downloads while doing zypper distribution upgrade

zypper_dup_print_urls.py

#!/usr/bin/env python2

"""
This script will print package urls which need to be downloaded for 'distrubution upgrade'
Printed urls can be used for downloading packages in parallel.
For eg: we can use GNU parallel commanline tool along with wget/curl for parallel downloading

python2 zypper_dup_print_urls.py | parallel --tmuxpane -j4 --colsep ' '  mkdir -p '{1}/{2}' \; cd '{1}/{2}' \;  wget -c {3}
will download packages with 4 simultaneous downloads
"""

import os
import zypp

def initRepos():
    repoManager = zypp.RepoManager()
    repos = repoManager.knownRepositories()
    for repo in repos:
        if not repo.enabled():
            continue
        if not repoManager.isCached( repo ):
            repoManager.buildCache( repo )
        repoManager.loadFromCache( repo );


def initZypp():
    Z = zypp.ZYppFactory_instance().getZYpp()
    Z.initializeTarget( zypp.Pathname("/") )
    Z.target().load();
    initRepos()
    return Z


def tryDUP( res ):
    hasProblems = res.doUpgrade()
    if( hasProblems ):
        return;

    prs = res.problems()
    probSols = zypp.ProblemSolutionList()
    for i in prs:
        #  Just choose first solution
        probSols.push_back( i.solutions()[0] )
    res.applySolutions( probSols )
    tryDUP( res )


Z = initZypp()
tryDUP( Z.resolver() )

todo = zypp.GetResolvablesToInsDel( Z.pool() )
urlList = []
for item in todo._toInstall:
    repoUrl = item.repoInfo().baseUrls()[0].asCompleteString()
    if( 'CHECK_BUG' in os.environ ):
        itemUrl = str( item.lookupLocation().filename() )
    else:
        r=item.lookupLocation(); itemUrl = str( r.filename() )
    url = repoUrl + itemUrl
    urlList.append( url )
    arch = '---'
    if zypp.Arch.x86_64() == item.arch():
        arch = 'x86_64'
    elif zypp.Arch.noarch() == item.arch():
        arch = 'noarch'
    elif zypp.Arch.i386() == item.arch():
        arch = 'i386'
    print item.repoInfo().alias(), arch, url

Two questions:

• what do I need to have installed to be able to do import zypp?
• where should I download this to so that zypper can use it in the next run?

@jpluimers

• what do I need to have installed to be able to do import zypp?

Python ( and many other language bindings ) for zypper comes under this project. https://github.com/openSUSE/libzypp-bindings. You need to

• build that project yourself
• set PYTHONPATH properly so that import zypp will work.

• where should I download this to so that zypper can use it in the next run?

Zypper can not use this script. This script is using zypper ( to be exact, the libzypp library. not the zypper cli tool )