[Spacewalk-list] Spacewalk 2.7 && Ubuntu 15.04 && Debian 9 [ working solution ]

[Florin]

So, finally after so much trial and error here is what I've done to 
allow smooth integration of Debian 9 and Ubuntu 16.0 with spacewalk

Just to keep it simple

1. create channels: xenial-main + xenial-updates, xenial-security, 
xenial-universe

2. tricky part  syncing channels [ adding multi-arch header]:

#!/bin/bash

_BIN_PATH=/var/www/html/pub/spw_scripts
_URL_MAIN='http://de.archive.ubuntu.com/ubuntu/dists/xenial/main/binary-amd64'
_URL_SEC='http://us.archive.ubuntu.com/ubuntu/dists/xenial-security/main/binary-amd64'
_URL_UPD='http://de.archive.ubuntu.com/ubuntu/dists/xenial-updates/main/binary-amd64'
_URL_UNIV='http://de.archive.ubuntu.com/ubuntu/dists/xenial/universe/binary-amd64'
_PKG_MAIN=/var/cache/rhn/repodata/xenial-main
_PKG_SEC=/var/cache/rhn/repodata/xenial-security
_PKG_UPD=/var/cache/rhn/repodata/xenial-updates
_PKG_UNIV=/var/cache/rhn/repodata/xenial-universe
_USER=bugs
_PASS=bunny

$_BIN_PATH/spacewalk-debian-sync.pl  --url $_URL_MAIN --channel 
xenial-main        --username=$_USER  --password $_PASS
$_BIN_PATH/spacewalk-debian-sync.pl  --url $_URL_SEC  --channel 
xenial-security     --username=$_USER  --password $_PASS
$_BIN_PATH/spacewalk-debian-sync.pl  --url $_URL_UPD  --channel 
xenial-updates    --username=$_USER  --password $_PASS
$_BIN_PATH/spacewalk-debian-sync.pl  --url $_URL_UNIV  --channel 
xenial-universe  --username=$_USER  --password $_PASS

s=180
trap 'echo "Ctrl-C detected."' 2
for (( i=$s ; i>0; i--));
         do
                 echo -ne  "\rFinishing sync in: $i seconds\033[0K"; sleep 1
         done
echo -e "\nSync completed!"
trap 2
$_BIN_PATH/spacewalk-add-debian-multiarch-header.py $_PKG_MAIN/Packages  
/tmp/xenial-main
$_BIN_PATH/spacewalk-add-debian-multiarch-header.py 
$_PKG_SEC/Packages    /tmp/xenial-security
$_BIN_PATH/spacewalk-add-debian-multiarch-header.py $_PKG_UPD/Packages   
/tmp/xenial-updates
$_BIN_PATH/spacewalk-add-debian-multiarch-header.py $_PKG_UNIV/Packages  
/tmp/xenial-universe

                 /bin/mv $_PKG_MAIN/Packages.new $_PKG_MAIN/Packages
                 /bin/mv $_PKG_SEC/Packages.new $_PKG_SEC/Packages
                 /bin/mv $_PKG_UPD/Packages.new $_PKG_UPD/Packages
                 /bin/mv $_PKG_UNIV/Packages.new $_PKG_UNIV/Packages

                 gzip < $_PKG_MAIN/Packages > $_PKG_MAIN/Packages.gz
                 gzip < $_PKG_SEC/Packages > $_PKG_SEC/Packages.gz
                 gzip < $_PKG_UPD/Packages > $_PKG_UPD/Packages.gz
                 gzip < $_PKG_UNIV/Packages > $_PKG_UNIV/Packages.gz

3. client side  [ ubuntu/debian clients]

spw_srv=192.168.100.101

cat >/etc/apt/apt.conf.d/50spacewalk<<FIX
#
# The configuration for apt-spacewalk
#
APT {
   Update {
         List-Refresh "true";
         Pre-Invoke {
             "/usr/lib/apt-spacewalk/pre_invoke.py";
         }
         Post-Invoke {
             "/bin/sed -rie 's/^Package: 
(cpp|guile-2.0|python(2.7|3)?)$/\0\nMulti-Arch: allowed/' 
/var/lib/apt/lists/${spw_srv}_dists_channels\:_xenial-main_binary-amd64_Packages";
         }
   }
};
DPkg::Post-Invoke {
     "[ ! -e /usr/lib/apt-spacewalk/post_invoke.py ] || 
/usr/lib/apt-spacewalk/post_invoke.py";
};
FIX
sed  -i "s|'main'|'xenial-main'|g" /usr/lib/apt-spacewalk/pre_invoke.py
perl -pi -e "s/type='deb'/type='deb [trusted=yes] '/g" 
/usr/lib/apt-spacewalk/pre_invoke.py

4. Now can perform apt-get update/upgrade w/o any issues after disabling 
/etc/apt/source.list