software/kvm: support OS where 'python' command is not existing

This is the case in debian 11 when we don't have python2 installed.

software/kvm/buildout.hash.cfg

@@ -15,11 +15,11 @@
 
 [template]
 filename = instance.cfg.in
-md5sum = 7e90da1f6dac4233e1aa3248f48e357c
+md5sum = a7978940fb9cdcc4e1ec33015ba640ba
 
 [template-kvm]
 filename = instance-kvm.cfg.jinja2
-md5sum = ff9fb2378a48d1ca8c72f6a87d3a0221
+md5sum = 150285957daa256420d2d73519277420
 
 [template-kvm-cluster]
 filename = instance-kvm-cluster.cfg.jinja2.in
@@ -51,7 +51,7 @@ md5sum = e041e8011ad2ec7f104be173ef76f5e9
 
 [template-ansible-promise]
 filename = template/ansible-promise.in
-md5sum = a8cf453d20f01c707f02c4b4014580d8
+md5sum = 6328f99728284847b8dd1146aadeae1b
 
 [template-kvm-run]
 filename = template/template-kvm-run.in
@@ -78,16 +78,16 @@ filename = instance-kvm-http.cfg.in
 md5sum = 438192aab9f11e40dc521b46a4854dcf
 
 [image-download-controller]
-filename = template/image-download-controller.py
-md5sum = 3cc10323fd4d2db4cfbac536b66eae7c
+filename = template/image-download-controller.py.in
+md5sum = dc822ddd7dc987bf808a64a18ba11fd0
 
 [image-download-config-creator]
-filename = template/image-download-config-creator.py
-md5sum = 22ed19d9b8f7b983c97c52caa686bcd7
+filename = template/image-download-config-creator.py.in
+md5sum = b74b9d4829fe2c2f7122125cf87d29cd
 
 [whitelist-firewall-download-controller]
-filename = template/whitelist-firewall-download-controller.py
-md5sum = bc64e29546833817636261d1b28aa6dc
+filename = template/whitelist-firewall-download-controller.py.in
+md5sum = b4f6ffef08685bace1b9c01a3bd2620d
 
 [whitelist-domains-default]
 filename = template/whitelist-domains-default

software/kvm/instance-kvm.cfg.jinja2

@@ -1026,6 +1026,7 @@ extensions = jinja2.ext.do
 context =
   raw logs ${directory:public}/ansible
   raw name {{ name }}
+  raw python_executable ${buildout:executable}
 
 [ansible-vm-promise]
 <= monitor-promise-base

software/kvm/instance.cfg.in

@@ -83,9 +83,9 @@ extra-context =
   raw dcron_executable_location ${dcron:location}/sbin/crond
   raw debian_amd64_netinst_location ${debian-amd64-bullseye-netinst.iso:target}
   raw whitelist_domains_default ${whitelist-domains-default:target}
-  raw whitelist_firewall_download_controller ${whitelist-firewall-download-controller:target}
-  raw image_download_controller ${image-download-controller:target}
-  raw image_download_config_creator ${image-download-config-creator:target}
+  raw whitelist_firewall_download_controller ${whitelist-firewall-download-controller:output}
+  raw image_download_controller ${image-download-controller:output}
+  raw image_download_config_creator ${image-download-config-creator:output}
   raw logrotate_cfg ${template-logrotate-base:output}
   raw novnc_location ${noVNC:location}
   raw netcat_bin ${netcat:location}/bin/netcat

software/kvm/software.cfg

@@ -61,9 +61,16 @@ scripts =
 recipe = slapos.recipe.build:download
 url = ${:_profile_base_location_}/${:filename}
 
-[template]
+[template-base]
 recipe = slapos.recipe.template
 url = ${:_profile_base_location_}/${:filename}
+
+[template-base-python]
+<= template-base
+output = ${buildout:parts-directory}/${:_buildout_section_name_}/${:_buildout_section_name_}.py
+
+[template]
+<= template-base
 output = ${buildout:directory}/template.cfg
 
 [template-kvm]
@@ -118,13 +125,13 @@ context =
     key template_apache_conf template-apache-conf:target
 
 [image-download-controller]
-<= download-base
+<= template-base-python
 
 [image-download-config-creator]
-<= download-base
+<= template-base-python
 
 [whitelist-firewall-download-controller]
-<= download-base
+<= template-base-python
 
 [whitelist-domains-default]
 <= download-base

software/kvm/template/ansible-promise.in

-#!/usr/bin/env python
+#!{{ python_executable }}
 
 # Parse Ansible result log file and define if execution succeed or not
 

software/kvm/template/image-download-config-creator.py → software/kvm/template/image-download-config-creator.py.in

-#!/usr/bin/env python
+#!${buildout:executable}
 
 import hashlib
 import json

software/kvm/template/image-download-controller.py → software/kvm/template/image-download-controller.py.in

-#!/usr/bin/env python
+#!${buildout:executable}
 
 import hashlib
 import json

software/kvm/template/whitelist-firewall-download-controller.py → software/kvm/template/whitelist-firewall-download-controller.py.in

-#!/usr/bin/env python
+#!${buildout:executable}
 
 import os
 import subprocess