github: stop testing pg 9.6

PGHoard should still work with PG 9.3+, but since 9.6 is out of support
there's not much point in testing it for every PR anymore.

Also updated Python version references where applicable as we only test with
3.6 and newer.

.github/workflows/build.yml

@@ -54,7 +54,7 @@ jobs:
       max-parallel: 4
       matrix:
         python-version: [3.6, 3.7, 3.8, 3.9]
-        pg-version: [9.6, 10, 11, 12, 13, 14]
+        pg-version: [10, 11, 12, 13, 14]
 
     steps:
       - id: checkout-code

README.rst

@@ -78,9 +78,11 @@ if the host running PGHoard is incapacitated.
 Requirements
 ============
 
-PGHoard can backup and restore PostgreSQL versions 9.3 and above.  The
-daemon is implemented in Python and works with CPython version 3.5 or newer.
-The following Python modules are required:
+PGHoard can backup and restore PostgreSQL versions 9.3 and above, but is
+only tested and actively developed with version 10 and above.
+
+The daemon is implemented in Python and is tested and developed with version
+3.6 and above. The following Python modules are required:
 
 * psycopg2_ to look up transaction log metadata
 * requests_ for the internal client-server architecture

Vagrantfile

@@ -42,7 +42,7 @@ Vagrant.configure("2") do |config|
         sed -i "s/^#create_main_cluster.*/create_main_cluster=false/g" /etc/postgresql-common/createcluster.conf
 
         apt-get install -y python3.6 python3.6-dev python3.6-venv python3.7 python3.7-dev python3.7-venv python3.8 python3.8-dev python3.8-venv python3.9 python3.9-dev python3.9-venv
-        apt-get install -y postgresql-{9.6,10,11,12,13,14} postgresql-server-dev-{9.6,10,11,12,13,14}
+        apt-get install -y postgresql-{10,11,12,13,14} postgresql-server-dev-{10,11,12,13,14}
 
         username="$(< /dev/urandom tr -dc a-z | head -c${1:-32};echo;)"
         password=$(< /dev/urandom tr -dc _A-Z-a-z-0-9 | head -c${1:-32};echo;)

docs/development.rst

@@ -4,8 +4,12 @@ Development
 Requirements
 ------------
 
-PGHoard can backup and restore PostgreSQL versions 9.3 and above.  The
-daemon is implemented in Python and works with CPython version 3.5 or newer.
+PGHoard can backup and restore PostgreSQL versions 9.3 and above, but is
+only tested and actively developed with version 10 and above.
+
+The daemon is implemented in Python and is tested and developed with version
+3.6 and above. The following Python modules are required:
+
 The following Python modules are required:
 
 * psycopg2_ to look up transaction log metadata
@@ -50,25 +54,17 @@ Vagrant
 =======
 
 The Vagrantfile can be used to setup a vagrant development environment.   The vagrant environment has
-python 3.6, 3.7, 3.8 and 3.9 virtual environments and installations of postgresql 9.6, 10, 11 and 12.
+python 3.6, 3.7, 3.8 and 3.9 virtual environments and installations of postgresql 10 and newer.
 
 By default vagrant up will start a Virtualbox environment.   The Vagrantfile will also work for libvirt, just prefix
 VAGRANT_DEFAULT_PROVIDER=libvirt to the vagrant up command.
 
-Any combination of Python (3.6, 3.7 and 3.8) and Postgresql (9.6, 10, 11 and 12)
-
 Bring up vagrant instance and connect via ssh::
 
 vagrant up
 vagrant ssh
 vagrant@ubuntu2004:~$ cd /vagrant
 
-Test with Python 3.6 and Postgresql 9.6
-
-vagrant@ubuntu2004:~$ source ~/venv3.6/bin/activate
-vagrant@ubuntu2004:~$ PG_VERSION=9.6 make unittest
-vagrant@ubuntu2004:~$ deactivate
-
 Test with Python 3.7 and Postgresql 10
 
 vagrant@ubuntu2004:~$ source ~/venv3.7/bin/activate

pghoard.spec

@@ -5,11 +5,21 @@ Url:            http://github.com/aiven/pghoard
 Summary:        PostgreSQL streaming backup service
 License:        ASL 2.0
 Source0:        pghoard-rpm-src.tar
+Requires:       python3-botocore
+Requires:       python3-cryptography >= 0.8
+Requires:       python3-dateutil
+Requires:       python3-psycopg2
+Requires:       python3-pydantic
+Requires:       python3-requests
+Requires:       python3-snappy
+Requires:       python3-zstandard
 Requires:       systemd
-Requires:       python3-botocore, python3-cryptography >= 0.8, python3-dateutil
-Requires:       python3-psycopg2, python3-requests, python3-snappy, python3-zstandard, python3-pydantic,
-Conflicts:      pgespresso92 < 1.2, pgespresso93 < 1.2, pgespresso94 < 1.2, pgespresso95 < 1.2
-BuildRequires:  python3-flake8, python3-pytest, python3-pylint, python3-devel, golang
+Conflicts:      pgespresso93 < 1.2, pgespresso94 < 1.2, pgespresso95 < 1.2
+BuildRequires:  golang
+BuildRequires:  python3-devel
+BuildRequires:  python3-flake8
+BuildRequires:  python3-pylint
+BuildRequires:  python3-pytest
 
 %undefine _missing_build_ids_terminate_build
 %define debug_package %{nil}