Add 'pythonz' logic, for installing arbitrary versions of python

rattail_fabric2/python.py

@@ -2,7 +2,7 @@
 ################################################################################
 #
 #  Rattail -- Retail Software Framework
-#  Copyright © 2010-2019 Lance Edgar
+#  Copyright © 2010-2020 Lance Edgar
 #
 #  This file is part of Rattail.
 #
@@ -55,6 +55,35 @@ def bootstrap_python(c, pip_from_apt=True, workon_home='/srv/envs', user='rattai
     deploy(c, 'python/premkvirtualenv', '{}/premkvirtualenv'.format(workon_home), owner=user, use_sudo=True)
 
 
+def install_pythonz(c):
+    """
+    Install the 'pythonz' utility, for installing arbitrary versions of python.
+
+    https://github.com/saghul/pythonz/blob/master/README.rst#installation
+    """
+    apt.install(
+        c,
+        'curl',
+        'zlib1g-dev', # seems to be needed when building python
+    )
+    if not exists(c, '/usr/local/pythonz'):
+        if not exists(c, '/usr/local/src/pythonz'):
+            mkdir(c, '/usr/local/src/pythonz', use_sudo=True)
+        if not exists(c, '/usr/local/src/pythonz/pythonz-install'):
+            c.sudo('curl -kL -o /usr/local/src/pythonz/pythonz-install https://raw.github.com/saghul/pythonz/master/pythonz-install')
+            c.sudo('chmod +x /usr/local/src/pythonz/pythonz-install')
+        c.sudo('/usr/local/src/pythonz/pythonz-install')
+
+
+def install_python(c, version, verbose=False):
+    """
+    Install a specific version of python, via pythonz.
+    """
+    if not exists(c, '/usr/local/pythonz/pythons/CPython-{}'.format(version)):
+        verbose = '--verbose' if verbose else ''
+        c.sudo("bash -lc 'pythonz install {} {}'".format(verbose, version))
+
+
 def install_pip(c, use_apt=False, eager=True):
     """
     Install/upgrade the Pip installer for Python.