From be5e689cac62bb9936ec9f32837843c37a2a560a Mon Sep 17 00:00:00 2001
From: Andrew Fyfe <andrew@neptune-one.net>
Date: Mon, 19 Mar 2018 18:32:45 +0000
Subject: [PATCH] remove dependency on pip internals

closes #1438
---
 dev-requirements.txt            |  1 +
 modoboa/core/commands/deploy.py | 17 +++++++----------
 setup.py                        | 18 +++++++++---------
 test-requirements.txt           |  1 +
 4 files changed, 18 insertions(+), 19 deletions(-)

diff --git a/dev-requirements.txt b/dev-requirements.txt
index 06d73f33c..e2dd90121 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -1,2 +1,3 @@
 django-bower
 django-debug-toolbar
+packaging
diff --git a/modoboa/core/commands/deploy.py b/modoboa/core/commands/deploy.py
index 791447d39..3dcfc0ccb 100644
--- a/modoboa/core/commands/deploy.py
+++ b/modoboa/core/commands/deploy.py
@@ -22,13 +22,7 @@ from django.utils.six.moves import input
 
 from modoboa.core.commands import Command
 from modoboa.lib.api_client import ModoAPIClient
-
-try:
-    import pip
-except ImportError:
-    sys.stderr.write("Error: pip is required to install extensions.\n")
-    sys.exit(2)
-
+from modoboa.lib.sysutils import exec_cmd
 
 DBCONN_TPL = """
     '{{ conn_name }}': {
@@ -226,9 +220,12 @@ class DeployCommand(Command):
             extensions = [(extension, extension.replace("-", "_"))
                           for extension in extensions]
             if not parsed_args.dont_install_extensions:
-                pip_args = (
-                    ["install"] + [extension[0] for extension in extensions])
-                pip.main(pip_args)
+                cmd = (
+                    sys.executable +
+                    " -m pip install " +
+                    " ".join([extension[0] for extension in extensions])
+                )
+                exec_cmd(cmd, capture_output=False)
             extra_settings = self.find_extra_settings(extensions)
             extensions = [extension[1] for extension in extensions]
 
diff --git a/setup.py b/setup.py
index 43abc5c05..3a7a3737d 100644
--- a/setup.py
+++ b/setup.py
@@ -13,21 +13,21 @@ from __future__ import unicode_literals
 import io
 from os import path
 
-from pip.req import parse_requirements
+from packaging.requirements import Requirement
 from setuptools import find_packages, setup
 
 
 def get_requirements(requirements_file):
-    """Use pip to parse requirements file."""
+    """Parse requirements file."""
     requirements = []
     if path.isfile(requirements_file):
-        for req in parse_requirements(requirements_file, session="hack"):
-            # check markers, such as
-            #
-            #     rope_py3k    ; python_version >= '3.0'
-            #
-            if req.match_markers():
-                requirements.append(str(req.req))
+        with io.open(requirements_file, encoding="utf-8") as fp:
+            for line in fp:
+                if line.startswith("#") or line.strip() == "":
+                    continue
+                req = Requirement(line)
+                if req.marker is None or req.marker.evaluate():
+                    requirements.append('%s%s' % (req.name, req.specifier))
     return requirements
 
 
diff --git a/test-requirements.txt b/test-requirements.txt
index 45bb850f1..03529194c 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -5,3 +5,4 @@ testfixtures==4.7.0
 tox
 psycopg2-binary>=2.7.4
 mysqlclient>=1.3.3
+packaging