Add Constraints support

Adding constraints support to libraries is slightly more complex than
services as the libraries themselves are listed in upper-constraints.txt
which leads to errors that you can't install a specific version and a
constrained version.

This change adds constraints support by also adding a helper script to
edit the constraints to remove python-swiftclient.

Change-Id: I3947a6165eaa9f5cb62a7df4f5a2c16065da2f1d

bindep.txt

@@ -1,5 +1,6 @@
 # This is a cross-platform list tracking distribution packages needed by tests;
 # see http://docs.openstack.org/infra/bindep/ for additional information.
 
+curl
 pypy [test]
 pypy-dev [test]

tools/tox_install.sh

@@ -0,0 +1,31 @@
+#!/usr/bin/env bash
+
+# Client constraint file contains this client version pin that is in conflict
+# with installing the client from source. We should remove the version pin in
+# the constraints file before applying it for from-source installation.
+
+set -e
+
+if [[ -z "$CONSTRAINTS_FILE" ]]; then
+    echo 'WARNING: expected $CONSTRAINTS_FILE to be set' >&2
+    PIP_FLAGS=(-U)
+else
+    # NOTE(tonyb): Place this in the tox enviroment's log dir so it will get
+    # published to logs.openstack.org for easy debugging.
+    localfile="$VIRTUAL_ENV/log/upper-constraints.txt"
+
+    if [[ "$CONSTRAINTS_FILE" != http* ]]; then
+        CONSTRAINTS_FILE="file://$CONSTRAINTS_FILE"
+    fi
+    curl "$CONSTRAINTS_FILE" --insecure --progress-bar --output "$localfile"
+
+    pip install -c"$localfile" openstack-requirements
+
+    # This is the main purpose of the script: Allow local installation of
+    # the current repo. It is listed in constraints file and thus any
+    # install will be constrained and we need to unconstrain it.
+    edit-constraints "$localfile" -- "$CLIENT_NAME"
+    PIP_FLAGS=(-c"$localfile" -U)
+fi
+
+pip install "${PIP_FLAGS[@]}" "$@"

tox.ini

@@ -1,14 +1,17 @@
 [tox]
 envlist = py27,py34,py35,pypy,pep8
-minversion = 1.6
+minversion = 2.0
 skipsdist = True
 
 [testenv]
 usedevelop = True
-install_command = pip install -U {opts} {packages}
+install_command = {toxinidir}/tools/tox_install.sh {opts} {packages}
 setenv =
   LANG=en_US.utf8
   VIRTUAL_ENV={envdir}
+  BRANCH_NAME=master
+  CLIENT_NAME=python-swiftclient
+  CONSTRAINTS_FILE={env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}
 
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
@@ -32,7 +35,9 @@ commands = python setup.py testr --coverage
            coverage report
 
 [testenv:func]
-setenv = OS_TEST_PATH=tests.functional
+setenv =
+    {[testenv]setenv}
+    OS_TEST_PATH=tests.functional
 whitelist_externals =
     coverage
     rm