Add tox_install.sh for pypowervm upper-constraints workaround

With the recent addition of pypowervm to upper-constraints, installs
of ceilometer-powervm are now by default enforcing the version set there.
Since the master branch of ceilometer-powervm depends on the develop
version of pypowervm, this causes installs to fail.

This changeset adds a wrapper script (tox_install.sh) that edits
the upper-constraints file and replaces the pypowervm version pin
then sets pypowervm to be installed from source instead.

Change-Id: Ib60ee84ecb168991439ac5d097ba07a62d2329a7

requirements.txt

@@ -1,3 +1,4 @@
 oslo.log>=1.14.0  # Apache-2.0
 pbr>=1.6  # Apache-2.0
+pypowervm
 setuptools>=16.0

tools/tox_install.sh

@@ -0,0 +1,59 @@
+#!/usr/bin/env bash
+
+# Base code from https://github.com/openstack/glance_store/blob/master/tools/tox_install.sh
+#
+# Library constraint file contains version pin that is in conflict with
+# installing the library from source. We should replace the version pin in
+# the constraints file before applying it for from-source installation.
+
+ZUUL_CLONER=/usr/zuul-env/bin/zuul-cloner
+BRANCH_NAME=master
+LIB_NAME=pypowervm
+LIB_BRANCH=develop
+LIB_LOCATION=git+https://github.com/powervm/$LIB_NAME@$LIB_BRANCH#egg=$LIB_NAME
+requirements_installed=$(echo "import openstack_requirements" | python 2>/dev/null ; echo $?)
+
+set -e -x
+
+CONSTRAINTS_FILE=$1
+shift
+
+install_cmd="pip install"
+mydir=$(mktemp -dt "$LIB_NAME-tox_install-XXXXXXX")
+trap "rm -rf $mydir" EXIT
+localfile=$mydir/upper-constraints.txt
+if [[ $CONSTRAINTS_FILE != http* ]]; then
+    CONSTRAINTS_FILE=file://$CONSTRAINTS_FILE
+fi
+curl $CONSTRAINTS_FILE -k -o $localfile
+install_cmd="$install_cmd -c$localfile"
+
+if [ $requirements_installed -eq 0 ]; then
+    echo "ALREADY INSTALLED" > /tmp/tox_install.txt
+    echo "Requirements already installed; using existing package"
+elif [ -x "$ZUUL_CLONER" ]; then
+    echo "ZUUL CLONER" > /tmp/tox_install.txt
+    pushd $mydir
+    $ZUUL_CLONER --cache-dir \
+        /opt/git \
+        --branch $BRANCH_NAME \
+        git://git.openstack.org \
+        openstack/requirements
+    cd openstack/requirements
+    $install_cmd -e .
+    popd
+else
+    echo "PIP HARDCODE" > /tmp/tox_install.txt
+    if [ -z "$REQUIREMENTS_PIP_LOCATION" ]; then
+        REQUIREMENTS_PIP_LOCATION="git+https://git.openstack.org/openstack/requirements@$BRANCH_NAME#egg=requirements"
+    fi
+    $install_cmd -U -e ${REQUIREMENTS_PIP_LOCATION}
+fi
+
+# 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 -- $LIB_NAME "-e $LIB_LOCATION"
+
+$install_cmd -U $*
+exit $?

tox.ini

@@ -5,13 +5,13 @@ envlist = py34,py27,pep8
 
 [testenv]
 usedevelop = True
-install_command = pip install -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt} {opts} {packages}
+install_command =
+    {toxinidir}/tools/tox_install.sh {env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt} {opts} {packages}
 setenv = VIRTUAL_ENV={envdir}
 	 PYTHONHASHSEED=0
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
        -egit+https://github.com/openstack/ceilometer#egg=ceilometer
-       -egit+https://github.com/powervm/pypowervm@develop#egg=pypowervm
 whitelist_externals = bash
 commands = bash tools/pretty_tox.sh '{posargs}'