Use tox_install.sh to handle Depends-On

By using zuul-cloner, developers can use Depends-On directive
in a commit message to test cross-project dependency.

Change-Id: I0c593e2369cdfac17f21c5c0a07d9e73246602d8

{{cookiecutter.repo_name}}/test-requirements.txt

@@ -26,5 +26,3 @@ sphinx!=1.3b1,<1.3,>=1.2.1 # BSD
 testtools>=1.4.0 # MIT
 # This also needs xvfb library installed on your OS
 xvfbwrapper>=0.1.3 #license: MIT
-# Include horizon as test requirement
-http://tarballs.openstack.org/horizon/horizon-master.tar.gz#egg=horizon

{{cookiecutter.repo_name}}/tools/tox_install.sh

@@ -0,0 +1,88 @@
+#!/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.
+# The script also has a secondary purpose to install certain special
+# dependencies directly from git.
+
+# Wrapper for pip install that always uses constraints.
+function pip_install() {
+    pip install -c"$localfile" -U "$@"
+}
+
+# Grab the library from git using either zuul-cloner or pip.  The former is
+# there to a take advantage of the setup done by the gate infrastructure
+# and honour any/all Depends-On headers in the commit message
+function install_from_git() {
+    ZUUL_CLONER=/usr/zuul-env/bin/zuul-cloner
+    # GIT_HOST=git.openstack.org
+    GIT_HOST=github.com
+    PROJ=$1
+    EGG=$2
+
+    edit-constraints "$localfile" -- "$EGG"
+    if [ -x "$ZUUL_CLONER" ]; then
+        SRC_DIR="$VIRTUAL_ENV/src"
+        mkdir -p "$SRC_DIR"
+        cd "$SRC_DIR" >/dev/null
+        ZUUL_CACHE_DIR=${ZUUL_CACHE_DIR:-/opt/git} $ZUUL_CLONER \
+            --branch "$BRANCH_NAME" \
+            "git://$GIT_HOST" "$PROJ"
+        pip_install -e "$PROJ/."
+        cd - >/dev/null
+    else
+        SRC_DIR="$VIRTUAL_ENV/src/$PROJ"
+        git clone --depth 1 --branch $BRANCH_NAME https://$GIT_HOST/$PROJ $SRC_DIR
+        pip_install -e $SRC_DIR
+    fi
+}
+
+
+
+CONSTRAINTS_FILE="$1"
+shift 1
+
+# This script will either complete with a return code of 0 or the return code
+# of whatever failed.
+set -e
+
+# NOTE(tonyb): Place this in the tox environment's log dir so it will get
+# published to logs.openstack.org for easy debugging.
+mkdir -p "$VIRTUAL_ENV/log/"
+localfile="$VIRTUAL_ENV/log/upper-constraints.txt"
+
+if [[ "$CONSTRAINTS_FILE" != http* ]]; then
+    CONSTRAINTS_FILE="file://$CONSTRAINTS_FILE"
+fi
+# NOTE(tonyb): need to add curl to bindep.txt if the project supports bindep
+curl "$CONSTRAINTS_FILE" --insecure --progress-bar --output "$localfile"
+
+pip_install openstack-requirements
+
+# This is the main purpose of the script: Allow local installation of
+# the current repo. It is listed in constraints file and thus any
+# install will be constrained and we need to unconstrain it.
+edit-constraints "$localfile" -- "$CLIENT_NAME"
+
+declare -a passthrough_args
+while [ $# -gt 0 ] ; do
+    case "$1" in
+    # If we have any special os:<repo_name:<egg_name> deps then process them
+    os:*)
+        declare -a pkg_spec
+        IFS=: pkg_spec=($1)
+        install_from_git "${pkg_spec[1]}" "${pkg_spec[2]}"
+    ;;
+    # Otherwise just pass the other deps through to the constrained pip install
+    *)
+        passthrough_args+=("$1")
+    ;;
+    esac
+    shift 1
+done
+
+# If *only* had special args then then isn't any need to run pip.
+if [ -n "$passthrough_args" ] ; then
+    pip_install "${passthrough_args[@]}"
+fi

{{cookiecutter.repo_name}}/tox.ini

@@ -6,14 +6,18 @@ skipsdist = True
 [testenv]
 usedevelop = True
 setenv = VIRTUAL_ENV={envdir}
+         BRANCH_NAME=master
+         CLIENT_NAME={{cookiecutter.repo_name}}
          NOSE_WITH_OPENSTACK=1
          NOSE_OPENSTACK_COLOR=1
          NOSE_OPENSTACK_RED=0.05
          NOSE_OPENSTACK_YELLOW=0.025
          NOSE_OPENSTACK_SHOW_ELAPSED=1
-install_command = pip install -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt} -U {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}
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
+       # os:* is handled by tox_install.sh
+       os:openstack/horizon:horizon
 commands = python manage.py test {posargs} --settings={{cookiecutter.module_name}}.test.settings
 
 [testenv:pep8]