upper-constraints setup for osc4 branch

I think we would like to install both osc-lib and OSC
from feature/osc4 branch not to use osc-lib constrainted by
upper-constraints.txt file.
This tweaks tox_install.sh to install both from the git repos
and it also supports Depends-On.

Change-Id: I08532078cd5d83a6d720627522220f9108772539

tools/tox_install.sh

@@ -7,49 +7,73 @@
 ZUUL_CLONER=/usr/zuul-env/bin/zuul-cloner
 BRANCH_NAME=master
 CLIENT_NAME=python-openstackclient
-requirements_installed=$(echo "import openstack_requirements" | python 2>/dev/null ; echo $?)
+GIT_BASE=${GIT_BASE:-https://git.openstack.org/}
+
+install_project() {
+    local project=$1
+    local module_name=$2
+    local branch=${3:-$BRANCH_NAME}
+
+    set +e
+    project_installed=$(echo "import $module_name" | python 2>/dev/null ; echo $?)
+    set -e
+
+    if [ $project_installed -eq 0 ]; then
+        echo "ALREADY INSTALLED"
+        echo "$project already installed; using existing package"
+    elif [ -x "$ZUUL_CLONER" ]; then
+        echo "ZUUL CLONER"
+        # Make this relative to current working directory so that
+        # git clean can remove it. We cannot remove the directory directly
+        # since it is referenced after $install_cmd -e
+        PROJECT_DIR=$VIRTUAL_ENV/src
+        mkdir -p $PROJECT_DIR
+        pushd $PROJECT_DIR
+        $ZUUL_CLONER --cache-dir \
+            /opt/git \
+            --branch $branch \
+            http://git.openstack.org \
+            openstack/$project
+        cd openstack/$project
+        $install_cmd -e .
+        popd
+    else
+        echo "PIP HARDCODE"
+        local GIT_REPO="$GIT_BASE/openstack/$project"
+        SRC_DIR="$VIRTUAL_ENV/src/openstack/$project"
+        git clone --depth 1 --branch $branch $GIT_REPO $SRC_DIR
+        $install_cmd -U -e $SRC_DIR
+    fi
+}
 
 set -e
+set -x
 
 CONSTRAINTS_FILE=$1
 shift
 
 install_cmd="pip install"
-mydir=$(mktemp -dt "$CLIENT_NAME-tox_install-XXXXXXX")
-trap "rm -rf $mydir" EXIT
-localfile=$mydir/upper-constraints.txt
+# NOTE(amotoki): 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 -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
+install_project requirements 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 -- $CLIENT_NAME "-e file://$PWD#egg=$CLIENT_NAME"
 
+# NOTE(amotoki): In feature/osc4 branch we install osc-lib feature/osc4 branch,
+# we install the git version of ocs-lib explicitly
+# and specify it in upper-constraints.txt
+edit-constraints $localfile -- osc-lib "-e file://$VIRTUAL_ENV/src/openstack/osc-lib#egg=osc-lib"
+install_project osc-lib osc_lib feature/osc4
+
 $install_cmd -U $*
 exit $?