@@ -1045,7 +1045,7 @@ function apt_get_update {

 # Uses globals ``OFFLINE``, ``*_proxy``

 # apt_get operation package [package ...]

 function apt_get {

-    local xtrace

+    local xtrace result

     xtrace=$(set +o | grep xtrace)

     set +o xtrace

@@ -1062,9 +1062,11 @@ function apt_get {

         http_proxy=${http_proxy:-} https_proxy=${https_proxy:-} \

         no_proxy=${no_proxy:-} \

         apt-get --option "Dpkg::Options::=--force-confold" --assume-yes "$@"

+    result=$?

     # stop the clock

     time_stop "apt-get"

+    return $result

 }

 function _parse_package_files {

@@ -81,7 +81,7 @@ function get_python_versions_for_package {

 # ``PIP_UPGRADE``, ``TRACK_DEPENDS``, ``*_proxy``,

 # pip_install package [package ...]

 function pip_install {

-    local xtrace

+    local xtrace result

     xtrace=$(set +o | grep xtrace)

     set +o xtrace

     local upgrade=""

@@ -155,10 +155,11 @@ function pip_install {

         PIP_FIND_LINKS=$PIP_FIND_LINKS \

         $cmd_pip $upgrade \

         $@

+    result=$?

     # Also install test requirements

     local test_req="${!#}/test-requirements.txt"

-    if [[ -e "$test_req" ]]; then

+    if [[ $result == 0 ]] && [[ -e "$test_req" ]]; then

         echo "Installing test-requirements for $test_req"

         $sudo_pip \

             http_proxy=${http_proxy:-} \

@@ -167,9 +168,11 @@ function pip_install {

             PIP_FIND_LINKS=$PIP_FIND_LINKS \

             $cmd_pip $upgrade \

             -r $test_req

+        result=$?

     fi

     time_stop "pip_install"

+    return $result

 }

 # get version of a package from global requirements file