provision with mlaunch once on the supposition that #691 is fixed

.evergreen/Dockerfile.erb

@@ -32,6 +32,19 @@ RUN echo 2
 
   RUN apt-get install -y curl
 
+  <% if preload? && distro =~ /ubuntu1204/ %>
+
+    # ubuntu1204 comes with python 2.7.3.
+    # Install a more recent one from deadsnakes ppa so that pip works.
+    RUN apt-get install -y python-software-properties
+    # https://github.com/deadsnakes/issues/issues/53
+    RUN apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 5BB92C09DB82666C
+    RUN add-apt-repository ppa:fkrull/deadsnakes-python2.7
+    RUN apt-get update
+    RUN apt-get install -y python2.7-dev
+
+  <% end %>
+
 <% end %>
 
 <% if ruby_head? %>
@@ -107,6 +120,17 @@ RUN echo 2
     ENV USE_OPT_TOOLCHAIN=1
 
   <% end %>
+
+  <% if distro =~ /ubuntu1204/ %>
+
+    # Ubuntu 12.04 ships pip 1.0 which is ancient and does not work.
+    # https://pip.pypa.io/en/stable/installing/
+    RUN curl --retry 3 -fLo get-pip.py https://bootstrap.pypa.io/get-pip.py
+    RUN python get-pip.py
+
+  <% end %>
+
+  RUN pip --version
 
 <% end %>
 
@@ -124,9 +148,7 @@ WORKDIR /app
 
 COPY . .
 
-ENV MONGO_ORCHESTRATION_HOME=/tmpfs
-ENV PROJECT_DIRECTORY=/app
+ENV MONGO_ORCHESTRATION_HOME=/tmpfs \
+  PROJECT_DIRECTORY=/app
 
-<% @env.each do |k, v| %>
-ENV <%= k %>="<%= v %>"
-<% end %>
+ENV <%= @env.map { |k, v| %Q`#{k}="#{v}"` }.join(" \\\n  ") %>

.evergreen/functions.sh

@@ -300,10 +300,6 @@ install_mlaunch_pip() {
   python -V || true
   python3 -V || true
   pythonpath="$MONGO_ORCHESTRATION_HOME"/python
-  # The scripts in a python installation have shebangs pointing to the
-  # prefix, which doesn't work for us because we unpack toolchain to a
-  # different directory than prefix used for building. Work around this by
-  # explicitly running pip3 with python.
   pip install -t "$pythonpath" 'mtools-legacy[mlaunch]'
   export PATH="$pythonpath/bin":$PATH
   export PYTHONPATH="$pythonpath"

.evergreen/run-tests.sh

@@ -16,7 +16,7 @@ setup_ruby
 
 prepare_server $arch
 
-install_mlaunch_git https://github.com/p-mongo/mtools wait-for-rs
+install_mlaunch_pip
 
 # Launching mongod under $MONGO_ORCHESTRATION_HOME
 # makes its log available through log collecting machinery
@@ -78,23 +78,7 @@ if test "$SSL" = ssl; then
 "tlsCertificateKeyFile=spec/support/certificates/$client_pem"
 fi
 
-# mlaunch frequently fails to provision sharded clusters with authentication -
-# see https://github.com/rueckstiess/mtools/issues/691.
-# Give it 5 attempts.
-ok=false
-for i in `seq 5`; do
-  if mlaunch --dir "$dbdir" --binarypath "$BINDIR" $args; then
-    ok=true
-    break
-  fi
-  mlaunch stop --dir "$dbdir" || true
-  rm -rf "$dbdir"
-done
-
-if ! $ok; then
-  echo mlaunch failed to provision the desired deployment 1>&2
-  exit 5
-fi
+python -m mtools.mlaunch.mlaunch --dir "$dbdir" --binarypath "$BINDIR" $args
 
 install_deps
 
@@ -180,6 +164,6 @@ echo ${test_status}
 
 kill_jruby
 
-mlaunch stop --dir "$dbdir"
+python -m mtools.mlaunch.mlaunch stop --dir "$dbdir"
 
 exit ${test_status}