diff --git a/tools/docker/build-manylinux1.sh b/tools/docker/build-manylinux1.sh
index d6e57c6f7e..3a29b1a037 100755
--- a/tools/docker/build-manylinux1.sh
+++ b/tools/docker/build-manylinux1.sh
@@ -1,18 +1,79 @@
 #!/bin/bash
-# Build all the wheel artifacts for the platforms supported by manylinux1
-# and export them to the specified location.
+# Build all the wheel artifacts for the platforms supported by manylinux1 and
+# export them to the specified location.
 #
 # Arguments:
 #
-#   $1 the build process root directory. If not specified as argument,
-#      the env var BUILD_ROOT will be used. If not specified at all, a
-#      default location will be used.
+#   $1 the build process root directory. If not specified as argument, the
+#      env var BUILD_ROOT will be used. If not specified at all, a default
+#      location will be used.
 #
-#   $2 the artifacts export directory. If not specified as argument,
-#      the env var EXPORT_ROOT will be used. If not specified at all, a
-#      default location will be used.
+#   $2 the artifacts export directory. If not specified as argument, the env
+#      var EXPORT_ROOT will be used. If not specified at all, a default location
+#      will be used.
 set -e
 
+
+function contains_element () {
+    # Look for the presence of an element in an array. Echoes '0' if found,
+    # '1' otherwise.
+    # Arguments:
+    #   $1 the element to be searched
+    #   $2 the array to search into
+    local e match="$1"
+    shift
+    for e; do [[ "$e" == "$match" ]] && echo '0' && return; done
+    echo '1' && return
+}
+
+
+function export_manylinux_wheel {
+    # Build all the wheel artifacts assuming that the current 'python' command
+    # is the target interpreter. Please note that in order to have or-tools
+    # correctly detect the target python version, this function should be run in
+    # a virtualenv.
+    # Arguments:
+    #   $1 the or-tools sources root directory
+    #   $2 the artifacts export directory
+    if [ "$#" -ne 2 ]; then
+        echo "build_pypi_archives called with an illegal number of parameters"
+        exit 1  # TODO return error and check it outside
+    fi
+    local src_root="$1"
+    local export_root="$2"
+    # Build python bindings
+    cd "$src_root"
+    # We need to force this target, otherwise the protobuf stub will be missing
+    # (for the makefile, it exists even if previously generated for another
+    # platform)
+    make -B install_python_modules  # regenerates Makefile.local
+    make python
+    make test_python
+    make pypi_archive
+    # Build and repair wheels
+    cd temp-python*/ortools
+    python setup.py bdist_wheel
+    cd dist
+    auditwheel repair ./*.whl -w "$export_root"
+}
+
+
+function test_installed {
+    # Run all the specified test scripts using the current environment.
+    # Arguments:
+    #   $@ the test files to be tested
+    local testfiles=("${@}")
+    cd "$(mktemp -d)" # ensure we are not importing something from $PWD
+    for testfile in "${testfiles[@]}"
+    do
+        python "$testfile"
+    done
+}
+
+
+###############################################################################
+# Setup
+
 if [ -n "$1" ]; then BUILD_ROOT="$1"; fi
 if [ -n "$2" ]; then EXPORT_ROOT="$2"; fi
 
@@ -31,15 +92,15 @@ fi
 SRC_ROOT="${BUILD_ROOT}/or-tools"
 
 # Platforms to be ignored.
-# The build of Python 2.6.x bindings is known to be broken
-# (and 2.6 itself is deprecated).
+# The build of Python 2.6.x bindings is known to be broken (and 2.6 itself is
+# deprecated).
 SKIP_PLATFORMS=(
     cp26-cp26m
     cp26-cp26mu
 )
 
-# Python scripts to be used as tests for the installed wheel.
-# This list of files has been taken from 'test_python' make target.
+# Python scripts to be used as tests for the installed wheel. This list of files
+# has been taken from the 'test_python' make target.
 TESTS=(
     "${SRC_ROOT}/examples/python/hidato_table.py"
     "${SRC_ROOT}/examples/python/tsp.py"
@@ -54,62 +115,12 @@ TESTS=(
 echo "BUILD_ROOT=${BUILD_ROOT}"
 echo "SRC_ROOT=${SRC_ROOT}"
 echo "EXPORT_ROOT=${EXPORT_ROOT}"
-echo "SKIP_PLATFORMS=${SKIP_PLATFORMS[@]}"
-echo "TESTS=${TESTS[@]}"
+echo "SKIP_PLATFORMS=(${SKIP_PLATFORMS[*]})"
+echo "TESTS=(${TESTS[*]})"
 
-################################################################################
-
-function contains_element () {
-    # Look for the presence of an element in an array. Echoes '0' if found,
-    # '1' otherwise.
-    # Arguments:
-    #   $1 the element to be searched
-    #   $2 the array to search into
-    local e match="$1"
-    shift
-    for e; do [[ "$e" == "$match" ]] && echo '0' && return; done
-    echo '1' && return
-}
-
-function export_manylinux_wheel {
-    # Build all the wheel artifacts assuming that the current 'python'
-    # command is the target interpreter. Please note that in order to
-    # have or-tools correctly detect the target python version, this
-    # function should be run in a virtualenv.
-    # Arguments:
-    #   $1 the or-tools sources root directory
-    #   $2 the artifacts export directory
-    if [ "$#" -ne 2 ]; then
-        echo "build_pypi_archives called with an illegal number of parameters"
-        exit 1  # TODO return error and check it outside
-    fi
-    _SRC_ROOT="$1"
-    _EXPORT_ROOT="$2"
-    # Build
-    cd "$_SRC_ROOT"
-    # We need to force this target, otherwise the protobuf stub will be missing
-    # (for the makefile, it exists even if previously generated for another
-    # platform)
-    make -B install_python_modules  # regenerates Makefile.local
-    make python
-    make test_python
-    make pypi_archive
-    # Build and repair wheels
-    cd temp-python*/ortools
-    python setup.py bdist_wheel
-    cd dist
-    auditwheel repair *.whl -w "$_EXPORT_ROOT"
-}
-
-function test_installed {
-    cd $(mktemp -d) # ensure we are not importing something from $PWD
-    for testfile in "${TESTS[@]}"
-    do
-        python "$testfile"
-    done
-}
 
 ###############################################################################
+# Main
 
 mkdir -p "${BUILD_ROOT}"
 mkdir -p "${EXPORT_ROOT}"
@@ -131,27 +142,25 @@ fi
 
 # TODO remove all patching, write Makefile targets for manylinux
 
-# Patch makefile, remove offending command
-# (the setup.py-e file doesn't exist)
+# Patch makefile, remove offending command (the setup.py-e file doesn't exist)
 cd "$SRC_ROOT"
-sed -i -e 's=-rm $(PYPI_ARCHIVE_TEMP_DIR)/ortools/setup.py-e==g' makefiles/Makefile.python.mk
+sed -i -e "s=-rm \$(PYPI_ARCHIVE_TEMP_DIR)/ortools/setup.py-e==g" makefiles/Makefile.python.mk
 
-# Patch makefile, remove manual libortools.so grafting
-# and RPATH setting. All of this stuff will be carried
-# out by auditwheel, otherwise we would end up with a
+# Patch makefile, remove manual libortools.so grafting and RPATH setting. All of
+# this stuff will be carried out by auditwheel, otherwise we would end up with a
 # broken manylinux wheel file
 cd "$SRC_ROOT"
-sed -i -e 's=cp lib/libortools=#=g' makefiles/Makefile.python.mk
-sed -i -e 's=tools/fix_python_libraries_on_linux.sh=#=g' makefiles/Makefile.python.mk
+sed -i -e "s=cp lib/libortools=#=g" makefiles/Makefile.python.mk
+sed -i -e "s=tools/fix_python_libraries_on_linux.sh=#=g" makefiles/Makefile.python.mk
 
-# For each python platform provided by manylinux,
-# build, export and test artifacts.
+# For each python platform provided by manylinux, build, export and test
+# artifacts.
 for PYROOT in /opt/python/*
 do
     PYTAG=$(basename "$PYROOT")
     # Check for platforms to be skipped
     SKIP=$(contains_element "$PYTAG" "${SKIP_PLATFORMS[@]}")
-    if [ $SKIP -eq '0' ]
+    if [ "$SKIP" -eq '0' ]
     then
         echo "skipping deprecated platform $PYTAG"
         continue
@@ -182,8 +191,8 @@ do
     source "${BUILD_ROOT}/${PYTAG}-test/bin/activate"
     pip install -U pip setuptools wheel six
     # Install wheel and run tests
-    pip install --no-cache-dir $WHEEL_FILE
-    test_installed
+    pip install --no-cache-dir "$WHEEL_FILE"
+    test_installed "${TESTS[@]}"
     # Restore environment
     deactivate
 done