build: Guard against accidental introduction of new Boost dependencies

test/lint/lint-includes.sh

@@ -5,12 +5,14 @@
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 #
 # Check for duplicate includes.
+# Guard against accidental introduction of new Boost dependencies.
 
 filter_suffix() {
     git ls-files | grep -E "^src/.*\.${1}"'$' | grep -Ev "/(leveldb|secp256k1|univalue)/"
 }
 
 EXIT_CODE=0
+
 for HEADER_FILE in $(filter_suffix h); do
     DUPLICATE_INCLUDES_IN_HEADER_FILE=$(grep -E "^#include " < "${HEADER_FILE}" | sort | uniq -d)
     if [[ ${DUPLICATE_INCLUDES_IN_HEADER_FILE} != "" ]]; then
@@ -20,6 +22,7 @@ for HEADER_FILE in $(filter_suffix h); do
         EXIT_CODE=1
     fi
 done
+
 for CPP_FILE in $(filter_suffix cpp); do
     DUPLICATE_INCLUDES_IN_CPP_FILE=$(grep -E "^#include " < "${CPP_FILE}" | sort | uniq -d)
     if [[ ${DUPLICATE_INCLUDES_IN_CPP_FILE} != "" ]]; then
@@ -29,4 +32,69 @@ for CPP_FILE in $(filter_suffix cpp); do
         EXIT_CODE=1
     fi
 done
+
+EXPECTED_BOOST_INCLUDES=(
+    boost/algorithm/string.hpp
+    boost/algorithm/string/case_conv.hpp
+    boost/algorithm/string/classification.hpp
+    boost/algorithm/string/join.hpp
+    boost/algorithm/string/predicate.hpp
+    boost/algorithm/string/replace.hpp
+    boost/algorithm/string/split.hpp
+    boost/assign/std/vector.hpp
+    boost/bind.hpp
+    boost/chrono/chrono.hpp
+    boost/date_time/posix_time/posix_time.hpp
+    boost/filesystem.hpp
+    boost/filesystem/detail/utf8_codecvt_facet.hpp
+    boost/filesystem/fstream.hpp
+    boost/interprocess/sync/file_lock.hpp
+    boost/multi_index/hashed_index.hpp
+    boost/multi_index/ordered_index.hpp
+    boost/multi_index/sequenced_index.hpp
+    boost/multi_index_container.hpp
+    boost/optional.hpp
+    boost/preprocessor/cat.hpp
+    boost/preprocessor/stringize.hpp
+    boost/program_options/detail/config_file.hpp
+    boost/scoped_array.hpp
+    boost/signals2/connection.hpp
+    boost/signals2/last_value.hpp
+    boost/signals2/signal.hpp
+    boost/test/unit_test.hpp
+    boost/thread.hpp
+    boost/thread/condition_variable.hpp
+    boost/thread/mutex.hpp
+    boost/thread/thread.hpp
+    boost/variant.hpp
+    boost/variant/apply_visitor.hpp
+    boost/variant/static_visitor.hpp
+)
+
+for BOOST_INCLUDE in $(git grep '^#include <boost/' -- "*.cpp" "*.h" | cut -f2 -d: | cut -f2 -d'<' | cut -f1 -d'>' | sort -u); do
+    IS_EXPECTED_INCLUDE=0
+    for EXPECTED_BOOST_INCLUDE in "${EXPECTED_BOOST_INCLUDES[@]}"; do
+        if [[ "${BOOST_INCLUDE}" == "${EXPECTED_BOOST_INCLUDE}" ]]; then
+            IS_EXPECTED_INCLUDE=1
+            break
+        fi
+    done
+    if [[ ${IS_EXPECTED_INCLUDE} == 0 ]]; then
+        EXIT_CODE=1
+        echo "A new Boost dependency in the form of \"${BOOST_INCLUDE}\" appears to have been introduced:"
+        git grep "${BOOST_INCLUDE}" -- "*.cpp" "*.h"
+        echo
+    fi
+done
+
+for EXPECTED_BOOST_INCLUDE in "${EXPECTED_BOOST_INCLUDES[@]}"; do
+    if ! git grep -q "^#include <${EXPECTED_BOOST_INCLUDE}>" -- "*.cpp" "*.h"; then
+        echo "Good job! The Boost dependency \"${EXPECTED_BOOST_INCLUDE}\" is no longer used."
+        echo "Please remove it from EXPECTED_BOOST_INCLUDES in $0"
+        echo "to make sure this dependency is not accidentally reintroduced."
+        echo
+        EXIT_CODE=1
+    fi
+done
+
 exit ${EXIT_CODE}