From cf52e8e9ddd6db35980ef00aeb82396a17fafec5 Mon Sep 17 00:00:00 2001
From: GP Orcullo <kinsamanka@gmail.com>
Date: Sat, 26 Mar 2022 06:16:33 +0000
Subject: [PATCH 1/2] Add support for Alpine Linux

---
 CMakeLists.txt                                |  4 +++
 background_installer.sh                       | 26 ++++++++++++++++++-
 runtime/core/lib/iec_std_lib.h                |  5 ++++
 .../asio/include/asio/detail/socket_types.hpp |  6 ++++-
 4 files changed, 39 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9ebf5cc..db6a21f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -65,6 +65,7 @@ option(OPLC_ST_TO_C "Build target to convert ST to C" OFF)
 option(OPLC_MAIN_PROGRAM "Only compile the ST file" OFF)
 
 option(OPLC_BUILD_TESTS "Build automated tests" OFF)
+option(OPLC_MUSL "Support for musl libc" OFF)
 
 # Flag to build all dependencies and source
 if(OPLC_ALL)
@@ -172,6 +173,9 @@ endif()
 if(OPLC_DNP3_OUTSTATION)
     message("Build and install OpenDNP3 enabled")
     add_definitions(-DOPLC_DNP3_OUTSTATION)
+    if(OPLC_MUSL)
+        add_definitions(-DOPLC_MUSL)
+    endif()
     add_subdirectory(utils/dnp3_src)
     include_directories(utils/dnp3_src/cpp/libs/include)
 endif()
diff --git a/background_installer.sh b/background_installer.sh
index c5a2d6a..55ea9ab 100755
--- a/background_installer.sh
+++ b/background_installer.sh
@@ -7,6 +7,7 @@ if [ $# -eq 0 ]; then
     echo "Usage: ./install.sh [platform]   where [platform] can be"
     echo "  win           Install OpenPLC on Windows over Cygwin"
     echo "  linux         Install OpenPLC on a Debian-based Linux distribution"
+    echo "  alpine        Install OpenPLC on an Alpine-based Linux distribution"
     echo "  docker        Install OpenPLC in a Docker container"
     echo "  rpi           Install OpenPLC on a Raspberry Pi"
     echo "  neuron        Install OpenPLC on a UniPi Neuron PLC"
@@ -37,6 +38,13 @@ function linux_install_deps {
                           sqlite3 cmake git
 }
 
+function alpine_install_deps {
+    $1 apk add --no-cache autoconf automake bison cmake flex g++ make \
+                          libtool linux-headers pkgconf python3 py3-flask \
+                          py3-flask-login py3-pip py3-pyserial sqlite
+    $1 pip3 install pymodbus
+}
+
 function install_py_deps {
     $1 pip3 install -r requirements.txt
 }
@@ -52,12 +60,13 @@ function OPLC_background_service {
     $1 systemctl enable openplc.service
 }
 
+# arg1: additional CMAKE args
 function cmake_build_and_test {
     echo ""
     echo "Building the application"
     mkdir build
     cd build
-    cmake .. -DOPLC_ALL=ON
+    cmake .. -DOPLC_ALL=ON $1
     make
 
     echo "Executing platform tests"
@@ -126,6 +135,21 @@ elif [ "$1" == "linux" ]; then
     cd ../scripts
     ./change_hardware_layer.sh blank_linux
 
+elif [ "$1" == "alpine" ]; then
+    echo "Installing OpenPLC on Alpine Linux"
+    alpine_install_deps sudo
+
+    cmake_build_and_test -DOPLC_MUSL=ON
+
+    if [ $? -ne 0 ]; then
+        echo "Compilation finished with errors!"
+        exit 1
+    fi
+    echo "Compilation finished successfully!"
+
+    cd ../scripts
+    ./change_hardware_layer.sh blank_linux
+
 elif [ "$1" == "docker" ]; then
     echo "Installing OpenPLC on Linux inside Docker"
 
diff --git a/runtime/core/lib/iec_std_lib.h b/runtime/core/lib/iec_std_lib.h
index bd29e96..1949ea8 100644
--- a/runtime/core/lib/iec_std_lib.h
+++ b/runtime/core/lib/iec_std_lib.h
@@ -44,6 +44,11 @@
 #include <string.h>
 #include <stdarg.h>
 
+#ifdef OPLC_MUSL
+#define __NEED_time_t
+#include <bits/alltypes.h>
+#endif
+
 #ifdef DEBUG_IEC
 #define DBG(...) printf(__VA_ARGS__);
 #define DBG_TYPE(TYPENAME, name) __print_##TYPENAME(name);
diff --git a/utils/dnp3_src/deps/asio/asio/include/asio/detail/socket_types.hpp b/utils/dnp3_src/deps/asio/asio/include/asio/detail/socket_types.hpp
index 3114c08..655973f 100644
--- a/utils/dnp3_src/deps/asio/asio/include/asio/detail/socket_types.hpp
+++ b/utils/dnp3_src/deps/asio/asio/include/asio/detail/socket_types.hpp
@@ -58,7 +58,11 @@
 #else
 # include <sys/ioctl.h>
 # if !defined(__SYMBIAN32__)
-#  include <sys/poll.h>
+#  if defined(OPLC_MUSL)
+#    include <poll.h>
+#  else
+#    include <sys/poll.h>
+#  endif
 # endif
 # include <sys/types.h>
 # include <sys/stat.h>

From 1e3dbebe01458e88d84bf07221bf410e3ed22379 Mon Sep 17 00:00:00 2001
From: GP Orcullo <kinsamanka@gmail.com>
Date: Sun, 27 Mar 2022 02:14:43 +0000
Subject: [PATCH 2/2] add alpine to compile_program.sh

---
 background_installer.sh    | 1 +
 scripts/compile_program.sh | 6 +++++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/background_installer.sh b/background_installer.sh
index 55ea9ab..3756868 100755
--- a/background_installer.sh
+++ b/background_installer.sh
@@ -147,6 +147,7 @@ elif [ "$1" == "alpine" ]; then
     fi
     echo "Compilation finished successfully!"
 
+    touch ../etc/alpine
     cd ../scripts
     ./change_hardware_layer.sh blank_linux
 
diff --git a/scripts/compile_program.sh b/scripts/compile_program.sh
index f1cb67f..68cd9d6 100755
--- a/scripts/compile_program.sh
+++ b/scripts/compile_program.sh
@@ -13,7 +13,11 @@ echo ""
     
 if [ "$OPENPLC_PLATFORM" = "linux" ]; then
     cd ../build
-    cmake .. -Dprogram_name=$1
+    x=OFF
+    if [ -e ../etc/alpine ]; then
+        x=ON
+    fi
+    cmake .. -Dprogram_name=$1 -DOPLC_MUSL=$x
     cmake --build .
     if [ $? -ne 0 ]; then
         echo "Compilation finished with errors!"