Feature/alpine: fix compiliation and add test

.github/workflows/test_environment.yml

@@ -123,6 +123,7 @@ jobs:
           ./waf rover
 
       - name: test build Chibios ${{matrix.os}}.${{matrix.name}}
+        if: matrix.os != 'alpine'
         env:
           DISABLE_MAVNATIVE: True
           DEBIAN_FRONTEND: noninteractive
@@ -141,3 +142,38 @@ jobs:
           git config --global --add safe.directory /__w/ardupilot/ardupilot
           ./waf configure --board CubeOrange
           ./waf plane
+
+  build-alpine:  # special case for alpine as it doesn't have bash by default
+    runs-on: ubuntu-22.04
+    container:
+      image: alpine:latest
+      options: --privileged
+    steps:
+      - name: Install Git
+        timeout-minutes: 30
+        env:
+          DEBIAN_FRONTEND: noninteractive
+          TZ: Europe/Paris
+        run: |
+          apk update && apk add --no-cache git
+      - uses: actions/checkout@v4
+        with:
+          submodules: 'recursive'
+      - name: test install environment alpine
+        timeout-minutes: 60
+        env:
+          DISABLE_MAVNATIVE: True
+          TZ: Europe/Paris
+          SKIP_AP_GIT_CHECK: 1
+        run: |
+          PATH="/github/home/.local/bin:$PATH"
+          Tools/environment_install/install-prereqs-alpine.sh
+      - name: test build STIL alpine
+        env:
+          DISABLE_MAVNATIVE: True
+          TZ: Europe/Paris
+        run: |
+          git config --global --add safe.directory ${GITHUB_WORKSPACE}
+          git config --global --add safe.directory /__w/ardupilot/ardupilot
+          ./waf configure
+          ./waf rover

Tools/environment_install/install-prereqs-alpine.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env sh
+echo "---------- $0 start ----------"
+set -e
+set -x
+
+echo "==================================================================="
+echo "Warning: This script is not fully tested. Please report any issues."
+echo "==================================================================="
+
+
+apk update && apk add --no-cache \
+        linux-headers \
+        g++ \
+        python3 \
+        py-future \
+        py-pip \
+        libxml2-dev \
+        libxslt-dev \
+        git \
+    && ln -sf python3 /usr/bin/python \
+    &&  rm -rf /var/cache/apk/*
+
+python3 -m pip install --user --no-deps --no-cache-dir empy==3.3.4 pexpect ptyprocess --break-system-packages

libraries/AP_HAL/utility/Socket.cpp

@@ -40,6 +40,7 @@
 #include <netinet/tcp.h>
 #include <arpa/inet.h>
 #include <sys/select.h>
+#include <sys/time.h>
 #endif
 
 #include <errno.h>

libraries/AP_HAL_Linux/CANSocketIface.cpp

@@ -34,6 +34,7 @@
 
 #include <sys/socket.h>
 #include <sys/ioctl.h>
+#include <sys/time.h>
 #include <net/if.h>
 #include <linux/can/raw.h>
 #include <cstring>

libraries/AP_HAL_Linux/VideoIn.h

@@ -15,6 +15,7 @@
 #pragma once
 
 #include "AP_HAL_Linux.h"
+#include <sys/time.h>
 #include <linux/videodev2.h>
 #include <vector>
 

libraries/SITL/SIM_GPS.cpp

@@ -11,6 +11,7 @@
 #if HAL_SIM_GPS_ENABLED
 
 #include <time.h>
+#include <sys/time.h>
 
 #include <AP_BoardConfig/AP_BoardConfig.h>
 #include <AP_HAL/AP_HAL.h>

libraries/SITL/SIM_GPS.h

@@ -27,6 +27,7 @@ param set SERIAL5_PROTOCOL 5
 
 #if HAL_SIM_GPS_ENABLED
 
+#include <sys/time.h>
 #include "SIM_SerialDevice.h"
 
 namespace SITL {

libraries/SITL/SIM_GPS_MSP.cpp

@@ -7,6 +7,7 @@
 #include <SITL/SITL.h>
 
 #include <time.h>
+#include <sys/time.h>
 
 using namespace SITL;
 

libraries/SITL/SIM_GPS_NMEA.cpp

@@ -9,6 +9,7 @@
 #include <AP_HAL/AP_HAL.h>
 
 #include <time.h>
+#include <sys/time.h>
 
 extern const AP_HAL::HAL& hal;
 

libraries/SITL/SIM_MicroStrain.cpp

@@ -25,6 +25,7 @@
 */
 #include "SIM_MicroStrain.h"
 #include <stdio.h>
+#include <sys/time.h>
 #include <unistd.h>
 #include <fcntl.h>
 #include <AP_HAL/utility/sparse-endian.h>

libraries/SITL/SIM_MicroStrain.h

@@ -6,6 +6,7 @@
 
 #include <SITL/SITL.h>
 #include "SIM_SerialDevice.h"
+#include <sys/time.h>
 
 namespace SITL
 {

libraries/SITL/SIM_VectorNav.cpp

@@ -18,6 +18,7 @@
 
 #include "SIM_VectorNav.h"
 #include <stdio.h>
+#include <sys/time.h>
 #include <unistd.h>
 #include <fcntl.h>
 #include <AP_Common/NMEA.h>