Add Docker-based Linux release build for Ubuntu 20.04 compatibility

.gitignore

@@ -170,6 +170,7 @@ src/cc/games/tetris
 *~
 *.zip
 release-win64/
+release-linux/
 src/RandomX/build-linux/
 src/RandomX/build-win64/
 src/wallet-utility.exe

Dockerfile.build

@@ -0,0 +1,17 @@
+FROM ubuntu:20.04
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get update && apt-get install -y \
+    build-essential cmake pkg-config libtool autoconf automake \
+    curl git m4 g++ gcc libcurl4-gnutls-dev zlib1g-dev \
+    libsodium-dev unzip zip bsdmainutils \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /hush3
+
+# Build script - runs inside container
+COPY build-docker-release.sh /build-docker-release.sh
+RUN chmod +x /build-docker-release.sh
+
+ENTRYPOINT ["/build-docker-release.sh"]

build-docker-release.sh

@@ -0,0 +1,43 @@
+#!/usr/bin/env bash
+# Build inside Docker container for Ubuntu 20.04 compatibility
+set -eu -o pipefail
+
+cd /hush3
+
+# Clean previous build artifacts that may be from the host
+make clean 2>/dev/null || true
+
+# Clean host-built depends (native binaries won't work in container)
+rm -rf depends/built depends/x86_64-unknown-linux-gnu depends/work
+make -C depends clean 2>/dev/null || true
+
+# Build RandomX for Linux (clean, since host build is different arch/libc)
+cd src/RandomX
+rm -rf build-linux
+mkdir -p build-linux && cd build-linux
+cmake -DARCH=native ..
+make -j$(nproc)
+cd /hush3
+
+# Run the normal build
+./util/build.sh --disable-tests -j$(nproc)
+
+# Package release
+echo "Creating Linux release package..."
+VERSION=$(grep -oP 'define\(_CLIENT_VERSION.*?,\s*\K[0-9]+' configure.ac | head -4 | tr '\n' '.' | sed 's/\.$//')
+VERSION=${VERSION:-3.10.5}
+RELEASE_DIR="release-linux"
+mkdir -p "$RELEASE_DIR"
+
+strip -s src/hushd src/hush-cli src/hush-tx
+cp src/hushd src/hush-cli src/hush-tx "$RELEASE_DIR/"
+cp asmap.dat sapling-spend.params sapling-output.params "$RELEASE_DIR/" 2>/dev/null || true
+cp src/hush-arrakis-chain src/dragonxd src/dragonx-cli "$RELEASE_DIR/"
+
+rm -f "hush-${VERSION}-linux64.zip"
+cd "$RELEASE_DIR"
+zip -9 "../hush-${VERSION}-linux64.zip" *
+cd ..
+
+echo "Release package created: hush-${VERSION}-linux64.zip"
+ls -lh "hush-${VERSION}-linux64.zip"

build.sh

@@ -41,6 +41,16 @@ if [[ "${1:-}" == "--win-release" ]]; then
     exit $?
 fi
 
+# Check for --linux-release flag (builds inside Ubuntu 20.04 container for max compatibility)
+if [[ "${1:-}" == "--linux-release" ]]; then
+    shift
+    echo "Building Linux release inside Ubuntu 20.04 Docker container..."
+    sudo docker build -t hush-builder -f Dockerfile.build .
+    sudo docker run --rm -v "$SCRIPT_DIR:/hush3" hush-builder "$@"
+    echo "Docker build complete. Release is in release-linux/"
+    exit $?
+fi
+
 # run correct build script for detected OS
 if [[ "$OSTYPE" == "linux-gnu"* ]]; then
     check_and_clean_target "linux"

configure.ac

@@ -3,8 +3,8 @@ AC_PREREQ([2.60])
 define(_CLIENT_VERSION_MAJOR, 3)
 dnl Must be kept in sync with src/clientversion.h , ugh!
 define(_CLIENT_VERSION_MINOR, 10)
-define(_CLIENT_VERSION_REVISION, 4)
-define(_CLIENT_VERSION_BUILD, 50)
+define(_CLIENT_VERSION_REVISION, 5)
+define(_CLIENT_VERSION_BUILD, 0)
 define(_ZC_BUILD_VAL, m4_if(m4_eval(_CLIENT_VERSION_BUILD < 25), 1, m4_incr(_CLIENT_VERSION_BUILD), m4_eval(_CLIENT_VERSION_BUILD < 50), 1, m4_eval(_CLIENT_VERSION_BUILD - 24), m4_eval(_CLIENT_VERSION_BUILD == 50), 1, , m4_eval(_CLIENT_VERSION_BUILD - 50)))
 define(_CLIENT_VERSION_SUFFIX, m4_if(m4_eval(_CLIENT_VERSION_BUILD < 25), 1, _CLIENT_VERSION_REVISION-beta$1, m4_eval(_CLIENT_VERSION_BUILD < 50), 1, _CLIENT_VERSION_REVISION-rc$1, m4_eval(_CLIENT_VERSION_BUILD == 50), 1, _CLIENT_VERSION_REVISION, _CLIENT_VERSION_REVISION-$1)))
 define(_CLIENT_VERSION_IS_RELEASE, true)