Added build script and version command

scripts/build.sh

@@ -0,0 +1,59 @@
+#!/usr/bin/env bash
+
+# Build script for ocdsgen release
+
+set -euo pipefail
+
+BUILD_DIR="build"
+RELEASE_DIR="release"
+DO_RELEASE=0
+
+if [[ $* == *--release* ]]; then
+    DO_RELEASE=1
+fi
+
+BUILD_TIME=$(date -u '+%Y-%m-%d_%H:%M:%S')
+GIT_COMMIT=
+VERSION=$(git describe --tags --abbrev=0 2>/dev/null || echo 'unknown')
+VERSION_TAG=$(git describe --tags 2>/dev/null || echo 'unknown')
+
+if [ "$VERSION" != "$VERSION_TAG" ]; then
+    echo "Dirty commits detected, marking as development build"
+    GIT_COMMIT=$(git rev-parse HEAD 2>/dev/null || echo 'unknown')
+    GIT_COMMIT_SHORT=$(git rev-parse --short HEAD 2>/dev/null || echo 'unknown')
+    VERSION="${VERSION}.${GIT_COMMIT_SHORT}"
+
+    DO_RELEASE=0
+    if [[ $* == *--release* && $* == *--force* ]]; then
+        echo "Forcing release build anyway"
+        DO_RELEASE=1
+    fi
+fi
+
+LD_FLAGS=${LD_FLAGS:-""}
+LD_FLAGS="$LD_FLAGS -X git.avsdev.uk/Go/go-ocds/internal/version.Version=${VERSION}"
+if [[ $DO_RELEASE -ne 1 ]]; then
+    LD_FLAGS="$LD_FLAGS -X git.avsdev.uk/Go/go-ocds/internal/version.BuildTime=${BUILD_TIME}"
+fi
+if [ "$GIT_COMMIT" != "" ]; then
+    LD_FLAGS="$LD_FLAGS -X git.avsdev.uk/Go/go-ocds/internal/version.GitCommit=${GIT_COMMIT}"
+fi
+
+# Build binary with version info
+go build \
+    -ldflags="$LD_FLAGS" \
+    -trimpath \
+    -o $BUILD_DIR/ocdsgen-$VERSION \
+    ./cmd/ocdsgen
+
+echo "Built $BUILD_DIR/ocdsgen-$VERSION"
+
+# If proper release, copy to output directory for packaging
+if [[ $DO_RELEASE -eq 1 ]]; then
+    install -DT $BUILD_DIR/ocdsgen-$VERSION $RELEASE_DIR/ocdsgen
+    ARCH=`dpkg --print-architecture`
+    tar -czf $RELEASE_DIR/ocdsgen-$VERSION-$ARCH.tar.gz \
+      --transform "s,^$RELEASE_DIR/,ocdsgen-$VERSION-$ARCH/," \
+      $RELEASE_DIR/ocdsgen
+    echo "Installed $RELEASE_DIR/ocdsgen"
+fi