diff --git a/build.sh b/build.sh
index ac33c6e..0c75988 100755
--- a/build.sh
+++ b/build.sh
@@ -8,12 +8,36 @@ set -e
 #   - HY_APP_COMMIT: App commit hash
 #   - HY_APP_PLATFORMS: Platforms to build for (e.g. "windows/amd64,linux/amd64,darwin/amd64")
 
+export LC_ALL=C
+export LC_DATE=C
+
+has_command() {
+    local cmd="$1"
+    type -P "$cmd" > /dev/null 2>&1
+}
+
+if ! has_command go; then
+    echo 'Error: go is not installed.' >&2
+    exit 1
+fi
+
+if ! has_command git; then
+    echo 'Error: git is not installed.' >&2
+    exit 1
+fi
+
+if ! git rev-parse --is-inside-work-tree >/dev/null 2>&1; then
+    echo 'Error: not in a git repository.' >&2
+    exit 1
+fi
+
+
 platform_to_env() {
-    local os=$1
-    local arch=$2
+    local os="$1"
+    local arch="$2"
     local env="GOOS=$os GOARCH=$arch CGO_ENABLED=0"
 
-    case $arch in
+    case "$arch" in
     arm)
         env+=" GOARM= GOARCH=arm"
         ;;
@@ -43,39 +67,54 @@ platform_to_env() {
         ;;
     esac
 
-    echo $env
+    echo "$env"
 }
 
-if ! [ -x "$(command -v go)" ]; then
-    echo 'Error: go is not installed.' >&2
-    exit 1
-fi
+make_ldflags() {
+    local ldflags="-s -w -X 'main.appDate=$(date -u '+%F %T')'"
+    if [ -n "$HY_APP_VERSION" ]; then
+        ldflags="$ldflags -X 'main.appVersion=$HY_APP_VERSION'"
+    else
+        ldflags="$ldflags -X 'main.appVersion=$(git describe --tags --always --match 'v*')'"
+    fi
+    if [ -n "$HY_APP_COMMIT" ]; then
+        ldflags="$ldflags -X 'main.appCommit=$HY_APP_COMMIT'"
+    else
+        ldflags="$ldflags -X 'main.appCommit=$(git rev-parse HEAD)'"
+    fi
+    echo "$ldflags"
+}
 
-if ! [ -x "$(command -v git)" ]; then
-    echo 'Error: git is not installed.' >&2
-    exit 1
-fi
-if ! git rev-parse --is-inside-work-tree >/dev/null 2>&1; then
-    echo 'Error: not in a git repository.' >&2
-    exit 1
-fi
+build_for_platform() {
+    local platform="$1"
+    local ldflags="$2"
+
+    local GOOS="${platform%/*}"
+    local GOARCH="${platform#*/}"
+    if [[ -z "$GOOS" || -z "$GOARCH" ]]; then
+        echo "Invalid platform $platform" >&2
+        return 1
+    fi
+    echo "Building $GOOS/$GOARCH"
+    local output="build/hysteria-$GOOS-$GOARCH"
+    if [[ "$GOOS" = "windows" ]]; then
+        output="$output.exe"
+    fi
+    local envs="$(platform_to_env "$GOOS" "$GOARCH")"
+    local exit_val=0
+    env $envs go build -o "$output" -tags=gpl -ldflags "$ldflags" -trimpath ./app/cmd/ || exit_val=$?
+    if [[ "$exit_val" -ne 0 ]]; then
+        echo "Error: failed to build $GOOS/$GOARCH" >&2
+        return $exit_val
+    fi
+}
 
-ldflags="-s -w -X 'main.appDate=$(date -u '+%F %T')'"
-if [ -n "$HY_APP_VERSION" ]; then
-    ldflags="$ldflags -X 'main.appVersion=$HY_APP_VERSION'"
-else
-    ldflags="$ldflags -X 'main.appVersion=$(git describe --tags --always)'"
-fi
-if [ -n "$HY_APP_COMMIT" ]; then
-    ldflags="$ldflags -X 'main.appCommit=$HY_APP_COMMIT'"
-else
-    ldflags="$ldflags -X 'main.appCommit=$(git rev-parse HEAD)'"
-fi
 
 if [ -z "$HY_APP_PLATFORMS" ]; then
     HY_APP_PLATFORMS="$(go env GOOS)/$(go env GOARCH)"
 fi
 platforms=(${HY_APP_PLATFORMS//,/ })
+ldflags="$(make_ldflags)"
 
 mkdir -p build
 rm -rf build/*
@@ -83,19 +122,7 @@ rm -rf build/*
 echo "Starting build..."
 
 for platform in "${platforms[@]}"; do
-    GOOS=${platform%/*}
-    GOARCH=${platform#*/}
-    echo "Building $GOOS/$GOARCH"
-    output="build/hysteria-$GOOS-$GOARCH"
-    if [ $GOOS = "windows" ]; then
-        output="$output.exe"
-    fi
-    envs=$(platform_to_env $GOOS $GOARCH)
-    env $envs go build -o $output -tags=gpl -ldflags "$ldflags" -trimpath ./app/cmd/
-    if [ $? -ne 0 ]; then
-        echo "Error: failed to build $GOOS/$GOARCH"
-        exit 1
-    fi
+    build_for_platform "$platform" "$ldflags"
 done
 
 echo "Build complete."