chore: update code logic optimization

update

@@ -50,15 +50,30 @@ function download_and_unzip() {
 function install_backend_and_download_resources() {
     # 清理临时目录，上次安装失败可能有残留
     rm -rf /tmp/*
-    if download_and_unzip "${GITHUB_PROXY}https://github.com/jxxghp/MoviePilot/archive/refs/${1}" "App"; then
+    if ! download_and_unzip "${GITHUB_PROXY}https://github.com/jxxghp/MoviePilot/archive/refs/${1}" "App"; then
+        WARN "后端程序下载失败，继续使用旧的程序来启动..."
+        return 1
+    fi
     INFO "后端程序下载成功"
     INFO "依赖安装中..."
-        pip install ${PIP_OPTIONS} --upgrade --root-user-action=ignore pip > /dev/null
+    if ! pip install ${PIP_OPTIONS} --upgrade --root-user-action=ignore pip > /dev/null; then
-        if pip install ${PIP_OPTIONS} --root-user-action=ignore -r /tmp/App/requirements.txt > /dev/null; then
+        ERROR "pip 更新失败，请重新拉取镜像"
+        return 1
+    fi
+    if ! pip install ${PIP_OPTIONS} --root-user-action=ignore -r /tmp/App/requirements.txt > /dev/null; then
+        ERROR "安装依赖失败，请重新拉取镜像"
+        return 1
+    fi
     INFO "安装依赖成功"
     frontend_version=$(curl ${CURL_OPTIONS} "https://api.github.com/repos/jxxghp/MoviePilot-Frontend/releases/latest" ${CURL_HEADERS} | jq -r .tag_name)
-            if [[ "${frontend_version}" == *v* ]]; then
+    if [[ "${frontend_version}" != *v* ]]; then
-                if download_and_unzip "${GITHUB_PROXY}https://github.com/jxxghp/MoviePilot-Frontend/releases/download/${frontend_version}/dist.zip" "dist"; then
+        WARN "前端最新版本号获取失败，继续启动..."
+        return 1
+    fi
+    if ! download_and_unzip "${GITHUB_PROXY}https://github.com/jxxghp/MoviePilot-Frontend/releases/download/${frontend_version}/dist.zip" "dist"; then
+        WARN "前端程序下载失败，继续使用旧的程序来启动..."
+        return 1
+    fi
     INFO "前端程序下载成功"
     # 提前备份插件目录
     INFO "备份插件目录中..."
@@ -85,7 +100,12 @@ function install_backend_and_download_resources() {
     rm -rf /tmp/*
     INFO "程序部分更新成功，前端版本：${frontend_version}，后端版本：${1}"
     INFO "开始更新插件..."
-                    if download_and_unzip "${GITHUB_PROXY}https://github.com/jxxghp/MoviePilot-Plugins/archive/refs/heads/main.zip" "Plugins"; then
+    if ! download_and_unzip "${GITHUB_PROXY}https://github.com/jxxghp/MoviePilot-Plugins/archive/refs/heads/main.zip" "Plugins"; then
+        cp -a /plugins/* /app/app/plugins/
+        rm -rf /plugins
+        WARN "插件下载失败，继续使用旧的插件来启动..."
+        return 1
+    fi
     INFO "插件下载成功"
     # 恢复插件目录
     cp -a /plugins/* /app/app/plugins/
@@ -97,35 +117,19 @@ function install_backend_and_download_resources() {
     rm -rf /tmp/*
     INFO "插件更新成功"
     INFO "开始更新资源包..."
-                        if download_and_unzip "${GITHUB_PROXY}https://github.com/jxxghp/MoviePilot-Resources/archive/refs/heads/main.zip" "Resources"; then
+    if ! download_and_unzip "${GITHUB_PROXY}https://github.com/jxxghp/MoviePilot-Resources/archive/refs/heads/main.zip" "Resources"; then
+        cp -a /resources_bakcup/* /app/app/helper/
+        rm -rf /resources_bakcup
+        WARN "资源包下载失败，继续使用旧的资源包来启动..."
+        return 1
+    fi
     INFO "资源包下载成功"
     # 资源包
     cp -a /tmp/Resources/resources/* /app/app/helper/
     # 清理临时目录
     rm -rf /tmp/*
     INFO "资源包更新成功"
-                        else
+    return 0
-                            cp -a /resources_bakcup/* /app/app/helper/
-                            rm -rf /resources_bakcup
-                            WARN "资源包下载失败，继续使用旧的资源包来启动..."
-                        fi
-                    else
-                        cp -a /plugins/* /app/app/plugins/
-                        rm -rf /plugins
-                        WARN "插件下载失败，继续使用旧的插件来启动..."
-                    fi
-                else
-                    WARN "前端程序下载失败，继续使用旧的程序来启动..."
-                fi
-            else
-                WARN "前端最新版本号获取失败，继续启动..."
-            fi
-        else
-            ERROR "安装依赖失败，请重新拉取镜像"
-        fi
-    else
-        WARN "后端程序下载失败，继续使用旧的程序来启动..."
-    fi
 }
 
 function test_connectivity_pip() {