linux - 如何在 Alpine Linux 上运行 Angular6 E2E 测试

Question

尝试使用 Alpine Linux 运行 E2E 测试时我们有以下神秘错误:

E/launcher - spawn (...)/selenium/chromedriver_2.40 ENOENT

如何重现

docker run -it --name my-alpine --rm alpine:latest /bin/ash
apk add --update nodejs nodejs-npm chromium \
    && export CHROME_BIN=/usr/bin/chromium-browser

npm install -g @angular/cli
ng new testAlpine
cd testAlpine
ng e2e

结果

[14:10:54] I/file_manager - creating folder /testAlpine/node_modules/protractor/node_modules/webdriver-manager/selenium
ℹ ｢wdm｣: Compiled successfully.
[14:10:54] I/update - chromedriver: unzipping chromedriver_2.40.zip
[14:10:55] I/update - chromedriver: setting permissions to 0755 for /testAlpine/node_modules/protractor/node_modules/webdriver-manager/selenium/chromedriver_2.40
(node:121) [DEP0022] DeprecationWarning: os.tmpDir() is deprecated. Use os.tmpdir() instead.
[14:10:55] I/launcher - Running 1 instances of WebDriver
[14:10:55] I/direct - Using ChromeDriver directly...
[14:10:55] E/launcher - spawn /testAlpine/node_modules/protractor/node_modules/webdriver-manager/selenium/chromedriver_2.40 ENOENT
[14:10:55] E/launcher - Error: spawn /testAlpine/node_modules/protractor/node_modules/webdriver-manager/selenium/chromedriver_2.40 ENOENT
    at _errnoException (util.js:1024:11)
    at Process.ChildProcess._handle.onexit (internal/child_process.js:190:19)
    at onErrorNT (internal/child_process.js:372:16)
    at _combinedTickCallback (internal/process/next_tick.js:138:11)
    at process._tickCallback (internal/process/next_tick.js:180:9)
[14:10:55] E/launcher - Process exited with error code 199
An unexpected error occured: undefined

一些调查细节

假设 Protractor 使用Nodejs spawn function ，我们尝试从 ash 运行命令，结果是一条“未找到”的消息!稍微研究一下发现这可能与缺少动态链接库有关。

为了验证假设，我们安装了binutils检查动态链接依赖性。

apk add --update binutils
readelf -l /testAlpine/node_modules/protractor/node_modules/webdriver-manager/selenium/chromedriver_2.40

并且结果显示了 Alpine Linux 中不存在的依赖性，

/lib64/ld-linux-x86-64.so.2

Elf file type is EXEC (Executable file)
Entry point 0x490000
There are 11 program headers, starting at offset 64

Program Headers:
  Type           Offset             VirtAddr           PhysAddr
                 FileSiz            MemSiz              Flags  Align
  PHDR           0x0000000000000040 0x0000000000200040 0x0000000000200040
                 0x0000000000000268 0x0000000000000268  R      0x8
  INTERP         0x00000000000002a8 0x00000000002002a8 0x00000000002002a8
                 0x000000000000001c 0x000000000000001c  R      0x1
      [Requesting program interpreter: /lib64/ld-linux-x86-64.so.2]
  LOAD           0x0000000000000000 0x0000000000200000 0x0000000000200000
                 0x000000000028f27c 0x000000000028f27c  R      0x1000
  LOAD           0x0000000000290000 0x0000000000490000 0x0000000000490000

尝试使用 webdriver-manager 获取更新的 chrome 驱动程序版本也没有效果。下载的版本有同样的问题。

npm install -g webdriver-manager

webdriver-manager update
webdriver-manager: using global installed version 12.0.6
[14:30:20] I/file_manager - creating folder /usr/lib/node_modules/webdriver-manager/selenium
[14:30:21] I/update - chromedriver: unzipping chromedriver_2.40.zip
[14:30:21] I/update - chromedriver: setting permissions to 0755 for /usr/lib/node_modules/webdriver-manager/selenium/chromedriver_2.40

/testAlpine # /usr/lib/node_modules/webdriver-manager/selenium/chromedriver_2.40
/bin/ash: /usr/lib/node_modules/webdriver-manager/selenium/chromedriver_2.40: not found

随机数

• 作为Alpine Linux moved to musl libc是否有必要重建 chromeDriver 来使用它？

Answer 1

需要使用 musl libc 重建 chromedriver 或使用 alpine repos 中的 chromedriver 包，您可以使用 apk add --no-cache chromedriver 安装它。

您还需要告诉 Protractor 使用正确的二进制文件 chromeDriver: '/usr/bin/chromedriver' 在你的 Protractor 配置中。