@vuepress/plugin-last-updated crashes on GitLab Pages

[Ambyjkl]

• I confirm that this is a issue rather than a question.

Bug report

@vuepress/plugin-last-updated uses the git command's stdout output to determine when a particular file was updated. But the issue is, for some reason on GitLab, spawn.sync.stdout is null, which causes the function to throw an error "Cannot read property toString of null".

Version

The latest version as of now 1.0.0-alpha.22

Steps to reproduce

1. Create a vuepress project on gitlab
2. Trigger vuepress build on the Gitlab CI environment.

Here's my repo for reference, with the failing build:

https://gitlab.com/Ambyjkl/strange-dreams/-/jobs/120764389

What is expected?

The build succeeds

What is actually happening?

The build fails with aforementioned error.

Other relevant information

I think it's due to some funny business in the communication from a process inside a docker container to a one outside (I'm not quite sure how that happens, I'm still in the process of figuring it out)

• Your OS: Alpine Linux (CI environment)
• Node.js version: 10.12.0 (node:alpine)
• Browser version: Doesn't matter in this case
• Is this a global or local install? Local
• Which package manager did you use for the install? npm

[ulivz]

I just made sure the build passes in 2a4e37f, but last-updated will not be available in your build context because there is no git in your build context.

To solve this, please ensure that you are using git clone to pull your source code.