Fail to sync changed static mounts when mount target is in sub folder

[XhmikosR]

Same as #6165 but now with v0.57.0.

Steps to reproduce:

1. git clone https://github.com/twbs/bootstrap.git -b master-xmr-hugo-reload-error
2. npm i
3. npm run docs-serve
4. Modify any file from the dist folder like dist/css/bootstrap.css

Result:

xmr@xmr-VirtualBox:~/Desktop/bootstrap$ npm run docs-serve

> [email protected] docs-serve /home/xmr/Desktop/bootstrap
> hugo version && hugo server --port 9001 --disableFastRender

Hugo Static Site Generator v0.57.0-9B00E647 linux/amd64 BuildDate: 2019-08-14T08:06:27Z

                   | EN   
+------------------+-----+
  Pages            | 105  
  Paginator pages  |   0  
  Non-page files   |  20  
  Static files     | 125  
  Processed images |   0  
  Aliases          |  16  
  Sitemaps         |   1  
  Cleaned          |   0  

Total in 393 ms
Watching for changes in /home/xmr/Desktop/bootstrap/{dist,site}
Watching for config changes in /home/xmr/Desktop/bootstrap/config.yml
Environment: "development"
Serving pages from memory
Web Server is available at http://localhost:9001/ (bind address 127.0.0.1)
Press Ctrl+C to stop

Change of Static files detected, rebuilding site.
2019-08-14 16:06:50.025 +0300
Syncing /css/bootstrap.css to /
ERROR 2019/08/14 16:06:50 file does not exist

On Windows the path is different but the error the same:

C:\Users\xmr\Desktop\bootstrap>npm run docs-serve

> [email protected] docs-serve C:\Users\xmr\Desktop\bootstrap
> hugo version && hugo server --port 9001 --disableFastRender

Hugo Static Site Generator v0.57.0-9B00E647 windows/amd64 BuildDate: 2019-08-14T08:05:40Z
Building sites …
                   | EN
+------------------+-----+
  Pages            | 105
  Paginator pages  |   0
  Non-page files   |  20
  Static files     | 125
  Processed images |   0
  Aliases          |  16
  Sitemaps         |   1
  Cleaned          |   0

Total in 375 ms
Watching for changes in C:\Users\xmr\Desktop\bootstrap\{dist,site}
Watching for config changes in C:\Users\xmr\Desktop\bootstrap\config.yml
Environment: "development"
Serving pages from memory
Web Server is available at http://localhost:9001/ (bind address 127.0.0.1)
Press Ctrl+C to stop

Change of Static files detected, rebuilding site.
2019-08-14 16:12:22.793 +0300
Syncing \css\bootstrap.css to C:\Users\xmr\Desktop\bootstrap\
ERROR 2019/08/14 16:12:22 file does not exist
ERROR 2019/08/14 16:12:22 file does not exist

[bep]

OK, but this is a different case than #6165, which was:

    - source:           dist
      target:           static/dist

Your setup has "holes" in the directory structure, which makes them somehow unreachable:

    - source:           dist
      target:           static/docs/4.3/dist

Remember that this all ends up in one, big virtual filesystem, which is a tree of directories. I will have a look at this, but it looks a little odd.

[XhmikosR]

Ah, I see. I expected that to work already, but this explains why while investigating dropping the version folder from our structure causes failures.

This specific issue in that branch only affects watch mode; the build seems to be fine.

Thanks for looking into it!

[bep]

OK, a second look tells me that my original patch for this had some assumptions that didn't hold water very long. It's a bug, OK.

[github-actions]

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