Generated images not displaying for RMarkdown for Shiny Server on RHEL

[wdkrnls]

My setup is similar to the issue posted here:

Static images not loading in RMarkdown on Shiny Server

...(Hello!) We're deploying a Shiny dashboard using flexdashboard, authoring on R 3.5.1 and RStudio 1.x on Windows 10 and deploying to Shiny Server Pro 1.5.7.x on RHEL. We're using includeHTML to load an HTML file that in turn loads an inline image located in the same directory as both the Rmd and HTML files. That HTML file renders fine in the RStudio browser and when launching the app in desktop browsers. On Shiny Server, however, the image fails to load. This is only a problem for local image files - loading remote images is fine (makes sense, as it's the browser doing that loading). It doesn't look like a permissions issue, as chmodding them liberally doesn't yield anything. I've seen …

I am running Shiny Server using R 3.5.1 on CentOS 7.5. Furthermore, the same thing happens when I try to run RMarkdown with Shiny from RStudio Server 1.2 Preview.

The page loads, but the static ggplot2 image generated by the RMarkdown file shows up as a broken link in the page.

The log file shows the following warnings:

Warning in file.rename(from, to) :
  cannot rename file '/tmp/shinytidy/rmarkdown/ffd833b364179a334684ed3d731da33e/rmd_ffd833b364179a334684ed3d731da33e_files/figure-html' to '/tmp/shinytidy/rmarkdown/ffd833b364179a334684ed3d731da33e//tmp/shinytidy/rmarkdown/ffd833b364179a334684ed3d731da33e/rmd_ffd833b364179a334684ed3d731da33e_files/figure-html', reason 'No such file or directory'

I have found that changing output from html_notebook to html_document causes the image to properly render.

[barret]

@wdkrnls Could you provide your code so that I may explore it some more?

It looks like there is a bad filepath being created. It's almost a concatenation of two paths together:

• /tmp/shinytidy/rmarkdown/ffd833b364179a334684ed3d731da33e//tmp/shinytidy/rmarkdown/ffd833b364179a334684ed3d731da33e/rmd_ffd833b364179a334684ed3d731da33e_files/figure-html
• /tmp/shinytidy/rmarkdown/ffd833b364179a334684ed3d731da33e/ + /tmp/shinytidy/rmarkdown/ffd833b364179a334684ed3d731da33e/rmd_ffd833b364179a334684ed3d731da33e_files/figure-html

This makes me want to believe it's an rmarkdown bug. It would be great to have a small set of code to reproduce this, especially if you can fix it by changing to html_document from html_notebook.