Object cache_dir not found

[netique]

Hi, I've encountered an error using sass with bslib when running an app at shiny server:

Warning: Error in warning: object 'cache_dir' not found
  [No stack trace available]

Note this disappeared with options(sass.cache = FALSE).

I cannot find what could be the cause, I suspected some file permissions, but restricting write and/or read rights of the cache directory raised a different, expected error.

[cpsievert]

Any chance you can provide us with a reproducible example?

[netique]

The problem is that I have limited access to the server where shiny-server lives. But recently, I have been provided with this log, which may be helpful:

Warning in loadSupport(appDir, renv = sharedEnv, globalrenv = NULL) :
  Loading R/ subdirectory for Shiny application, but this directory appears to contain an R package. Sourcing files in R/ may cause unexpected behavior.
ℹ Loading edutest

Listening on http://127.0.0.1:38709
Warning: Error in warning: object 'cache_dir' not found
  87: warning
  86: value[[3L]]
  85: tryCatchOne
  84: tryCatchList
  83: tryCatch
  82: sass_cache_context_dir
  81: sass_cache_get
  79: sass::sass_partial
  78: bs_get_contrast
  77: navs_bar
  72: page_navbar
  69: ui [/opt/shiny/my_app/R/app_ui.R#8]

Thing is that I cannot reproduce this behaviour elsewhere. But from the traceback, the issue may lie somewhere in sass_cache_context_dir(). Hope this helps at least a bit.

EDIT:
I think I have found the issue. At

sass/R/sass_cache.R

Lines 192 to 193 in 8852117

	cache_dir <<- tempfile("sass-")
	dir.create(cache_dir)

a tempfile is created and on the server of concern, this may fail. The global assignment in turn cannot be made.