Issue: Incorrect environment variable usage in Quarto version check

[rhetor]

Problem Description
When running devtools::check(), the function attempts to check Quarto version using this call:
system2("quarto", "-V", stdout = TRUE, env = paste0("TMPDIR=", temp_dir))

This results in an error:
ERROR: Unknown command "TMPDIR=C:/Users/Administrator/AppData/Local/Temp/Rtmp8m27id/file6e845241f5f". Did you mean command "install"?

Root Cause
The env parameter is being misused. The code passes env = paste0("TMPDIR=", temp_dir) which causes the system to interpret "TMPDIR=path" as a command argument to Quarto rather than setting an environment variable.

Expected Behavior
Checking Quarto version should simply be:
system2("quarto", "-V", stdout = TRUE)
The env parameter is unnecessary for a basic version check and causes the command to fail.

Environment

• R version 4.5.2 (2025-10-31 ucrt)
• devtools version: 2.4.6
• Quarto version: 1.8.26
• OS: Windows 10 x64 (build 19045)

Steps to Reproduce

• Have Quarto properly installed and in PATH
• Create an R package with Quarto documentation
• Run devtools::check()
• Observe the error with TMPDIR being treated as a Quarto command

Proposed Fix
Remove the unnecessary env parameter from the Quarto version check call, or use proper environment variable setting with c(TMPDIR = temp_dir) if environment variables are truly needed.

[jennybc]

The code re: Quarto doesn't live in devtools, but rather in sessioninfo and is getting called indirectly from devtools::check(). It's been fixed in sessioninfo, but I don't think the fix is in a CRAN release yet.

r-lib/sessioninfo#122

[rhetor]

thanks ， I didn't notice it before.