在闪亮的应用程序中使用tinytex查找本地sty文件的问题

Question

在使用.sty在闪亮的应用程序中生成pdf报告时，我找不到本地tinytex文件。

基本闪亮的应用程序：

shinyApp(
  ui = fluidPage(
    sliderInput("slider", "Slider", 1, 100, 50),
    downloadButton("report", "Generate report")
  ),
  server = function(input, output) {
    output$report <- downloadHandler(
      # For PDF output, change this to "report.pdf"
      filename = "report.html",
      content = function(file) {
        # Copy the report file to a temporary directory before processing it, in
        # case we don't have write permissions to the current working dir (which
        # can happen when deployed).
        tempReport <- file.path(tempdir(), "report.Rmd")
        file.copy("report.Rmd", tempReport, overwrite = TRUE)

        # Set up parameters to pass to Rmd document
        params <- list(n = input$slider)

        # Knit the document, passing in the `params` list, and eval it in a
        # child of the global environment (this isolates the code in the document
        # from the code in this app).
        rmarkdown::render(tempReport, output_file = file,
                          params = params,
                          envir = new.env(parent = globalenv())
        )
      }
    )
  }
)

报告文件报告。Rmd：

---
title: ' '
author: ' '
output: 
  pdf_document: 
    number_sections: false
    fig_caption: false
header-includes: 
  - \usepackage{titlepage}
fontsize:
  12pt
geometry: "left = 0.6in, right = 0.6in, top = 0.8in, bottom = 0.8in"
params: 
  n: NA
---

```{r}
options(tinytex.verbose = TRUE)
# The `params` object is available in the document.
params$n
```

A plot of `params$n` random points.

```{r}
plot(rnorm(params$n), rnorm(params$n))
```

错误：

tlmgr search --file --global "/titlepage.sty"
Warning in parse_packages(logfile, quiet = c(TRUE, FALSE, FALSE)) :
  Failed to find a package that contains titlepage.sty
! LaTeX Error: File `titlepage.sty' not found.

! Emergency stop.
<read *> 

xfun::session_info('rmarkdown')的输出：

R version 3.6.0 (2019-04-26)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 10 x64 (build 17134), RStudio 1.2.1335

Locale:
  LC_COLLATE=Czech_Czechia.1250  LC_CTYPE=Czech_Czechia.1250    LC_MONETARY=Czech_Czechia.1250 LC_NUMERIC=C                  
  LC_TIME=Czech_Czechia.1250    

Package version:
  base64enc_0.1.3 digest_0.6.19   evaluate_0.13   glue_1.3.1      graphics_3.6.0  grDevices_3.6.0 highr_0.8       htmltools_0.3.6
  jsonlite_1.6    knitr_1.23      magrittr_1.5    markdown_0.9    methods_3.6.0   mime_0.6        Rcpp_1.0.1      rmarkdown_1.12 
  stats_3.6.0     stringi_1.4.3   stringr_1.4.0   tinytex_0.13    tools_3.6.0     utils_3.6.0     xfun_0.7        yaml_2.2.0     

Pandoc version: 2.6

文件titlepage.sty与app.R和report.Rmd位于同一目录中。