Ensure supporting files are writeable #800
Merged
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This is related to rstudio/htmltools#68.
Rmarkdown copies dependencies to a temporary directory and tries to remove the directory afterwards. When a dependency's file mode was set to 444 at package installation time (as is the case on Guix), the copied file cannot be removed by R.
Setting
copy.mode
toFALSE
ensures that the files can be removed by the user (or by the same R process at a later point).