Re-hash packages in the renv cache, ensuring that any previously-cached packages are copied to a new cache location appropriate for this version of renv. This can be useful if the cache scheme has changed in a new version of renv, but you'd like to preserve your previously-cached packages.
rehash(prompt = interactive(), ...)
Any packages which are re-hashed will retain links to the location of the newly-hashed package, ensuring that prior installations of renv can still function as expected.