copy renv cache in multi stage build

Author: SumedhSankhe

Dockerfile.multistage

@@ -73,14 +73,19 @@ COPY --from=builder /build/renv /app/renv
 COPY --from=builder /build/.Rprofile /app/.Rprofile
 COPY --from=builder /build/renv.lock /app/renv.lock
 
+# Copy the renv cache (symlinks in renv/library point to this cache)
+COPY --from=builder /root/.cache/R/renv /root/.cache/R/renv
+
 # Copy application code
 COPY --from=builder /build/app.R /app/app.R
 
 # Expose Shiny port
 EXPOSE 3838
 
 # Run the application
-CMD ["R", "-e", "shiny::runApp('/app', host = '0.0.0.0', port = 3838)"]
+# Note: Use --vanilla to skip .Rprofile and avoid renv activation at runtime
+# The renv library path is already in R's search path
+CMD ["R", "--vanilla", "-e", ".libPaths('/app/renv/library/linux-ubuntu-noble/R-4.4/x86_64-pc-linux-gnu'); shiny::runApp('/app', host = '0.0.0.0', port = 3838)"]
 
 # ============================================================================
 # Build and Run Commands:

Dockerfile.single-stage

@@ -39,4 +39,6 @@ RUN R -e "renv::restore()"
 EXPOSE 3838
 
 # Run the application
-CMD ["R", "-e", "shiny::runApp('/app', host = '0.0.0.0', port = 3838)"]
+# Note: Use --vanilla to skip .Rprofile and avoid renv activation at runtime
+# The renv library path is already in R's search path
+CMD ["R", "--vanilla", "-e", ".libPaths('/app/renv/library/linux-ubuntu-noble/R-4.4/x86_64-pc-linux-gnu'); shiny::runApp('/app', host = '0.0.0.0', port = 3838)"]

Dockerfile.three-stage

@@ -108,6 +108,9 @@ COPY --from=base /base/renv /app/renv
 COPY --from=base /base/.Rprofile /app/.Rprofile
 COPY --from=base /base/renv.lock /app/renv.lock
 
+# Copy the renv cache (symlinks in renv/library point to this cache)
+COPY --from=base /root/.cache/R/renv /root/.cache/R/renv
+
 # Copy custom packages from builder stage (if any were installed)
 # COPY --from=builder /usr/local/lib/R/site-library/mypackage /usr/local/lib/R/site-library/mypackage
 
@@ -118,7 +121,9 @@ COPY --from=builder /build/app.R /app/app.R
 EXPOSE 3838
 
 # Run the application
-CMD ["R", "-e", "shiny::runApp('/app', host = '0.0.0.0', port = 3838)"]
+# Note: Use --vanilla to skip .Rprofile and avoid renv activation at runtime
+# The renv library path is already in R's search path
+CMD ["R", "--vanilla", "-e", ".libPaths('/app/renv/library/linux-ubuntu-noble/R-4.4/x86_64-pc-linux-gnu'); shiny::runApp('/app', host = '0.0.0.0', port = 3838)"]
 
 # ============================================================================
 # Layer Optimization Strategy: