Use system copy of libuv if found

.github/workflows/R-CMD-check.yaml

@@ -6,7 +6,6 @@ on:
   push:
     branches: [main, rc-**]
   pull_request:
-    branches: [main]
   schedule:
     - cron: '0 6 * * 1' # every monday
 

.github/workflows/system-libuv.yaml

@@ -0,0 +1,79 @@
+# Need help debugging build failures? Start at https://github.com/r-lib/actions#where-to-find-help
+on:
+  push:
+    branches: [main, rc-**]
+  pull_request:
+  schedule:
+    - cron: '0 6 * * 1' # every monday
+
+name: Test system libuv
+
+jobs:
+  R-CMD-check:
+    # Ubuntu 22.04 has libuv1-dev version 1.43, which is sufficient
+    runs-on: ubuntu-latest
+    name: Installed=${{ matrix.config.install }} Bundled=${{ matrix.config.use }}
+    strategy:
+      fail-fast: false
+      matrix:
+        config:
+          # This one should test that we've used system and everything runs ok
+          - {install: true}
+          # This one should test for bundling log message
+          - {install: true, use: true}
+          # This one should test for failure
+          - {install: false, use: false}
+
+    env:
+      GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
+      R_KEEP_PKG_SOURCE: yes
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: r-lib/actions/setup-r@v2
+        with:
+          use-public-rspm: true
+
+      - uses: r-lib/actions/setup-r-dependencies@v2
+        with:
+          extra-packages: any::rcmdcheck
+          needs: check
+
+      - name: Install libuv
+        if: ${{ matrix.config.install }}
+        # If we add tests for e.g. rhel/centos, we couldn't assume apt-get
+        run: |
+          sudo apt-get update -y
+          sudo apt-get install -y libuv1-dev
+
+      - name: Ensure libuv is not on the system
+        if: ${{ !matrix.config.install }}
+        run: |
+          sudo apt-get remove -y libuv1-dev || true
+
+      - uses: r-lib/actions/check-r-package@v2
+        if: ${{ matrix.config.install }}
+        env:
+          USE_BUNDLED_LIBUV: ${{ matrix.config.use }}
+        with:
+          upload-snapshots: true
+
+      - name: Confirm that USE_BUNDLED_LIBUV was respected
+        if: ${{ matrix.config.install }}
+        env:
+          USE_BUNDLED_LIBUV: ${{ matrix.config.use }}
+        run: |
+          if [ "$USE_BUNDLED_LIBUV" = "true" ]; then
+            grep "Using bundled copy of libuv" check/httpuv.Rcheck/00install.out
+          else
+            grep "Using libuv found by pkg-config" check/httpuv.Rcheck/00install.out
+          fi
+
+      - name: Confirm error if system libuv missing and use=false
+        if: ${{ !matrix.config.install && !matrix.config.use }}
+        env:
+          USE_BUNDLED_LIBUV: ${{ matrix.config.use }}
+        run: |
+          R CMD INSTALL . > install.log || true
+          grep "Did not find suitable libuv on your system" install.log

.gitignore

@@ -13,4 +13,8 @@ src/httpuv.files
 src/httpuv.includes
 .Rproj.user
 CRAN-RELEASE
-httpuv_*.tar.gz
+httpuv_*.tar.gz
+src/Makevars
+configure.log
+.vscode
+*.orig

README.md

@@ -24,6 +24,7 @@ remotes::install_github("rstudio/httpuv")
 
 Since httpuv contains C code, you'll need to make sure you're set up to install packages with compiled code. Follow the instructions at http://www.rstudio.com/ide/docs/packages/prerequisites
 
+httpuv may optionally be built using a `libuv` system package, which you can install prior to installing the R package. It goes by different names on different package managers: `libuv1-dev` (deb), `libuv-devel` (rpm), `libuv` (brew). Version 1.43 or greater is required. If `libuv` is not found on the system, it will be built from source along with the R package.
 
 ## Basic Usage
 

cleanup

@@ -0,0 +1,3 @@
+#!/usr/bin/env sh
+
+rm -f src/Makevars configure.log

configure

@@ -0,0 +1,45 @@
+#!/usr/bin/env sh
+
+PKG_CONFIG_NAME="libuv"
+LIBUV_VERSION_REQUIRED="$PKG_CONFIG_NAME >= 1.43 $PKG_CONFIG_NAME < 2"
+
+# If unset (default), will try to find libuv on system and fall back to bundled
+# If true (case insensitive), will not look for system library
+# If false, will not fall back to bundled if system library not found
+USE_BUNDLED_LIBUV=`echo $USE_BUNDLED_LIBUV | tr '[:upper:]' '[:lower:]'`
+
+if [ `uname -s` = "Darwin" ]; then
+  # Always do static linking on macOS
+  PKG_CONFIG="pkg-config --static"
+else
+  PKG_CONFIG="pkg-config"
+fi
+
+# First, look for suitable libuv installed on the system 
+if [ "${USE_BUNDLED_LIBUV}" != "true" ] && ${PKG_CONFIG} --exists ''"${LIBUV_VERSION_REQUIRED}"'' 2>&1; then
+  echo "** Using libuv found by pkg-config in `${PKG_CONFIG} --variable=prefix --silence-errors ${PKG_CONFIG_NAME}`"
+  PKG_CFLAGS=`${PKG_CONFIG} --cflags --silence-errors ${PKG_CONFIG_NAME}`
+  PKG_LIBS=`${PKG_CONFIG} --libs ${PKG_CONFIG_NAME}`
+  DEPS=""
+elif [ "${USE_BUNDLED_LIBUV}" != "false" ]; then
+  # If not found, use the bundled copy (unless directed otherwise)
+  echo "** Using bundled copy of libuv"
+  PKG_CFLAGS="-Ilibuv/include"
+  PKG_LIBS="./libuv/.libs/libuv.a"
+  # By setting DEPS, this triggers the libuv build in src/Makevars
+  DEPS="libuv/.libs/libuv.a"
+else
+  echo "** Did not find suitable libuv on your system,"
+  echo "** and not building from source because USE_BUNDLED_LIBUV=false."
+  echo "** Please install ${LIBUV_VERSION_REQUIRED} or unset USE_BUNDLED_LIBUV"
+  exit 1
+fi
+
+# For debugging
+echo "** PKG_CFLAGS=$PKG_CFLAGS"
+echo "** PKG_LIBS=$PKG_LIBS"
+# Write to Makevars
+sed -e "s|@cflags@|$PKG_CFLAGS|" -e "s|@libs@|$PKG_LIBS|" -e "s|@deps@|$DEPS|" src/Makevars.in > src/Makevars
+
+# Success
+exit 0

src/Makevars → src/Makevars.in

@@ -1,6 +1,6 @@
 UNAME := $(shell uname)
 
-PKG_LIBS = ./libuv/.libs/libuv.a ./http-parser/http_parser.o ./sha1/sha1.o ./base64/base64.o -pthread
+PKG_LIBS = @libs@ ./http-parser/http_parser.o ./sha1/sha1.o ./base64/base64.o -pthread
 
 ifeq ($(UNAME), Darwin)
 PKG_LIBS += -framework CoreServices
@@ -18,7 +18,7 @@ endif
 
 PKG_CFLAGS = $(C_VISIBILITY) -DSTRICT_R_HEADERS
 PKG_CXXFLAGS = $(CXX_VISIBILITY) -DSTRICT_R_HEADERS
-PKG_CPPFLAGS = -Ilibuv/include -pthread
+PKG_CPPFLAGS = @cflags@ -pthread
 
 # To avoid spurious warnings from `R CMD check --as-cran`, about compiler
 # warning flags like -Werror.
@@ -38,7 +38,7 @@ CONFIGURE_FLAGS="--quiet"
 # PKG_CPPFLAGS += -D_GLIBCXX_ASSERTIONS
 
 
-$(SHLIB): libuv/.libs/libuv.a http-parser/http_parser.o sha1/sha1.o base64/base64.o
+$(SHLIB): @deps@ http-parser/http_parser.o sha1/sha1.o base64/base64.o
 
 # We needed to rename lt~obsolete.m4 because the name causes problems with R
 # CMD check. Here we rename it back.