Apply thread allocations patch to Ruby 2.7

This makes us to compile Ruby 2.7 manually
and apply relevant patch.

.gitlab-ci.yml

@@ -5,6 +5,7 @@ default:
   before_script:
     - docker login -u "gitlab-ci-token" -p "$CI_JOB_TOKEN" "$CI_REGISTRY"
     - source scripts/build-helpers.sh
+    - apk add -U bash
   tags:
     - gitlab-org-docker
 

Dockerfile.custom

@@ -13,6 +13,12 @@ RUN /scripts/install-essentials
 
 ENV PATH $PATH:/usr/local/go/bin
 
+# Ruby
+ARG RUBY_VERSION
+ARG RUBY_DOWNLOAD_SHA256
+
+RUN if [ -n "$RUBY_VERSION" ]; then /scripts/install-ruby $RUBY_VERSION $RUBY_DOWNLOAD_SHA256 && ruby --version; fi
+
 # Git
 ARG GIT_VERSION
 ARG GIT_DOWNLOAD_URL

scripts/custom-docker-build

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 set -e
 IFS=$'\n\t'
@@ -228,29 +228,38 @@ function print_pgbouncer_args() {
     printf -- "--build-arg PGBOUNCER_DOWNLOAD_SHA256=%s " "$PGBOUNCER_DOWNLOAD_SHA256"
 }
 
-function parse_arguments() {
-    read base
-    read base_version
+function print_ruby_args() {
+    case "$1" in
+        2.6.*)
+            CUSTOM_IMAGE_NAME=debian
+            CUSTOM_IMAGE_VERSION=stretch
+            RUBY_VERSION="2.6.6"
+            RUBY_DOWNLOAD_SHA256="5db187882b7ac34016cd48d7032e197f07e4968f406b0690e20193b9b424841f"
+            ;;
 
-    # Lock Ruby to Debian version to pin OpenSSL version
-    case "$base" in
-        ruby)
-            case "$base_version" in
-                2.6.*)
-                    base_version="$base_version-stretch"
-                    ;;
-                *)
-                    base_version="$base_version-buster"
-                    ;;
-            esac
+        2.7.*)
+            CUSTOM_IMAGE_NAME=debian
+            CUSTOM_IMAGE_VERSION=buster
+            RUBY_VERSION="2.7.2"
+            RUBY_DOWNLOAD_SHA256="1b95ab193cc8f5b5e59d2686cb3d5dcf1ddf2a86cb6950e0b4bdaae5040ec0d6"
+            ;;
+
+        *) echo "Unknown ruby version $1"; exit 1;
     esac
 
-    printf -- "-f Dockerfile.custom " "$base"
-    printf -- "--build-arg CUSTOM_IMAGE_NAME=%s " "$base"
-    printf -- "--build-arg CUSTOM_IMAGE_VERSION=%s " "$base_version"
+    printf -- "--build-arg CUSTOM_IMAGE_NAME=%s " "$CUSTOM_IMAGE_NAME"
+    printf -- "--build-arg CUSTOM_IMAGE_VERSION=%s " "$CUSTOM_IMAGE_VERSION"
+    printf -- "--build-arg RUBY_VERSION=%s " "$RUBY_VERSION"
+    printf -- "--build-arg RUBY_DOWNLOAD_SHA256=%s " "$RUBY_DOWNLOAD_SHA256"
+}
+
+function parse_arguments() {
+    printf -- "-f Dockerfile.custom "
+
     while read image; do
         read version
         case "$image" in
+            ruby) print_ruby_args $version ;;
             golang) print_golang_args $version ;;
             chrome) print_chrome_args $version ;;
             docker) print_docker_args $version ;;

scripts/install-ruby

@@ -1,14 +1,50 @@
 #!/bin/bash
-set -xeuo pipefail
-IFS=$'\n\t'
 
-cd /tmp
-wget http://cache.ruby-lang.org/pub/ruby/2.2/ruby-2.2.2.tar.gz
-tar -xvzf ruby-2.2.2.tar.gz
+set -xeou pipefail
 
-cd ruby-2.2.2
+# Based on https://github.com/docker-library/ruby/blob/master/2.7/buster/Dockerfile
+
+RUBY_VERSION=${1}
+RUBY_MAJOR=${1%.*} # strip last component
+RUBY_DOWNLOAD_SHA256=${2}
+
+RUBY_DOWNLOAD_URL="https://cache.ruby-lang.org/pub/ruby/${RUBY_MAJOR%-rc}/ruby-$RUBY_VERSION.tar.xz"
+
+# Download Ruby
+curl -fsSL "$RUBY_DOWNLOAD_URL" -o ruby.tar.xz
+echo "${RUBY_DOWNLOAD_SHA256} ruby.tar.xz" | sha256sum -c -
+
+# Skip installing Gem docs
+mkdir -p /usr/local/etc
+echo 'install: --no-document' >> /usr/local/etc/gemrc
+echo 'update: --no-document' >> /usr/local/etc/gemrc
+
+# Install needed packages
+apt-get update
+apt-get install -y --no-install-recommends bison dpkg-dev libgdbm-dev ruby
+
+# Unpack Ruby
+mkdir -p /usr/src/ruby
+tar -xJf ruby.tar.xz -C /usr/src/ruby --strip-components=1
+rm ruby.tar.xz
+cd /usr/src/ruby
+
+# Apply patches
+find /patches/ruby/$RUBY_VERSION -name '*.patch' -print0 | xargs -0 -n1 patch -p1 -i
 ./configure --enable-shared --disable-install-doc --disable-install-rdoc --disable-install-capi
-make install -j 3
+make install -j $(nproc)
 
+# Cleanup
 cd /
-rm -rf /tmp/*
+rm -rf /usr/src/ruby
+apt-get purge -y --auto-remove ruby
+
+# Verify
+# verify we have no "ruby" packages installed
+! dpkg -l | grep -i ruby
+[ "$(command -v ruby)" = '/usr/local/bin/ruby' ]
+
+# rough smoke test
+ruby --version
+gem --version
+bundle --version