Drop support for Ruby 3.0

Primarily because it doesn't support Process._fork, but also because
it's been EOL for many months.

.github/workflows/ci.yml

@@ -50,7 +50,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu, macos, windows]
-        ruby: ["3.3", "3.2", "3.1", "3.0"]
+        ruby: ["3.3", "3.2", "3.1"]
         syslib: [enable, disable]
         include:
           # additional compilation flags for homebrew
@@ -122,7 +122,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu, macos, windows]
-        ruby: ["3.3", "3.0"] # oldest and newest
+        ruby: ["3.3", "3.1"] # oldest and newest
         include:
           - { os: windows, ruby: mingw }
           - { os: windows, ruby: mswin }
@@ -213,7 +213,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu, macos, windows]
-        ruby: ["3.3", "3.2", "3.1", "3.0"]
+        ruby: ["3.3", "3.2", "3.1"]
         syslib: [enable, disable]
         include:
           # additional compilation flags for homebrew
@@ -284,7 +284,7 @@ jobs:
           - x86-linux-musl
           - x86_64-linux-gnu
           - x86_64-linux-musl
-        ruby: ["3.3", "3.2", "3.1", "3.0"]
+        ruby: ["3.3", "3.2", "3.1"]
         include:
           # declare docker image for each platform
           - { platform: aarch64-linux-musl, docker_tag: "-alpine", bootstrap: "apk add build-base &&" }
@@ -322,15 +322,12 @@ jobs:
       fail-fast: false
       matrix:
         os: [windows-latest, macos-13, macos-14]
-        ruby: ["3.3", "3.2", "3.1", "3.0"]
+        ruby: ["3.3", "3.2", "3.1"]
         include:
           - os: macos-13
             platform: x86_64-darwin
           - os: macos-14
             platform: arm64-darwin
-          - os: windows-latest
-            ruby: "3.0"
-            platform: x64-mingw32
           - os: windows-latest
             ruby: "3.1"
             platform: x64-mingw-ucrt
@@ -359,7 +356,6 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - { ruby: "3.0", flavor: "alpine" }
           - { ruby: "3.1", flavor: "alpine3.18" }
           - { ruby: "3.1", flavor: "alpine3.19" }
           - { ruby: "3.2", flavor: "alpine3.18" }
@@ -376,6 +372,4 @@ jobs:
           name: cruby-x86_64-linux-musl-gem
           path: gems
       - run: apk add build-base
-      - if: matrix.ruby == '3.0' # https://github.com/rake-compiler/rake-compiler/pull/236
-        run: gem update --system
       - run: ./bin/test-gem-install ./gems

.rubocop.yml

@@ -13,7 +13,7 @@ inherit_gem:
 
 AllCops:
   SuggestExtensions: false
-  TargetRubyVersion: 3.0
+  TargetRubyVersion: 3.1
 
 Naming/InclusiveLanguage:
   Enabled: true

CHANGELOG.md

@@ -2,9 +2,21 @@
 
 ## next / unreleased
 
-### Changed
+### Ruby
+
+- This release drops support for Ruby 3.0.
+
+
+### Fork safety improvements
+
+Sqlite itself is [not fork-safe](https://www.sqlite.org/howtocorrupt.html#_carrying_an_open_database_connection_across_a_fork_). Specifically, writing in a child process to a database connection that was created in the parent process may corrupt the database file. To mitigate this risk, sqlite3-ruby has implemented the following changes:
+
+- Open writable database connections carried across a `fork()` will immediately be closed in the child process to mitigate the risk of corrupting the database file.
+- These connections will be incompletely closed ("discarded") which will result in a one-time memory leak in the child process.
+
+If it's at all possible, we strongly recommend that you close writable database connections in the parent before forking.
 
-- Any database connections carried across a `fork()` will not be fully closed to help protect database files against corruption. Using a database connection in a child process that was created in a parent process is unsafe and may corrupt the database file. If an inherited connection is closed then a warning will be emitted and some reserved memory will be lost to the child process permanently. See the README "Fork Safety" section and `adr/2024-09-fork-safety.md` for more information. [#558] @flavorjones
+See the README "Fork Safety" section and `adr/2024-09-fork-safety.md` for more information. [#558] @flavorjones
 
 
 ### Improved

INSTALLATION.md

@@ -21,8 +21,6 @@ In v2.0.0 and later, native (precompiled) gems are available for recent Ruby ver
 - `x86_64-linux-gnu` (requires: glibc >= 2.17)
 - `x86_64-linux-musl`
 
-⚠ Ruby 3.0 linux users must use Rubygems >= 3.3.22 in order to use these gems.
-
 ⚠ Musl linux users should update to Bundler >= 2.5.6 to avoid https://github.com/rubygems/rubygems/issues/7432
 
 If you are using one of these Ruby versions on one of these platforms, the native gem is the recommended way to install sqlite3-ruby.

bin/test-gem-file-contents

@@ -65,22 +65,7 @@ Minitest::Reporters.use!([Minitest::Reporters::SpecReporter.new])
 
 puts "Testing '#{gemfile}' (#{gemspec.platform})"
 describe File.basename(gemfile) do
-  let(:all_supported_ruby_versions) {
-    ["3.0", "3.1", "3.2", "3.3"]
-  }
-  let(:native_supported_ruby_versions) { ["3.0", "3.1", "3.2", "3.3"] }
-  let(:ucrt_supported_ruby_versions) { ["3.1", "3.2", "3.3"] }
-  let(:platform_supported_ruby_versions) do
-    if gemspec.platform.to_s == "x64-mingw-ucrt"
-      ucrt_supported_ruby_versions
-    elsif gemspec.platform.to_s == "x64-mingw32"
-      native_supported_ruby_versions - ucrt_supported_ruby_versions
-    elsif gemspec.platform.cpu
-      native_supported_ruby_versions
-    else
-      all_supported_ruby_versions
-    end
-  end
+  let(:supported_ruby_versions) { ["3.1", "3.2", "3.3"] }
 
   describe "setup" do
     it "gemfile contains some files" do
@@ -147,7 +132,7 @@ describe File.basename(gemfile) do
       end
 
       it "sets required_ruby_version appropriately" do
-        all_supported_ruby_versions.each do |v|
+        supported_ruby_versions.each do |v|
           assert(
             gemspec.required_ruby_version.satisfied_by?(Gem::Version.new(v)),
             "required_ruby_version='#{gemspec.required_ruby_version}' should support ruby #{v}"
@@ -181,7 +166,7 @@ describe File.basename(gemfile) do
       end
 
       it "contains expected shared library files " do
-        platform_supported_ruby_versions.each do |version|
+        supported_ruby_versions.each do |version|
           actual = gemfile_contents.find do |p|
             File.fnmatch?("lib/sqlite3/#{version}/sqlite3_native.{so,bundle}", p, File::FNM_EXTGLOB)
           end
@@ -197,26 +182,19 @@ describe File.basename(gemfile) do
           File.fnmatch?("lib/sqlite3/**/*.{so,bundle}", p, File::FNM_EXTGLOB)
         end
         assert_equal(
-          platform_supported_ruby_versions.length,
+          supported_ruby_versions.length,
           actual.length,
           "did not expect extra shared library files"
         )
       end
 
       it "sets required_ruby_version appropriately" do
-        unsupported_versions = all_supported_ruby_versions - platform_supported_ruby_versions
-        platform_supported_ruby_versions.each do |v|
+        supported_ruby_versions.each do |v|
           assert(
             gemspec.required_ruby_version.satisfied_by?(Gem::Version.new(v)),
             "required_ruby_version='#{gemspec.required_ruby_version}' should support ruby #{v}"
           )
         end
-        unsupported_versions.each do |v|
-          refute(
-            gemspec.required_ruby_version.satisfied_by?(Gem::Version.new(v)),
-            "required_ruby_version='#{gemspec.required_ruby_version}' should not support ruby #{v}"
-          )
-        end
       end
 
       it "does not set metadata for msys2" do

rakelib/native.rake

@@ -6,7 +6,7 @@ require "rake/extensiontask"
 require "rake_compiler_dock"
 require "yaml"
 
-cross_rubies = ["3.3.0", "3.2.0", "3.1.0", "3.0.0"]
+cross_rubies = ["3.3.0", "3.2.0", "3.1.0"]
 cross_platforms = [
   "aarch64-linux-gnu",
   "aarch64-linux-musl",

sqlite3.gemspec

@@ -18,7 +18,7 @@ Gem::Specification.new do |s|
 
   s.licenses = ["BSD-3-Clause"]
 
-  s.required_ruby_version = Gem::Requirement.new(">= 3.0")
+  s.required_ruby_version = Gem::Requirement.new(">= 3.1")
 
   s.homepage = "https://github.com/sparklemotion/sqlite3-ruby"
   s.metadata = {

test/test_database.rb

@@ -727,7 +727,6 @@ class TestDiscardDatabase < SQLite3::TestCase
     def test_fork_discards_an_open_readwrite_connection
       skip("interpreter doesn't support fork") unless Process.respond_to?(:fork)
       skip("valgrind doesn't handle forking") if i_am_running_in_valgrind
-      skip("ruby 3.0 doesn't have Process._fork") if RUBY_VERSION < "3.1.0"
 
       GC.start
       begin