lkp-exec/install: update bundler version to support various ruby

Issue appears on centos 7 when doing lkp install.

Fetching: bundler-2.3.26.gem (100%)
ERROR:  Error installing bundler:
        bundler requires Ruby version >= 2.3.0.
/root/lkp-tests/lkp-exec/install: line 344: bundle: command not found

Signed-off-by: Yujie Liu <yujie.liu@intel.com>
Signed-off-by: Philip Li <philip.li@intel.com>

lkp-exec/install

@@ -322,6 +322,17 @@ install_fakeroot()
 	fi
 }
 
+is_ruby_version_ge()
+{
+	local other_version=$1
+	# ruby 2.0.0p648 (2015-12-16) [x86_64-linux]
+	local ruby_version=$(ruby --version | grep -oE "[0-9]+\.[0-9]+\.[0-9]+")
+
+	local higher_version=$(echo -e "$other_version\n$ruby_version" | sort -V | tail -n1)
+
+	[ "$ruby_version" = "$higher_version" ]
+}
+
 install_base_support()
 {
 	install_packages "lkp" "$distro"
@@ -331,16 +342,34 @@ install_base_support()
 		install_fakeroot
 	fi
 
+	# https://bundler.io/compatibility.html
+	# Bundler compatibility with Ruby & RubyGems
+	# The latest Bundler release should always support, at the very least, all rubies that have not yet reached their End of Life date.
+	# The latest Bundler release should always support all RubyGems versions higher than or equal to the one shipped with the oldest Ruby version supported. RubyGems is not allowed to be downgraded further than that, so upgrading or downgrading RubyGems should not affect Bundler.
+	# That effectively comes down to the following:
+	# Bundler 2.4 or higher
+	# 	requires a minimum ruby version of 2.6.0, and a minimum RubyGems version of 3.0.1 (version of RubyGems shipped with ruby 2.6.0).
+	# Bundler 2.0 through 2.3
+	# 	requires a minimum ruby version of 2.3.0, and a minimum RubyGems version of 2.5 (version of RubyGems shipped with ruby 2.3.0).
+	# Bundler 1
+	# 	Requires a minimum Ruby version of 1.8.7, and a minimum RubyGems version of 1.3.6 (version of RubyGems shipped with ruby 1.8.7).
+
+	local bundler_version
+	if is_ruby_version_ge "3.2.0"; then
+		# bundler-1.17.3/lib/bundler/shared_helpers.rb:35: warning: Pathname#untaint is deprecated and will be removed in Ruby 3.2.
+		bundler_version="2.3.26"
+	else
+		# install bundler 1 to support ruby 2.0.0 at minimum
+		bundler_version="1.17.3"
+	fi
+
 	if [ -n "$CHINA" ]; then
-		gem install bundler -v 2.3.26 --clear-sources -s https://gems.ruby-china.com/
+		gem install bundler -v $bundler_version --clear-sources -s https://gems.ruby-china.com/
 		bundle_install_china
 	else
 		(
 			cd $LKP_SRC || exit
-			# install 2.3.26 to avoid below error when ruby is < 2.6.0
-			# 	ERROR:  Error installing bundler:
-			# 	bundler requires Ruby version >= 2.6.0.
-			gem install bundler -v 2.3.26
+			gem install bundler -v $bundler_version
 			bundle install
 		)
 	fi