From 74e19122523fba10357bb16ebcc6639701776145 Mon Sep 17 00:00:00 2001
From: Postmodern <postmodern.mod3@gmail.com>
Date: Mon, 23 Jan 2023 16:22:54 -0800
Subject: [PATCH] Added support for the `RUBY_INSTALL_PKG_MANAGER` env
 variable.

---
 share/ruby-install/system.sh                  |  5 +++
 .../detect_package_manager_test.sh            | 37 ++++++++++++++++---
 2 files changed, 37 insertions(+), 5 deletions(-)

diff --git a/share/ruby-install/system.sh b/share/ruby-install/system.sh
index 982c7e20..8ac20ade 100644
--- a/share/ruby-install/system.sh
+++ b/share/ruby-install/system.sh
@@ -24,6 +24,11 @@ function detect_sudo()
 #
 function detect_package_manager()
 {
+	if [[ -n "$RUBY_INSTALL_PKG_MANAGER" ]]; then
+		package_manager="$RUBY_INSTALL_PKG_MANAGER"
+		return
+	fi
+
 	case "$os_platform" in
 		Linux)
 			if [[ -f /etc/redhat-release ]]; then
diff --git a/test/system-tests/detect_package_manager_test.sh b/test/system-tests/detect_package_manager_test.sh
index db69d3e2..dc356ed2 100755
--- a/test/system-tests/detect_package_manager_test.sh
+++ b/test/system-tests/detect_package_manager_test.sh
@@ -3,15 +3,12 @@
 . ./test/helper.sh
 . ./share/ruby-install/system.sh
 
-function oneTimeSetUp()
-{
-	detect_package_manager
-}
-
 function test_detect_package_manager_on_redhat_based_systems_with_dnf()
 {
 	[[ -f /etc/redhat-release ]] && command -v dnf >/dev/null || return 0
 
+	detect_package_manager
+
 	assertEquals "did not prefer dnf over yum" "dnf" "$package_manager"
 }
 
@@ -21,6 +18,8 @@ function test_detect_package_manager_on_redhat_based_systems_with_yum()
 		! command -v dnf >/dev/null &&
 		command -v yum >/dev/null || return 0
 
+	detect_package_manager
+
 	assertEquals "did not fallback to yum" "yum" "$package_manager"
 }
 
@@ -29,6 +28,8 @@ function test_detect_package_manager_on_debian_based_systems_with_apt()
 	[[ -f /etc/debian_version ]] && command -v apt >/dev/null || \
 		return 0
 
+	detect_package_manager
+
 	assertEquals "did not detect apt" "apt" "$package_manager"
 }
 
@@ -36,6 +37,8 @@ function test_detect_package_manager_on_open_suse_systems_with_zypper()
 {
 	[[ -f /etc/SuSE-release ]] && command -v zypper >/dev/null || return 0
 
+	detect_package_manager
+
 	assertEquals "did not detect zypper" "zypper" "$package_manager"
 }
 
@@ -43,6 +46,8 @@ function test_detect_package_manager_on_bsd_systems_with_pkg()
 {
 	[[ "$os_platform" == *BSD ]] && command -v pkg >/dev/null || return 0
 
+	detect_package_manager
+
 	assertEquals "did not detect pkg" "pkg" "$package_manager"
 }
 
@@ -51,6 +56,8 @@ function test_detect_package_manager_on_macos_systems_with_homebrew()
 	[[ "$os_platform" == *Darwin ]] && command -v brew >/dev/null || \
 		return 0
 
+	detect_package_manager
+
 	assertEquals "did not prefer brew over port" "brew" "$package_manager"
 }
 
@@ -60,7 +67,27 @@ function test_detect_package_manager_on_macos_systems_with_macports()
 		! command -v brew >/dev/null &&
 		command -v port >/dev/null || return 0
 
+	detect_package_manager
+
 	assertEquals "did not fallback to macports" "port" "$package_manager"
 }
 
+function test_detect_package_manager_when_RUBY_INSTALL_PKG_MANAGER_is_set()
+{
+	RUBY_INSTALL_PKG_MANAGER="custom"
+
+	detect_package_manager
+
+	assertEquals "did not set package_manager to $$RUBY_INSTALL_PKG_MANAGER" \
+		     "$RUBY_INSTALL_PKG_MANAGER" "$package_manager"
+		
+
+	unset RUBY_INSTALL_PKG_MANAGER
+}
+
+function tearDown()
+{
+	unset package_manager
+}
+
 SHUNIT_PARENT=$0 . $SHUNIT2