From c3ebd755b9e0b042b06ade6daaeacbf39a86895e Mon Sep 17 00:00:00 2001
From: IceCodeNew <32576256+IceCodeNew@users.noreply.github.com>
Date: Fri, 25 Sep 2020 14:29:53 +0800
Subject: [PATCH] Introduce a more convenient way to detect systemd

Refer: https://manpages.ubuntu.com/manpages/focal/en/man3/sd_booted.3.html
---
 install-release.sh | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/install-release.sh b/install-release.sh
index 4aec23e..96597c7 100644
--- a/install-release.sh
+++ b/install-release.sh
@@ -93,7 +93,14 @@ identify_the_operating_system_and_architecture() {
       echo "error: Don't use outdated Linux distributions."
       exit 1
     fi
-    if [[ -z "$(ls -l /sbin/init | grep systemd)" ]]; then
+    # Do not combine this judgment condition with the following judgment condition.
+    ## Be aware of Linux distribution like Gentoo, which kernel supports switch between Systemd and OpenRC.
+    ### Refer: https://github.com/v2fly/fhs-install-v2ray/issues/84#issuecomment-688574989
+    if [[ -f /.dockerenv ]] || grep -q 'docker\|lxc' /proc/1/cgroup && [[ "$(type -P systemctl)" ]]; then
+      true
+    elif [[ -d /run/systemd/system ]] || grep -q systemd <(ls -l /sbin/init); then
+      true
+    else
       echo "error: Only Linux distributions using systemd are supported."
       exit 1
     fi