From efee4ebf43e376a7cd8b8abcef0c70aa90427bb4 Mon Sep 17 00:00:00 2001
From: davidovski <david@davidovski.xyz>
Date: Tue, 1 Mar 2022 22:01:26 +0000
Subject: initial commit
---
s6/scripts/mount-cgroups | 120 +++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 120 insertions(+)
create mode 100755 s6/scripts/mount-cgroups
(limited to 's6/scripts/mount-cgroups')
diff --git a/s6/scripts/mount-cgroups b/s6/scripts/mount-cgroups
new file mode 100755
index 0000000..fd711a0
--- /dev/null
+++ b/s6/scripts/mount-cgroups
@@ -0,0 +1,120 @@
+#!/bin/sh
+
+CGROUP_OPTS=nodev,noexec,nosuid
+CGROUP_MODE=$1
+CGROUP_CONTROLLERS=$2
+HAVE_CONTROLLER1_GROUPS=$3
+
+#if [ $CGROUP_CONTROLLERS = "none" ]; then
+# CGROUP_CONTROLLERS=""
+#fi
+
+cgroup2_find_path() {
+ if grep -qw cgroup2 /proc/filesystems; then
+ case "${CGROUP_MODE}" in
+ hybrid) printf "/sys/fs/cgroup/unified" ;;
+ unified) printf "/sys/fs/cgroup" ;;
+ esac
+ fi
+ return 0
+}
+
+cgroup1_base() {
+ grep -qw cgroup /proc/filesystems || return 0
+ if ! mountpoint -q /sys/fs/cgroup; then
+ local opts="${CGROUP_OPTS},mode=755,size=${rc_cgroupsize:-10m}"
+ mount -n -t tmpfs -o "${opts}" cgroup_root /sys/fs/cgroup
+ fi
+
+ if ! mountpoint -q /sys/fs/cgroup/openrc; then
+ local agent="/etc/s6/sv/mount-cgroups/cgroup-release-agent.sh"
+ mkdir /sys/fs/cgroup/openrc
+ mount -n -t cgroup -o none,${CGROUP_OPTS},name=openrc,release_agent="$agent" openrc /sys/fs/cgroup/openrc
+ printf 1 > /sys/fs/cgroup/openrc/notify_on_release
+ fi
+ return 0
+}
+
+cgroup1_controllers() {
+ ${HAVE_CONTROLLER1_GROUPS} && [ -e /proc/cgroups ] && grep -qw cgroup /proc/filesystems || return 0
+ while read -r name _ _ enabled _; do
+ case "${enabled}" in
+ 1) if mountpoint -q "/sys/fs/cgroup/${name}";then continue;fi
+ local x
+ for x in $CGROUP_CONTROLLERS; do
+ [ "${name}" = "blkio" ] && [ "${x}" = "io" ] &&
+ continue 2
+ [ "${name}" = "${x}" ] &&
+ continue 2
+ done
+ mkdir "/sys/fs/cgroup/${name}"
+ mount -n -t cgroup -o "${CGROUP_OPTS},${name}" "${name}" "/sys/fs/cgroup/${name}"
+ ;;
+ esac
+ done < /proc/cgroups
+ return 0
+}
+
+cgroup2_base() {
+ grep -qw cgroup2 /proc/filesystems || return 0
+ local base
+ base="$(cgroup2_find_path)"
+ mkdir -p "${base}"
+ mount -t cgroup2 none -o "${CGROUP_OPTS},nsdelegate" "${base}" 2> /dev/null ||
+ mount -t cgroup2 none -o "${CGROUP_OPTS}" "${base}"
+ return 0
+}
+
+cgroup2_controllers() {
+ grep -qw cgroup2 /proc/filesystems || return 0
+ local active cgroup_path x y
+ cgroup_path="$(cgroup2_find_path)"
+ [ -z "${cgroup_path}" ] && return 0
+ [ -e "${cgroup_path}/cgroup.controllers" ] && read -r active < "${cgroup_path}/cgroup.controllers"
+ for x in ${CGROUP_CONTROLLERS}; do
+ for y in ${active}; do
+ [ "$x" = "$y" ] && [ -e "${cgroup_path}/cgroup.subtree_control" ] &&
+ echo "+${x}" > "${cgroup_path}/cgroup.subtree_control"
+ done
+ done
+ return 0
+}
+
+cgroups_hybrid() {
+ cgroup1_base
+ cgroup2_base
+ cgroup2_controllers
+ cgroup1_controllers
+ return 0
+}
+
+cgroups_legacy() {
+ cgroup1_base
+ cgroup1_controllers
+ return 0
+}
+
+cgroups_unified() {
+ cgroup2_base
+ cgroup2_controllers
+ return 0
+}
+
+mount_cgroups() {
+ case "${CGROUP_MODE}" in
+ hybrid) cgroups_hybrid ;;
+ legacy) cgroups_legacy ;;
+ unified) cgroups_unified ;;
+ esac
+ return 0
+}
+
+mount_cgs() {
+ if [ -d /sys/fs/cgroup ];then
+ mount_cgroups
+ return 0
+ fi
+ return 1
+}
+
+mount_cgs
--
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