1 files changed, 120 insertions, 0 deletions
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