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#!/bin/sh
die()
{
printf '%s: Error: %s\n' "$0" "$*" >&2
exit 1
}
get_age()
{
local mtime now
mtime=$(stat --format=%Y "$1") || return
now=$(date +%s) || return
echo $(( now - mtime ))
}
get_filesystem()
{
echo /
}
get_total_memory()
{
free -b | {
read _
read _ total _
echo $total
}
}
root_write()
{
$AS_ROOT sh -c 'cat > "$1"' sh "$1" || true
}
join_group()
{
GROUP_DIR="$1"
[ -d "$GROUP_DIR" ] || $AS_ROOT mkdir "$GROUP_DIR"
echo $$ | root_write "$GROUP_DIR"/cgroup.procs
}
add_subtree_controller()
{
local group="$1" controller="$2" control_file
control_file="$group/cgroup.subtree_control"
[ "$group" ] && [ "$controller" ] && [ -d "$group" ] && [ -e "$control_file" ] || return
case "$group" in
/sys/fs/cgroup) ;;
*) add_subtree_controller "$(realpath "$group/..")" "$2" ;;
esac
if ! grep -qe "\\b${controller}\\b" "$control_file"
then
echo +"$controller" | root_write "$control_file"
fi
}
set_max()
{
max_file=$group/$2.max
if [ ! -e "$max_file" ]
then
add_subtree_controller "$1"/.. "$2"
[ -e "$max_file" ] || return
fi
printf '%s\n' "$3" | root_write "$max_file"
}
set_max_ratio()
{
local group="$1" controller="$2" ratio="$3" limit
total=$(get_total_$controller)
n=${ratio%%/*}
d=${ratio#$n/}
[ "$d" = "${d%/*}" ] || return
limit=$(( total * n / d ))
[ "$limit" ] || return
[ "$limit" -gt 0 ] || return
case "$controller" in
io)
fsroot=$(get_filesystem "$IO_ROOT_DIR") || return
# TODO: Do not use lsblk, because it fails to report the correct
# MOUNTPOINT when a bind mount is present.
majmin=$(lsblk -o 'MOUNTPOINT,MAJ:MIN' | sed -ne "s?^$fsroot *??p") || return
case "$majmin" in
*:*) ;;
*) echo "Error: majmin=$majmin" >&2; return 1 ;;
esac
set_max "$group" "$controller" "$majmin wbps=$limit rbps=$limit"
;;
*) set_max "$group" "$controller" "$limit"
esac
}
get_uid()
{
(
if [ "$SUDO_USER" ]
then
IFS=:
set -- $(getent passwd "${SUDO_USER}") || return
echo $3
else
id -u
fi
)
}
get_firefox_cgroup_procs()
{
uid=$(get_uid)
[ "$uid" ] || return
[ "$DISPLAY" ] || return
echo /sys/fs/cgroup/user.slice/user-$uid.slice/user@$uid.service/app.slice/app-firefox.slice/firefox@$DISPLAY.service/cgroup.procs
}
get_current_group()
{
read g < /proc/$$/cgroup
echo /sys/fs/cgroup/${g#0::/}
}
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