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#!/bin/bash
command=iceweasel
memory_ratio=0.5
control_group=$command
as_root=sudo
total_memory() { free -b | (read line; read Mem total _; echo $total); }
mkdir_idem() { [ -d "$1" ] || $as_root mkdir "$1"; }
out() { $as_root tee "$@" >/dev/null; }
total_memory=$(total_memory) || exit 1
memory_limit_in_bytes=$(bc -q <<< "$total_memory * $memory_ratio / 1" )
control_group_dir=/sys/fs/cgroup/memory/"$control_group"
mkdir_idem "$control_group_dir"
out "$control_group_dir"/memory.limit_in_bytes <<< $memory_limit_in_bytes
# This method works (tested).
# username=$(id -u)
# exec sudo -E -- cgexec -g memory:"$control_group" -- su "$username" -c "exec $command"
# This method is untested. Should work the same.
out "$control_group_dir"/cgroup.procs <<< $$
exec $command
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