etc/nsjail/execute.cfg

name: "compiler explorer compilation/tool sandbox"

mode: ONCE
hostname: "ce"

time_limit: 0

log_level: FATAL

rlimit_as_type: INF
rlimit_cpu_type: SOFT
rlimit_fsize: 1024 # 1GB
rlimit_nofile: 100

uidmap {
    inside_id: "10240"
}

gidmap {
    inside_id: "10240"
}

# must run following as root during system startup
# cgcreate -a ubuntu:ubuntu -g memory,pids,cpu,net_cls:ce-compile
cgroup_mem_parent: "ce-compile"
cgroup_pids_parent: "ce-compile"
cgroup_net_cls_parent: "ce-compile"
cgroup_cpu_parent: "ce-compile"

cgroup_mem_max: 1342177280 # 1.25 GiB
cgroup_pids_max: 64  # go uses a bunch (probably one per CPU, on my desktop)
cgroup_cpu_ms_per_sec: 1000

mount {
    src: "/bin"
    dst: "/bin"
    is_bind: true
}

mount {
    src: "/lib"
    dst: "/lib"
    is_bind: true
}

mount {
    src: "/usr"
    dst: "/usr"
    is_bind: true
}

mount {
    src: "/etc/localtime"
    dst: "/etc/localtime"
    is_bind: true
}
mount {
    src_content: "notroot:x:65534:65534:Not root:/root:/none\nce:x:10240:10240:Not a real account:/app:/bin/bash"
    dst: "/etc/passwd"
    is_bind: true
}
mount {
    src_content: "notroot:x:65534:\n\nce:x:10240:"
    dst: "/etc/group"
    is_bind: true
}
mount {
    # this password hash is here intentionally, and is not actually used for anything
    src_content: "ce:$1$rockyou$hty8SH9lK4mcCQXKENxaa1:18723:0:99999:7:::"
    dst: "/etc/shadow"
    is_bind: true
}

mount {
    src: "/lib64"
    dst: "/lib64"
    is_bind: true
    mandatory: false
}

mount {
    src: "/lib32"
    dst: "/lib32"
    is_bind: true
    mandatory: false
}

mount {
    dst: "/tmp"
    fstype: "tmpfs"
    options: "size=134217728,nr_inodes=100" # 128MiB
    rw: true
    noexec: true
    nodev: true
    nosuid: true
}

mount {
    src: "/dev/null"
    dst: "/dev/null"
    rw: true
    is_bind: true
}

mount {
    src: "/dev/zero"
    dst: "/dev/zero"
    is_bind: true
}

mount {
    src: "/dev/urandom"
    dst: "/dev/random"
    is_bind: true
}

mount {
    src: "/dev/urandom"
    dst: "/dev/urandom"
    is_bind: true
}

mount {
    dst: "/proc"
    fstype: "proc"
}

mount {
    src: "/opt/compiler-explorer"
    dst: "/opt/compiler-explorer"
    is_bind: true
}

# Needed for icc
mount {
    src: "/opt/intel"
    dst: "/opt/intel"
    is_bind: true
    mandatory: false
}

# Needed for ARM non-free compilers
mount {
    src: "/opt/arm"
    dst: "/opt/arm"
    is_bind: true
    mandatory: false
}

# Needed for things with shim scripts e.g. Python
mount {
    src: "/infra/.deploy/etc/scripts"
    dst: "/infra/.deploy/etc/scripts"
    is_bind: true
    mandatory: false
}