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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2024 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package builtin
import "github.com/snapcore/snapd/interfaces"
// The nomad-support interface enables running Hashicorp Nomad within
// a strictly confined snap
// https://www.nomadproject.io/
const nomadSupportSummary = `allows operating as the Hashicorp Nomad service`
const nomadSupportBaseDeclarationPlugs = `
nomad-support:
allow-installation: false
deny-auto-connection: true
`
const nomadSupportBaseDeclarationSlots = `
nomad-support:
allow-installation:
slot-snap-type:
- core
deny-auto-connection: true
`
const nomadSupportConnectedPlugAppArmor = `
# Requirements for Nomad service #
# Discovering cgroup info
/sys/fs/cgroup/cgroup.controllers r,
/sys/fs/cgroup/cgroup.subtree_control rw,
# cpuset management top level
/sys/fs/cgroup/nomad.slice/ rw,
/sys/fs/cgroup/nomad.slice/cpuset.cpus.effective r,
/sys/fs/cgroup/nomad.slice/cgroup.type r,
# Required to allow mkdir /sys/fs/cgroup/nomad.slice/
capability dac_override,
# Required to allow chown task_dir to nobody
capability chown,
# managing our own cgroup config
# https://github.com/hashicorp/nomad/issues/18211
/sys/fs/cgroup/nomad.slice/* rw,
/sys/fs/cgroup/nomad.slice/*.slice/{,**} rw,
/sys/fs/cgroup/nomad.slice/*.scope/{,**} rw,
# setting docker cpuset.cpus
# https://github.com/hashicorp/nomad/blob/v1.8.2/drivers/docker/cpuset.go#L21-L24
/sys/fs/cgroup/system.slice/docker-*.scope/cpuset.cpus rw,
# NVIDIA device plugin
# https://developer.hashicorp.com/nomad/plugins/devices/nvidia
@{PROC}/driver/nvidia/capabilities/mig/config r,
@{PROC}/driver/nvidia/capabilities/mig/monitor r,
`
const nomadSupportConnectedPlugSecComp = `
# Description: allow operating as the nomad daemon
# Filesystem syscalls nomad will need, as it allows user to change
# file owner/group arbitrarily.
chown
chown32
fchown
fchown32
fchownat
lchown
lchownat
`
const nomadSupportServiceSnippet = interfaces.PlugServicesServiceSectionSnippet(`Delegate=true`)
type nomadSupportInterface struct {
commonInterface
}
func init() {
registerIface(&nomadSupportInterface{commonInterface{
name: "nomad-support",
summary: nomadSupportSummary,
implicitOnClassic: true,
implicitOnCore: true,
controlsDeviceCgroup: true,
baseDeclarationPlugs: nomadSupportBaseDeclarationPlugs,
baseDeclarationSlots: nomadSupportBaseDeclarationSlots,
connectedPlugAppArmor: nomadSupportConnectedPlugAppArmor,
connectedPlugSecComp: nomadSupportConnectedPlugSecComp,
serviceSnippets: []interfaces.PlugServicesSnippet{nomadSupportServiceSnippet},
}})
}
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