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env.go
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env.go
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package taskenv
import (
"fmt"
"net"
"os"
"strconv"
"strings"
"sync"
"github.com/hashicorp/nomad/helper"
hargs "github.com/hashicorp/nomad/helper/args"
"github.com/hashicorp/nomad/nomad/structs"
"github.com/hashicorp/nomad/plugins/drivers"
"github.com/zclconf/go-cty/cty"
)
// A set of environment variables that are exported by each driver.
const (
// AllocDir is the environment variable with the path to the alloc directory
// that is shared across tasks within a task group.
AllocDir = "NOMAD_ALLOC_DIR"
// TaskLocalDir is the environment variable with the path to the tasks local
// directory where it can store data that is persisted to the alloc is
// removed.
TaskLocalDir = "NOMAD_TASK_DIR"
// SecretsDir is the environment variable with the path to the tasks secret
// directory where it can store sensitive data.
SecretsDir = "NOMAD_SECRETS_DIR"
// MemLimit is the environment variable with the tasks memory limit in MBs.
MemLimit = "NOMAD_MEMORY_LIMIT"
// CpuLimit is the environment variable with the tasks CPU limit in MHz.
CpuLimit = "NOMAD_CPU_LIMIT"
// AllocID is the environment variable for passing the allocation ID.
AllocID = "NOMAD_ALLOC_ID"
// AllocName is the environment variable for passing the allocation name.
AllocName = "NOMAD_ALLOC_NAME"
// TaskName is the environment variable for passing the task name.
TaskName = "NOMAD_TASK_NAME"
// GroupName is the environment variable for passing the task group name.
GroupName = "NOMAD_GROUP_NAME"
// JobName is the environment variable for passing the job name.
JobName = "NOMAD_JOB_NAME"
// AllocIndex is the environment variable for passing the allocation index.
AllocIndex = "NOMAD_ALLOC_INDEX"
// Datacenter is the environment variable for passing the datacenter in which the alloc is running.
Datacenter = "NOMAD_DC"
// Region is the environment variable for passing the region in which the alloc is running.
Region = "NOMAD_REGION"
// AddrPrefix is the prefix for passing both dynamic and static port
// allocations to tasks.
// E.g $NOMAD_ADDR_http=127.0.0.1:80
//
// The ip:port are always the host's.
AddrPrefix = "NOMAD_ADDR_"
// IpPrefix is the prefix for passing the host IP of a port allocation
// to a task.
IpPrefix = "NOMAD_IP_"
// PortPrefix is the prefix for passing the port allocation to a task.
// It will be the task's port if a port map is specified. Task's should
// bind to this port.
PortPrefix = "NOMAD_PORT_"
// HostPortPrefix is the prefix for passing the host port when a port
// map is specified.
HostPortPrefix = "NOMAD_HOST_PORT_"
// MetaPrefix is the prefix for passing task meta data.
MetaPrefix = "NOMAD_META_"
// VaultToken is the environment variable for passing the Vault token
VaultToken = "VAULT_TOKEN"
// VaultNamespace is the environment variable for passing the Vault namespace, if applicable
VaultNamespace = "VAULT_NAMESPACE"
)
// The node values that can be interpreted.
const (
nodeIdKey = "node.unique.id"
nodeDcKey = "node.datacenter"
nodeRegionKey = "node.region"
nodeNameKey = "node.unique.name"
nodeClassKey = "node.class"
// Prefixes used for lookups.
nodeAttributePrefix = "attr."
nodeMetaPrefix = "meta."
)
// TaskEnv is a task's environment as well as node attribute's for
// interpolation.
type TaskEnv struct {
// NodeAttrs is the map of node attributes for interpolation
NodeAttrs map[string]string
// EnvMap is the map of environment variables
EnvMap map[string]string
// deviceEnv is the environment variables populated from the device hooks.
deviceEnv map[string]string
// envList is a memoized list created by List()
envList []string
}
// NewTaskEnv creates a new task environment with the given environment, device
// environment and node attribute maps.
func NewTaskEnv(env, deviceEnv, node map[string]string) *TaskEnv {
return &TaskEnv{
NodeAttrs: node,
deviceEnv: deviceEnv,
EnvMap: env,
}
}
// NewEmptyTaskEnv creates a new empty task environment.
func NewEmptyTaskEnv() *TaskEnv {
return &TaskEnv{
NodeAttrs: make(map[string]string),
deviceEnv: make(map[string]string),
EnvMap: make(map[string]string),
}
}
// List returns the task's environment as a slice of NAME=value pair strings.
func (t *TaskEnv) List() []string {
if t.envList != nil {
return t.envList
}
env := []string{}
for k, v := range t.EnvMap {
env = append(env, fmt.Sprintf("%s=%s", k, v))
}
return env
}
// DeviceEnv returns the task's environment variables set by device hooks.
func (t *TaskEnv) DeviceEnv() map[string]string {
m := make(map[string]string, len(t.deviceEnv))
for k, v := range t.deviceEnv {
m[k] = v
}
return m
}
// Map of the task's environment variables.
func (t *TaskEnv) Map() map[string]string {
m := make(map[string]string, len(t.EnvMap))
for k, v := range t.EnvMap {
m[k] = v
}
return m
}
// All of the task's environment variables and the node's attributes in a
// single map.
func (t *TaskEnv) All() map[string]string {
m := make(map[string]string, len(t.EnvMap)+len(t.NodeAttrs))
for k, v := range t.EnvMap {
m[k] = v
}
for k, v := range t.NodeAttrs {
m[k] = v
}
return m
}
// AllValues is a map of the task's environment variables and the node's
// attributes with cty.Value (String) values. Errors including keys are
// returned in a map by key name.
//
// In the rare case of a fatal error, only an error value is returned. This is
// likely a programming error as user input should not be able to cause a fatal
// error.
func (t *TaskEnv) AllValues() (map[string]cty.Value, map[string]error, error) {
errs := make(map[string]error)
// Intermediate map for building up nested go types
allMap := make(map[string]interface{}, len(t.EnvMap)+len(t.NodeAttrs))
// Intermediate map for all env vars including those whose keys that
// cannot be nested (eg foo...bar)
envMap := make(map[string]cty.Value, len(t.EnvMap))
// Prepare job-based variables (eg job.meta, job.group.task.env, etc)
for k, v := range t.EnvMap {
if err := addNestedKey(allMap, k, v); err != nil {
errs[k] = err
}
envMap[k] = cty.StringVal(v)
}
// Prepare node-based variables (eg node.*, attr.*, meta.*)
for k, v := range t.NodeAttrs {
if err := addNestedKey(allMap, k, v); err != nil {
errs[k] = err
}
}
// Add flat envMap as a Map to allMap so users can access any key via
// HCL2's indexing syntax: ${env["foo...bar"]}
allMap["env"] = cty.MapVal(envMap)
// Add meta and attr to node if they exist to properly namespace things
// a bit.
nodeMapI, ok := allMap["node"]
if !ok {
return nil, nil, fmt.Errorf("missing node variable")
}
nodeMap, ok := nodeMapI.(map[string]interface{})
if !ok {
return nil, nil, fmt.Errorf("invalid type for node variable: %T", nodeMapI)
}
if attrMap, ok := allMap["attr"]; ok {
nodeMap["attr"] = attrMap
}
if metaMap, ok := allMap["meta"]; ok {
nodeMap["meta"] = metaMap
}
// ctyify the entire tree of strings and maps
tree, err := ctyify(allMap)
if err != nil {
// This should not be possible and is likely a programming
// error. Invalid user input should be cleaned earlier.
return nil, nil, err
}
return tree, errs, nil
}
// ParseAndReplace takes the user supplied args replaces any instance of an
// environment variable or Nomad variable in the args with the actual value.
func (t *TaskEnv) ParseAndReplace(args []string) []string {
if args == nil {
return nil
}
replaced := make([]string, len(args))
for i, arg := range args {
replaced[i] = hargs.ReplaceEnv(arg, t.EnvMap, t.NodeAttrs)
}
return replaced
}
// ReplaceEnv takes an arg and replaces all occurrences of environment variables
// and Nomad variables. If the variable is found in the passed map it is
// replaced, otherwise the original string is returned.
func (t *TaskEnv) ReplaceEnv(arg string) string {
return hargs.ReplaceEnv(arg, t.EnvMap, t.NodeAttrs)
}
// Builder is used to build task environment's and is safe for concurrent use.
type Builder struct {
// envvars are custom set environment variables
envvars map[string]string
// templateEnv are env vars set from templates
templateEnv map[string]string
// hostEnv are environment variables filtered from the host
hostEnv map[string]string
// nodeAttrs are Node attributes and metadata
nodeAttrs map[string]string
// taskMeta are the meta attributes on the task
taskMeta map[string]string
// allocDir from task's perspective; eg /alloc
allocDir string
// localDir from task's perspective; eg /local
localDir string
// secretsDir from task's perspective; eg /secrets
secretsDir string
cpuLimit int64
memLimit int64
taskName string
allocIndex int
datacenter string
region string
allocId string
allocName string
groupName string
vaultToken string
vaultNamespace string
injectVaultToken bool
jobName string
// otherPorts for tasks in the same alloc
otherPorts map[string]string
// driverNetwork is the network defined by the driver (or nil if none
// was defined).
driverNetwork *drivers.DriverNetwork
// network resources from the task; must be lazily turned into env vars
// because portMaps and advertiseIP can change after builder creation
// and affect network env vars.
networks []*structs.NetworkResource
// hookEnvs are env vars set by hooks and stored by hook name to
// support adding/removing vars from multiple hooks (eg HookA adds A:1,
// HookB adds A:2, HookA removes A, A should equal 2)
hookEnvs map[string]map[string]string
// hookNames is a slice of hooks in hookEnvs to apply hookEnvs in the
// order the hooks are run.
hookNames []string
// deviceHookName is the device hook name. It is set only if device hooks
// are set. While a bit round about, this enables us to return device hook
// environment variables without having to hardcode the name of the hook.
deviceHookName string
mu *sync.RWMutex
}
// NewBuilder creates a new task environment builder.
func NewBuilder(node *structs.Node, alloc *structs.Allocation, task *structs.Task, region string) *Builder {
b := NewEmptyBuilder()
b.region = region
return b.setTask(task).setAlloc(alloc).setNode(node)
}
// NewEmptyBuilder creates a new environment builder.
func NewEmptyBuilder() *Builder {
return &Builder{
mu: &sync.RWMutex{},
hookEnvs: map[string]map[string]string{},
envvars: make(map[string]string),
}
}
// Build must be called after all the tasks environment values have been set.
func (b *Builder) Build() *TaskEnv {
nodeAttrs := make(map[string]string)
envMap := make(map[string]string)
var deviceEnvs map[string]string
b.mu.RLock()
defer b.mu.RUnlock()
// Add the directories
if b.allocDir != "" {
envMap[AllocDir] = b.allocDir
}
if b.localDir != "" {
envMap[TaskLocalDir] = b.localDir
}
if b.secretsDir != "" {
envMap[SecretsDir] = b.secretsDir
}
// Add the resource limits
if b.memLimit != 0 {
envMap[MemLimit] = strconv.FormatInt(b.memLimit, 10)
}
if b.cpuLimit != 0 {
envMap[CpuLimit] = strconv.FormatInt(b.cpuLimit, 10)
}
// Add the task metadata
if b.allocId != "" {
envMap[AllocID] = b.allocId
}
if b.allocName != "" {
envMap[AllocName] = b.allocName
}
if b.groupName != "" {
envMap[GroupName] = b.groupName
}
if b.allocIndex != -1 {
envMap[AllocIndex] = strconv.Itoa(b.allocIndex)
}
if b.taskName != "" {
envMap[TaskName] = b.taskName
}
if b.jobName != "" {
envMap[JobName] = b.jobName
}
if b.datacenter != "" {
envMap[Datacenter] = b.datacenter
}
if b.region != "" {
envMap[Region] = b.region
// Copy region over to node attrs
nodeAttrs[nodeRegionKey] = b.region
}
// Build the network related env vars
buildNetworkEnv(envMap, b.networks, b.driverNetwork)
// Build the addr of the other tasks
for k, v := range b.otherPorts {
envMap[k] = v
}
// Build the Vault Token
if b.injectVaultToken && b.vaultToken != "" {
envMap[VaultToken] = b.vaultToken
}
// Build the Vault Namespace
if b.injectVaultToken && b.vaultNamespace != "" {
envMap[VaultNamespace] = b.vaultNamespace
}
// Copy task meta
for k, v := range b.taskMeta {
envMap[k] = v
}
// Copy node attributes
for k, v := range b.nodeAttrs {
nodeAttrs[k] = v
}
// Interpolate and add environment variables
for k, v := range b.hostEnv {
envMap[k] = hargs.ReplaceEnv(v, nodeAttrs, envMap)
}
// Copy interpolated task env vars second as they override host env vars
for k, v := range b.envvars {
envMap[k] = hargs.ReplaceEnv(v, nodeAttrs, envMap)
}
// Copy hook env vars in the order the hooks were run
for _, h := range b.hookNames {
for k, v := range b.hookEnvs[h] {
e := hargs.ReplaceEnv(v, nodeAttrs, envMap)
envMap[k] = e
if h == b.deviceHookName {
if deviceEnvs == nil {
deviceEnvs = make(map[string]string, len(b.hookEnvs[h]))
}
deviceEnvs[k] = e
}
}
}
// Copy template env vars as they override task env vars
for k, v := range b.templateEnv {
envMap[k] = v
}
// Clean keys (see #2405)
cleanedEnv := make(map[string]string, len(envMap))
for k, v := range envMap {
cleanedK := helper.CleanEnvVar(k, '_')
cleanedEnv[cleanedK] = v
}
var cleanedDeviceEnvs map[string]string
if deviceEnvs != nil {
cleanedDeviceEnvs = make(map[string]string, len(deviceEnvs))
for k, v := range deviceEnvs {
cleanedK := helper.CleanEnvVar(k, '_')
cleanedDeviceEnvs[cleanedK] = v
}
}
return NewTaskEnv(cleanedEnv, cleanedDeviceEnvs, nodeAttrs)
}
// Update task updates the environment based on a new alloc and task.
func (b *Builder) UpdateTask(alloc *structs.Allocation, task *structs.Task) *Builder {
b.mu.Lock()
defer b.mu.Unlock()
return b.setTask(task).setAlloc(alloc)
}
// SetHookEnv sets environment variables from a hook. Variables are
// Last-Write-Wins, so if a hook writes a variable that's also written by a
// later hook, the later hooks value always gets used.
func (b *Builder) SetHookEnv(hook string, envs map[string]string) *Builder {
b.mu.Lock()
defer b.mu.Unlock()
return b.setHookEnvLocked(hook, envs)
}
// setHookEnvLocked is the implementation of setting hook environment variables
// and should be called with the lock held
func (b *Builder) setHookEnvLocked(hook string, envs map[string]string) *Builder {
if _, exists := b.hookEnvs[hook]; !exists {
b.hookNames = append(b.hookNames, hook)
}
b.hookEnvs[hook] = envs
return b
}
// SetDeviceHookEnv sets environment variables from a device hook. Variables are
// Last-Write-Wins, so if a hook writes a variable that's also written by a
// later hook, the later hooks value always gets used.
func (b *Builder) SetDeviceHookEnv(hookName string, envs map[string]string) *Builder {
b.mu.Lock()
defer b.mu.Unlock()
// Store the device hook name
b.deviceHookName = hookName
return b.setHookEnvLocked(hookName, envs)
}
// setTask is called from NewBuilder to populate task related environment
// variables.
func (b *Builder) setTask(task *structs.Task) *Builder {
b.taskName = task.Name
b.envvars = make(map[string]string, len(task.Env))
for k, v := range task.Env {
b.envvars[k] = v
}
// COMPAT(0.11): Remove in 0.11
if task.Resources == nil {
b.memLimit = 0
b.cpuLimit = 0
b.networks = []*structs.NetworkResource{}
} else {
b.memLimit = int64(task.Resources.MemoryMB)
b.cpuLimit = int64(task.Resources.CPU)
// Copy networks to prevent sharing
b.networks = make([]*structs.NetworkResource, len(task.Resources.Networks))
for i, n := range task.Resources.Networks {
b.networks[i] = n.Copy()
}
}
return b
}
// setAlloc is called from NewBuilder to populate alloc related environment
// variables.
func (b *Builder) setAlloc(alloc *structs.Allocation) *Builder {
b.allocId = alloc.ID
b.allocName = alloc.Name
b.groupName = alloc.TaskGroup
b.allocIndex = int(alloc.Index())
b.jobName = alloc.Job.Name
// Set meta
combined := alloc.Job.CombinedTaskMeta(alloc.TaskGroup, b.taskName)
// taskMetaSize is double to total meta keys to account for given and upper
// cased values
taskMetaSize := len(combined) * 2
// if job is parameterized initialize optional meta to empty strings
if alloc.Job.Dispatched {
optionalMetaCount := len(alloc.Job.ParameterizedJob.MetaOptional)
b.taskMeta = make(map[string]string, taskMetaSize+optionalMetaCount*2)
for _, k := range alloc.Job.ParameterizedJob.MetaOptional {
b.taskMeta[fmt.Sprintf("%s%s", MetaPrefix, strings.ToUpper(k))] = ""
b.taskMeta[fmt.Sprintf("%s%s", MetaPrefix, k)] = ""
}
} else {
b.taskMeta = make(map[string]string, taskMetaSize)
}
for k, v := range combined {
b.taskMeta[fmt.Sprintf("%s%s", MetaPrefix, strings.ToUpper(k))] = v
b.taskMeta[fmt.Sprintf("%s%s", MetaPrefix, k)] = v
}
// COMPAT(0.11): Remove in 0.11
b.otherPorts = make(map[string]string, len(alloc.Job.LookupTaskGroup(alloc.TaskGroup).Tasks)*2)
if alloc.AllocatedResources != nil {
// Populate task resources
if tr, ok := alloc.AllocatedResources.Tasks[b.taskName]; ok {
b.cpuLimit = tr.Cpu.CpuShares
b.memLimit = tr.Memory.MemoryMB
// Copy networks to prevent sharing
b.networks = make([]*structs.NetworkResource, len(tr.Networks))
for i, n := range tr.Networks {
b.networks[i] = n.Copy()
}
}
// Add ports from other tasks
for taskName, resources := range alloc.AllocatedResources.Tasks {
// Add ports from other tasks
if taskName == b.taskName {
continue
}
for _, nw := range resources.Networks {
for _, p := range nw.ReservedPorts {
addPort(b.otherPorts, taskName, nw.IP, p.Label, p.Value)
}
for _, p := range nw.DynamicPorts {
addPort(b.otherPorts, taskName, nw.IP, p.Label, p.Value)
}
}
}
} else if alloc.TaskResources != nil {
for taskName, resources := range alloc.TaskResources {
// Add ports from other tasks
if taskName == b.taskName {
continue
}
for _, nw := range resources.Networks {
for _, p := range nw.ReservedPorts {
addPort(b.otherPorts, taskName, nw.IP, p.Label, p.Value)
}
for _, p := range nw.DynamicPorts {
addPort(b.otherPorts, taskName, nw.IP, p.Label, p.Value)
}
}
}
}
return b
}
// setNode is called from NewBuilder to populate node attributes.
func (b *Builder) setNode(n *structs.Node) *Builder {
b.nodeAttrs = make(map[string]string, 4+len(n.Attributes)+len(n.Meta))
b.nodeAttrs[nodeIdKey] = n.ID
b.nodeAttrs[nodeNameKey] = n.Name
b.nodeAttrs[nodeClassKey] = n.NodeClass
b.nodeAttrs[nodeDcKey] = n.Datacenter
b.datacenter = n.Datacenter
// Set up the attributes.
for k, v := range n.Attributes {
b.nodeAttrs[fmt.Sprintf("%s%s", nodeAttributePrefix, k)] = v
}
// Set up the meta.
for k, v := range n.Meta {
b.nodeAttrs[fmt.Sprintf("%s%s", nodeMetaPrefix, k)] = v
}
return b
}
func (b *Builder) SetAllocDir(dir string) *Builder {
b.mu.Lock()
b.allocDir = dir
b.mu.Unlock()
return b
}
func (b *Builder) SetTaskLocalDir(dir string) *Builder {
b.mu.Lock()
b.localDir = dir
b.mu.Unlock()
return b
}
func (b *Builder) SetSecretsDir(dir string) *Builder {
b.mu.Lock()
b.secretsDir = dir
b.mu.Unlock()
return b
}
// SetDriverNetwork defined by the driver.
func (b *Builder) SetDriverNetwork(n *drivers.DriverNetwork) *Builder {
ncopy := n.Copy()
b.mu.Lock()
b.driverNetwork = ncopy
b.mu.Unlock()
return b
}
// buildNetworkEnv env vars in the given map.
//
// Auto: NOMAD_PORT_<label>
// Host: NOMAD_IP_<label>, NOMAD_ADDR_<label>, NOMAD_HOST_PORT_<label>
//
// Handled by setAlloc -> otherPorts:
//
// Task: NOMAD_TASK_{IP,PORT,ADDR}_<task>_<label> # Always host values
//
func buildNetworkEnv(envMap map[string]string, nets structs.Networks, driverNet *drivers.DriverNetwork) {
for _, n := range nets {
for _, p := range n.ReservedPorts {
buildPortEnv(envMap, p, n.IP, driverNet)
}
for _, p := range n.DynamicPorts {
buildPortEnv(envMap, p, n.IP, driverNet)
}
}
}
func buildPortEnv(envMap map[string]string, p structs.Port, ip string, driverNet *drivers.DriverNetwork) {
// Host IP, port, and address
portStr := strconv.Itoa(p.Value)
envMap[IpPrefix+p.Label] = ip
envMap[HostPortPrefix+p.Label] = portStr
envMap[AddrPrefix+p.Label] = net.JoinHostPort(ip, portStr)
// Set Port to task's value if there's a port map
if driverNet != nil && driverNet.PortMap[p.Label] != 0 {
envMap[PortPrefix+p.Label] = strconv.Itoa(driverNet.PortMap[p.Label])
} else {
// Default to host's
envMap[PortPrefix+p.Label] = portStr
}
}
// SetHostEnvvars adds the host environment variables to the tasks. The filter
// parameter can be use to filter host environment from entering the tasks.
func (b *Builder) SetHostEnvvars(filter []string) *Builder {
filterMap := make(map[string]struct{}, len(filter))
for _, f := range filter {
filterMap[f] = struct{}{}
}
fullHostEnv := os.Environ()
filteredHostEnv := make(map[string]string, len(fullHostEnv))
for _, e := range fullHostEnv {
parts := strings.SplitN(e, "=", 2)
key, value := parts[0], parts[1]
// Skip filtered environment variables
if _, filtered := filterMap[key]; filtered {
continue
}
filteredHostEnv[key] = value
}
b.mu.Lock()
b.hostEnv = filteredHostEnv
b.mu.Unlock()
return b
}
func (b *Builder) SetTemplateEnv(m map[string]string) *Builder {
b.mu.Lock()
b.templateEnv = m
b.mu.Unlock()
return b
}
func (b *Builder) SetVaultToken(token, namespace string, inject bool) *Builder {
b.mu.Lock()
b.vaultToken = token
b.vaultNamespace = namespace
b.injectVaultToken = inject
b.mu.Unlock()
return b
}
// addPort keys and values for other tasks to an env var map
func addPort(m map[string]string, taskName, ip, portLabel string, port int) {
key := fmt.Sprintf("%s%s_%s", AddrPrefix, taskName, portLabel)
m[key] = fmt.Sprintf("%s:%d", ip, port)
key = fmt.Sprintf("%s%s_%s", IpPrefix, taskName, portLabel)
m[key] = ip
key = fmt.Sprintf("%s%s_%s", PortPrefix, taskName, portLabel)
m[key] = strconv.Itoa(port)
}