124 lines
3.4 KiB
Go
124 lines
3.4 KiB
Go
/*
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Copyright 2014 CoreOS, Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package initialize
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import (
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"os"
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"path"
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"regexp"
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"strings"
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"github.com/coreos/coreos-cloudinit/config"
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"github.com/coreos/coreos-cloudinit/system"
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)
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const DefaultSSHKeyName = "coreos-cloudinit"
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type Environment struct {
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root string
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configRoot string
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workspace string
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netconfType string
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sshKeyName string
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substitutions map[string]string
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}
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// TODO(jonboulle): this is getting unwieldy, should be able to simplify the interface somehow
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func NewEnvironment(root, configRoot, workspace, netconfType, sshKeyName string, substitutions map[string]string) *Environment {
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if substitutions == nil {
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substitutions = make(map[string]string)
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}
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// If certain values are not in the supplied substitution, fall back to retrieving them from the environment
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for k, v := range map[string]string{
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"$public_ipv4": os.Getenv("COREOS_PUBLIC_IPV4"),
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"$private_ipv4": os.Getenv("COREOS_PRIVATE_IPV4"),
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"$public_ipv6": os.Getenv("COREOS_PUBLIC_IPV6"),
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"$private_ipv6": os.Getenv("COREOS_PRIVATE_IPV6"),
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} {
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if _, ok := substitutions[k]; !ok {
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substitutions[k] = v
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}
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}
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return &Environment{root, configRoot, workspace, netconfType, sshKeyName, substitutions}
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}
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func (e *Environment) Workspace() string {
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return path.Join(e.root, e.workspace)
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}
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func (e *Environment) Root() string {
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return e.root
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}
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func (e *Environment) ConfigRoot() string {
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return e.configRoot
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}
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func (e *Environment) NetconfType() string {
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return e.netconfType
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}
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func (e *Environment) SSHKeyName() string {
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return e.sshKeyName
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}
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func (e *Environment) SetSSHKeyName(name string) {
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e.sshKeyName = name
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}
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// Apply goes through the map of substitutions and replaces all instances of
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// the keys with their respective values. It supports escaping substitutions
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// with a leading '\'.
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func (e *Environment) Apply(data string) string {
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for key, val := range e.substitutions {
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matchKey := strings.Replace(key, `$`, `\$`, -1)
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replKey := strings.Replace(key, `$`, `$$`, -1)
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// "key" -> "val"
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data = regexp.MustCompile(`([^\\]|^)`+matchKey).ReplaceAllString(data, `${1}`+val)
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// "\key" -> "key"
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data = regexp.MustCompile(`\\`+matchKey).ReplaceAllString(data, replKey)
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}
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return data
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}
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func (e *Environment) DefaultEnvironmentFile() *system.EnvFile {
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ef := system.EnvFile{
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File: &system.File{File: config.File{
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Path: "/etc/environment",
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}},
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Vars: map[string]string{},
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}
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if ip, ok := e.substitutions["$public_ipv4"]; ok && len(ip) > 0 {
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ef.Vars["COREOS_PUBLIC_IPV4"] = ip
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}
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if ip, ok := e.substitutions["$private_ipv4"]; ok && len(ip) > 0 {
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ef.Vars["COREOS_PRIVATE_IPV4"] = ip
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}
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if ip, ok := e.substitutions["$public_ipv6"]; ok && len(ip) > 0 {
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ef.Vars["COREOS_PUBLIC_IPV6"] = ip
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}
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if ip, ok := e.substitutions["$private_ipv6"]; ok && len(ip) > 0 {
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ef.Vars["COREOS_PRIVATE_IPV6"] = ip
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}
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if len(ef.Vars) == 0 {
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return nil
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} else {
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return &ef
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}
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}
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