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feat(update): add more configuration options for update.conf

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This commit is contained in:
Jonathan Boulle 2014-05-14 12:22:10 -07:00
parent 41cbec8729
commit e413a97741
2 changed files with 226 additions and 58 deletions
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108
initialize/update.go
View File

@ -2,6 +2,8 @@ package initialize
import (
"bufio"
"errors"
"fmt"
"os"
"path"
"strings"
@ -9,27 +11,78 @@ import (
"github.com/coreos/coreos-cloudinit/system"
)
const locksmithUnit = "locksmithd.service"
const (
locksmithUnit = "locksmithd.service"
)
// updateOption represents a configurable update option, which, if set, will be
// written into update.conf, replacing any existing value for the option
type updateOption struct {
key string // key used to configure this option in cloud-config
valid []string // valid values for the option
prefix string // prefix for the option in the update.conf file
value string // used to store the new value in update.conf (including prefix)
seen bool // whether the option has been seen in any existing update.conf
}
// updateOptions defines the update options understood by cloud-config.
// The keys represent the string used in cloud-config to configure the option.
var updateOptions = []*updateOption{
&updateOption{
key: "reboot-strategy",
prefix: "REBOOT_STRATEGY=",
valid: []string{"best-effort", "etcd-lock", "reboot", "off"},
},
&updateOption{
key: "group",
prefix: "GROUP=",
valid: []string{"master", "beta", "alpha", "stable"},
},
&updateOption{
key: "server",
prefix: "SERVER=",
},
}
// isValid checks whether a supplied value is valid for this option
func (uo updateOption) isValid(val string) bool {
if len(uo.valid) == 0 {
return true
}
for _, v := range uo.valid {
if val == v {
return true
}
}
return false
}
type UpdateConfig map[string]string
func (uc UpdateConfig) strategy() string {
s, _ := uc["reboot-strategy"]
return s
}
// File creates an `/etc/coreos/update.conf` file with the requested
// strategy, by either rewriting the existing file on disk, or starting
// from `/usr/share/coreos/update.conf`
// File generates an `/etc/coreos/update.conf` file (if any update
// configuration options are set in cloud-config) by either rewriting the
// existing file on disk, or starting from `/usr/share/coreos/update.conf`
func (uc UpdateConfig) File(root string) (*system.File, error) {
// If no reboot-strategy is set, we don't need to generate a new config
if _, ok := uc["reboot-strategy"]; !ok {
if len(uc) < 1 {
return nil, nil
}
var out string
// Generate the list of possible substitutions to be performed based on the options that are configured
subs := make([]*updateOption, 0)
for _, uo := range updateOptions {
val, ok := uc[uo.key]
if !ok {
continue
}
if !uo.isValid(val) {
return nil, errors.New(fmt.Sprintf("invalid value %v for option %v (valid options: %v)", val, uo.key, uo.valid))
}
uo.value = uo.prefix + val
subs = append(subs, uo)
}
etcUpdate := path.Join(root, "etc", "coreos", "update.conf")
usrUpdate := path.Join(root, "usr", "share", "coreos", "update.conf")
@ -43,13 +96,14 @@ func (uc UpdateConfig) File(root string) (*system.File, error) {
scanner := bufio.NewScanner(conf)
sawStrat := false
stratLine := "REBOOT_STRATEGY=" + uc.strategy()
for scanner.Scan() {
line := scanner.Text()
if strings.HasPrefix(line, "REBOOT_STRATEGY=") {
line = stratLine
sawStrat = true
for _, s := range subs {
if strings.HasPrefix(line, s.prefix) {
line = s.value
s.seen = true
break
}
}
out += line
out += "\n"
@ -58,10 +112,13 @@ func (uc UpdateConfig) File(root string) (*system.File, error) {
}
}
if !sawStrat {
out += stratLine
out += "\n"
for _, s := range subs {
if !s.seen {
out += s.value
out += "\n"
}
}
return &system.File{
Path: path.Join("etc", "coreos", "update.conf"),
RawFilePermissions: "0644",
@ -69,9 +126,14 @@ func (uc UpdateConfig) File(root string) (*system.File, error) {
}, nil
}
// Unit generates a locksmith system.Unit for the cloud-init initializer to
// act on appropriately
// GetUnit generates a locksmith system.Unit, if reboot-strategy was set in
// cloud-config, for the cloud-init initializer to act on appropriately
func (uc UpdateConfig) Unit(root string) (*system.Unit, error) {
strategy, ok := uc["reboot-strategy"]
if !ok {
return nil, nil
}
u := &system.Unit{
Name: locksmithUnit,
Enable: true,
@ -79,7 +141,7 @@ func (uc UpdateConfig) Unit(root string) (*system.Unit, error) {
Mask: false,
}
if uc.strategy() == "off" {
if strategy == "off" {
u.Enable = false
u.Command = "stop"
u.Mask = true

176
initialize/update_test.go
View File

@ -4,6 +4,8 @@ import (
"io/ioutil"
"os"
"path"
"sort"
"strings"
"testing"
"github.com/coreos/coreos-cloudinit/system"
@ -12,11 +14,9 @@ import (
const (
base = `SERVER=https://example.com
GROUP=thegroupc`
configured = base + `
REBOOT_STRATEGY=awesome
`
expected = base + `
REBOOT_STRATEGY=etcd-lock
`
@ -29,7 +29,143 @@ func setupFixtures(dir string) {
ioutil.WriteFile(path.Join(dir, "usr", "share", "coreos", "update.conf"), []byte(base), 0644)
}
func TestLocksmithEnvironmentWrittenToDisk(t *testing.T) {
func TestEmptyUpdateConfig(t *testing.T) {
uc := &UpdateConfig{}
f, err := uc.File("")
if err != nil {
t.Error("unexpected error getting file from empty UpdateConfig")
}
if f != nil {
t.Errorf("getting file from empty UpdateConfig should have returned nil, got %v", f)
}
u, err := uc.Unit("")
if err != nil {
t.Error("unexpected error getting unit from empty UpdateConfig")
}
if u != nil {
t.Errorf("getting unit from empty UpdateConfig should have returned nil, got %v", u)
}
}
func TestInvalidUpdateOptions(t *testing.T) {
uon := &updateOption{
key: "numbers",
prefix: "numero_",
valid: []string{"one", "two"},
}
uoa := &updateOption{
key: "any_will_do",
prefix: "any_",
}
if !uon.isValid("one") {
t.Error("update option did not accept valid option \"one\"")
}
if uon.isValid("three") {
t.Error("update option accepted invalid option \"three\"")
}
for _, s := range []string{"one", "asdf", "foobarbaz"} {
if !uoa.isValid(s) {
t.Errorf("update option with no \"valid\" field did not accept %q", s)
}
}
uc := &UpdateConfig{"reboot-strategy": "wizzlewazzle"}
f, err := uc.File("")
if err == nil {
t.Errorf("File did not give an error on invalid UpdateOption")
}
if f != nil {
t.Errorf("File did not return a nil file on invalid UpdateOption")
}
}
func TestServerGroupOptions(t *testing.T) {
dir, err := ioutil.TempDir(os.TempDir(), "coreos-cloudinit-")
if err != nil {
t.Fatalf("unable to create tempdir: %v", err)
}
defer os.RemoveAll(dir)
setupFixtures(dir)
u := &UpdateConfig{"group": "master", "server": "http://foo.com"}
want := `
GROUP=master
SERVER=http://foo.com`
f, err := u.File(dir)
if err != nil {
t.Errorf("unexpected error getting file from UpdateConfig: %v", err)
} else if f == nil {
t.Error("unexpectedly got empty file from UpdateConfig")
} else {
out := strings.Split(f.Content, "\n")
sort.Strings(out)
got := strings.Join(out, "\n")
if got != want {
t.Errorf("File has incorrect contents, got %v, want %v", got, want)
}
}
}
func TestRebootStrategies(t *testing.T) {
dir, err := ioutil.TempDir(os.TempDir(), "coreos-cloudinit-")
if err != nil {
t.Fatalf("Unable to create tempdir: %v", err)
}
defer os.RemoveAll(dir)
setupFixtures(dir)
strategies := []struct {
name string
line string
uMask bool
uCommand string
}{
{"best-effort", "REBOOT_STRATEGY=best-effort", false, "restart"},
{"etcd-lock", "REBOOT_STRATEGY=etcd-lock", false, "restart"},
{"reboot", "REBOOT_STRATEGY=reboot", false, "restart"},
{"off", "REBOOT_STRATEGY=off", true, "stop"},
}
for _, s := range strategies {
uc := &UpdateConfig{"reboot-strategy": s.name}
f, err := uc.File(dir)
if err != nil {
t.Errorf("update failed to generate file for reboot-strategy=%v: %v", s.name, err)
} else if f == nil {
t.Errorf("generated empty file for reboot-strategy=%v", s.name)
} else {
seen := false
for _, line := range strings.Split(f.Content, "\n") {
if line == s.line {
seen = true
break
}
}
if !seen {
t.Errorf("couldn't find expected line %v for reboot-strategy=%v", s.line)
}
}
u, err := uc.Unit(dir)
if err != nil {
t.Errorf("failed to generate unit for reboot-strategy=%v!", s.name)
} else if u == nil {
t.Errorf("generated empty unit for reboot-strategy=%v", s.name)
} else {
if u.Name != locksmithUnit {
t.Errorf("unit generated for reboot strategy=%v had bad name: %v", s.name, u.Name)
}
if u.Mask != s.uMask {
t.Errorf("unit generated for reboot strategy=%v had bad mask: %t", s.name, u.Mask)
}
if u.Command != s.uCommand {
t.Errorf("unit generated for reboot strategy=%v had bad command: %v", s.name, u.Command)
}
}
}
}
func TestUpdateConfWrittenToDisk(t *testing.T) {
dir, err := ioutil.TempDir(os.TempDir(), "coreos-cloudinit-")
if err != nil {
t.Fatalf("Unable to create tempdir: %v", err)
@ -49,9 +185,8 @@ func TestLocksmithEnvironmentWrittenToDisk(t *testing.T) {
f, err := uc.File(dir)
if err != nil {
t.Fatalf("Processing UpdateConfig failed: %v", err)
}
if f == nil {
t.Fatalf("UpdateConfig generated nil file unexpectedly")
} else if f == nil {
t.Fatal("Unexpectedly got nil updateconfig file")
}
f.Path = path.Join(dir, f.Path)
@ -80,32 +215,3 @@ func TestLocksmithEnvironmentWrittenToDisk(t *testing.T) {
}
}
}
func TestLocksmithEnvironmentMasked(t *testing.T) {
dir, err := ioutil.TempDir(os.TempDir(), "coreos-cloudinit-")
if err != nil {
t.Fatalf("Unable to create tempdir: %v", err)
}
defer os.RemoveAll(dir)
setupFixtures(dir)
uc := &UpdateConfig{"reboot-strategy": "off"}
u, err := uc.Unit(dir)
if err != nil {
t.Fatalf("Processing UpdateConfig failed: %v", err)
}
if u == nil {
t.Fatalf("UpdateConfig generated nil unit unexpectedly")
}
system.MaskUnit(u.Name, dir)
fullPath := path.Join(dir, "etc", "systemd", "system", "locksmithd.service")
target, err := os.Readlink(fullPath)
if err != nil {
t.Fatalf("Unable to read link %v", err)
}
if target != "/dev/null" {
t.Fatalf("Locksmith not masked, unit target %v", target)
}
}