forked from juju/juju
/
agentconfig.go
148 lines (135 loc) · 4.42 KB
/
agentconfig.go
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// Copyright 2014 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package upgrades
import (
"fmt"
"os"
"os/user"
"path/filepath"
"strconv"
"github.com/juju/juju/agent"
"github.com/juju/juju/environs/config"
"github.com/juju/juju/state/api/params"
)
var (
rootLogDir = "/var/log"
rootSpoolDir = "/var/spool/rsyslog"
)
var chownPath = func(path, username string) error {
user, err := user.Lookup(username)
if err != nil {
return fmt.Errorf("cannot lookup %q user id: %v", username, err)
}
uid, err := strconv.Atoi(user.Uid)
if err != nil {
return fmt.Errorf("invalid user id %q: %v", user.Uid, err)
}
gid, err := strconv.Atoi(user.Gid)
if err != nil {
return fmt.Errorf("invalid group id %q: %v", user.Gid, err)
}
return os.Chown(path, uid, gid)
}
var isLocalEnviron = func(envConfig *config.Config) bool {
return envConfig.Type() == "local"
}
func migrateLocalProviderAgentConfig(context Context) error {
st := context.State()
if st == nil {
logger.Debugf("no state connection, no migration required")
// We're running on a different node than the state server.
return nil
}
envConfig, err := st.EnvironConfig()
if err != nil {
return fmt.Errorf("failed to read current config: %v", err)
}
if !isLocalEnviron(envConfig) {
logger.Debugf("not a local environment, no migration required")
return nil
}
attrs := envConfig.AllAttrs()
rootDir, _ := attrs["root-dir"].(string)
sharedStorageDir := filepath.Join(rootDir, "shared-storage")
// In case these two are empty we need to set them and update the
// environment config.
namespace, _ := attrs["namespace"].(string)
container, _ := attrs["container"].(string)
if namespace == "" {
username := os.Getenv("USER")
if username == "root" {
// sudo was probably called, get the original user.
username = os.Getenv("SUDO_USER")
}
if username == "" {
return fmt.Errorf("cannot get current user from the environment: %v", os.Environ())
}
namespace = username + "-" + envConfig.Name()
}
if container == "" {
container = "lxc"
}
dataDir := rootDir
localLogDir := filepath.Join(rootDir, "log")
// rsyslogd is restricted to write to /var/log
logDir := fmt.Sprintf("%s/juju-%s", rootLogDir, namespace)
jobs := []params.MachineJob{params.JobManageEnviron}
values := map[string]string{
agent.Namespace: namespace,
// ContainerType is empty on the bootstrap node.
agent.ContainerType: "",
agent.AgentServiceName: "juju-agent-" + namespace,
}
deprecatedValues := []string{
"SHARED_STORAGE_ADDR",
"SHARED_STORAGE_DIR",
}
// Remove shared-storage dir if there.
if err := os.RemoveAll(sharedStorageDir); err != nil {
return fmt.Errorf("cannot remove deprecated %q: %v", sharedStorageDir, err)
}
// We need to create the dirs if they don't exist.
if err := os.MkdirAll(dataDir, 0755); err != nil {
return fmt.Errorf("cannot create dataDir %q: %v", dataDir, err)
}
// We always recreate the logDir to make sure it's empty.
if err := os.RemoveAll(logDir); err != nil {
return fmt.Errorf("cannot remove logDir %q: %v", logDir, err)
}
if err := os.MkdirAll(logDir, 0755); err != nil {
return fmt.Errorf("cannot create logDir %q: %v", logDir, err)
}
// Reconfigure rsyslog as needed:
// 1. logDir must be owned by syslog:adm
// 2. Remove old rsyslog spool config
// 3. Relink logs to the new logDir
if err := chownPath(logDir, "syslog"); err != nil {
return err
}
spoolConfig := fmt.Sprintf("%s/machine-0-%s", rootSpoolDir, namespace)
if err := os.RemoveAll(spoolConfig); err != nil {
return fmt.Errorf("cannot remove %q: %v", spoolConfig, err)
}
allMachinesLog := filepath.Join(logDir, "all-machines.log")
if err := os.Symlink(allMachinesLog, localLogDir+"/"); err != nil && !os.IsExist(err) {
return fmt.Errorf("cannot symlink %q to %q: %v", allMachinesLog, localLogDir, err)
}
machine0Log := filepath.Join(localLogDir, "machine-0.log")
if err := os.Symlink(machine0Log, logDir+"/"); err != nil && !os.IsExist(err) {
return fmt.Errorf("cannot symlink %q to %q: %v", machine0Log, logDir, err)
}
newCfg := map[string]interface{}{
"namespace": namespace,
"container": container,
}
if err := st.UpdateEnvironConfig(newCfg, nil, nil); err != nil {
return fmt.Errorf("cannot update environment config: %v", err)
}
return context.AgentConfig().Migrate(agent.MigrateParams{
DataDir: dataDir,
LogDir: logDir,
Jobs: jobs,
Values: values,
DeleteValues: deprecatedValues,
})
}