func init() {
if !env.OnGCE() {
return
}
osutil.RegisterConfigDirFunc(func() string {
v, _ := metadata.InstanceAttributeValue("camlistore-config-dir")
if v == "" {
return v
}
return path.Clean("/gcs/" + strings.TrimPrefix(v, "gs://"))
})
jsonconfig.RegisterFunc("_gce_instance_meta", func(c *jsonconfig.ConfigParser, v []interface{}) (interface{}, error) {
if len(v) != 1 {
return nil, errors.New("only 1 argument supported after _gce_instance_meta")
}
attr, ok := v[0].(string)
if !ok {
return nil, errors.New("expected argument after _gce_instance_meta to be a string")
}
val, err := metadata.InstanceAttributeValue(attr)
if err != nil {
return nil, fmt.Errorf("error reading GCE instance attribute %q: %v", attr, err)
}
return val, nil
})
}
func detectGCE() {
if !metadata.OnGCE() {
return
}
v, _ := metadata.InstanceAttributeValue("camlistore-config-dir")
isGCE = v != ""
}
// DefaultEnvConfig returns the default configuration when running on a known
// environment. Currently this just includes Google Compute Engine.
// If the environment isn't known (nil, nil) is returned.
func DefaultEnvConfig() (*Config, error) {
if !env.OnGCE() {
return nil, nil
}
auth := "none"
user, _ := metadata.InstanceAttributeValue("camlistore-username")
pass, _ := metadata.InstanceAttributeValue("camlistore-password")
confBucket, err := metadata.InstanceAttributeValue("camlistore-config-dir")
if confBucket == "" || err != nil {
return nil, fmt.Errorf("VM instance metadata key 'camlistore-config-dir' not set: %v", err)
}
blobBucket, err := metadata.InstanceAttributeValue("camlistore-blob-dir")
if blobBucket == "" || err != nil {
return nil, fmt.Errorf("VM instance metadata key 'camlistore-blob-dir' not set: %v", err)
}
if user != "" && pass != "" {
auth = "userpass:"******":" + pass
}
if v := osutil.SecretRingFile(); !strings.HasPrefix(v, "/gcs/") {
return nil, fmt.Errorf("Internal error: secret ring path on GCE should be at /gcs/, not %q", v)
}
keyId, secRing, err := getOrMakeKeyring()
if err != nil {
return nil, err
}
ipOrHost, _ := metadata.ExternalIP()
host, _ := metadata.InstanceAttributeValue("camlistore-hostname")
if host != "" && host != "localhost" {
ipOrHost = host
}
highConf := &serverconfig.Config{
Auth: auth,
BaseURL: fmt.Sprintf("https://%s", ipOrHost),
HTTPS: true,
Listen: "0.0.0.0:443",
Identity: keyId,
IdentitySecretRing: secRing,
GoogleCloudStorage: ":" + strings.TrimPrefix(blobBucket, "gs://"),
DBNames: map[string]string{},
PackRelated: true,
// SourceRoot is where we look for the UI js/css/html files, and the Closure resources.
// Must be in sync with misc/docker/server/Dockerfile.
SourceRoot: "/camlistore",
}
// Detect a linked Docker MySQL container. It must have alias "mysqldb".
if v := os.Getenv("MYSQLDB_PORT"); strings.HasPrefix(v, "tcp://") {
hostPort := strings.TrimPrefix(v, "tcp://")
highConf.MySQL = "root@" + hostPort + ":" // no password
highConf.DBNames["queue-sync-to-index"] = "sync_index_queue"
highConf.DBNames["ui_thumbcache"] = "ui_thumbmeta_cache"
highConf.DBNames["blobpacked_index"] = "blobpacked_index"
} else {
// TODO: also detect Cloud SQL.
highConf.KVFile = "/index.kv"
}
return genLowLevelConfig(highConf)
}