func (s *baseLoginSuite) openAPIWithoutLogin(c *gc.C, info *api.Info) api.Connection {
info.Tag = nil
info.Password = ""
st, err := api.Open(info, fastDialOpts)
c.Assert(err, jc.ErrorIsNil)
return st
}
// connectFallback opens an API connection using the supplied info,
// or a copy using the fallbackPassword; blocks for up to 5 minutes
// if it encounters a CodeNotProvisioned error, periodically retrying;
// and eventually, having either succeeded, failed, or timed out, returns:
//
// * (if successful) the connection, and whether the fallback was used
// * (otherwise) whatever error it most recently encountered
//
// It's clear that it still has machine-agent concerns still baked in,
// but there's no obvious practical path to separating those entirely at
// the moment.
//
// (The right answer is probably to treat CodeNotProvisioned as a normal
// error and depend on (currently nonexistent) exponential backoff in
// the framework: either it'll work soon enough, or the controller will
// spot the error and nuke the machine anyway. No harm leaving the local
// agent running and occasionally polling for changes -- it won't do much
// until it's managed to log in, and any suicide-cutoff point we pick here
// will be objectively bad in some circumstances.)
func connectFallback(
apiOpen api.OpenFunc, info *api.Info, fallbackPassword string,
) (
conn api.Connection, didFallback bool, err error,
) {
// We expect to assign to `conn`, `err`, *and* `info` in
// the course of this operation: wrapping this repeated
// atom in a func currently seems to be less treacherous
// than the alternatives.
var tryConnect = func() {
conn, err = apiOpen(info, api.DialOpts{})
}
// Try to connect, trying both the primary and fallback
// passwords if necessary; and update info, and remember
// which password we used.
tryConnect()
if params.IsCodeUnauthorized(err) {
// We've perhaps used the wrong password, so
// try again with the fallback password.
infoCopy := *info
info = &infoCopy
info.Password = fallbackPassword
didFallback = true
tryConnect()
}
// We might be a machine agent that's started before its
// provisioner has had a chance to report instance data
// to the machine; wait a fair while to ensure we really
// are in the (expected rare) provisioner-crash situation
// that would cause permanent CodeNotProvisioned (which
// indicates that the controller has forgotten about us,
// and is provisioning a new instance, so we really should
// uninstall).
//
// Yes, it's dumb that this can't be interrupted, and that
// it's not configurable without patching.
if params.IsCodeNotProvisioned(err) {
for a := checkProvisionedStrategy.Start(); a.Next(); {
tryConnect()
if !params.IsCodeNotProvisioned(err) {
break
}
}
}
// At this point we've run out of reasons to retry connecting,
// and just go with whatever error we last saw (if any).
if err != nil {
return nil, false, errors.Trace(err)
}
return conn, didFallback, nil
}
func openAPIStateUsingInfo(info *api.Info, oldPassword string) (api.Connection, bool, error) {
// We let the API dial fail immediately because the
// runner's loop outside the caller of openAPIState will
// keep on retrying. If we block for ages here,
// then the worker that's calling this cannot
// be interrupted.
st, err := apiOpen(info, api.DialOpts{})
usedOldPassword := false
if params.IsCodeUnauthorized(err) {
// We've perhaps used the wrong password, so
// try again with the fallback password.
infoCopy := *info
info = &infoCopy
info.Password = oldPassword
usedOldPassword = true
st, err = apiOpen(info, api.DialOpts{})
}
// The provisioner may take some time to record the agent's
// machine instance ID, so wait until it does so.
if params.IsCodeNotProvisioned(err) {
for a := checkProvisionedStrategy.Start(); a.Next(); {
st, err = apiOpen(info, api.DialOpts{})
if !params.IsCodeNotProvisioned(err) {
break
}
}
}
if err != nil {
if params.IsCodeNotProvisioned(err) || params.IsCodeUnauthorized(err) {
logger.Errorf("agent terminating due to error returned during API open: %v", err)
return nil, false, worker.ErrTerminateAgent
}
return nil, false, err
}
return st, usedOldPassword, nil
}
func commonConnect(
apiOpen api.OpenFunc,
apiInfo *api.Info,
accountDetails *jujuclient.AccountDetails,
modelUUID string,
dialOpts api.DialOpts,
) (api.Connection, error) {
if accountDetails != nil {
// We only set the tag if either a password or
// macaroon is found in the accounts.yaml file.
// If neither is found, we'll use external
// macaroon authentication which requires that
// no tag be specified.
userTag := names.NewUserTag(accountDetails.User)
if accountDetails.Password != "" {
// If a password is available, we always use
// that.
//
// TODO(axw) make it invalid to store both
// password and macaroon in accounts.yaml?
apiInfo.Tag = userTag
apiInfo.Password = accountDetails.Password
} else if accountDetails.Macaroon != "" {
var m macaroon.Macaroon
if err := json.Unmarshal([]byte(accountDetails.Macaroon), &m); err != nil {
return nil, errors.Trace(err)
}
apiInfo.Tag = userTag
apiInfo.Macaroons = []macaroon.Slice{{&m}}
}
}
if modelUUID != "" {
apiInfo.ModelTag = names.NewModelTag(modelUUID)
}
st, err := apiOpen(apiInfo, dialOpts)
return st, errors.Trace(err)
}
// Run implements Command.Run
func (c *loginCommand) Run(ctx *cmd.Context) error {
if c.loginAPIOpen == nil {
c.loginAPIOpen = c.JujuCommandBase.APIOpen
}
// TODO(thumper): as we support the user and address
// change this check here.
if c.Server.Path == "" {
return errors.New("no server file specified")
}
serverYAML, err := c.Server.Read(ctx)
if err != nil {
return errors.Trace(err)
}
var serverDetails envcmd.ServerFile
if err := goyaml.Unmarshal(serverYAML, &serverDetails); err != nil {
return errors.Trace(err)
}
info := api.Info{
Addrs: serverDetails.Addresses,
CACert: serverDetails.CACert,
}
var userTag names.UserTag
if serverDetails.Username != "" {
// Construct the api.Info struct from the provided values
// and attempt to connect to the remote server before we do anything else.
if !names.IsValidUser(serverDetails.Username) {
return errors.Errorf("%q is not a valid username", serverDetails.Username)
}
userTag = names.NewUserTag(serverDetails.Username)
if !userTag.IsLocal() {
// Remote users do not have their passwords stored in Juju
// so we never attempt to change them.
c.KeepPassword = true
}
info.Tag = userTag
}
if serverDetails.Password != "" {
info.Password = serverDetails.Password
}
if serverDetails.Password == "" || serverDetails.Username == "" {
info.UseMacaroons = true
}
if c == nil {
panic("nil c")
}
if c.loginAPIOpen == nil {
panic("no loginAPIOpen")
}
apiState, err := c.loginAPIOpen(&info, api.DefaultDialOpts())
if err != nil {
return errors.Trace(err)
}
defer apiState.Close()
// If we get to here, the credentials supplied were sufficient to connect
// to the Juju Controller and login. Now we cache the details.
controllerInfo, err := c.cacheConnectionInfo(serverDetails, apiState)
if err != nil {
return errors.Trace(err)
}
ctx.Infof("cached connection details as controller %q", c.Name)
// If we get to here, we have been able to connect to the API server, and
// also have been able to write the cached information. Now we can change
// the user's password to a new randomly generated strong password, and
// update the cached information knowing that the likelihood of failure is
// minimal.
if !c.KeepPassword {
if err := c.updatePassword(ctx, apiState, userTag, controllerInfo); err != nil {
return errors.Trace(err)
}
}
return errors.Trace(envcmd.SetCurrentController(ctx, c.Name))
}