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tools.go
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tools.go
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// Copyright 2012, 2013 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package bootstrap
import (
"fmt"
"github.com/juju/errors"
"github.com/juju/utils/arch"
jujuos "github.com/juju/utils/os"
"github.com/juju/utils/series"
"github.com/juju/utils/set"
"github.com/juju/version"
"github.com/juju/juju/environs"
envtools "github.com/juju/juju/environs/tools"
coretools "github.com/juju/juju/tools"
jujuversion "github.com/juju/juju/version"
)
var (
findTools = envtools.FindTools
)
// validateUploadAllowed returns an error if an attempt to upload tools should
// not be allowed.
func validateUploadAllowed(env environs.Environ, toolsArch, toolsSeries *string) error {
// Now check that the architecture and series for which we are setting up an
// environment matches that from which we are bootstrapping.
hostArch := arch.HostArch()
// We can't build tools for a different architecture if one is specified.
if toolsArch != nil && *toolsArch != hostArch {
return fmt.Errorf("cannot build tools for %q using a machine running on %q", *toolsArch, hostArch)
}
hostOS := jujuos.HostOS()
if toolsSeries != nil {
toolsSeriesOS, err := series.GetOSFromSeries(*toolsSeries)
if err != nil {
return errors.Trace(err)
}
if toolsSeriesOS != hostOS {
return errors.Errorf("cannot build tools for %q using a machine running %q", *toolsSeries, hostOS)
}
}
// If no architecture is specified, ensure the target provider supports instances matching our architecture.
supportedArchitectures, err := env.SupportedArchitectures()
if err != nil {
return fmt.Errorf(
"no packaged tools available and cannot determine model's supported architectures: %v", err)
}
archSupported := false
for _, arch := range supportedArchitectures {
if hostArch == arch {
archSupported = true
break
}
}
if !archSupported {
envType := env.Config().Type()
return errors.Errorf("model %q of type %s does not support instances running on %q", env.Config().Name(), envType, hostArch)
}
return nil
}
// findAvailableTools returns a list of available tools,
// including tools that may be locally built and then
// uploaded. Tools that need to be built will have an
// empty URL.
func findAvailableTools(env environs.Environ, vers *version.Number, arch, series *string, upload bool) (coretools.List, error) {
if upload {
// We're forcing an upload: ensure we can do so.
if err := validateUploadAllowed(env, arch, series); err != nil {
return nil, err
}
return locallyBuildableTools(series), nil
}
// We're not forcing an upload, so look for tools
// in the environment's simplestreams search paths
// for existing tools.
// If the user hasn't asked for a specified tools version, see if
// one is configured in the environment.
if vers == nil {
if agentVersion, ok := env.Config().AgentVersion(); ok {
vers = &agentVersion
}
}
logger.Infof("looking for bootstrap tools: version=%v", vers)
toolsList, findToolsErr := findBootstrapTools(env, vers, arch, series)
if findToolsErr != nil && !errors.IsNotFound(findToolsErr) {
return nil, findToolsErr
}
preferredStream := envtools.PreferredStream(vers, env.Config().Development(), env.Config().AgentStream())
if preferredStream == envtools.ReleasedStream || vers != nil {
// We are not running a development build, or agent-version
// was specified; the only tools available are the ones we've
// just found.
return toolsList, findToolsErr
}
// The tools located may not include the ones that the
// provider requires. We are running a development build,
// so augment the list of tools with those that we can build
// locally.
// Collate the set of arch+series that are externally available
// so we can see if we need to build any locally. If we need
// to, only then do we validate that we can upload (which
// involves a potentially expensive SupportedArchitectures call).
archSeries := make(set.Strings)
for _, tools := range toolsList {
archSeries.Add(tools.Version.Arch + tools.Version.Series)
}
var localToolsList coretools.List
for _, tools := range locallyBuildableTools(series) {
if !archSeries.Contains(tools.Version.Arch + tools.Version.Series) {
localToolsList = append(localToolsList, tools)
}
}
if len(localToolsList) == 0 || validateUploadAllowed(env, arch, series) != nil {
return toolsList, findToolsErr
}
return append(toolsList, localToolsList...), nil
}
// locallyBuildableTools returns the list of tools that
// can be built locally, for series of the same OS.
func locallyBuildableTools(toolsSeries *string) (buildable coretools.List) {
for _, ser := range series.SupportedSeries() {
if os, err := series.GetOSFromSeries(ser); err != nil || os != jujuos.HostOS() {
continue
}
if toolsSeries != nil && ser != *toolsSeries {
continue
}
binary := version.Binary{
Number: jujuversion.Current,
Series: ser,
Arch: arch.HostArch(),
}
// Increment the build number so we know it's a development build.
binary.Build++
buildable = append(buildable, &coretools.Tools{Version: binary})
}
return buildable
}
// findBootstrapTools returns a tools.List containing only those tools with
// which it would be reasonable to launch an environment's first machine,
// given the supplied constraints. If a specific agent version is not requested,
// all tools matching the current major.minor version are chosen.
func findBootstrapTools(env environs.Environ, vers *version.Number, arch, series *string) (list coretools.List, err error) {
// Construct a tools filter.
cliVersion := jujuversion.Current
var filter coretools.Filter
if arch != nil {
filter.Arch = *arch
}
if series != nil {
filter.Series = *series
}
if vers != nil {
filter.Number = *vers
}
stream := envtools.PreferredStream(vers, env.Config().Development(), env.Config().AgentStream())
return findTools(env, cliVersion.Major, cliVersion.Minor, stream, filter)
}