helm/cmd/helm/root.go

/*
Copyright The Helm Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package main // import "helm.sh/helm/cmd/helm"

import (
	"io"

	"github.com/spf13/cobra"

	"helm.sh/helm/cmd/helm/require"
	"helm.sh/helm/internal/experimental/registry"
	"helm.sh/helm/pkg/action"
)

const (
	bashCompletionFunc = `
__helm_override_flag_list=(--kubeconfig --kube-context --home --namespace -n)
__helm_override_flags()
{
    local ${__helm_override_flag_list[*]##*-} two_word_of of var
    for w in "${words[@]}"; do
        if [ -n "${two_word_of}" ]; then
            eval "${two_word_of##*-}=\"${two_word_of}=\${w}\""
            two_word_of=
            continue
        fi
        for of in "${__helm_override_flag_list[@]}"; do
            case "${w}" in
                ${of}=*)
                    eval "${of##*-}=\"${w}\""
                    ;;
                ${of})
                    two_word_of="${of}"
                    ;;
            esac
        done
    done
    for var in "${__helm_override_flag_list[@]##*-}"; do
        if eval "test -n \"\$${var}\""; then
            eval "echo \${${var}}"
        fi
    done
}
__helm_list_releases()
{
	__helm_debug "${FUNCNAME[0]}: c is $c words[c] is ${words[c]}"
	local out filter
	# Use ^ to map from the start of the release name
	filter="^${words[c]}"
    if out=$(helm list $(__helm_override_flags) -a -q -m 1000 -f ${filter} 2>/dev/null); then
        COMPREPLY=( $( compgen -W "${out[*]}" -- "$cur" ) )
    fi
}
__helm_custom_func()
{
	__helm_debug "${FUNCNAME[0]}: last_command is $last_command"
    case ${last_command} in
		helm_uninstall | helm_history | helm_status | helm_test_run |\
	    helm_upgrade | helm_rollback | helm_get_*)
            __helm_list_releases
            return
            ;;
        *)
            ;;
    esac
}
`
)

var globalUsage = `The Kubernetes package manager

Common actions for Helm:

- helm search:    search for charts
- helm fetch:     download a chart to your local directory to view
- helm install:   upload the chart to Kubernetes
- helm list:      list releases of charts

Environment:
  $XDG_CACHE_HOME     set an alternative location for storing cached files.
  $XDG_CONFIG_HOME    set an alternative location for storing Helm configuration.
  $XDG_DATA_HOME      set an alternative location for storing Helm data.
  $HELM_DRIVER        set the backend storage driver. Values are: configmap, secret, memory
  $HELM_NO_PLUGINS    disable plugins. Set HELM_NO_PLUGINS=1 to disable plugins.
  $KUBECONFIG         set an alternative Kubernetes configuration file (default "~/.kube/config")
`

func newRootCmd(actionConfig *action.Configuration, out io.Writer, args []string) *cobra.Command {
	cmd := &cobra.Command{
		Use:                    "helm",
		Short:                  "The Helm package manager for Kubernetes.",
		Long:                   globalUsage,
		SilenceUsage:           true,
		Args:                   require.NoArgs,
		BashCompletionFunction: bashCompletionFunc,
	}
	flags := cmd.PersistentFlags()

	settings.AddFlags(flags)

	// We can safely ignore any errors that flags.Parse encounters since
	// those errors will be caught later during the call to cmd.Execution.
	// This call is required to gather configuration information prior to
	// execution.
	flags.ParseErrorsWhitelist.UnknownFlags = true
	flags.Parse(args)

	// set defaults from environment
	settings.Init(flags)

	// Add subcommands
	cmd.AddCommand(
		// chart commands
		newCreateCmd(out),
		newDependencyCmd(out),
		newPullCmd(out),
		newShowCmd(out),
		newLintCmd(out),
		newPackageCmd(out),
		newRepoCmd(out),
		newSearchCmd(out),
		newVerifyCmd(out),

		// release commands
		newGetCmd(actionConfig, out),
		newHistoryCmd(actionConfig, out),
		newInstallCmd(actionConfig, out),
		newListCmd(actionConfig, out),
		newReleaseTestCmd(actionConfig, out),
		newRollbackCmd(actionConfig, out),
		newStatusCmd(actionConfig, out),
		newTemplateCmd(actionConfig, out),
		newUninstallCmd(actionConfig, out),
		newUpgradeCmd(actionConfig, out),

		newCompletionCmd(out),
		newPluginCmd(out),
		newVersionCmd(out),

		// Hidden documentation generator command: 'helm docs'
		newDocsCmd(out),
	)

	// Add *experimental* subcommands
	registryClient, err := registry.NewClient(
		registry.ClientOptDebug(settings.Debug),
		registry.ClientOptWriter(out),
	)
	if err != nil {
		// TODO: dont panic here, refactor newRootCmd to return error
		panic(err)
	}
	actionConfig.RegistryClient = registryClient
	cmd.AddCommand(
		newRegistryCmd(actionConfig, out),
		newChartCmd(actionConfig, out),
	)

	// Find and add plugins
	loadPlugins(cmd, out)

	return cmd
}