mirror of
https://github.com/k3s-io/k3s.git
synced 2024-06-07 19:41:36 +00:00
593 lines
18 KiB
Go
593 lines
18 KiB
Go
/*
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Copyright 2014 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package cmd
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import (
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"flag"
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"fmt"
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"io"
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"os"
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"os/exec"
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"runtime"
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"strings"
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"syscall"
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"github.com/spf13/cobra"
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"k8s.io/client-go/tools/clientcmd"
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cliflag "k8s.io/component-base/cli/flag"
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cmdpkg "k8s.io/kubectl/pkg/cmd"
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"k8s.io/kubectl/pkg/cmd/annotate"
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"k8s.io/kubectl/pkg/cmd/apiresources"
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"k8s.io/kubectl/pkg/cmd/apply"
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"k8s.io/kubectl/pkg/cmd/attach"
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"k8s.io/kubectl/pkg/cmd/autoscale"
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"k8s.io/kubectl/pkg/cmd/certificates"
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"k8s.io/kubectl/pkg/cmd/clusterinfo"
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"k8s.io/kubectl/pkg/cmd/completion"
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cmdconfig "k8s.io/kubectl/pkg/cmd/config"
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"k8s.io/kubectl/pkg/cmd/create"
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"k8s.io/kubectl/pkg/cmd/delete"
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"k8s.io/kubectl/pkg/cmd/describe"
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"k8s.io/kubectl/pkg/cmd/diff"
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"k8s.io/kubectl/pkg/cmd/drain"
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"k8s.io/kubectl/pkg/cmd/edit"
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cmdexec "k8s.io/kubectl/pkg/cmd/exec"
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"k8s.io/kubectl/pkg/cmd/explain"
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"k8s.io/kubectl/pkg/cmd/expose"
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"k8s.io/kubectl/pkg/cmd/get"
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"k8s.io/kubectl/pkg/cmd/label"
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"k8s.io/kubectl/pkg/cmd/logs"
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"k8s.io/kubectl/pkg/cmd/options"
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"k8s.io/kubectl/pkg/cmd/patch"
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"k8s.io/kubectl/pkg/cmd/plugin"
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"k8s.io/kubectl/pkg/cmd/portforward"
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"k8s.io/kubectl/pkg/cmd/proxy"
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"k8s.io/kubectl/pkg/cmd/replace"
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"k8s.io/kubectl/pkg/cmd/rollout"
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"k8s.io/kubectl/pkg/cmd/run"
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"k8s.io/kubectl/pkg/cmd/scale"
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"k8s.io/kubectl/pkg/cmd/set"
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"k8s.io/kubectl/pkg/cmd/taint"
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"k8s.io/kubectl/pkg/cmd/top"
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cmdutil "k8s.io/kubectl/pkg/cmd/util"
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"k8s.io/kubectl/pkg/cmd/version"
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"k8s.io/kubectl/pkg/cmd/wait"
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"k8s.io/kubectl/pkg/util/i18n"
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"k8s.io/kubectl/pkg/util/templates"
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"k8s.io/kubernetes/pkg/kubectl/cmd/auth"
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"k8s.io/kubernetes/pkg/kubectl/cmd/convert"
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"k8s.io/kubernetes/pkg/kubectl/cmd/cp"
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"k8s.io/cli-runtime/pkg/genericclioptions"
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"k8s.io/kubectl/pkg/cmd/kustomize"
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)
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const (
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bashCompletionFunc = `# call kubectl get $1,
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__kubectl_debug_out()
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{
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local cmd="$1"
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__kubectl_debug "${FUNCNAME[1]}: get completion by ${cmd}"
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eval "${cmd} 2>/dev/null"
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}
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__kubectl_override_flag_list=(--kubeconfig --cluster --user --context --namespace --server -n -s)
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__kubectl_override_flags()
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{
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local ${__kubectl_override_flag_list[*]##*-} two_word_of of var
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for w in "${words[@]}"; do
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if [ -n "${two_word_of}" ]; then
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eval "${two_word_of##*-}=\"${two_word_of}=\${w}\""
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two_word_of=
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continue
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fi
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for of in "${__kubectl_override_flag_list[@]}"; do
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case "${w}" in
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${of}=*)
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eval "${of##*-}=\"${w}\""
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;;
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${of})
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two_word_of="${of}"
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;;
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esac
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done
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done
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for var in "${__kubectl_override_flag_list[@]##*-}"; do
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if eval "test -n \"\$${var}\""; then
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eval "echo -n \${${var}}' '"
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fi
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done
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}
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__kubectl_config_get_contexts()
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{
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__kubectl_parse_config "contexts"
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}
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__kubectl_config_get_clusters()
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{
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__kubectl_parse_config "clusters"
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}
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__kubectl_config_get_users()
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{
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__kubectl_parse_config "users"
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}
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# $1 has to be "contexts", "clusters" or "users"
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__kubectl_parse_config()
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{
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local template kubectl_out
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template="{{ range .$1 }}{{ .name }} {{ end }}"
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if kubectl_out=$(__kubectl_debug_out "kubectl config $(__kubectl_override_flags) -o template --template=\"${template}\" view"); then
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COMPREPLY=( $( compgen -W "${kubectl_out[*]}" -- "$cur" ) )
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fi
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}
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# $1 is the name of resource (required)
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# $2 is template string for kubectl get (optional)
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__kubectl_parse_get()
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{
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local template
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template="${2:-"{{ range .items }}{{ .metadata.name }} {{ end }}"}"
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local kubectl_out
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if kubectl_out=$(__kubectl_debug_out "kubectl get $(__kubectl_override_flags) -o template --template=\"${template}\" \"$1\""); then
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COMPREPLY+=( $( compgen -W "${kubectl_out[*]}" -- "$cur" ) )
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fi
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}
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__kubectl_get_resource()
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{
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if [[ ${#nouns[@]} -eq 0 ]]; then
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local kubectl_out
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if kubectl_out=$(__kubectl_debug_out "kubectl api-resources $(__kubectl_override_flags) -o name --cached --request-timeout=5s --verbs=get"); then
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COMPREPLY=( $( compgen -W "${kubectl_out[*]}" -- "$cur" ) )
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return 0
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fi
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return 1
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fi
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__kubectl_parse_get "${nouns[${#nouns[@]} -1]}"
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}
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__kubectl_get_resource_namespace()
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{
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__kubectl_parse_get "namespace"
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}
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__kubectl_get_resource_pod()
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{
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__kubectl_parse_get "pod"
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}
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__kubectl_get_resource_rc()
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{
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__kubectl_parse_get "rc"
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}
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__kubectl_get_resource_node()
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{
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__kubectl_parse_get "node"
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}
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__kubectl_get_resource_clusterrole()
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{
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__kubectl_parse_get "clusterrole"
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}
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# $1 is the name of the pod we want to get the list of containers inside
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__kubectl_get_containers()
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{
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local template
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template="{{ range .spec.initContainers }}{{ .name }} {{end}}{{ range .spec.containers }}{{ .name }} {{ end }}"
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__kubectl_debug "${FUNCNAME} nouns are ${nouns[*]}"
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local len="${#nouns[@]}"
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if [[ ${len} -ne 1 ]]; then
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return
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fi
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local last=${nouns[${len} -1]}
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local kubectl_out
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if kubectl_out=$(__kubectl_debug_out "kubectl get $(__kubectl_override_flags) -o template --template=\"${template}\" pods \"${last}\""); then
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COMPREPLY=( $( compgen -W "${kubectl_out[*]}" -- "$cur" ) )
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fi
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}
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# Require both a pod and a container to be specified
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__kubectl_require_pod_and_container()
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{
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if [[ ${#nouns[@]} -eq 0 ]]; then
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__kubectl_parse_get pods
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return 0
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fi;
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__kubectl_get_containers
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return 0
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}
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__kubectl_cp()
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{
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if [[ $(type -t compopt) = "builtin" ]]; then
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compopt -o nospace
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fi
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case "$cur" in
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/*|[.~]*) # looks like a path
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return
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;;
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*:*) # TODO: complete remote files in the pod
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return
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;;
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*/*) # complete <namespace>/<pod>
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local template namespace kubectl_out
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template="{{ range .items }}{{ .metadata.namespace }}/{{ .metadata.name }}: {{ end }}"
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namespace="${cur%%/*}"
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if kubectl_out=$(__kubectl_debug_out "kubectl get $(__kubectl_override_flags) --namespace \"${namespace}\" -o template --template=\"${template}\" pods"); then
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COMPREPLY=( $(compgen -W "${kubectl_out[*]}" -- "${cur}") )
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fi
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return
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;;
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*) # complete namespaces, pods, and filedirs
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__kubectl_parse_get "namespace" "{{ range .items }}{{ .metadata.name }}/ {{ end }}"
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__kubectl_parse_get "pod" "{{ range .items }}{{ .metadata.name }}: {{ end }}"
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_filedir
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;;
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esac
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}
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__kubectl_custom_func() {
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case ${last_command} in
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kubectl_get | kubectl_describe | kubectl_delete | kubectl_label | kubectl_edit | kubectl_patch |\
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kubectl_annotate | kubectl_expose | kubectl_scale | kubectl_autoscale | kubectl_taint | kubectl_rollout_* |\
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kubectl_apply_edit-last-applied | kubectl_apply_view-last-applied)
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__kubectl_get_resource
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return
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;;
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kubectl_logs)
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__kubectl_require_pod_and_container
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return
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;;
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kubectl_exec | kubectl_port-forward | kubectl_top_pod | kubectl_attach)
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__kubectl_get_resource_pod
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return
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;;
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kubectl_cordon | kubectl_uncordon | kubectl_drain | kubectl_top_node)
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__kubectl_get_resource_node
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return
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;;
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kubectl_config_use-context | kubectl_config_rename-context)
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__kubectl_config_get_contexts
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return
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;;
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kubectl_config_delete-cluster)
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__kubectl_config_get_clusters
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return
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;;
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kubectl_cp)
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__kubectl_cp
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return
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;;
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*)
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;;
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esac
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}
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`
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)
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var (
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bashCompletionFlags = map[string]string{
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"namespace": "__kubectl_get_resource_namespace",
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"context": "__kubectl_config_get_contexts",
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"cluster": "__kubectl_config_get_clusters",
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"user": "__kubectl_config_get_users",
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}
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)
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// NewDefaultKubectlCommand creates the `kubectl` command with default arguments
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func NewDefaultKubectlCommand() *cobra.Command {
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return NewDefaultKubectlCommandWithArgs(NewDefaultPluginHandler(plugin.ValidPluginFilenamePrefixes), os.Args, os.Stdin, os.Stdout, os.Stderr)
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}
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// NewDefaultKubectlCommandWithArgs creates the `kubectl` command with arguments
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func NewDefaultKubectlCommandWithArgs(pluginHandler PluginHandler, args []string, in io.Reader, out, errout io.Writer) *cobra.Command {
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cmd := NewKubectlCommand(in, out, errout)
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if pluginHandler == nil {
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return cmd
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}
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if len(args) > 1 {
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cmdPathPieces := args[1:]
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// only look for suitable extension executables if
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// the specified command does not already exist
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if _, _, err := cmd.Find(cmdPathPieces); err != nil {
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if err := HandlePluginCommand(pluginHandler, cmdPathPieces); err != nil {
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fmt.Fprintf(errout, "%v\n", err)
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os.Exit(1)
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}
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}
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}
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return cmd
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}
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// PluginHandler is capable of parsing command line arguments
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// and performing executable filename lookups to search
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// for valid plugin files, and execute found plugins.
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type PluginHandler interface {
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// exists at the given filename, or a boolean false.
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// Lookup will iterate over a list of given prefixes
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// in order to recognize valid plugin filenames.
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// The first filepath to match a prefix is returned.
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Lookup(filename string) (string, bool)
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// Execute receives an executable's filepath, a slice
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// of arguments, and a slice of environment variables
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// to relay to the executable.
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Execute(executablePath string, cmdArgs, environment []string) error
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}
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// DefaultPluginHandler implements PluginHandler
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type DefaultPluginHandler struct {
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ValidPrefixes []string
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}
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// NewDefaultPluginHandler instantiates the DefaultPluginHandler with a list of
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// given filename prefixes used to identify valid plugin filenames.
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func NewDefaultPluginHandler(validPrefixes []string) *DefaultPluginHandler {
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return &DefaultPluginHandler{
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ValidPrefixes: validPrefixes,
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}
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}
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// Lookup implements PluginHandler
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func (h *DefaultPluginHandler) Lookup(filename string) (string, bool) {
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for _, prefix := range h.ValidPrefixes {
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path, err := exec.LookPath(fmt.Sprintf("%s-%s", prefix, filename))
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if err != nil || len(path) == 0 {
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continue
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}
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return path, true
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}
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return "", false
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}
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// Execute implements PluginHandler
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func (h *DefaultPluginHandler) Execute(executablePath string, cmdArgs, environment []string) error {
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// Windows does not support exec syscall.
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if runtime.GOOS == "windows" {
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cmd := exec.Command(executablePath, cmdArgs...)
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cmd.Stdout = os.Stdout
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cmd.Stderr = os.Stderr
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cmd.Stdin = os.Stdin
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cmd.Env = environment
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err := cmd.Run()
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if err == nil {
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os.Exit(0)
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}
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return err
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}
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// invoke cmd binary relaying the environment and args given
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// append executablePath to cmdArgs, as execve will make first argument the "binary name".
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return syscall.Exec(executablePath, append([]string{executablePath}, cmdArgs...), environment)
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}
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// HandlePluginCommand receives a pluginHandler and command-line arguments and attempts to find
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// a plugin executable on the PATH that satisfies the given arguments.
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func HandlePluginCommand(pluginHandler PluginHandler, cmdArgs []string) error {
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remainingArgs := []string{} // all "non-flag" arguments
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for idx := range cmdArgs {
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if strings.HasPrefix(cmdArgs[idx], "-") {
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break
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}
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remainingArgs = append(remainingArgs, strings.Replace(cmdArgs[idx], "-", "_", -1))
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}
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foundBinaryPath := ""
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// attempt to find binary, starting at longest possible name with given cmdArgs
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for len(remainingArgs) > 0 {
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path, found := pluginHandler.Lookup(strings.Join(remainingArgs, "-"))
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if !found {
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remainingArgs = remainingArgs[:len(remainingArgs)-1]
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continue
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}
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foundBinaryPath = path
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break
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}
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if len(foundBinaryPath) == 0 {
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return nil
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}
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// invoke cmd binary relaying the current environment and args given
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if err := pluginHandler.Execute(foundBinaryPath, cmdArgs[len(remainingArgs):], os.Environ()); err != nil {
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return err
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}
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return nil
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}
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// NewKubectlCommand creates the `kubectl` command and its nested children.
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func NewKubectlCommand(in io.Reader, out, err io.Writer) *cobra.Command {
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// Parent command to which all subcommands are added.
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cmds := &cobra.Command{
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Use: "kubectl",
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Short: i18n.T("kubectl controls the Kubernetes cluster manager"),
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Long: templates.LongDesc(`
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kubectl controls the Kubernetes cluster manager.
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Find more information at:
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https://kubernetes.io/docs/reference/kubectl/overview/`),
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Run: runHelp,
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// Hook before and after Run initialize and write profiles to disk,
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// respectively.
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PersistentPreRunE: func(*cobra.Command, []string) error {
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return initProfiling()
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},
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PersistentPostRunE: func(*cobra.Command, []string) error {
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return flushProfiling()
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},
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BashCompletionFunction: bashCompletionFunc,
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}
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flags := cmds.PersistentFlags()
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flags.SetNormalizeFunc(cliflag.WarnWordSepNormalizeFunc) // Warn for "_" flags
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// Normalize all flags that are coming from other packages or pre-configurations
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// a.k.a. change all "_" to "-". e.g. glog package
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flags.SetNormalizeFunc(cliflag.WordSepNormalizeFunc)
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addProfilingFlags(flags)
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kubeConfigFlags := genericclioptions.NewConfigFlags(true).WithDeprecatedPasswordFlag()
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kubeConfigFlags.AddFlags(flags)
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matchVersionKubeConfigFlags := cmdutil.NewMatchVersionFlags(kubeConfigFlags)
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matchVersionKubeConfigFlags.AddFlags(cmds.PersistentFlags())
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cmds.PersistentFlags().AddGoFlagSet(flag.CommandLine)
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f := cmdutil.NewFactory(matchVersionKubeConfigFlags)
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// Sending in 'nil' for the getLanguageFn() results in using
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// the LANG environment variable.
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//
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// TODO: Consider adding a flag or file preference for setting
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// the language, instead of just loading from the LANG env. variable.
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i18n.LoadTranslations("kubectl", nil)
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// From this point and forward we get warnings on flags that contain "_" separators
|
|
cmds.SetGlobalNormalizationFunc(cliflag.WarnWordSepNormalizeFunc)
|
|
|
|
ioStreams := genericclioptions.IOStreams{In: in, Out: out, ErrOut: err}
|
|
|
|
groups := templates.CommandGroups{
|
|
{
|
|
Message: "Basic Commands (Beginner):",
|
|
Commands: []*cobra.Command{
|
|
create.NewCmdCreate(f, ioStreams),
|
|
expose.NewCmdExposeService(f, ioStreams),
|
|
run.NewCmdRun(f, ioStreams),
|
|
set.NewCmdSet(f, ioStreams),
|
|
},
|
|
},
|
|
{
|
|
Message: "Basic Commands (Intermediate):",
|
|
Commands: []*cobra.Command{
|
|
explain.NewCmdExplain("kubectl", f, ioStreams),
|
|
get.NewCmdGet("kubectl", f, ioStreams),
|
|
edit.NewCmdEdit(f, ioStreams),
|
|
delete.NewCmdDelete(f, ioStreams),
|
|
},
|
|
},
|
|
{
|
|
Message: "Deploy Commands:",
|
|
Commands: []*cobra.Command{
|
|
rollout.NewCmdRollout(f, ioStreams),
|
|
scale.NewCmdScale(f, ioStreams),
|
|
autoscale.NewCmdAutoscale(f, ioStreams),
|
|
},
|
|
},
|
|
{
|
|
Message: "Cluster Management Commands:",
|
|
Commands: []*cobra.Command{
|
|
certificates.NewCmdCertificate(f, ioStreams),
|
|
clusterinfo.NewCmdClusterInfo(f, ioStreams),
|
|
top.NewCmdTop(f, ioStreams),
|
|
drain.NewCmdCordon(f, ioStreams),
|
|
drain.NewCmdUncordon(f, ioStreams),
|
|
drain.NewCmdDrain(f, ioStreams),
|
|
taint.NewCmdTaint(f, ioStreams),
|
|
},
|
|
},
|
|
{
|
|
Message: "Troubleshooting and Debugging Commands:",
|
|
Commands: []*cobra.Command{
|
|
describe.NewCmdDescribe("kubectl", f, ioStreams),
|
|
logs.NewCmdLogs(f, ioStreams),
|
|
attach.NewCmdAttach(f, ioStreams),
|
|
cmdexec.NewCmdExec(f, ioStreams),
|
|
portforward.NewCmdPortForward(f, ioStreams),
|
|
proxy.NewCmdProxy(f, ioStreams),
|
|
cp.NewCmdCp(f, ioStreams),
|
|
auth.NewCmdAuth(f, ioStreams),
|
|
},
|
|
},
|
|
{
|
|
Message: "Advanced Commands:",
|
|
Commands: []*cobra.Command{
|
|
diff.NewCmdDiff(f, ioStreams),
|
|
apply.NewCmdApply("kubectl", f, ioStreams),
|
|
patch.NewCmdPatch(f, ioStreams),
|
|
replace.NewCmdReplace(f, ioStreams),
|
|
wait.NewCmdWait(f, ioStreams),
|
|
convert.NewCmdConvert(f, ioStreams),
|
|
kustomize.NewCmdKustomize(ioStreams),
|
|
},
|
|
},
|
|
{
|
|
Message: "Settings Commands:",
|
|
Commands: []*cobra.Command{
|
|
label.NewCmdLabel(f, ioStreams),
|
|
annotate.NewCmdAnnotate("kubectl", f, ioStreams),
|
|
completion.NewCmdCompletion(ioStreams.Out, ""),
|
|
},
|
|
},
|
|
}
|
|
groups.Add(cmds)
|
|
|
|
filters := []string{"options"}
|
|
|
|
// Hide the "alpha" subcommand if there are no alpha commands in this build.
|
|
alpha := cmdpkg.NewCmdAlpha(f, ioStreams)
|
|
if !alpha.HasSubCommands() {
|
|
filters = append(filters, alpha.Name())
|
|
}
|
|
|
|
templates.ActsAsRootCommand(cmds, filters, groups...)
|
|
|
|
for name, completion := range bashCompletionFlags {
|
|
if cmds.Flag(name) != nil {
|
|
if cmds.Flag(name).Annotations == nil {
|
|
cmds.Flag(name).Annotations = map[string][]string{}
|
|
}
|
|
cmds.Flag(name).Annotations[cobra.BashCompCustom] = append(
|
|
cmds.Flag(name).Annotations[cobra.BashCompCustom],
|
|
completion,
|
|
)
|
|
}
|
|
}
|
|
|
|
cmds.AddCommand(alpha)
|
|
cmds.AddCommand(cmdconfig.NewCmdConfig(f, clientcmd.NewDefaultPathOptions(), ioStreams))
|
|
cmds.AddCommand(plugin.NewCmdPlugin(f, ioStreams))
|
|
cmds.AddCommand(version.NewCmdVersion(f, ioStreams))
|
|
cmds.AddCommand(apiresources.NewCmdAPIVersions(f, ioStreams))
|
|
cmds.AddCommand(apiresources.NewCmdAPIResources(f, ioStreams))
|
|
cmds.AddCommand(options.NewCmdOptions(ioStreams.Out))
|
|
|
|
return cmds
|
|
}
|
|
|
|
func runHelp(cmd *cobra.Command, args []string) {
|
|
cmd.Help()
|
|
}
|