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112 lines
3.0 KiB
112 lines
3.0 KiB
/*
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Copyright The Helm 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 installer
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import (
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"fmt"
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"os"
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"path/filepath"
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"strings"
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"github.com/pkg/errors"
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)
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// ErrMissingMetadata indicates that plugin.yaml is missing.
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var ErrMissingMetadata = errors.New("plugin metadata (plugin.yaml) missing")
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// Debug enables verbose output.
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var Debug bool
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// Installer provides an interface for installing helm client plugins.
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type Installer interface {
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// Install adds a plugin.
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Install() error
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// Path is the directory of the installed plugin.
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Path() string
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// Update updates a plugin.
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Update() error
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}
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// Install installs a plugin.
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func Install(i Installer) error {
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if err := os.MkdirAll(filepath.Dir(i.Path()), 0755); err != nil {
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return err
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}
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if _, pathErr := os.Stat(i.Path()); !os.IsNotExist(pathErr) {
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return errors.New("plugin already exists")
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}
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return i.Install()
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}
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// Update updates a plugin.
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func Update(i Installer) error {
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if _, pathErr := os.Stat(i.Path()); os.IsNotExist(pathErr) {
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return errors.New("plugin does not exist")
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}
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return i.Update()
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}
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// NewForSource determines the correct Installer for the given source.
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func NewForSource(source, version string) (Installer, error) {
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// Check if source is a local directory
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if isLocalReference(source) {
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return NewLocalInstaller(source)
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} else if isRemoteHTTPArchive(source) {
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return NewHTTPInstaller(source)
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}
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return NewVCSInstaller(source, version)
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}
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// FindSource determines the correct Installer for the given source.
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func FindSource(location string) (Installer, error) {
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installer, err := existingVCSRepo(location)
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if err != nil && err.Error() == "Cannot detect VCS" {
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return installer, errors.New("cannot get information about plugin source")
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}
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return installer, err
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}
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// isLocalReference checks if the source exists on the filesystem.
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func isLocalReference(source string) bool {
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_, err := os.Stat(source)
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return err == nil
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}
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// isRemoteHTTPArchive checks if the source is a http/https url and is an archive
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func isRemoteHTTPArchive(source string) bool {
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if strings.HasPrefix(source, "http://") || strings.HasPrefix(source, "https://") {
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for suffix := range Extractors {
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if strings.HasSuffix(source, suffix) {
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return true
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}
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}
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}
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return false
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}
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// isPlugin checks if the directory contains a plugin.yaml file.
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func isPlugin(dirname string) bool {
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_, err := os.Stat(filepath.Join(dirname, "plugin.yaml"))
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return err == nil
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}
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func debug(format string, args ...interface{}) {
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if Debug {
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format = fmt.Sprintf("[debug] %s\n", format)
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fmt.Printf(format, args...)
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}
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}
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