github.com/stefanmcshane/helm@v0.0.0-20221213002717-88a4a2c6e77d/pkg/plugin/installer/local_installer.go (about)

     1  /*
     2  Copyright The Helm Authors.
     3  Licensed under the Apache License, Version 2.0 (the "License");
     4  you may not use this file except in compliance with the License.
     5  You may obtain a copy of the License at
     6  
     7  http://www.apache.org/licenses/LICENSE-2.0
     8  
     9  Unless required by applicable law or agreed to in writing, software
    10  distributed under the License is distributed on an "AS IS" BASIS,
    11  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  See the License for the specific language governing permissions and
    13  limitations under the License.
    14  */
    15  
    16  package installer // import "github.com/stefanmcshane/helm/pkg/plugin/installer"
    17  
    18  import (
    19  	"os"
    20  	"path/filepath"
    21  
    22  	"github.com/pkg/errors"
    23  )
    24  
    25  // ErrPluginNotAFolder indicates that the plugin path is not a folder.
    26  var ErrPluginNotAFolder = errors.New("expected plugin to be a folder")
    27  
    28  // LocalInstaller installs plugins from the filesystem.
    29  type LocalInstaller struct {
    30  	base
    31  }
    32  
    33  // NewLocalInstaller creates a new LocalInstaller.
    34  func NewLocalInstaller(source string) (*LocalInstaller, error) {
    35  	src, err := filepath.Abs(source)
    36  	if err != nil {
    37  		return nil, errors.Wrap(err, "unable to get absolute path to plugin")
    38  	}
    39  	i := &LocalInstaller{
    40  		base: newBase(src),
    41  	}
    42  	return i, nil
    43  }
    44  
    45  // Install creates a symlink to the plugin directory.
    46  //
    47  // Implements Installer.
    48  func (i *LocalInstaller) Install() error {
    49  	stat, err := os.Stat(i.Source)
    50  	if err != nil {
    51  		return err
    52  	}
    53  	if !stat.IsDir() {
    54  		return ErrPluginNotAFolder
    55  	}
    56  
    57  	if !isPlugin(i.Source) {
    58  		return ErrMissingMetadata
    59  	}
    60  	debug("symlinking %s to %s", i.Source, i.Path())
    61  	return os.Symlink(i.Source, i.Path())
    62  }
    63  
    64  // Update updates a local repository
    65  func (i *LocalInstaller) Update() error {
    66  	debug("local repository is auto-updated")
    67  	return nil
    68  }