github.com/rohankumardubey/draft-classic@v0.16.0/pkg/plugin/installer/installer.go (about)

     1  package installer
     2  
     3  import (
     4  	"fmt"
     5  	"os"
     6  	"path/filepath"
     7  
     8  	"github.com/Azure/draft/pkg/draft/draftpath"
     9  	"github.com/Azure/draft/pkg/plugin"
    10  )
    11  
    12  // special thanks to the Kubernets Helm plugin installer pkg
    13  
    14  // Debug enables verbose output.
    15  var Debug bool
    16  
    17  // Installer provides an interface for installing client plugins.
    18  type Installer interface {
    19  	// Install adds a plugin to a path
    20  	Install() error
    21  	// Path is the directory of the installed plugin.
    22  	Path() string
    23  	// Update updates a plugin to $DRAFT_HOME.
    24  	Update() error
    25  }
    26  
    27  // Install installs a plugin to $DRAFT_HOME
    28  func Install(i Installer) error {
    29  	if _, pathErr := os.Stat(filepath.Dir(i.Path())); os.IsNotExist(pathErr) {
    30  
    31  		return plugin.ErrHomeMissing
    32  	}
    33  
    34  	if _, pathErr := os.Stat(i.Path()); !os.IsNotExist(pathErr) {
    35  		return plugin.ErrExists
    36  	}
    37  
    38  	return i.Install()
    39  }
    40  
    41  // Update updates a plugin in $DRAFT_HOME.
    42  func Update(i Installer) error {
    43  	if _, pathErr := os.Stat(i.Path()); os.IsNotExist(pathErr) {
    44  		return plugin.ErrDoesNotExist
    45  	}
    46  
    47  	return i.Update()
    48  }
    49  
    50  // FindSource determines the correct Installer for the given source.
    51  func FindSource(location string, home draftpath.Home) (Installer, error) {
    52  	installer, err := existingVCSRepo(location, home)
    53  	if err != nil && err.Error() == "Cannot detect VCS" {
    54  		return installer, plugin.ErrMissingSource
    55  	}
    56  	return installer, err
    57  }
    58  
    59  // New determines and returns the correct Installer for the given source
    60  func New(source, version string, home draftpath.Home) (Installer, error) {
    61  	if isLocalReference(source) {
    62  		return NewLocalInstaller(source, home)
    63  	}
    64  
    65  	return NewVCSInstaller(source, version, home)
    66  }
    67  
    68  func debug(format string, args ...interface{}) {
    69  	if Debug {
    70  		format = fmt.Sprintf("[debug] %s\n", format)
    71  		fmt.Printf(format, args...)
    72  	}
    73  }
    74  
    75  // isLocalReference checks if the source exists on the filesystem.
    76  func isLocalReference(source string) bool {
    77  	_, err := os.Stat(source)
    78  	return err == nil
    79  }
    80  
    81  // isPlugin checks if the directory contains a plugin.yaml file.
    82  func isPlugin(dirname string) bool {
    83  	_, err := os.Stat(filepath.Join(dirname, "plugin.yaml"))
    84  	return err == nil
    85  }