github.com/chalford/terraform@v0.3.7-0.20150113080010-a78c69a8c81f/config/module/folder_storage.go (about)

     1  package module
     2  
     3  import (
     4  	"crypto/md5"
     5  	"encoding/hex"
     6  	"fmt"
     7  	"os"
     8  	"path/filepath"
     9  )
    10  
    11  // FolderStorage is an implementation of the Storage interface that manages
    12  // modules on the disk.
    13  type FolderStorage struct {
    14  	// StorageDir is the directory where the modules will be stored.
    15  	StorageDir string
    16  }
    17  
    18  // Dir implements Storage.Dir
    19  func (s *FolderStorage) Dir(source string) (d string, e bool, err error) {
    20  	d = s.dir(source)
    21  	_, err = os.Stat(d)
    22  	if err == nil {
    23  		// Directory exists
    24  		e = true
    25  		return
    26  	}
    27  	if os.IsNotExist(err) {
    28  		// Directory doesn't exist
    29  		d = ""
    30  		e = false
    31  		err = nil
    32  		return
    33  	}
    34  
    35  	// An error
    36  	d = ""
    37  	e = false
    38  	return
    39  }
    40  
    41  // Get implements Storage.Get
    42  func (s *FolderStorage) Get(source string, update bool) error {
    43  	dir := s.dir(source)
    44  	if !update {
    45  		if _, err := os.Stat(dir); err == nil {
    46  			// If the directory already exists, then we're done since
    47  			// we're not updating.
    48  			return nil
    49  		} else if !os.IsNotExist(err) {
    50  			// If the error we got wasn't a file-not-exist error, then
    51  			// something went wrong and we should report it.
    52  			return fmt.Errorf("Error reading module directory: %s", err)
    53  		}
    54  	}
    55  
    56  	// Get the source. This always forces an update.
    57  	return Get(dir, source)
    58  }
    59  
    60  // dir returns the directory name internally that we'll use to map to
    61  // internally.
    62  func (s *FolderStorage) dir(source string) string {
    63  	sum := md5.Sum([]byte(source))
    64  	return filepath.Join(s.StorageDir, hex.EncodeToString(sum[:]))
    65  }