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package module
import (
"io/ioutil"
"os"
"github.com/hashicorp/go-getter"
)
// GetMode is an enum that describes how modules are loaded.
//
// GetModeLoad says that modules will not be downloaded or updated, they will
// only be loaded from the storage.
//
// GetModeGet says that modules can be initially downloaded if they don't
// exist, but otherwise to just load from the current version in storage.
//
// GetModeUpdate says that modules should be checked for updates and
// downloaded prior to loading. If there are no updates, we load the version
// from disk, otherwise we download first and then load.
type GetMode byte
const (
GetModeNone GetMode = iota
GetModeGet
GetModeUpdate
)
// GetCopy is the same as Get except that it downloads a copy of the
// module represented by source.
//
// This copy will omit and dot-prefixed files (such as .git/, .hg/) and
// can't be updated on its own.
func GetCopy(dst, src string) error {
// Create the temporary directory to do the real Get to
tmpDir, err := ioutil.TempDir("", "tf")
if err != nil {
return err
}
// FIXME: This isn't completely safe. Creating and removing our temp path
// exposes where to race to inject files.
if err := os.RemoveAll(tmpDir); err != nil {
return err
}
defer os.RemoveAll(tmpDir)
// Get to that temporary dir
if err := getter.Get(tmpDir, src); err != nil {
return err
}
// Make sure the destination exists
if err := os.MkdirAll(dst, 0755); err != nil {
return err
}
// Copy to the final location
return copyDir(dst, tmpDir)
}
func getStorage(s getter.Storage, key string, src string, mode GetMode) (string, bool, error) {
// Get the module with the level specified if we were told to.
if mode > GetModeNone {
if err := s.Get(key, src, mode == GetModeUpdate); err != nil {
return "", false, err
}
}
// Get the directory where the module is.
return s.Dir(key)
}
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