func (bc *fsBuildCache) InstallVersion(v versionutil.Version, target string) error {
cached := bc.getCached(v)
var cachedInit string
if cached == "" {
if v.Commit != "" {
return ErrCannotDownloadCommit
}
resp, err := http.Get(v.DownloadURL())
if err != nil {
return err
}
tf, err := bc.tempFile()
if err != nil {
return err
}
_, err = io.Copy(tf, resp.Body)
if err != nil {
if err := bc.cleanupTempFile(tf); err != nil {
// Just log
log.Printf("Error cleaning up temp file %v: %s", tf.Name(), err)
}
return err
}
cached, err = bc.saveVersion(tf, v)
if err != nil {
return err
}
// Remove any "-init"
cachedInit = initFile(cached)
if _, err := os.Stat(cachedInit); err == nil {
if err := os.Remove(cachedInit); err != nil {
return err
}
}
} else {
cachedInit = initFile(cached)
}
if err := CopyFile(cached, target, 0755); err != nil {
return err
}
targetInit := initFile(target)
if _, err := os.Stat(cachedInit); err == nil {
// Create target file, check if name starts with docker, replace with dockerinit
return CopyFile(cachedInit, targetInit, 0755)
}
if _, err := os.Stat(targetInit); err == nil {
// Truncate file, do not remove since operator may only have access
// to file and not directory. Future calls may rely on overwriting
// the content of this file.
vf, err := os.OpenFile(targetInit, os.O_TRUNC|os.O_WRONLY, 0755)
if err != nil {
return err
}
return vf.Close()
}
return nil
}
