func (s *releaseServer) uniqName(start string) (string, error) {
// If a name is supplied, we check to see if that name is taken. Right now,
// we fail if it is already taken. We could instead fall-thru and allow
// an automatically generated name, but this seems to violate the principle
// of least surprise.
if start != "" {
if _, err := s.env.Releases.Read(start); err == storage.ErrNotFound {
return start, nil
}
return "", fmt.Errorf("a release named %q already exists", start)
}
maxTries := 5
for i := 0; i < maxTries; i++ {
namer := moniker.New()
name := namer.NameSep("-")
if _, err := s.env.Releases.Read(name); err == storage.ErrNotFound {
return name, nil
}
log.Printf("info: Name %q is taken. Searching again.", name)
}
log.Printf("warning: No available release names found after %d tries", maxTries)
return "ERROR", errors.New("no available release name found")
}
func (s *releaseServer) uniqName(start string, reuse bool) (string, error) {
// If a name is supplied, we check to see if that name is taken. If not, it
// is granted. If reuse is true and a deleted release with that name exists,
// we re-grant it. Otherwise, an error is returned.
if start != "" {
if len(start) > releaseNameMaxLen {
return "", fmt.Errorf("release name %q exceeds max length of %d", start, releaseNameMaxLen)
}
h, err := s.env.Releases.History(start)
if err != nil || len(h) < 1 {
return start, nil
}
relutil.Reverse(h, relutil.SortByRevision)
rel := h[0]
if st := rel.Info.Status.Code; reuse && (st == release.Status_DELETED || st == release.Status_FAILED) {
// Allowe re-use of names if the previous release is marked deleted.
log.Printf("reusing name %q", start)
return start, nil
} else if reuse {
return "", errors.New("cannot re-use a name that is still in use")
}
return "", fmt.Errorf("a release named %q already exists", start)
}
maxTries := 5
for i := 0; i < maxTries; i++ {
namer := moniker.New()
name := namer.NameSep("-")
if len(name) > releaseNameMaxLen {
name = name[:releaseNameMaxLen]
}
if _, err := s.env.Releases.Get(name, 1); err == driver.ErrReleaseNotFound {
return name, nil
}
log.Printf("info: Name %q is taken. Searching again.", name)
}
log.Printf("warning: No available release names found after %d tries", maxTries)
return "ERROR", errors.New("no available release name found")
}