// Stage causes subsequent calls to Deploy to deploy the supplied charm.
func (d *Deployer) Stage(bun *charm.Bundle, url *charm.URL) error {
// Read present state of current.
if err := os.MkdirAll(d.path, 0755); err != nil {
return err
}
defer d.collectOrphans()
srcExists, err := d.current.Exists()
if err != nil {
return err
}
if srcExists {
prevURL, err := ReadCharmURL(d.current)
if err != nil {
return err
}
if *url == *prevURL {
return nil
}
}
// Prepare a fresh repository for the update, using current's history
// if it exists.
path, err := d.newDir("update")
if err != nil {
return err
}
var repo *GitDir
if srcExists {
repo, err = d.current.Clone(path)
} else {
repo = NewGitDir(path)
err = repo.Init()
}
if err != nil {
return err
}
// Write the desired new state and commit.
if err = bun.ExpandTo(path); err != nil {
return err
}
if err = WriteCharmURL(repo, url); err != nil {
return err
}
if err = repo.Snapshotf("Imported charm %q from %q.", url, bun.Path); err != nil {
return err
}
// Atomically rename fresh repository to current.
tmplink := filepath.Join(path, "tmplink")
if err = os.Symlink(path, tmplink); err != nil {
return err
}
return os.Rename(tmplink, d.current.Path())
}
// SetCharm adds and removes charms in s. The affected charm is identified by
// charmURL, which must be revisioned. If bundle is nil, the charm will be
// removed; otherwise, it will be stored. It is an error to store a bundle
// under a charmURL that does not share its name and revision.
func (s *MockCharmStore) SetCharm(charmURL *charm.URL, bundle *charm.Bundle) error {
base := charmURL.WithRevision(-1).String()
if charmURL.Revision < 0 {
return fmt.Errorf("bad charm url revision")
}
if bundle == nil {
delete(s.charms[base], charmURL.Revision)
return nil
}
bundleRev := bundle.Revision()
bundleName := bundle.Meta().Name
if bundleName != charmURL.Name || bundleRev != charmURL.Revision {
return fmt.Errorf("charm url %s mismatch with bundle %s-%d", charmURL, bundleName, bundleRev)
}
if _, found := s.charms[base]; !found {
s.charms[base] = map[int]*charm.Bundle{}
}
s.charms[base][charmURL.Revision] = bundle
return nil
}
func assertCharm(c *C, bun *corecharm.Bundle, sch *state.Charm) {
c.Assert(bun.Revision(), Equals, sch.Revision())
c.Assert(bun.Meta(), DeepEquals, sch.Meta())
c.Assert(bun.Config(), DeepEquals, sch.Config())
}