return new GitVersionRef(version, canonicalId);
    }

    @Override
    public String getVersion() {
        return version;
    }

    @Override
    public String getCanonicalId() {
        return canonicalId;
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == null || obj.getClass() != this.getClass()) {
            return false;
        }

                    setDirectory(workingDir).
                    setCloneSubmodules(true);
            git = clone.call();
            git.reset().setMode(ResetCommand.ResetType.HARD).setRef(ref.getCanonicalId()).call();
        } catch (GitAPIException | URISyntaxException | JGitInternalException e) {
            throw wrapGitCommandException("clone", gitSpec.getUrl(), workingDir, e);
        } finally {

     */
    String getVersion();

    /**
     * Returns a canonical representation of this version of the software
     * component, which may be different from the human-readable version.
     */
    String getCanonicalId();

        public void write(Encoder encoder, VersionRef value) throws Exception {
            GitVersionRef gitRef = (GitVersionRef) value;
            encoder.writeString(gitRef.getVersion());
            encoder.writeString(gitRef.getCanonicalId());
        }

        @Override
        public VersionRef read(Decoder decoder) throws Exception {
            String version = decoder.readString();
            String canonicalId = decoder.readString();

        resolvedVersions.put(cacheKey, workingDir);
    }

    private String versionCacheKey(VersionControlRepositoryConnection repository, VersionRef version) {
        return repository.getUniqueId() + ":" + version.getCanonicalId();
    }

    private String constraintCacheKey(VersionControlRepositoryConnection repository, VersionConstraint constraint) {
        if (constraint.getBranch() != null) {

                        String prefix = repoName.length() <= 9 ? repoName : repoName.substring(0, 10);
                        String versionId = prefix + "_" + hashString(getUniqueId() + "-" + ref.getCanonicalId()).toCompactString();
                        File baseDir = new File(cacheAccess.getBaseDir(), versionId);
                        File workingDir = new File(baseDir, repoName);