public static File resolveAbsolutely(String pathToResolve, String baseDir) {
        // TODO: handle the case where pathToResolve specifies a non-existent path, for example, a base directory equal to "/" and a relative path of "../../foo".
        File fileToResolve = new File(pathToResolve);

        if (fileToResolve.isAbsolute()) {
            return fileToResolve;
        }

        if (baseDir == null) {
            throw new IllegalArgumentException("Cannot resolve relative path '" + pathToResolve + "' with a " +
                    "null base directory.");
        }

        File baseDirAsFile = new File(baseDir);
        if (!baseDirAsFile.isAbsolute()) {
            throw new IllegalArgumentException("Base directory '" + baseDirAsFile + "' must be absolute");
        }

        final File toCanonicalize = new File(baseDirAsFile, pathToResolve);
        try {
            return toCanonicalize.getCanonicalFile();
        } catch (IOException e) {
            throw new RuntimeException("Unable to canonicalize the file path '" + toCanonicalize + "'");
        }
    }
Resolves the supplied resource (a path or directory on the filesystem) relative the supplied {@code
baseDir}.  The returned {@code File} is guaranteed to be {@link File#isAbsolute() absolute}.  The returned file
is <em>not</em> guaranteed to exist.
<p>
If the supplied {@code pathToResolve} is already {@link File#isAbsolute() absolute}, then it is returned
<em>unmodified</em>.  Otherwise, the {@code pathToResolve} is returned as an absolute {@code File} using the
supplied {@code baseDir} as its parent.
</p>

@param pathToResolve represents a filesystem resource, which may be an absolute path
@param baseDir the absolute path used to resolve non-absolute path resources; <em>must</em> be absolute
@return an absolute {@code File} reference to {@code pathToResolve}; <em>not</em> guaranteed to exist
@throws IllegalArgumentException if the supplied {@code baseDir} does not represent an absolute path
src/main/java/io/fabric8/maven/docker/util/DockerPathUtil.java