Method validateLogFile

src/org/apache/pig/Main.java:992–1080

(String logFileName, File scriptFile)

    }

    private static String validateLogFile(String logFileName, File scriptFile) {
        String strippedDownScriptName = null;

        if (scriptFile != null) {
            if(!scriptFile.isDirectory()) {
                String scriptFileAbsPath;
                try {
                    scriptFileAbsPath = scriptFile.getCanonicalPath();
                    strippedDownScriptName = getFileFromCanonicalPath(scriptFileAbsPath);
                } catch (IOException ioe) {
                    log.warn("Could not compute canonical path to the script file " + ioe.getMessage());
                    strippedDownScriptName = null;
                }
            }
        }

        String defaultLogFileName = (strippedDownScriptName == null ? "pig_" : strippedDownScriptName) + new Date().getTime() + ".log";
        File logFile;

        if(logFileName != null) {
            logFile = new File(logFileName);

            //Check if the file name is a directory
            //append the default file name to the file
            if(logFile.isDirectory()) {
                if(logFile.canWrite()) {
                    try {
                        logFileName = logFile.getCanonicalPath() + File.separator + defaultLogFileName;
                    } catch (IOException ioe) {
                        log.warn("Could not compute canonical path to the log file " + ioe.getMessage());
                        return null;
                    }
                    return logFileName;
                } else {
                    log.warn("Need write permission in the directory: " + logFileName + " to create log file.");
                    return null;
                }
            } else {
                //we have a relative path or an absolute path to the log file
                //check if we can write to the directory where this file is/will be stored

                if (logFile.exists()) {
                    if(logFile.canWrite()) {
                        try {
                            logFileName = new File(logFileName).getCanonicalPath();
                        } catch (IOException ioe) {
                            log.warn("Could not compute canonical path to the log file " + ioe.getMessage());
                            return null;
                        }
                        return logFileName;
                    } else {
                        //do not have write permissions for the log file
                        //bail out with an error message
                        log.warn("Cannot write to file: " + logFileName + ". Need write permission.");
                        return logFileName;
                    }
                } else {
                    logFile = logFile.getParentFile();