pegasus-wms 4.0.1+dfsg-8 / usr / bin / pegasus-create-dir

#!/usr/bin/env python

"""
Pegasus utility for creating directories for a set of protocols

Usage: pegasus-create-dir [options]

"""

##
#  Copyright 2007-2011 University Of Southern California
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#  http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing,
#  software distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.
##

import os
import re
import sys
import errno
import logging
import optparse
import tempfile
import subprocess
import signal
import string
import stat
import time
from collections import deque


__author__ = "Mats Rynge <rynge@isi.edu>"

# --- regular expressions -------------------------------------------------------------

re_parse_url = re.compile(r'([\w]+)://([\w\.\-:@]*)(/[\S]*)')

# --- classes -------------------------------------------------------------------------

class URL:

    proto      = ""
    host       = ""
    path       = ""

    def set_url(self, url):
        self.proto, self.host, self.path = self.parse_url(url)
    
    def parse_url(self, url):

        proto = ""
        host  = ""
        path  = ""

        # default protocol is file://
        if string.find(url, ":") == -1:
            logger.debug("URL without protocol (" + url + ") - assuming file://")
            url = "file://" + url

        # file url is a special cases as it can contain relative paths and env vars
        if string.find(url, "file:") == 0:
            proto = "file"
            # file urls can either start with file://[\w]*/ or file: (no //)
            path = re.sub("^file:(//[\w\.\-:@]*)?", "", url)
            path = expand_env_vars(path)
            return proto, host, path

        # other than file urls
        r = re_parse_url.search(url)
        if not r:
            raise RuntimeError("Unable to parse URL: %s" % (url))
        
        # Parse successful
        proto = r.group(1)
        host = r.group(2)
        path = r.group(3)
        
        # no double slashes in urls
        path = re.sub('//+', '/', path)
        
        return proto, host, path

    def url(self):
        return "%s://%s%s" % (self.proto, self.host, self.path)
    
    def url_dirname(self):
        dn = os.path.dirname(self.path)
        return "%s://%s%s" % (self.proto, self.host, dn)

    def parent_url(self):
        parent = URL()
        parent.proto = self.proto
        parent.host = self.host
        parent.path = os.path.dirname(self.path)
        return parent


class Alarm(Exception):
    pass


# --- global variables ----------------------------------------------------------------

prog_base = os.path.split(sys.argv[0])[1]   # Name of this program

logger = logging.getLogger("my_logger")


# this is the map of what tool to use for a given protocol pair (src, dest)
tool_map = {}
tool_map['file'  ] = 'mkdir'
tool_map['ftp'   ] = 'gsiftp'
tool_map['gsiftp'] = 'gsiftp'
tool_map['irods' ] = 'irods'
tool_map['s3'    ] = 's3'
tool_map['s3s'   ] = 's3'
tool_map['scp'   ] = 'scp'
tool_map['srm'   ] = 'srm'

tool_info = {}


# --- functions -----------------------------------------------------------------------


def setup_logger(level_str):
    
    # log to the console
    console = logging.StreamHandler()
    
    # default log level - make logger/console match
    logger.setLevel(logging.INFO)
    console.setLevel(logging.INFO)

    # level - from the command line
    level_str = level_str.lower()
    if level_str == "debug":
        logger.setLevel(logging.DEBUG)
        console.setLevel(logging.DEBUG)
    if level_str == "warning":
        logger.setLevel(logging.WARNING)
        console.setLevel(logging.WARNING)
    if level_str == "error":
        logger.setLevel(logging.ERROR)
        console.setLevel(logging.ERROR)

    # formatter
    formatter = logging.Formatter("%(asctime)s %(levelname)7s:  %(message)s")
    console.setFormatter(formatter)
    logger.addHandler(console)
    logger.debug("Logger has been configured")

def prog_sigint_handler(signum, frame):
    logger.warn("Exiting due to signal %d" % (signum))
    myexit(1)

def alarm_handler(signum, frame):
    raise Alarm


def expand_env_vars(s):
    re_env_var = re.compile(r'\${?([a-zA-Z0-9_]+)}?')
    s = re.sub(re_env_var, get_env_var, s)
    return s


def get_env_var(match):
    name = match.group(1)
    value = ""
    logger.debug("Looking up " + name)
    if name in os.environ:
        value = os.environ[name]
    return value


def myexec(cmd_line, timeout_secs, should_log):
    """
    executes shell commands with the ability to time out if the command hangs
    """
    global delay_exit_code
    if should_log or logger.isEnabledFor(logging.DEBUG):
        logger.info(cmd_line)
    sys.stdout.flush()

    # set up signal handler for timeout
    signal.signal(signal.SIGALRM, alarm_handler)
    signal.alarm(timeout_secs)

    p = subprocess.Popen(cmd_line + " 2>&1", shell=True)
    try:
        stdoutdata, stderrdata = p.communicate()
    except Alarm:
        if sys.version_info >= (2, 6):
            p.terminate()
        raise RuntimeError("Command '%s' timed out after %s seconds" % (cmd_line, timeout_secs))
    rc = p.returncode
    if rc != 0:
        raise RuntimeError("Command '%s' failed with error code %s" % (cmd_line, rc))


def backticks(cmd_line):
    """
    what would a python program be without some perl love?
    """
    return subprocess.Popen(cmd_line, shell=True, stdout=subprocess.PIPE).communicate()[0]


def check_tool(executable, version_arg, version_regex):
    # initialize the global tool info for this executable
    tool_info[executable] = {}
    tool_info[executable]['full_path'] = None
    tool_info[executable]['version'] = None
    tool_info[executable]['version_major'] = None
    tool_info[executable]['version_minor'] = None
    tool_info[executable]['version_patch'] = None

    # figure out the full path to the executable
    full_path = backticks("which " + executable + " 2>/dev/null") 
    full_path = full_path.rstrip('\n')
    if full_path == "":
        logger.info("Command '%s' not found in the current environment" %(executable))
        return
    tool_info[executable]['full_path'] = full_path

    # version
    if version_regex == None:
        version = "N/A"
    else:
        version = backticks(executable + " " + version_arg + " 2>&1")
        version = version.replace('\n', "")
        re_version = re.compile(version_regex)
        result = re_version.search(version)
        if result:
            version = result.group(1)
        tool_info[executable]['version'] = version

    # if possible, break up version into major, minor, patch
    re_version = re.compile("([0-9]+)\.([0-9]+)(\.([0-9]+)){0,1}")
    result = re_version.search(version)
    if result:
        tool_info[executable]['version_major'] = int(result.group(1))
        tool_info[executable]['version_minor'] = int(result.group(2))
        tool_info[executable]['version_patch'] = result.group(4)
    if tool_info[executable]['version_patch'] == None or tool_info[executable]['version_patch'] == "":
        tool_info[executable]['version_patch'] = None
    else:
        tool_info[executable]['version_patch'] = int(tool_info[executable]['version_patch'])

    logger.info("  %-18s Version: %-7s Path: %s" % (executable, version, full_path))


def check_env_and_tools():
    
    # PATH setup
    path = "/usr/bin:/bin"
    if "PATH" in os.environ:
        path = os.environ['PATH']
    path_entries = path.split(':')
    
    # is /usr/bin in the path?
    if not("/usr/bin" in path_entries):
        path_entries.append("/usr/bin")
        path_entries.append("/bin")
       
    # fink on macos x
    if os.path.exists("/sw/bin") and not("/sw/bin" in path_entries):
        path_entries.append("/sw/bin")
       
    # need LD_LIBRARY_PATH for Globus tools
    ld_library_path = ""
    if "LD_LIBRARY_PATH" in os.environ:
        ld_library_path = os.environ['LD_LIBRARY_PATH']
    ld_library_path_entries = ld_library_path.split(':')
    
    # if PEGASUS_HOME is set, prepend it to the PATH (we want it early to override other cruft)
    if "PEGASUS_HOME" in os.environ:
        try:
            path_entries.remove(os.environ['PEGASUS_HOME'] + "/bin")
        except Exception:
            pass
        path_entries.insert(0, os.environ['PEGASUS_HOME'] + "/bin")
    
    # if GLOBUS_LOCATION is set, prepend it to the PATH and LD_LIBRARY_PATH 
    # (we want it early to override other cruft)
    if "GLOBUS_LOCATION" in os.environ:
        try:
            path_entries.remove(os.environ['GLOBUS_LOCATION'] + "/bin")
        except Exception:
            pass
        path_entries.insert(0, os.environ['GLOBUS_LOCATION'] + "/bin")
        try:
            ld_library_path_entries.remove(os.environ['GLOBUS_LOCATION'] + "/lib")
        except Exception:
            pass
        ld_library_path_entries.insert(0, os.environ['GLOBUS_LOCATION'] + "/lib")

    os.environ['PATH'] = ":".join(path_entries)
    os.environ['LD_LIBRARY_PATH'] = ":".join(ld_library_path_entries)
    os.environ['DYLD_LIBRARY_PATH'] = ":".join(ld_library_path_entries)
    logger.info("PATH=" + os.environ['PATH'])
    logger.info("LD_LIBRARY_PATH=" + os.environ['LD_LIBRARY_PATH'])
    
    # irods requires a password hash file
    os.environ['irodsAuthFileName'] = os.getcwd() + "/.irodsA"
    


def mkdir(url):
    """
    creates a directory on a mounted file system
    """
    path = url.path
    if not(os.path.exists(path)):
        logger.debug("Creating local directory " + path)
        try:
            os.makedirs(path, 0755)
        except os.error, err:
            # if dir already exists, ignore the error
            if not(os.path.isdir(path)):
                raise RuntimeError(err)


def scp(url):
    """
    creates a directory using ssh
    """
    cmd = "/usr/bin/ssh"
    if "SSH_PRIVATE_KEY" in os.environ:
        cmd += " -i " + os.environ['SSH_PRIVATE_KEY']
    cmd += " -o PasswordAuthentication=no"
    cmd += " -o StrictHostKeyChecking=no"
    cmd += " " + url.host
    cmd += " '/bin/mkdir -p " + url.path + "'"
    myexec(cmd, 60, True)


def gsiftp(url):
    """
    create directories on gridftp servers
    """
 
    if tool_info['globus-url-copy']['full_path'] == None:
        raise RuntimeError("Unable to do gsiftp mkdir becuase globus-url-copy could not be found")
   
    # build command line for globus-url-copy
    cmd = tool_info['globus-url-copy']['full_path']

    # make output from guc match our current log level
    if logger.isEnabledFor(logging.DEBUG):
        cmd += " -dbg"

    cmd += " -create-dest"
    cmd += " -no-third-party-transfers -no-data-channel-authentication"
    cmd += " file:///dev/null " + url.url() + "/.empty"

    myexec(cmd, 60, True)


def irods_login():
    """
    log in to irods by using the iinit command - if the file already exists,
    we are already logged in
    """
    f = os.environ['irodsAuthFileName']
    if os.path.exists(f):
        return
    
    # read password from env file
    if not "irodsEnvFile" in os.environ:
        raise RuntimeError("Missing irodsEnvFile - unable to do irods transfers")
    password = None
    h = open(os.environ['irodsEnvFile'], 'r')
    for line in h:
        items = line.split(" ", 2)
        if items[0].lower() == "irodspassword":
            password = items[1].strip(" \t'\"\r\n")
    h.close()
    if password == None:
        raise RuntimeError("No irodsPassword specified in irods env file")
    
    h = open(".irodsAc", "w")
    h.write(password + "\n")
    h.close()
    
    cmd = "cat .irodsAc | iinit"
    myexec(cmd, 60*60, True)
        
    os.unlink(".irodsAc")


def irods(url):
    """
    irods - use the icommands to interact with irods
    """
    if len(transfers) == 0:
        return

    if tool_info['imkdir']['full_path'] == None:
        raise RuntimeError("Unable to do irods create dir because imkdir could not be found in the current path")

    # log in to irods
    try:
        irods_login()
    except Exception, loginErr:
        logger.error(loginErr)
        raise RuntimError("Unable to log into irods")

    cmd = "imkdir -p " + os.path.dirname(url.path)
    myexec(cmd, 60, True)

            
def srm(url):
    """
    implements recursive mkdir as srm-mkdir can not handle it
    """
    
    if tool_info['srm-mkdir']['full_path'] == None:
        raise RuntimeError("Unable to do srm mkdir becuase srm-mkdir could not be found")

    # if the directory exists, just return
    cmd = "srm-ls %s >/dev/null" %(url.url())
    try:
        myexec(cmd, 60, True)
        return
    except Exception, err:
        logger.info("Directory %s does not exist yet" % (url.path))

    # back down to a directory which exists
    one_up = url.parent_url()
    if one_up.path != "/":
        srm(one_up)
            
    cmd = "srm-mkdir %s" %(url.url())

    try:
        myexec(cmd, 60, True)
    except Exception, err:
        if check_error:
            raise err
    

def s3(url):
    """
    s3 - uses pegasus-s3 to interact with Amazon S3 
    """

    if tool_info['pegasus-s3']['full_path'] == None:
        raise RuntimeError("Unable to do S3 mkdir becuase pegasus-s3 could not be found")

    # extract the bucket part
    re_bucket = re.compile(r'(s3(s){0,1}://\w+@\w+/+[\w]+)')
    bucket = url.url()
    r = re_bucket.search(bucket)
    if r:
        bucket = r.group(1)
    else:
        raise RuntimeError("Unable to parse bucket: %s" % (bucket))

    # first ensure that the bucket exists
    cmd = "pegasus-s3 mkdir %s" %(bucket)
    myexec(cmd, 60, True)


def create_dir(url):
    """
    handles the creation of a directory
    """
    try:
        if tool_map.has_key(url.proto):
            tool = tool_map[url.proto]
            if tool == "mkdir":
                mkdir(url)
            elif tool == "scp":
                scp(url)
            elif tool == "gsiftp":
                check_tool("globus-url-copy", "-version", "([0-9]+\.[0-9]+)")
                check_tool("uberftp", "-version", "([0-9]+\.[0-9]+)")
                gsiftp(url)
            elif tool == "irods":
                check_tool("imkdir", "-h", "Version[ \t]+([\.0-9a-zA-Z]+)")
                irods(url)
            elif tool == "srm":
                check_tool("srm-mkdir", "-version", "srm-mkdir[ \t]+([\.0-9a-zA-Z]+)")
                srm(url)
            elif tool == "s3":
                check_tool("pegasus-s3", "help", None)
                s3(url)
            else:
                logger.critical("Error: No mapping for the tool '%s'" %(tool))
                myexit(1)
        else:
            logger.critical("Error: This tool does not know how to create a directory for %s://" % (url.proto))
            myexit(1)

    except RuntimeError, err:
        logger.critical(err)
        myexit(1)


def myexit(rc):
    """
    system exit without a stack trace - silly python
    """
    try:
        sys.exit(rc)
    except SystemExit:
        sys.exit(rc)



# --- main ----------------------------------------------------------------------------

# dup stderr onto stdout
sys.stderr = sys.stdout

# Configure command line option parser
prog_usage = "usage: %s [options]" % (prog_base)
parser = optparse.OptionParser(usage=prog_usage)
parser.add_option("-l", "--loglevel", action = "store", dest = "log_level",
                  help = "Log level. Valid levels are: debug,info,warning,error, Default is info.")
parser.add_option("-u", "--url", action = "store", dest = "url",
                  help = "URL for the directory to create")

# Parse command line options
(options, args) = parser.parse_args()
if options.log_level == None:
    options.log_level = "info"
setup_logger(options.log_level)
if options.url == None:
    logger.critical("Please specify the URL for the directory to create")
    myexit(1)

# Die nicely when asked to (Ctrl+C, system shutdown)
signal.signal(signal.SIGINT, prog_sigint_handler)

# check environment and tools
try:
    check_env_and_tools()
except Exception, err:
    logger.critical(err)
    myexit(1)

url = URL()
url.set_url(options.url)

try:
    create_dir(url)
except Exception, err:
    logger.critical(err)
    logger.critical("Directory not created!")
    myexit(1)

logger.info("Directory created")

myexit(0)