import fcntl import hashlib import httplib2 import os import re import subprocess import errno import sys import arvados from arvados.collection import CollectionReader HEX_RE = re.compile(r'^[0-9a-fA-F]+$') keep_locator_pattern = re.compile(r'[0-9a-f]{32}\+\d+(\+\S+)*') signed_locator_pattern = re.compile(r'[0-9a-f]{32}\+\d+(\+\S+)*\+A\S+(\+\S+)*') portable_data_hash_pattern = re.compile(r'[0-9a-f]{32}\+\d+') uuid_pattern = re.compile(r'[a-z0-9]{5}-[a-z0-9]{5}-[a-z0-9]{15}') collection_uuid_pattern = re.compile(r'[a-z0-9]{5}-4zz18-[a-z0-9]{15}') group_uuid_pattern = re.compile(r'[a-z0-9]{5}-j7d0g-[a-z0-9]{15}') user_uuid_pattern = re.compile(r'[a-z0-9]{5}-tpzed-[a-z0-9]{15}') link_uuid_pattern = re.compile(r'[a-z0-9]{5}-o0j2j-[a-z0-9]{15}') manifest_pattern = re.compile(r'((\S+)( +[a-f0-9]{32}(\+\d+)(\+\S+)*)+( +\d+:\d+:\S+)+$)+', flags=re.MULTILINE) def clear_tmpdir(path=None): """ Ensure the given directory (or TASK_TMPDIR if none given) exists and is empty. """ if path is None: path = arvados.current_task().tmpdir if os.path.exists(path): p = subprocess.Popen(['rm', '-rf', path]) stdout, stderr = p.communicate(None) if p.returncode != 0: raise Exception('rm -rf %s: %s' % (path, stderr)) os.mkdir(path) def run_command(execargs, **kwargs): kwargs.setdefault('stdin', subprocess.PIPE) kwargs.setdefault('stdout', subprocess.PIPE) kwargs.setdefault('stderr', sys.stderr) kwargs.setdefault('close_fds', True) kwargs.setdefault('shell', False) p = subprocess.Popen(execargs, **kwargs) stdoutdata, stderrdata = p.communicate(None) if p.returncode != 0: raise arvados.errors.CommandFailedError( "run_command %s exit %d:\n%s" % (execargs, p.returncode, stderrdata)) return stdoutdata, stderrdata def git_checkout(url, version, path): if not re.search('^/', path): path = os.path.join(arvados.current_job().tmpdir, path) if not os.path.exists(path): run_command(["git", "clone", url, path], cwd=os.path.dirname(path)) run_command(["git", "checkout", version], cwd=path) return path def tar_extractor(path, decompress_flag): return subprocess.Popen(["tar", "-C", path, ("-x%sf" % decompress_flag), "-"], stdout=None, stdin=subprocess.PIPE, stderr=sys.stderr, shell=False, close_fds=True) def tarball_extract(tarball, path): """Retrieve a tarball from Keep and extract it to a local directory. Return the absolute path where the tarball was extracted. If the top level of the tarball contained just one file or directory, return the absolute path of that single item. tarball -- collection locator path -- where to extract the tarball: absolute, or relative to job tmp """ if not re.search('^/', path): path = os.path.join(arvados.current_job().tmpdir, path) lockfile = open(path + '.lock', 'w') fcntl.flock(lockfile, fcntl.LOCK_EX) try: os.stat(path) except OSError: os.mkdir(path) already_have_it = False try: if os.readlink(os.path.join(path, '.locator')) == tarball: already_have_it = True except OSError: pass if not already_have_it: # emulate "rm -f" (i.e., if the file does not exist, we win) try: os.unlink(os.path.join(path, '.locator')) except OSError: if os.path.exists(os.path.join(path, '.locator')): os.unlink(os.path.join(path, '.locator')) for f in CollectionReader(tarball).all_files(): if re.search('\.(tbz|tar.bz2)$', f.name()): p = tar_extractor(path, 'j') elif re.search('\.(tgz|tar.gz)$', f.name()): p = tar_extractor(path, 'z') elif re.search('\.tar$', f.name()): p = tar_extractor(path, '') else: raise arvados.errors.AssertionError( "tarball_extract cannot handle filename %s" % f.name()) while True: buf = f.read(2**20) if len(buf) == 0: break p.stdin.write(buf) p.stdin.close() p.wait() if p.returncode != 0: lockfile.close() raise arvados.errors.CommandFailedError( "tar exited %d" % p.returncode) os.symlink(tarball, os.path.join(path, '.locator')) tld_extracts = filter(lambda f: f != '.locator', os.listdir(path)) lockfile.close() if len(tld_extracts) == 1: return os.path.join(path, tld_extracts[0]) return path def zipball_extract(zipball, path): """Retrieve a zip archive from Keep and extract it to a local directory. Return the absolute path where the archive was extracted. If the top level of the archive contained just one file or directory, return the absolute path of that single item. zipball -- collection locator path -- where to extract the archive: absolute, or relative to job tmp """ if not re.search('^/', path): path = os.path.join(arvados.current_job().tmpdir, path) lockfile = open(path + '.lock', 'w') fcntl.flock(lockfile, fcntl.LOCK_EX) try: os.stat(path) except OSError: os.mkdir(path) already_have_it = False try: if os.readlink(os.path.join(path, '.locator')) == zipball: already_have_it = True except OSError: pass if not already_have_it: # emulate "rm -f" (i.e., if the file does not exist, we win) try: os.unlink(os.path.join(path, '.locator')) except OSError: if os.path.exists(os.path.join(path, '.locator')): os.unlink(os.path.join(path, '.locator')) for f in CollectionReader(zipball).all_files(): if not re.search('\.zip$', f.name()): raise arvados.errors.NotImplementedError( "zipball_extract cannot handle filename %s" % f.name()) zip_filename = os.path.join(path, os.path.basename(f.name())) zip_file = open(zip_filename, 'wb') while True: buf = f.read(2**20) if len(buf) == 0: break zip_file.write(buf) zip_file.close() p = subprocess.Popen(["unzip", "-q", "-o", "-d", path, zip_filename], stdout=None, stdin=None, stderr=sys.stderr, shell=False, close_fds=True) p.wait() if p.returncode != 0: lockfile.close() raise arvados.errors.CommandFailedError( "unzip exited %d" % p.returncode) os.unlink(zip_filename) os.symlink(zipball, os.path.join(path, '.locator')) tld_extracts = filter(lambda f: f != '.locator', os.listdir(path)) lockfile.close() if len(tld_extracts) == 1: return os.path.join(path, tld_extracts[0]) return path def collection_extract(collection, path, files=[], decompress=True): """Retrieve a collection from Keep and extract it to a local directory. Return the absolute path where the collection was extracted. collection -- collection locator path -- where to extract: absolute, or relative to job tmp """ matches = re.search(r'^([0-9a-f]+)(\+[\w@]+)*$', collection) if matches: collection_hash = matches.group(1) else: collection_hash = hashlib.md5(collection).hexdigest() if not re.search('^/', path): path = os.path.join(arvados.current_job().tmpdir, path) lockfile = open(path + '.lock', 'w') fcntl.flock(lockfile, fcntl.LOCK_EX) try: os.stat(path) except OSError: os.mkdir(path) already_have_it = False try: if os.readlink(os.path.join(path, '.locator')) == collection_hash: already_have_it = True except OSError: pass # emulate "rm -f" (i.e., if the file does not exist, we win) try: os.unlink(os.path.join(path, '.locator')) except OSError: if os.path.exists(os.path.join(path, '.locator')): os.unlink(os.path.join(path, '.locator')) files_got = [] for s in CollectionReader(collection).all_streams(): stream_name = s.name() for f in s.all_files(): if (files == [] or ((f.name() not in files_got) and (f.name() in files or (decompress and f.decompressed_name() in files)))): outname = f.decompressed_name() if decompress else f.name() files_got += [outname] if os.path.exists(os.path.join(path, stream_name, outname)): continue mkdir_dash_p(os.path.dirname(os.path.join(path, stream_name, outname))) outfile = open(os.path.join(path, stream_name, outname), 'wb') for buf in (f.readall_decompressed() if decompress else f.readall()): outfile.write(buf) outfile.close() if len(files_got) < len(files): raise arvados.errors.AssertionError( "Wanted files %s but only got %s from %s" % (files, files_got, [z.name() for z in CollectionReader(collection).all_files()])) os.symlink(collection_hash, os.path.join(path, '.locator')) lockfile.close() return path def mkdir_dash_p(path): if not os.path.isdir(path): try: os.makedirs(path) except OSError as e: if e.errno == errno.EEXIST and os.path.isdir(path): # It is not an error if someone else creates the # directory between our exists() and makedirs() calls. pass else: raise def stream_extract(stream, path, files=[], decompress=True): """Retrieve a stream from Keep and extract it to a local directory. Return the absolute path where the stream was extracted. stream -- StreamReader object path -- where to extract: absolute, or relative to job tmp """ if not re.search('^/', path): path = os.path.join(arvados.current_job().tmpdir, path) lockfile = open(path + '.lock', 'w') fcntl.flock(lockfile, fcntl.LOCK_EX) try: os.stat(path) except OSError: os.mkdir(path) files_got = [] for f in stream.all_files(): if (files == [] or ((f.name() not in files_got) and (f.name() in files or (decompress and f.decompressed_name() in files)))): outname = f.decompressed_name() if decompress else f.name() files_got += [outname] if os.path.exists(os.path.join(path, outname)): os.unlink(os.path.join(path, outname)) mkdir_dash_p(os.path.dirname(os.path.join(path, outname))) outfile = open(os.path.join(path, outname), 'wb') for buf in (f.readall_decompressed() if decompress else f.readall()): outfile.write(buf) outfile.close() if len(files_got) < len(files): raise arvados.errors.AssertionError( "Wanted files %s but only got %s from %s" % (files, files_got, [z.name() for z in stream.all_files()])) lockfile.close() return path def listdir_recursive(dirname, base=None, max_depth=None): """listdir_recursive(dirname, base, max_depth) Return a list of file and directory names found under dirname. If base is not None, prepend "{base}/" to each returned name. If max_depth is None, descend into directories and return only the names of files found in the directory tree. If max_depth is a non-negative integer, stop descending into directories at the given depth, and at that point return directory names instead. If max_depth==0 (and base is None) this is equivalent to sorted(os.listdir(dirname)). """ allfiles = [] for ent in sorted(os.listdir(dirname)): ent_path = os.path.join(dirname, ent) ent_base = os.path.join(base, ent) if base else ent if os.path.isdir(ent_path) and max_depth != 0: allfiles += listdir_recursive( ent_path, base=ent_base, max_depth=(max_depth-1 if max_depth else None)) else: allfiles += [ent_base] return allfiles def is_hex(s, *length_args): """is_hex(s[, length[, max_length]]) -> boolean Return True if s is a string of hexadecimal digits. If one length argument is given, the string must contain exactly that number of digits. If two length arguments are given, the string must contain a number of digits between those two lengths, inclusive. Return False otherwise. """ num_length_args = len(length_args) if num_length_args > 2: raise arvados.errors.ArgumentError( "is_hex accepts up to 3 arguments ({} given)".format(1 + num_length_args)) elif num_length_args == 2: good_len = (length_args[0] <= len(s) <= length_args[1]) elif num_length_args == 1: good_len = (len(s) == length_args[0]) else: good_len = True return bool(good_len and HEX_RE.match(s)) def list_all(fn, num_retries=0, **kwargs): # Default limit to (effectively) api server's MAX_LIMIT kwargs.setdefault('limit', sys.maxint) items = [] offset = 0 items_available = sys.maxint while len(items) < items_available: c = fn(offset=offset, **kwargs).execute(num_retries=num_retries) items += c['items'] items_available = c['items_available'] offset = c['offset'] + len(c['items']) return items def ca_certs_path(fallback=httplib2.CA_CERTS): """Return the path of the best available CA certs source. This function searches for various distribution sources of CA certificates, and returns the first it finds. If it doesn't find any, it returns the value of `fallback` (httplib2's CA certs by default). """ for ca_certs_path in [ # Debian: '/etc/ssl/certs/ca-certificates.crt', # Red Hat: '/etc/pki/tls/certs/ca-bundle.crt', ]: if os.path.exists(ca_certs_path): return ca_certs_path return fallback