import pwd
import sys
import socket
+import errno
+import itertools
+import signal
+import httplib
+import urllib
+import time
+import logging
+import random
+import string
import wizard
self.olddir = None
def __enter__(self):
self.olddir = os.getcwd()
- os.chdir(self.dir)
+ chdir(self.dir)
def __exit__(self, *args):
- os.chdir(self.olddir)
+ chdir(self.olddir)
class Counter(object):
"""
return self.dict[key]
def __iter__(self):
return self.dict.__iter__()
+ def max(self):
+ """Returns the max counter value seen."""
+ return max(self.dict.values())
+ def sum(self):
+ """Returns the sum of all counter values."""
+ return sum(self.dict.values())
+ def keys(self):
+ """Returns the keys of counters."""
+ return self.dict.keys()
+
+class PipeToLess(object):
+ """
+ Context for printing output to a pager. Use this if output
+ is expected to be long.
+ """
+ def __enter__(self):
+ self.proc = subprocess.Popen("less", stdin=subprocess.PIPE)
+ self.old_stdout = sys.stdout
+ sys.stdout = self.proc.stdin
+ def __exit__(self, *args):
+ if self.proc:
+ self.proc.stdin.close()
+ self.proc.wait()
+ sys.stdout = self.old_stdout
+
+class IgnoreKeyboardInterrupts(object):
+ """
+ Context for temporarily ignoring keyboard interrupts. Use this
+ if aborting would cause more harm than finishing the job.
+ """
+ def __enter__(self):
+ signal.signal(signal.SIGINT,signal.SIG_IGN)
+ def __exit__(self, *args):
+ signal.signal(signal.SIGINT, signal.default_int_handler)
+
+class LockDirectory(object):
+ """
+ Context for locking a directory.
+ """
+ def __init__(self, lockfile, expiry = 3600):
+ self.lockfile = lockfile
+ self.expiry = expiry # by default an hour
+ def __enter__(self):
+ # It's A WAVY
+ for i in range(0, 3):
+ try:
+ os.open(self.lockfile, os.O_CREAT | os.O_EXCL)
+ open(self.lockfile, "w").write("%d" % os.getpid())
+ except OSError as e:
+ if e.errno == errno.EEXIST:
+ # There is a possibility of infinite recursion, but we
+ # expect it to be unlikely, and not harmful if it does happen
+ with LockDirectory(self.lockfile + "_"):
+ # See if we can break the lock
+ try:
+ pid = open(self.lockfile, "r").read().strip()
+ if not os.path.exists("/proc/%s" % pid):
+ # break the lock, try again
+ logging.warning("Breaking orphaned lock at %s", self.lockfile)
+ os.unlink(self.lockfile)
+ continue
+ try:
+ # check if the file is expiry old, if so, break the lock, try again
+ if time.time() - os.stat(self.lockfile).st_mtime > self.expiry:
+ logging.warning("Breaking stale lock at %s", self.lockfile)
+ os.unlink(self.lockfile)
+ continue
+ except OSError as e:
+ if e.errno == errno.ENOENT:
+ continue
+ raise
+ except IOError:
+ # oh hey, it went away; try again
+ continue
+ raise DirectoryLockedError(os.getcwd())
+ elif e.errno == errno.EACCES:
+ raise PermissionsError(os.getcwd())
+ raise
+ return
+ raise DirectoryLockedError(os.getcwd())
+ def __exit__(self, *args):
+ try:
+ os.unlink(self.lockfile)
+ except OSError:
+ pass
+
+def chdir(dir):
+ """
+ Changes a directory, but has special exceptions for certain
+ classes of errors.
+ """
+ try:
+ os.chdir(dir)
+ except OSError as e:
+ if e.errno == errno.EACCES:
+ raise PermissionsError()
+ elif e.errno == errno.ENOENT:
+ raise NoSuchDirectoryError()
+ else: raise e
def dictmap(f, d):
"""
"""
return dict((k,f(v)) for k,v in d.items())
+def dictkmap(f, d):
+ """
+ A map function for dictionaries that passes key and value.
+
+ >>> dictkmap(lambda x, y: x + y, {1: 4, 3: 4})
+ {1: 5, 3: 7}
+ """
+ return dict((k,f(k,v)) for k,v in d.items())
+
def get_exception_name(output):
"""
Reads the traceback from a Python program and grabs the
fully qualified exception name.
"""
lines = output.split("\n")
- for line in lines[1:]: # skip the "traceback" line
+ cue = False
+ result = "(unknown)"
+ for line in lines[1:]:
line = line.rstrip()
- if line[0] == ' ': continue
- if line[-1] == ":":
- return line[:-1]
- else:
- return line
+ if not line: continue
+ if line[0] == ' ':
+ cue = True
+ continue
+ if cue:
+ cue = False
+ return line.partition(':')[0]
+ return result
def get_dir_uid(dir):
"""Finds the uid of the person who owns this directory."""
only works on scripts servers when querying directories
that live on AFS.
"""
- pwentry = pwd.getpwuid(get_dir_uid(dir))
- # XXX: Error handling!
- return pwentry.pw_name
+ uid = get_dir_uid(dir)
+ try:
+ pwentry = pwd.getpwuid(uid)
+ return pwentry.pw_name
+ except KeyError:
+ # do an pts query to get the name
+ return subprocess.Popen(['pts', 'examine', str(uid)], stdout=subprocess.PIPE).communicate()[0].partition(",")[0].partition(": ")[2]
def get_revision():
"""Returns the commit ID of the current Wizard install."""
+ # If you decide to convert this to use wizard.shell, be warned
+ # that there is a circular dependency, so this function would
+ # probably have to live somewhere else, probably wizard.git
wizard_git = os.path.join(os.path.dirname(os.path.dirname(os.path.abspath(__file__))), ".git")
return subprocess.Popen(["git", "--git-dir=" + wizard_git, "rev-parse", "HEAD"], stdout=subprocess.PIPE).communicate()[0].rstrip()
,"Wizard-args: %s" % " ".join(sys.argv)
])
+def safe_unlink(file):
+ """Moves a file/dir to a backup location."""
+ if not os.path.exists(file):
+ return None
+ prefix = "%s.bak" % file
+ name = None
+ for i in itertools.count():
+ name = "%s.%d" % (prefix, i)
+ if not os.path.exists(name):
+ break
+ os.rename(file, name)
+ return name
+
+def soft_unlink(file):
+ """Unlink a file, but don't complain if it doesn't exist."""
+ try:
+ os.unlink(file)
+ except OSError:
+ pass
+
+def fetch(host, path, subpath, post=None):
+ try:
+ # XXX: Special case if it's https; not sure why this data isn't
+ # passed
+ h = httplib.HTTPConnection(host)
+ fullpath = path.rstrip("/") + "/" + subpath.lstrip("/") # to be lenient about input we accept
+ if post:
+ headers = {"Content-type": "application/x-www-form-urlencoded"}
+ h.request("POST", fullpath, urllib.urlencode(post), headers)
+ else:
+ h.request("GET", fullpath)
+ r = h.getresponse()
+ data = r.read()
+ h.close()
+ return data
+ except socket.gaierror as e:
+ if e.errno == socket.EAI_NONAME:
+ raise DNSError(host)
+ else:
+ raise
+
+def mixed_newlines(filename):
+ """Returns ``True`` if ``filename`` has mixed newlines."""
+ f = open(filename, "U") # requires universal newline support
+ f.read()
+ ret = isinstance(f.newlines, tuple)
+ f.close() # just to be safe
+ return ret
+
+def random_key(length=30):
+ """Generates a random alphanumeric key of ``length`` size."""
+ return ''.join(random.choice(string.letters + string.digits) for i in xrange(length))
+
class NoOperatorInfo(wizard.Error):
"""No information could be found about the operator from Kerberos."""
pass
+class PermissionsError(IOError):
+ errno = errno.EACCES
+
+class NoSuchDirectoryError(IOError):
+ errno = errno.ENOENT
+
+class DirectoryLockedError(wizard.Error):
+ def __init__(self, dir):
+ self.dir = dir
+ def __str__(self):
+ return """
+
+ERROR: Could not acquire lock on directory. Maybe there is
+another migration process running?
+"""
+
+class DNSError(socket.gaierror):
+ errno = socket.EAI_NONAME
+ #: Hostname that could not resolve name
+ host = None
+ def __init__(self, host):
+ self.host = host
+ def __str__(self):
+ return """
+
+ERROR: Could not resolve hostname %s.
+""" % self.host
scripts.mit.edu / wizard.git / blobdiff