ref: ce9d09a9650d2903d0dca659669cce14d68bd95b
dir: /sys/lib/python/mercurial/util.py/
# util.py - Mercurial utility functions and platform specfic implementations
#
# Copyright 2005 K. Thananchayan <[email protected]>
# Copyright 2005-2007 Matt Mackall <[email protected]>
# Copyright 2006 Vadim Gelfer <[email protected]>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2, incorporated herein by reference.
"""Mercurial utility functions and platform specfic implementations.
This contains helper routines that are independent of the SCM core and
hide platform-specific details from the core.
"""
from i18n import _
import error, osutil
import cStringIO, errno, re, shutil, sys, tempfile, traceback
import os, stat, time, calendar, random, textwrap
import imp
# Python compatibility
def sha1(s):
return _fastsha1(s)
def _fastsha1(s):
# This function will import sha1 from hashlib or sha (whichever is
# available) and overwrite itself with it on the first call.
# Subsequent calls will go directly to the imported function.
try:
from hashlib import sha1 as _sha1
except ImportError:
from sha import sha as _sha1
global _fastsha1, sha1
_fastsha1 = sha1 = _sha1
return _sha1(s)
import subprocess
closefds = os.name == 'posix'
def popen2(cmd):
# Setting bufsize to -1 lets the system decide the buffer size.
# The default for bufsize is 0, meaning unbuffered. This leads to
# poor performance on Mac OS X: http://bugs.python.org/issue4194
p = subprocess.Popen(cmd, shell=True, bufsize=-1,
close_fds=closefds,
stdin=subprocess.PIPE, stdout=subprocess.PIPE)
return p.stdin, p.stdout
def popen3(cmd):
p = subprocess.Popen(cmd, shell=True, bufsize=-1,
close_fds=closefds,
stdin=subprocess.PIPE, stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
return p.stdin, p.stdout, p.stderr
def version():
"""Return version information if available."""
try:
import __version__
return __version__.version
except ImportError:
return 'unknown'
# used by parsedate
defaultdateformats = (
'%Y-%m-%d %H:%M:%S',
'%Y-%m-%d %I:%M:%S%p',
'%Y-%m-%d %H:%M',
'%Y-%m-%d %I:%M%p',
'%Y-%m-%d',
'%m-%d',
'%m/%d',
'%m/%d/%y',
'%m/%d/%Y',
'%a %b %d %H:%M:%S %Y',
'%a %b %d %I:%M:%S%p %Y',
'%a, %d %b %Y %H:%M:%S', # GNU coreutils "/bin/date --rfc-2822"
'%b %d %H:%M:%S %Y',
'%b %d %I:%M:%S%p %Y',
'%b %d %H:%M:%S',
'%b %d %I:%M:%S%p',
'%b %d %H:%M',
'%b %d %I:%M%p',
'%b %d %Y',
'%b %d',
'%H:%M:%S',
'%I:%M:%SP',
'%H:%M',
'%I:%M%p',
)
extendeddateformats = defaultdateformats + (
"%Y",
"%Y-%m",
"%b",
"%b %Y",
)
def cachefunc(func):
'''cache the result of function calls'''
# XXX doesn't handle keywords args
cache = {}
if func.func_code.co_argcount == 1:
# we gain a small amount of time because
# we don't need to pack/unpack the list
def f(arg):
if arg not in cache:
cache[arg] = func(arg)
return cache[arg]
else:
def f(*args):
if args not in cache:
cache[args] = func(*args)
return cache[args]
return f
def lrucachefunc(func):
'''cache most recent results of function calls'''
cache = {}
order = []
if func.func_code.co_argcount == 1:
def f(arg):
if arg not in cache:
if len(cache) > 20:
del cache[order.pop(0)]
cache[arg] = func(arg)
else:
order.remove(arg)
order.append(arg)
return cache[arg]
else:
def f(*args):
if args not in cache:
if len(cache) > 20:
del cache[order.pop(0)]
cache[args] = func(*args)
else:
order.remove(args)
order.append(args)
return cache[args]
return f
class propertycache(object):
def __init__(self, func):
self.func = func
self.name = func.__name__
def __get__(self, obj, type=None):
result = self.func(obj)
setattr(obj, self.name, result)
return result
def pipefilter(s, cmd):
'''filter string S through command CMD, returning its output'''
p = subprocess.Popen(cmd, shell=True, close_fds=closefds,
stdin=subprocess.PIPE, stdout=subprocess.PIPE)
pout, perr = p.communicate(s)
return pout
def tempfilter(s, cmd):
'''filter string S through a pair of temporary files with CMD.
CMD is used as a template to create the real command to be run,
with the strings INFILE and OUTFILE replaced by the real names of
the temporary files generated.'''
inname, outname = None, None
try:
infd, inname = tempfile.mkstemp(prefix='hg-filter-in-')
fp = os.fdopen(infd, 'wb')
fp.write(s)
fp.close()
outfd, outname = tempfile.mkstemp(prefix='hg-filter-out-')
os.close(outfd)
cmd = cmd.replace('INFILE', inname)
cmd = cmd.replace('OUTFILE', outname)
code = os.system(cmd)
if sys.platform == 'OpenVMS' and code & 1:
code = 0
if code: raise Abort(_("command '%s' failed: %s") %
(cmd, explain_exit(code)))
return open(outname, 'rb').read()
finally:
try:
if inname: os.unlink(inname)
except: pass
try:
if outname: os.unlink(outname)
except: pass
filtertable = {
'tempfile:': tempfilter,
'pipe:': pipefilter,
}
def filter(s, cmd):
"filter a string through a command that transforms its input to its output"
for name, fn in filtertable.iteritems():
if cmd.startswith(name):
return fn(s, cmd[len(name):].lstrip())
return pipefilter(s, cmd)
def binary(s):
"""return true if a string is binary data"""
return bool(s and '\0' in s)
def increasingchunks(source, min=1024, max=65536):
'''return no less than min bytes per chunk while data remains,
doubling min after each chunk until it reaches max'''
def log2(x):
if not x:
return 0
i = 0
while x:
x >>= 1
i += 1
return i - 1
buf = []
blen = 0
for chunk in source:
buf.append(chunk)
blen += len(chunk)
if blen >= min:
if min < max:
min = min << 1
nmin = 1 << log2(blen)
if nmin > min:
min = nmin
if min > max:
min = max
yield ''.join(buf)
blen = 0
buf = []
if buf:
yield ''.join(buf)
Abort = error.Abort
def always(fn): return True
def never(fn): return False
def pathto(root, n1, n2):
'''return the relative path from one place to another.
root should use os.sep to separate directories
n1 should use os.sep to separate directories
n2 should use "/" to separate directories
returns an os.sep-separated path.
If n1 is a relative path, it's assumed it's
relative to root.
n2 should always be relative to root.
'''
if not n1: return localpath(n2)
if os.path.isabs(n1):
if os.path.splitdrive(root)[0] != os.path.splitdrive(n1)[0]:
return os.path.join(root, localpath(n2))
n2 = '/'.join((pconvert(root), n2))
a, b = splitpath(n1), n2.split('/')
a.reverse()
b.reverse()
while a and b and a[-1] == b[-1]:
a.pop()
b.pop()
b.reverse()
return os.sep.join((['..'] * len(a)) + b) or '.'
def canonpath(root, cwd, myname):
"""return the canonical path of myname, given cwd and root"""
if root == os.sep:
rootsep = os.sep
elif endswithsep(root):
rootsep = root
else:
rootsep = root + os.sep
name = myname
if not os.path.isabs(name):
name = os.path.join(root, cwd, name)
name = os.path.normpath(name)
audit_path = path_auditor(root)
if name != rootsep and name.startswith(rootsep):
name = name[len(rootsep):]
audit_path(name)
return pconvert(name)
elif name == root:
return ''
else:
# Determine whether `name' is in the hierarchy at or beneath `root',
# by iterating name=dirname(name) until that causes no change (can't
# check name == '/', because that doesn't work on windows). For each
# `name', compare dev/inode numbers. If they match, the list `rel'
# holds the reversed list of components making up the relative file
# name we want.
root_st = os.stat(root)
rel = []
while True:
try:
name_st = os.stat(name)
except OSError:
break
if samestat(name_st, root_st):
if not rel:
# name was actually the same as root (maybe a symlink)
return ''
rel.reverse()
name = os.path.join(*rel)
audit_path(name)
return pconvert(name)
dirname, basename = os.path.split(name)
rel.append(basename)
if dirname == name:
break
name = dirname
raise Abort('%s not under root' % myname)
_hgexecutable = None
def main_is_frozen():
"""return True if we are a frozen executable.
The code supports py2exe (most common, Windows only) and tools/freeze
(portable, not much used).
"""
return (hasattr(sys, "frozen") or # new py2exe
hasattr(sys, "importers") or # old py2exe
imp.is_frozen("__main__")) # tools/freeze
def hgexecutable():
"""return location of the 'hg' executable.
Defaults to $HG or 'hg' in the search path.
"""
if _hgexecutable is None:
hg = os.environ.get('HG')
if hg:
set_hgexecutable(hg)
elif main_is_frozen():
set_hgexecutable(sys.executable)
else:
set_hgexecutable(find_exe('hg') or 'hg')
return _hgexecutable
def set_hgexecutable(path):
"""set location of the 'hg' executable"""
global _hgexecutable
_hgexecutable = path
def system(cmd, environ={}, cwd=None, onerr=None, errprefix=None):
'''enhanced shell command execution.
run with environment maybe modified, maybe in different dir.
if command fails and onerr is None, return status. if ui object,
print error message and return status, else raise onerr object as
exception.'''
def py2shell(val):
'convert python object into string that is useful to shell'
if val is None or val is False:
return '0'
if val is True:
return '1'
return str(val)
oldenv = {}
for k in environ:
oldenv[k] = os.environ.get(k)
if cwd is not None:
oldcwd = os.getcwd()
origcmd = cmd
if os.name == 'nt':
cmd = '"%s"' % cmd
try:
for k, v in environ.iteritems():
os.environ[k] = py2shell(v)
os.environ['HG'] = hgexecutable()
if cwd is not None and oldcwd != cwd:
os.chdir(cwd)
rc = os.system(cmd)
if sys.platform == 'OpenVMS' and rc & 1:
rc = 0
if rc and onerr:
errmsg = '%s %s' % (os.path.basename(origcmd.split(None, 1)[0]),
explain_exit(rc)[0])
if errprefix:
errmsg = '%s: %s' % (errprefix, errmsg)
try:
onerr.warn(errmsg + '\n')
except AttributeError:
raise onerr(errmsg)
return rc
finally:
for k, v in oldenv.iteritems():
if v is None:
del os.environ[k]
else:
os.environ[k] = v
if cwd is not None and oldcwd != cwd:
os.chdir(oldcwd)
def checksignature(func):
'''wrap a function with code to check for calling errors'''
def check(*args, **kwargs):
try:
return func(*args, **kwargs)
except TypeError:
if len(traceback.extract_tb(sys.exc_info()[2])) == 1:
raise error.SignatureError
raise
return check
# os.path.lexists is not available on python2.3
def lexists(filename):
"test whether a file with this name exists. does not follow symlinks"
try:
os.lstat(filename)
except:
return False
return True
def rename(src, dst):
"""forcibly rename a file"""
try:
os.rename(src, dst)
except OSError, err: # FIXME: check err (EEXIST ?)
# On windows, rename to existing file is not allowed, so we
# must delete destination first. But if a file is open, unlink
# schedules it for delete but does not delete it. Rename
# happens immediately even for open files, so we rename
# destination to a temporary name, then delete that. Then
# rename is safe to do.
# The temporary name is chosen at random to avoid the situation
# where a file is left lying around from a previous aborted run.
# The usual race condition this introduces can't be avoided as
# we need the name to rename into, and not the file itself. Due
# to the nature of the operation however, any races will at worst
# lead to the rename failing and the current operation aborting.
def tempname(prefix):
for tries in xrange(10):
temp = '%s-%08x' % (prefix, random.randint(0, 0xffffffff))
if not os.path.exists(temp):
return temp
raise IOError, (errno.EEXIST, "No usable temporary filename found")
temp = tempname(dst)
os.rename(dst, temp)
os.unlink(temp)
os.rename(src, dst)
def unlink(f):
"""unlink and remove the directory if it is empty"""
os.unlink(f)
# try removing directories that might now be empty
try:
os.removedirs(os.path.dirname(f))
except OSError:
pass
def copyfile(src, dest):
"copy a file, preserving mode and atime/mtime"
if os.path.islink(src):
try:
os.unlink(dest)
except:
pass
os.symlink(os.readlink(src), dest)
else:
try:
shutil.copyfile(src, dest)
shutil.copystat(src, dest)
except shutil.Error, inst:
raise Abort(str(inst))
def copyfiles(src, dst, hardlink=None):
"""Copy a directory tree using hardlinks if possible"""
if hardlink is None:
hardlink = (os.stat(src).st_dev ==
os.stat(os.path.dirname(dst)).st_dev)
if os.path.isdir(src):
os.mkdir(dst)
for name, kind in osutil.listdir(src):
srcname = os.path.join(src, name)
dstname = os.path.join(dst, name)
copyfiles(srcname, dstname, hardlink)
else:
if hardlink:
try:
os_link(src, dst)
except (IOError, OSError):
hardlink = False
shutil.copy(src, dst)
else:
shutil.copy(src, dst)
class path_auditor(object):
'''ensure that a filesystem path contains no banned components.
the following properties of a path are checked:
- under top-level .hg
- starts at the root of a windows drive
- contains ".."
- traverses a symlink (e.g. a/symlink_here/b)
- inside a nested repository'''
def __init__(self, root):
self.audited = set()
self.auditeddir = set()
self.root = root
def __call__(self, path):
if path in self.audited:
return
normpath = os.path.normcase(path)
parts = splitpath(normpath)
if (os.path.splitdrive(path)[0]
or parts[0].lower() in ('.hg', '.hg.', '')
or os.pardir in parts):
raise Abort(_("path contains illegal component: %s") % path)
if '.hg' in path.lower():
lparts = [p.lower() for p in parts]
for p in '.hg', '.hg.':
if p in lparts[1:]:
pos = lparts.index(p)
base = os.path.join(*parts[:pos])
raise Abort(_('path %r is inside repo %r') % (path, base))
def check(prefix):
curpath = os.path.join(self.root, prefix)
try:
st = os.lstat(curpath)
except OSError, err:
# EINVAL can be raised as invalid path syntax under win32.
# They must be ignored for patterns can be checked too.
if err.errno not in (errno.ENOENT, errno.ENOTDIR, errno.EINVAL):
raise
else:
if stat.S_ISLNK(st.st_mode):
raise Abort(_('path %r traverses symbolic link %r') %
(path, prefix))
elif (stat.S_ISDIR(st.st_mode) and
os.path.isdir(os.path.join(curpath, '.hg'))):
raise Abort(_('path %r is inside repo %r') %
(path, prefix))
parts.pop()
prefixes = []
while parts:
prefix = os.sep.join(parts)
if prefix in self.auditeddir:
break
check(prefix)
prefixes.append(prefix)
parts.pop()
self.audited.add(path)
# only add prefixes to the cache after checking everything: we don't
# want to add "foo/bar/baz" before checking if there's a "foo/.hg"
self.auditeddir.update(prefixes)
def nlinks(pathname):
"""Return number of hardlinks for the given file."""
return os.lstat(pathname).st_nlink
if hasattr(os, 'link'):
os_link = os.link
else:
def os_link(src, dst):
raise OSError(0, _("Hardlinks not supported"))
def lookup_reg(key, name=None, scope=None):
return None
if os.name == 'nt':
from windows import *
else:
from posix import *
def makelock(info, pathname):
try:
return os.symlink(info, pathname)
except OSError, why:
if why.errno == errno.EEXIST:
raise
except AttributeError: # no symlink in os
pass
ld = os.open(pathname, os.O_CREAT | os.O_WRONLY | os.O_EXCL)
os.write(ld, info)
os.close(ld)
def readlock(pathname):
try:
return os.readlink(pathname)
except OSError, why:
if why.errno not in (errno.EINVAL, errno.ENOSYS):
raise
except AttributeError: # no symlink in os
pass
return posixfile(pathname).read()
def fstat(fp):
'''stat file object that may not have fileno method.'''
try:
return os.fstat(fp.fileno())
except AttributeError:
return os.stat(fp.name)
# File system features
def checkcase(path):
"""
Check whether the given path is on a case-sensitive filesystem
Requires a path (like /foo/.hg) ending with a foldable final
directory component.
"""
s1 = os.stat(path)
d, b = os.path.split(path)
p2 = os.path.join(d, b.upper())
if path == p2:
p2 = os.path.join(d, b.lower())
try:
s2 = os.stat(p2)
if s2 == s1:
return False
return True
except:
return True
_fspathcache = {}
def fspath(name, root):
'''Get name in the case stored in the filesystem
The name is either relative to root, or it is an absolute path starting
with root. Note that this function is unnecessary, and should not be
called, for case-sensitive filesystems (simply because it's expensive).
'''
# If name is absolute, make it relative
if name.lower().startswith(root.lower()):
l = len(root)
if name[l] == os.sep or name[l] == os.altsep:
l = l + 1
name = name[l:]
if not os.path.exists(os.path.join(root, name)):
return None
seps = os.sep
if os.altsep:
seps = seps + os.altsep
# Protect backslashes. This gets silly very quickly.
seps.replace('\\','\\\\')
pattern = re.compile(r'([^%s]+)|([%s]+)' % (seps, seps))
dir = os.path.normcase(os.path.normpath(root))
result = []
for part, sep in pattern.findall(name):
if sep:
result.append(sep)
continue
if dir not in _fspathcache:
_fspathcache[dir] = os.listdir(dir)
contents = _fspathcache[dir]
lpart = part.lower()
for n in contents:
if n.lower() == lpart:
result.append(n)
break
else:
# Cannot happen, as the file exists!
result.append(part)
dir = os.path.join(dir, lpart)
return ''.join(result)
def checkexec(path):
"""
Check whether the given path is on a filesystem with UNIX-like exec flags
Requires a directory (like /foo/.hg)
"""
# VFAT on some Linux versions can flip mode but it doesn't persist
# a FS remount. Frequently we can detect it if files are created
# with exec bit on.
try:
EXECFLAGS = stat.S_IXUSR | stat.S_IXGRP | stat.S_IXOTH
fh, fn = tempfile.mkstemp("", "", path)
try:
os.close(fh)
m = os.stat(fn).st_mode & 0777
new_file_has_exec = m & EXECFLAGS
os.chmod(fn, m ^ EXECFLAGS)
exec_flags_cannot_flip = ((os.stat(fn).st_mode & 0777) == m)
finally:
os.unlink(fn)
except (IOError, OSError):
# we don't care, the user probably won't be able to commit anyway
return False
return not (new_file_has_exec or exec_flags_cannot_flip)
def checklink(path):
"""check whether the given path is on a symlink-capable filesystem"""
# mktemp is not racy because symlink creation will fail if the
# file already exists
name = tempfile.mktemp(dir=path)
try:
os.symlink(".", name)
os.unlink(name)
return True
except (OSError, AttributeError):
return False
def needbinarypatch():
"""return True if patches should be applied in binary mode by default."""
return os.name == 'nt'
def endswithsep(path):
'''Check path ends with os.sep or os.altsep.'''
return path.endswith(os.sep) or os.altsep and path.endswith(os.altsep)
def splitpath(path):
'''Split path by os.sep.
Note that this function does not use os.altsep because this is
an alternative of simple "xxx.split(os.sep)".
It is recommended to use os.path.normpath() before using this
function if need.'''
return path.split(os.sep)
def gui():
'''Are we running in a GUI?'''
return os.name == "nt" or os.name == "mac" or os.environ.get("DISPLAY")
def mktempcopy(name, emptyok=False, createmode=None):
"""Create a temporary file with the same contents from name
The permission bits are copied from the original file.
If the temporary file is going to be truncated immediately, you
can use emptyok=True as an optimization.
Returns the name of the temporary file.
"""
d, fn = os.path.split(name)
fd, temp = tempfile.mkstemp(prefix='.%s-' % fn, dir=d)
os.close(fd)
# Temporary files are created with mode 0600, which is usually not
# what we want. If the original file already exists, just copy
# its mode. Otherwise, manually obey umask.
try:
st_mode = os.lstat(name).st_mode & 0777
except OSError, inst:
if inst.errno != errno.ENOENT:
raise
st_mode = createmode
if st_mode is None:
st_mode = ~umask
st_mode &= 0666
os.chmod(temp, st_mode)
if emptyok:
return temp
try:
try:
ifp = posixfile(name, "rb")
except IOError, inst:
if inst.errno == errno.ENOENT:
return temp
if not getattr(inst, 'filename', None):
inst.filename = name
raise
ofp = posixfile(temp, "wb")
for chunk in filechunkiter(ifp):
ofp.write(chunk)
ifp.close()
ofp.close()
except:
try: os.unlink(temp)
except: pass
raise
return temp
class atomictempfile(object):
"""file-like object that atomically updates a file
All writes will be redirected to a temporary copy of the original
file. When rename is called, the copy is renamed to the original
name, making the changes visible.
"""
def __init__(self, name, mode, createmode):
self.__name = name
self._fp = None
self.temp = mktempcopy(name, emptyok=('w' in mode),
createmode=createmode)
self._fp = posixfile(self.temp, mode)
def __getattr__(self, name):
return getattr(self._fp, name)
def rename(self):
if not self._fp.closed:
self._fp.close()
rename(self.temp, localpath(self.__name))
def __del__(self):
if not self._fp:
return
if not self._fp.closed:
try:
os.unlink(self.temp)
except: pass
self._fp.close()
def makedirs(name, mode=None):
"""recursive directory creation with parent mode inheritance"""
try:
os.mkdir(name)
if mode is not None:
os.chmod(name, mode)
return
except OSError, err:
if err.errno == errno.EEXIST:
return
if err.errno != errno.ENOENT:
raise
parent = os.path.abspath(os.path.dirname(name))
makedirs(parent, mode)
makedirs(name, mode)
class opener(object):
"""Open files relative to a base directory
This class is used to hide the details of COW semantics and
remote file access from higher level code.
"""
def __init__(self, base, audit=True):
self.base = base
if audit:
self.audit_path = path_auditor(base)
else:
self.audit_path = always
self.createmode = None
@propertycache
def _can_symlink(self):
return checklink(self.base)
def _fixfilemode(self, name):
if self.createmode is None:
return
os.chmod(name, self.createmode & 0666)
def __call__(self, path, mode="r", text=False, atomictemp=False):
self.audit_path(path)
f = os.path.join(self.base, path)
if not text and "b" not in mode:
mode += "b" # for that other OS
nlink = -1
if mode not in ("r", "rb"):
try:
nlink = nlinks(f)
except OSError:
nlink = 0
d = os.path.dirname(f)
if not os.path.isdir(d):
makedirs(d, self.createmode)
if atomictemp:
return atomictempfile(f, mode, self.createmode)
if nlink > 1:
rename(mktempcopy(f), f)
fp = posixfile(f, mode)
if nlink == 0:
self._fixfilemode(f)
return fp
def symlink(self, src, dst):
self.audit_path(dst)
linkname = os.path.join(self.base, dst)
try:
os.unlink(linkname)
except OSError:
pass
dirname = os.path.dirname(linkname)
if not os.path.exists(dirname):
makedirs(dirname, self.createmode)
if self._can_symlink:
try:
os.symlink(src, linkname)
except OSError, err:
raise OSError(err.errno, _('could not symlink to %r: %s') %
(src, err.strerror), linkname)
else:
f = self(dst, "w")
f.write(src)
f.close()
self._fixfilemode(dst)
class chunkbuffer(object):
"""Allow arbitrary sized chunks of data to be efficiently read from an
iterator over chunks of arbitrary size."""
def __init__(self, in_iter):
"""in_iter is the iterator that's iterating over the input chunks.
targetsize is how big a buffer to try to maintain."""
self.iter = iter(in_iter)
self.buf = ''
self.targetsize = 2**16
def read(self, l):
"""Read L bytes of data from the iterator of chunks of data.
Returns less than L bytes if the iterator runs dry."""
if l > len(self.buf) and self.iter:
# Clamp to a multiple of self.targetsize
targetsize = max(l, self.targetsize)
collector = cStringIO.StringIO()
collector.write(self.buf)
collected = len(self.buf)
for chunk in self.iter:
collector.write(chunk)
collected += len(chunk)
if collected >= targetsize:
break
if collected < targetsize:
self.iter = False
self.buf = collector.getvalue()
if len(self.buf) == l:
s, self.buf = str(self.buf), ''
else:
s, self.buf = self.buf[:l], buffer(self.buf, l)
return s
def filechunkiter(f, size=65536, limit=None):
"""Create a generator that produces the data in the file size
(default 65536) bytes at a time, up to optional limit (default is
to read all data). Chunks may be less than size bytes if the
chunk is the last chunk in the file, or the file is a socket or
some other type of file that sometimes reads less data than is
requested."""
assert size >= 0
assert limit is None or limit >= 0
while True:
if limit is None: nbytes = size
else: nbytes = min(limit, size)
s = nbytes and f.read(nbytes)
if not s: break
if limit: limit -= len(s)
yield s
def makedate():
lt = time.localtime()
if lt[8] == 1 and time.daylight:
tz = time.altzone
else:
tz = time.timezone
return time.mktime(lt), tz
def datestr(date=None, format='%a %b %d %H:%M:%S %Y %1%2'):
"""represent a (unixtime, offset) tuple as a localized time.
unixtime is seconds since the epoch, and offset is the time zone's
number of seconds away from UTC. if timezone is false, do not
append time zone to string."""
t, tz = date or makedate()
if "%1" in format or "%2" in format:
sign = (tz > 0) and "-" or "+"
minutes = abs(tz) // 60
format = format.replace("%1", "%c%02d" % (sign, minutes // 60))
format = format.replace("%2", "%02d" % (minutes % 60))
s = time.strftime(format, time.gmtime(float(t) - tz))
return s
def shortdate(date=None):
"""turn (timestamp, tzoff) tuple into iso 8631 date."""
return datestr(date, format='%Y-%m-%d')
def strdate(string, format, defaults=[]):
"""parse a localized time string and return a (unixtime, offset) tuple.
if the string cannot be parsed, ValueError is raised."""
def timezone(string):
tz = string.split()[-1]
if tz[0] in "+-" and len(tz) == 5 and tz[1:].isdigit():
sign = (tz[0] == "+") and 1 or -1
hours = int(tz[1:3])
minutes = int(tz[3:5])
return -sign * (hours * 60 + minutes) * 60
if tz == "GMT" or tz == "UTC":
return 0
return None
# NOTE: unixtime = localunixtime + offset
offset, date = timezone(string), string
if offset != None:
date = " ".join(string.split()[:-1])
# add missing elements from defaults
for part in defaults:
found = [True for p in part if ("%"+p) in format]
if not found:
date += "@" + defaults[part]
format += "@%" + part[0]
timetuple = time.strptime(date, format)
localunixtime = int(calendar.timegm(timetuple))
if offset is None:
# local timezone
unixtime = int(time.mktime(timetuple))
offset = unixtime - localunixtime
else:
unixtime = localunixtime + offset
return unixtime, offset
def parsedate(date, formats=None, defaults=None):
"""parse a localized date/time string and return a (unixtime, offset) tuple.
The date may be a "unixtime offset" string or in one of the specified
formats. If the date already is a (unixtime, offset) tuple, it is returned.
"""
if not date:
return 0, 0
if isinstance(date, tuple) and len(date) == 2:
return date
if not formats:
formats = defaultdateformats
date = date.strip()
try:
when, offset = map(int, date.split(' '))
except ValueError:
# fill out defaults
if not defaults:
defaults = {}
now = makedate()
for part in "d mb yY HI M S".split():
if part not in defaults:
if part[0] in "HMS":
defaults[part] = "00"
else:
defaults[part] = datestr(now, "%" + part[0])
for format in formats:
try:
when, offset = strdate(date, format, defaults)
except (ValueError, OverflowError):
pass
else:
break
else:
raise Abort(_('invalid date: %r ') % date)
# validate explicit (probably user-specified) date and
# time zone offset. values must fit in signed 32 bits for
# current 32-bit linux runtimes. timezones go from UTC-12
# to UTC+14
if abs(when) > 0x7fffffff:
raise Abort(_('date exceeds 32 bits: %d') % when)
if offset < -50400 or offset > 43200:
raise Abort(_('impossible time zone offset: %d') % offset)
return when, offset
def matchdate(date):
"""Return a function that matches a given date match specifier
Formats include:
'{date}' match a given date to the accuracy provided
'<{date}' on or before a given date
'>{date}' on or after a given date
"""
def lower(date):
d = dict(mb="1", d="1")
return parsedate(date, extendeddateformats, d)[0]
def upper(date):
d = dict(mb="12", HI="23", M="59", S="59")
for days in "31 30 29".split():
try:
d["d"] = days
return parsedate(date, extendeddateformats, d)[0]
except:
pass
d["d"] = "28"
return parsedate(date, extendeddateformats, d)[0]
date = date.strip()
if date[0] == "<":
when = upper(date[1:])
return lambda x: x <= when
elif date[0] == ">":
when = lower(date[1:])
return lambda x: x >= when
elif date[0] == "-":
try:
days = int(date[1:])
except ValueError:
raise Abort(_("invalid day spec: %s") % date[1:])
when = makedate()[0] - days * 3600 * 24
return lambda x: x >= when
elif " to " in date:
a, b = date.split(" to ")
start, stop = lower(a), upper(b)
return lambda x: x >= start and x <= stop
else:
start, stop = lower(date), upper(date)
return lambda x: x >= start and x <= stop
def shortuser(user):
"""Return a short representation of a user name or email address."""
f = user.find('@')
if f >= 0:
user = user[:f]
f = user.find('<')
if f >= 0:
user = user[f+1:]
f = user.find(' ')
if f >= 0:
user = user[:f]
f = user.find('.')
if f >= 0:
user = user[:f]
return user
def email(author):
'''get email of author.'''
r = author.find('>')
if r == -1: r = None
return author[author.find('<')+1:r]
def ellipsis(text, maxlength=400):
"""Trim string to at most maxlength (default: 400) characters."""
if len(text) <= maxlength:
return text
else:
return "%s..." % (text[:maxlength-3])
def walkrepos(path, followsym=False, seen_dirs=None, recurse=False):
'''yield every hg repository under path, recursively.'''
def errhandler(err):
if err.filename == path:
raise err
if followsym and hasattr(os.path, 'samestat'):
def _add_dir_if_not_there(dirlst, dirname):
match = False
samestat = os.path.samestat
dirstat = os.stat(dirname)
for lstdirstat in dirlst:
if samestat(dirstat, lstdirstat):
match = True
break
if not match:
dirlst.append(dirstat)
return not match
else:
followsym = False
if (seen_dirs is None) and followsym:
seen_dirs = []
_add_dir_if_not_there(seen_dirs, path)
for root, dirs, files in os.walk(path, topdown=True, onerror=errhandler):
if '.hg' in dirs:
yield root # found a repository
qroot = os.path.join(root, '.hg', 'patches')
if os.path.isdir(os.path.join(qroot, '.hg')):
yield qroot # we have a patch queue repo here
if recurse:
# avoid recursing inside the .hg directory
dirs.remove('.hg')
else:
dirs[:] = [] # don't descend further
elif followsym:
newdirs = []
for d in dirs:
fname = os.path.join(root, d)
if _add_dir_if_not_there(seen_dirs, fname):
if os.path.islink(fname):
for hgname in walkrepos(fname, True, seen_dirs):
yield hgname
else:
newdirs.append(d)
dirs[:] = newdirs
_rcpath = None
def os_rcpath():
'''return default os-specific hgrc search path'''
path = system_rcpath()
path.extend(user_rcpath())
path = [os.path.normpath(f) for f in path]
return path
def rcpath():
'''return hgrc search path. if env var HGRCPATH is set, use it.
for each item in path, if directory, use files ending in .rc,
else use item.
make HGRCPATH empty to only look in .hg/hgrc of current repo.
if no HGRCPATH, use default os-specific path.'''
global _rcpath
if _rcpath is None:
if 'HGRCPATH' in os.environ:
_rcpath = []
for p in os.environ['HGRCPATH'].split(os.pathsep):
if not p: continue
if os.path.isdir(p):
for f, kind in osutil.listdir(p):
if f.endswith('.rc'):
_rcpath.append(os.path.join(p, f))
else:
_rcpath.append(p)
else:
_rcpath = os_rcpath()
return _rcpath
def bytecount(nbytes):
'''return byte count formatted as readable string, with units'''
units = (
(100, 1<<30, _('%.0f GB')),
(10, 1<<30, _('%.1f GB')),
(1, 1<<30, _('%.2f GB')),
(100, 1<<20, _('%.0f MB')),
(10, 1<<20, _('%.1f MB')),
(1, 1<<20, _('%.2f MB')),
(100, 1<<10, _('%.0f KB')),
(10, 1<<10, _('%.1f KB')),
(1, 1<<10, _('%.2f KB')),
(1, 1, _('%.0f bytes')),
)
for multiplier, divisor, format in units:
if nbytes >= divisor * multiplier:
return format % (nbytes / float(divisor))
return units[-1][2] % nbytes
def drop_scheme(scheme, path):
sc = scheme + ':'
if path.startswith(sc):
path = path[len(sc):]
if path.startswith('//'):
path = path[2:]
return path
def uirepr(s):
# Avoid double backslash in Windows path repr()
return repr(s).replace('\\\\', '\\')
def termwidth():
if 'COLUMNS' in os.environ:
try:
return int(os.environ['COLUMNS'])
except ValueError:
pass
try:
import termios, array, fcntl
for dev in (sys.stdout, sys.stdin):
try:
try:
fd = dev.fileno()
except AttributeError:
continue
if not os.isatty(fd):
continue
arri = fcntl.ioctl(fd, termios.TIOCGWINSZ, '\0' * 8)
return array.array('h', arri)[1]
except ValueError:
pass
except ImportError:
pass
return 80
def wrap(line, hangindent, width=None):
if width is None:
width = termwidth() - 2
padding = '\n' + ' ' * hangindent
return padding.join(textwrap.wrap(line, width=width - hangindent))
def iterlines(iterator):
for chunk in iterator:
for line in chunk.splitlines():
yield line