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# posix.py - Posix utility function implementations for Mercurial
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#
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# Copyright 2005-2009 Matt Mackall <mpm@selenic.com> and others
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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from __future__ import absolute_import
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import errno
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import fcntl
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import getpass
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import grp
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import os
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import pwd
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import re
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import select
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import stat
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import sys
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import tempfile
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import unicodedata
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from .i18n import _
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from . import (
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encoding,
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pycompat,
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)
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posixfile = open
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normpath = os.path.normpath
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samestat = os.path.samestat
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try:
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oslink = os.link
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except AttributeError:
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# Some platforms build Python without os.link on systems that are
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# vaguely unix-like but don't have hardlink support. For those
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# poor souls, just say we tried and that it failed so we fall back
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# to copies.
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def oslink(src, dst):
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raise OSError(errno.EINVAL,
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'hardlinks not supported: %s to %s' % (src, dst))
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unlink = os.unlink
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rename = os.rename
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removedirs = os.removedirs
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expandglobs = False
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umask = os.umask(0)
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os.umask(umask)
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def split(p):
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'''Same as posixpath.split, but faster
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>>> import posixpath
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>>> for f in ['/absolute/path/to/file',
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... 'relative/path/to/file',
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... 'file_alone',
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... 'path/to/directory/',
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... '/multiple/path//separators',
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... '/file_at_root',
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... '///multiple_leading_separators_at_root',
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... '']:
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... assert split(f) == posixpath.split(f), f
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'''
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ht = p.rsplit('/', 1)
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if len(ht) == 1:
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return '', p
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nh = ht[0].rstrip('/')
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if nh:
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return nh, ht[1]
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return ht[0] + '/', ht[1]
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def openhardlinks():
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'''return true if it is safe to hold open file handles to hardlinks'''
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return True
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def nlinks(name):
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'''return number of hardlinks for the given file'''
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return os.lstat(name).st_nlink
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def parsepatchoutput(output_line):
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"""parses the output produced by patch and returns the filename"""
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pf = output_line[14:]
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if os.sys.platform == 'OpenVMS':
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if pf[0] == '`':
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pf = pf[1:-1] # Remove the quotes
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else:
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if pf.startswith("'") and pf.endswith("'") and " " in pf:
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pf = pf[1:-1] # Remove the quotes
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return pf
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def sshargs(sshcmd, host, user, port):
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'''Build argument list for ssh'''
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args = user and ("%s@%s" % (user, host)) or host
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return port and ("%s -p %s" % (args, port)) or args
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def isexec(f):
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"""check whether a file is executable"""
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return (os.lstat(f).st_mode & 0o100 != 0)
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def setflags(f, l, x):
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s = os.lstat(f).st_mode
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if l:
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if not stat.S_ISLNK(s):
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# switch file to link
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fp = open(f)
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data = fp.read()
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fp.close()
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os.unlink(f)
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try:
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os.symlink(data, f)
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except OSError:
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# failed to make a link, rewrite file
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fp = open(f, "w")
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fp.write(data)
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fp.close()
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# no chmod needed at this point
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return
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if stat.S_ISLNK(s):
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# switch link to file
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data = os.readlink(f)
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os.unlink(f)
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fp = open(f, "w")
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fp.write(data)
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fp.close()
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s = 0o666 & ~umask # avoid restatting for chmod
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sx = s & 0o100
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if x and not sx:
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# Turn on +x for every +r bit when making a file executable
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# and obey umask.
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os.chmod(f, s | (s & 0o444) >> 2 & ~umask)
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elif not x and sx:
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# Turn off all +x bits
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os.chmod(f, s & 0o666)
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def copymode(src, dst, mode=None):
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'''Copy the file mode from the file at path src to dst.
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If src doesn't exist, we're using mode instead. If mode is None, we're
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using umask.'''
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try:
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st_mode = os.lstat(src).st_mode & 0o777
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except OSError as inst:
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if inst.errno != errno.ENOENT:
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raise
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st_mode = mode
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if st_mode is None:
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st_mode = ~umask
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st_mode &= 0o666
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os.chmod(dst, st_mode)
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def checkexec(path):
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"""
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Check whether the given path is on a filesystem with UNIX-like exec flags
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Requires a directory (like /foo/.hg)
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"""
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# VFAT on some Linux versions can flip mode but it doesn't persist
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# a FS remount. Frequently we can detect it if files are created
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# with exec bit on.
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try:
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EXECFLAGS = stat.S_IXUSR | stat.S_IXGRP | stat.S_IXOTH
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cachedir = os.path.join(path, '.hg', 'cache')
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if os.path.isdir(cachedir):
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checkisexec = os.path.join(cachedir, 'checkisexec')
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checknoexec = os.path.join(cachedir, 'checknoexec')
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try:
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m = os.stat(checkisexec).st_mode
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except OSError as e:
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if e.errno != errno.ENOENT:
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raise
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# checkisexec does not exist - fall through ...
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else:
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# checkisexec exists, check if it actually is exec
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if m & EXECFLAGS != 0:
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# ensure checkisexec exists, check it isn't exec
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try:
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m = os.stat(checknoexec).st_mode
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except OSError as e:
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if e.errno != errno.ENOENT:
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raise
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file(checknoexec, 'w').close() # might fail
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m = os.stat(checknoexec).st_mode
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if m & EXECFLAGS == 0:
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# check-exec is exec and check-no-exec is not exec
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return True
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# checknoexec exists but is exec - delete it
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os.unlink(checknoexec)
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# checkisexec exists but is not exec - delete it
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os.unlink(checkisexec)
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# check using one file, leave it as checkisexec
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checkdir = cachedir
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else:
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# check directly in path and don't leave checkisexec behind
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checkdir = path
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checkisexec = None
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fh, fn = tempfile.mkstemp(dir=checkdir, prefix='hg-checkexec-')
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try:
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os.close(fh)
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m = os.stat(fn).st_mode
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if m & EXECFLAGS == 0:
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os.chmod(fn, m & 0o777 | EXECFLAGS)
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if os.stat(fn).st_mode & EXECFLAGS != 0:
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if checkisexec is not None:
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os.rename(fn, checkisexec)
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fn = None
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return True
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finally:
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if fn is not None:
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os.unlink(fn)
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except (IOError, OSError):
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# we don't care, the user probably won't be able to commit anyway
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return False
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def checklink(path):
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"""check whether the given path is on a symlink-capable filesystem"""
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# mktemp is not racy because symlink creation will fail if the
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# file already exists
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while True:
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cachedir = os.path.join(path, '.hg', 'cache')
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checklink = os.path.join(cachedir, 'checklink')
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# try fast path, read only
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if os.path.islink(checklink):
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return True
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if os.path.isdir(cachedir):
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checkdir = cachedir
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else:
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checkdir = path
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cachedir = None
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name = tempfile.mktemp(dir=checkdir, prefix='checklink-')
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try:
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fd = None
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if cachedir is None:
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fd = tempfile.NamedTemporaryFile(dir=checkdir,
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prefix='hg-checklink-')
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target = os.path.basename(fd.name)
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else:
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# create a fixed file to link to; doesn't matter if it
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# already exists.
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target = 'checklink-target'
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open(os.path.join(cachedir, target), 'w').close()
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try:
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os.symlink(target, name)
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if cachedir is None:
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os.unlink(name)
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else:
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try:
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os.rename(name, checklink)
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except OSError:
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os.unlink(name)
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return True
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except OSError as inst:
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# link creation might race, try again
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if inst[0] == errno.EEXIST:
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continue
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raise
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finally:
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if fd is not None:
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fd.close()
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except AttributeError:
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return False
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except OSError as inst:
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# sshfs might report failure while successfully creating the link
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if inst[0] == errno.EIO and os.path.exists(name):
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os.unlink(name)
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return False
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def checkosfilename(path):
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'''Check that the base-relative path is a valid filename on this platform.
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Returns None if the path is ok, or a UI string describing the problem.'''
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pass # on posix platforms, every path is ok
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def setbinary(fd):
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pass
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def pconvert(path):
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return path
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def localpath(path):
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return path
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def samefile(fpath1, fpath2):
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"""Returns whether path1 and path2 refer to the same file. This is only
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guaranteed to work for files, not directories."""
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return os.path.samefile(fpath1, fpath2)
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def samedevice(fpath1, fpath2):
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"""Returns whether fpath1 and fpath2 are on the same device. This is only
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guaranteed to work for files, not directories."""
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st1 = os.lstat(fpath1)
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st2 = os.lstat(fpath2)
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return st1.st_dev == st2.st_dev
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# os.path.normcase is a no-op, which doesn't help us on non-native filesystems
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def normcase(path):
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return path.lower()
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# what normcase does to ASCII strings
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normcasespec = encoding.normcasespecs.lower
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# fallback normcase function for non-ASCII strings
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normcasefallback = normcase
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if pycompat.sysplatform == 'darwin':
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def normcase(path):
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'''
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Normalize a filename for OS X-compatible comparison:
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- escape-encode invalid characters
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- decompose to NFD
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- lowercase
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- omit ignored characters [200c-200f, 202a-202e, 206a-206f,feff]
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>>> normcase('UPPER')
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'upper'
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>>> normcase('Caf\xc3\xa9')
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'cafe\\xcc\\x81'
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>>> normcase('\xc3\x89')
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'e\\xcc\\x81'
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>>> normcase('\xb8\xca\xc3\xca\xbe\xc8.JPG') # issue3918
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'%b8%ca%c3\\xca\\xbe%c8.jpg'
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'''
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try:
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return encoding.asciilower(path) # exception for non-ASCII
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except UnicodeDecodeError:
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return normcasefallback(path)
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normcasespec = encoding.normcasespecs.lower
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def normcasefallback(path):
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try:
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u = path.decode('utf-8')
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except UnicodeDecodeError:
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# OS X percent-encodes any bytes that aren't valid utf-8
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s = ''
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pos = 0
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l = len(path)
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while pos < l:
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try:
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c = encoding.getutf8char(path, pos)
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pos += len(c)
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except ValueError:
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c = '%%%02X' % ord(path[pos])
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pos += 1
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s += c
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u = s.decode('utf-8')
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# Decompose then lowercase (HFS+ technote specifies lower)
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enc = unicodedata.normalize('NFD', u).lower().encode('utf-8')
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# drop HFS+ ignored characters
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return encoding.hfsignoreclean(enc)
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if pycompat.sysplatform == 'cygwin':
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# workaround for cygwin, in which mount point part of path is
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# treated as case sensitive, even though underlying NTFS is case
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# insensitive.
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# default mount points
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cygwinmountpoints = sorted([
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"/usr/bin",
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"/usr/lib",
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"/cygdrive",
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], reverse=True)
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# use upper-ing as normcase as same as NTFS workaround
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def normcase(path):
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pathlen = len(path)
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if (pathlen == 0) or (path[0] != pycompat.ossep):
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# treat as relative
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return encoding.upper(path)
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# to preserve case of mountpoint part
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for mp in cygwinmountpoints:
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if not path.startswith(mp):
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continue
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mplen = len(mp)
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if mplen == pathlen: # mount point itself
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return mp
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if path[mplen] == pycompat.ossep:
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return mp + encoding.upper(path[mplen:])
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return encoding.upper(path)
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normcasespec = encoding.normcasespecs.other
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normcasefallback = normcase
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# Cygwin translates native ACLs to POSIX permissions,
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# but these translations are not supported by native
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# tools, so the exec bit tends to be set erroneously.
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# Therefore, disable executable bit access on Cygwin.
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def checkexec(path):
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return False
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# Similarly, Cygwin's symlink emulation is likely to create
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# problems when Mercurial is used from both Cygwin and native
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# Windows, with other native tools, or on shared volumes
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def checklink(path):
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return False
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_needsshellquote = None
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def shellquote(s):
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if os.sys.platform == 'OpenVMS':
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return '"%s"' % s
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global _needsshellquote
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if _needsshellquote is None:
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_needsshellquote = re.compile(r'[^a-zA-Z0-9._/+-]').search
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if s and not _needsshellquote(s):
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# "s" shouldn't have to be quoted
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return s
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else:
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return "'%s'" % s.replace("'", "'\\''")
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def quotecommand(cmd):
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return cmd
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def popen(command, mode='r'):
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return os.popen(command, mode)
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def testpid(pid):
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'''return False if pid dead, True if running or not sure'''
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if os.sys.platform == 'OpenVMS':
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return True
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try:
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os.kill(pid, 0)
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return True
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except OSError as inst:
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return inst.errno != errno.ESRCH
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def explainexit(code):
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"""return a 2-tuple (desc, code) describing a subprocess status
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(codes from kill are negative - not os.system/wait encoding)"""
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if code >= 0:
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return _("exited with status %d") % code, code
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return _("killed by signal %d") % -code, -code
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def isowner(st):
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"""Return True if the stat object st is from the current user."""
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return st.st_uid == os.getuid()
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def findexe(command):
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'''Find executable for command searching like which does.
|
|
|
If command is a basename then PATH is searched for command.
|
|
|
PATH isn't searched if command is an absolute or relative path.
|
|
|
If command isn't found None is returned.'''
|
|
|
if pycompat.sysplatform == 'OpenVMS':
|
|
|
return command
|
|
|
|
|
|
def findexisting(executable):
|
|
|
'Will return executable if existing file'
|
|
|
if os.path.isfile(executable) and os.access(executable, os.X_OK):
|
|
|
return executable
|
|
|
return None
|
|
|
|
|
|
if pycompat.ossep in command:
|
|
|
return findexisting(command)
|
|
|
|
|
|
if pycompat.sysplatform == 'plan9':
|
|
|
return findexisting(os.path.join('/bin', command))
|
|
|
|
|
|
for path in encoding.environ.get('PATH', '').split(pycompat.ospathsep):
|
|
|
executable = findexisting(os.path.join(path, command))
|
|
|
if executable is not None:
|
|
|
return executable
|
|
|
return None
|
|
|
|
|
|
def setsignalhandler():
|
|
|
pass
|
|
|
|
|
|
_wantedkinds = set([stat.S_IFREG, stat.S_IFLNK])
|
|
|
|
|
|
def statfiles(files):
|
|
|
'''Stat each file in files. Yield each stat, or None if a file does not
|
|
|
exist or has a type we don't care about.'''
|
|
|
lstat = os.lstat
|
|
|
getkind = stat.S_IFMT
|
|
|
for nf in files:
|
|
|
try:
|
|
|
st = lstat(nf)
|
|
|
if getkind(st.st_mode) not in _wantedkinds:
|
|
|
st = None
|
|
|
except OSError as err:
|
|
|
if err.errno not in (errno.ENOENT, errno.ENOTDIR):
|
|
|
raise
|
|
|
st = None
|
|
|
yield st
|
|
|
|
|
|
def getuser():
|
|
|
'''return name of current user'''
|
|
|
return getpass.getuser()
|
|
|
|
|
|
def username(uid=None):
|
|
|
"""Return the name of the user with the given uid.
|
|
|
|
|
|
If uid is None, return the name of the current user."""
|
|
|
|
|
|
if uid is None:
|
|
|
uid = os.getuid()
|
|
|
try:
|
|
|
return pwd.getpwuid(uid)[0]
|
|
|
except KeyError:
|
|
|
return str(uid)
|
|
|
|
|
|
def groupname(gid=None):
|
|
|
"""Return the name of the group with the given gid.
|
|
|
|
|
|
If gid is None, return the name of the current group."""
|
|
|
|
|
|
if gid is None:
|
|
|
gid = os.getgid()
|
|
|
try:
|
|
|
return grp.getgrgid(gid)[0]
|
|
|
except KeyError:
|
|
|
return str(gid)
|
|
|
|
|
|
def groupmembers(name):
|
|
|
"""Return the list of members of the group with the given
|
|
|
name, KeyError if the group does not exist.
|
|
|
"""
|
|
|
return list(grp.getgrnam(name).gr_mem)
|
|
|
|
|
|
def spawndetached(args):
|
|
|
return os.spawnvp(os.P_NOWAIT | getattr(os, 'P_DETACH', 0),
|
|
|
args[0], args)
|
|
|
|
|
|
def gethgcmd():
|
|
|
return sys.argv[:1]
|
|
|
|
|
|
def makedir(path, notindexed):
|
|
|
os.mkdir(path)
|
|
|
|
|
|
def unlinkpath(f, ignoremissing=False):
|
|
|
"""unlink and remove the directory if it is empty"""
|
|
|
try:
|
|
|
os.unlink(f)
|
|
|
except OSError as e:
|
|
|
if not (ignoremissing and e.errno == errno.ENOENT):
|
|
|
raise
|
|
|
# try removing directories that might now be empty
|
|
|
try:
|
|
|
os.removedirs(os.path.dirname(f))
|
|
|
except OSError:
|
|
|
pass
|
|
|
|
|
|
def lookupreg(key, name=None, scope=None):
|
|
|
return None
|
|
|
|
|
|
def hidewindow():
|
|
|
"""Hide current shell window.
|
|
|
|
|
|
Used to hide the window opened when starting asynchronous
|
|
|
child process under Windows, unneeded on other systems.
|
|
|
"""
|
|
|
pass
|
|
|
|
|
|
class cachestat(object):
|
|
|
def __init__(self, path):
|
|
|
self.stat = os.stat(path)
|
|
|
|
|
|
def cacheable(self):
|
|
|
return bool(self.stat.st_ino)
|
|
|
|
|
|
__hash__ = object.__hash__
|
|
|
|
|
|
def __eq__(self, other):
|
|
|
try:
|
|
|
# Only dev, ino, size, mtime and atime are likely to change. Out
|
|
|
# of these, we shouldn't compare atime but should compare the
|
|
|
# rest. However, one of the other fields changing indicates
|
|
|
# something fishy going on, so return False if anything but atime
|
|
|
# changes.
|
|
|
return (self.stat.st_mode == other.stat.st_mode and
|
|
|
self.stat.st_ino == other.stat.st_ino and
|
|
|
self.stat.st_dev == other.stat.st_dev and
|
|
|
self.stat.st_nlink == other.stat.st_nlink and
|
|
|
self.stat.st_uid == other.stat.st_uid and
|
|
|
self.stat.st_gid == other.stat.st_gid and
|
|
|
self.stat.st_size == other.stat.st_size and
|
|
|
self.stat.st_mtime == other.stat.st_mtime and
|
|
|
self.stat.st_ctime == other.stat.st_ctime)
|
|
|
except AttributeError:
|
|
|
return False
|
|
|
|
|
|
def __ne__(self, other):
|
|
|
return not self == other
|
|
|
|
|
|
def executablepath():
|
|
|
return None # available on Windows only
|
|
|
|
|
|
def statislink(st):
|
|
|
'''check whether a stat result is a symlink'''
|
|
|
return st and stat.S_ISLNK(st.st_mode)
|
|
|
|
|
|
def statisexec(st):
|
|
|
'''check whether a stat result is an executable file'''
|
|
|
return st and (st.st_mode & 0o100 != 0)
|
|
|
|
|
|
def poll(fds):
|
|
|
"""block until something happens on any file descriptor
|
|
|
|
|
|
This is a generic helper that will check for any activity
|
|
|
(read, write. exception) and return the list of touched files.
|
|
|
|
|
|
In unsupported cases, it will raise a NotImplementedError"""
|
|
|
try:
|
|
|
res = select.select(fds, fds, fds)
|
|
|
except ValueError: # out of range file descriptor
|
|
|
raise NotImplementedError()
|
|
|
return sorted(list(set(sum(res, []))))
|
|
|
|
|
|
def readpipe(pipe):
|
|
|
"""Read all available data from a pipe."""
|
|
|
# We can't fstat() a pipe because Linux will always report 0.
|
|
|
# So, we set the pipe to non-blocking mode and read everything
|
|
|
# that's available.
|
|
|
flags = fcntl.fcntl(pipe, fcntl.F_GETFL)
|
|
|
flags |= os.O_NONBLOCK
|
|
|
oldflags = fcntl.fcntl(pipe, fcntl.F_SETFL, flags)
|
|
|
|
|
|
try:
|
|
|
chunks = []
|
|
|
while True:
|
|
|
try:
|
|
|
s = pipe.read()
|
|
|
if not s:
|
|
|
break
|
|
|
chunks.append(s)
|
|
|
except IOError:
|
|
|
break
|
|
|
|
|
|
return ''.join(chunks)
|
|
|
finally:
|
|
|
fcntl.fcntl(pipe, fcntl.F_SETFL, oldflags)
|
|
|
|
|
|
def bindunixsocket(sock, path):
|
|
|
"""Bind the UNIX domain socket to the specified path"""
|
|
|
# use relative path instead of full path at bind() if possible, since
|
|
|
# AF_UNIX path has very small length limit (107 chars) on common
|
|
|
# platforms (see sys/un.h)
|
|
|
dirname, basename = os.path.split(path)
|
|
|
bakwdfd = None
|
|
|
if dirname:
|
|
|
bakwdfd = os.open('.', os.O_DIRECTORY)
|
|
|
os.chdir(dirname)
|
|
|
sock.bind(basename)
|
|
|
if bakwdfd:
|
|
|
os.fchdir(bakwdfd)
|
|
|
os.close(bakwdfd)
|
|
|
|