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# posix.py - Posix utility function implementations for Mercurial
#
# Copyright 2005-2009 Matt Mackall <mpm@selenic.com> and others
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
from i18n import _
import os, sys, errno, stat, getpass, pwd, grp, tempfile
posixfile = open
nulldev = '/dev/null'
normpath = os.path.normpath
samestat = os.path.samestat
oslink = os.link
unlink = os.unlink
rename = os.rename
expandglobs = False
umask = os.umask(0)
os.umask(umask)
def openhardlinks():
'''return true if it is safe to hold open file handles to hardlinks'''
return True
def nlinks(name):
'''return number of hardlinks for the given file'''
return os.lstat(name).st_nlink
def parsepatchoutput(output_line):
"""parses the output produced by patch and returns the filename"""
pf = output_line[14:]
if os.sys.platform == 'OpenVMS':
if pf[0] == '`':
pf = pf[1:-1] # Remove the quotes
else:
if pf.startswith("'") and pf.endswith("'") and " " in pf:
pf = pf[1:-1] # Remove the quotes
return pf
def sshargs(sshcmd, host, user, port):
'''Build argument list for ssh'''
args = user and ("%s@%s" % (user, host)) or host
return port and ("%s -p %s" % (args, port)) or args
def isexec(f):
"""check whether a file is executable"""
return (os.lstat(f).st_mode & 0100 != 0)
def setflags(f, l, x):
s = os.lstat(f).st_mode
if l:
if not stat.S_ISLNK(s):
# switch file to link
fp = open(f)
data = fp.read()
fp.close()
os.unlink(f)
try:
os.symlink(data, f)
except OSError:
# failed to make a link, rewrite file
fp = open(f, "w")
fp.write(data)
fp.close()
# no chmod needed at this point
return
if stat.S_ISLNK(s):
# switch link to file
data = os.readlink(f)
os.unlink(f)
fp = open(f, "w")
fp.write(data)
fp.close()
s = 0666 & ~umask # avoid restatting for chmod
sx = s & 0100
if x and not sx:
# Turn on +x for every +r bit when making a file executable
# and obey umask.
os.chmod(f, s | (s & 0444) >> 2 & ~umask)
elif not x and sx:
# Turn off all +x bits
os.chmod(f, s & 0666)
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(dir=path, prefix='hg-checkexec-')
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, prefix='hg-checklink-')
try:
os.symlink(".", name)
os.unlink(name)
return True
except (OSError, AttributeError):
return False
def checkosfilename(path):
'''Check that the base-relative path is a valid filename on this platform.
Returns None if the path is ok, or a UI string describing the problem.'''
pass # on posix platforms, every path is ok
def setbinary(fd):
pass
def pconvert(path):
return path
def localpath(path):
return path
def samefile(fpath1, fpath2):
"""Returns whether path1 and path2 refer to the same file. This is only
guaranteed to work for files, not directories."""
return os.path.samefile(fpath1, fpath2)
def samedevice(fpath1, fpath2):
"""Returns whether fpath1 and fpath2 are on the same device. This is only
guaranteed to work for files, not directories."""
st1 = os.lstat(fpath1)
st2 = os.lstat(fpath2)
return st1.st_dev == st2.st_dev
if sys.platform == 'darwin':
import fcntl # only needed on darwin, missing on jython
def realpath(path):
'''
Returns the true, canonical file system path equivalent to the given
path.
Equivalent means, in this case, resulting in the same, unique
file system link to the path. Every file system entry, whether a file,
directory, hard link or symbolic link or special, will have a single
path preferred by the system, but may allow multiple, differing path
lookups to point to it.
Most regular UNIX file systems only allow a file system entry to be
looked up by its distinct path. Obviously, this does not apply to case
insensitive file systems, whether case preserving or not. The most
complex issue to deal with is file systems transparently reencoding the
path, such as the non-standard Unicode normalisation required for HFS+
and HFSX.
'''
# Constants copied from /usr/include/sys/fcntl.h
F_GETPATH = 50
O_SYMLINK = 0x200000
try:
fd = os.open(path, O_SYMLINK)
except OSError, err:
if err.errno == errno.ENOENT:
return path
raise
try:
return fcntl.fcntl(fd, F_GETPATH, '\0' * 1024).rstrip('\0')
finally:
os.close(fd)
else:
# Fallback to the likely inadequate Python builtin function.
realpath = os.path.realpath
def shellquote(s):
if os.sys.platform == 'OpenVMS':
return '"%s"' % s
else:
return "'%s'" % s.replace("'", "'\\''")
def quotecommand(cmd):
return cmd
def popen(command, mode='r'):
return os.popen(command, mode)
def testpid(pid):
'''return False if pid dead, True if running or not sure'''
if os.sys.platform == 'OpenVMS':
return True
try:
os.kill(pid, 0)
return True
except OSError, inst:
return inst.errno != errno.ESRCH
def explainexit(code):
"""return a 2-tuple (desc, code) describing a subprocess status
(codes from kill are negative - not os.system/wait encoding)"""
if code >= 0:
return _("exited with status %d") % code, code
return _("killed by signal %d") % -code, -code
def isowner(st):
"""Return True if the stat object st is from the current user."""
return st.st_uid == os.getuid()
def findexe(command):
'''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 sys.platform == 'OpenVMS':
return command
def findexisting(executable):
'Will return executable if existing file'
if os.path.exists(executable):
return executable
return None
if os.sep in command:
return findexisting(command)
for path in os.environ.get('PATH', '').split(os.pathsep):
executable = findexisting(os.path.join(path, command))
if executable is not None:
return executable
return None
def setsignalhandler():
pass
def statfiles(files):
'Stat each file in files and yield stat or None if file does not exist.'
lstat = os.lstat
for nf in files:
try:
st = lstat(nf)
except OSError, 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 termwidth():
try:
import termios, array, fcntl
for dev in (sys.stderr, 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)
width = array.array('h', arri)[1]
if width > 0:
return width
except ValueError:
pass
except IOError, e:
if e[0] == errno.EINVAL:
pass
else:
raise
except ImportError:
pass
return 80