ref: a7f5ecaf636e38f407c951d0e86dcc4c4f424bd6
dir: /sys/src/cmd/hg/mercurial/posix.py/
# 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, incorporated herein by reference.
from i18n import _
import osutil
import os, sys, errno, stat, getpass, pwd, grp, fcntl
posixfile = open
nulldev = '/dev/null'
normpath = os.path.normpath
samestat = os.path.samestat
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 rcfiles(path):
rcs = [os.path.join(path, 'hgrc')]
rcdir = os.path.join(path, 'hgrc.d')
try:
rcs.extend([os.path.join(rcdir, f)
for f, kind in osutil.listdir(rcdir)
if f.endswith(".rc")])
except OSError:
pass
return rcs
def system_rcpath():
path = []
# old mod_python does not set sys.argv
if len(getattr(sys, 'argv', [])) > 0:
path.extend(rcfiles(os.path.dirname(sys.argv[0]) +
'/../etc/mercurial'))
path.extend(rcfiles('/etc/mercurial'))
return path
def user_rcpath():
return [os.path.expanduser('~/.hgrc')]
def parse_patch_output(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 is_exec(f):
"""check whether a file is executable"""
return (os.lstat(f).st_mode & 0100 != 0)
def set_flags(f, l, x):
s = os.lstat(f).st_mode
if l:
if not stat.S_ISLNK(s):
# switch file to link
data = open(f).read()
os.unlink(f)
try:
os.symlink(data, f)
except:
# failed to make a link, rewrite file
open(f, "w").write(data)
# no chmod needed at this point
return
if stat.S_ISLNK(s):
# switch link to file
data = os.readlink(f)
os.unlink(f)
open(f, "w").write(data)
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 set_binary(fd):
pass
def pconvert(path):
return path
def localpath(path):
return path
if sys.platform == 'darwin':
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 is 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 explain_exit(code):
"""return a 2-tuple (desc, code) describing a process's status"""
if os.WIFEXITED(code):
val = os.WEXITSTATUS(code)
return _("exited with status %d") % val, val
elif os.WIFSIGNALED(code):
val = os.WTERMSIG(code)
return _("killed by signal %d") % val, val
elif os.WIFSTOPPED(code):
val = os.WSTOPSIG(code)
return _("stopped by signal %d") % val, val
raise ValueError(_("invalid exit code"))
def isowner(st):
"""Return True if the stat object st is from the current user."""
return st.st_uid == os.getuid()
def find_exe(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 set_signal_handler():
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 expand_glob(pats):
'''On Windows, expand the implicit globs in a list of patterns'''
return list(pats)
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)