add hg and python

1 files changed, 252 insertions, 0 deletions

diff --git a/sys/src/cmd/hg/mercurial/posix.py b/sys/src/cmd/hg/mercurial/posix.py
new file mode 100644
index 000000000..09fd7cdc5
--- /dev/null
+++ b/sys/src/cmd/hg/mercurial/posix.py
@@ -0,0 +1,252 @@
+# 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)