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##############################################################################
# Copyright (c) 2013, Lawrence Livermore National Security, LLC.
# Produced at the Lawrence Livermore National Laboratory.
#
# This file is part of Spack.
# Written by Todd Gamblin, tgamblin@llnl.gov, All rights reserved.
# LLNL-CODE-647188
#
# For details, see https://scalability-llnl.github.io/spack
# Please also see the LICENSE file for our notice and the LGPL.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License (as published by
# the Free Software Foundation) version 2.1 dated February 1999.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the IMPLIED WARRANTY OF
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the terms and
# conditions of the GNU General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
##############################################################################
__all__ = ['set_install_permissions', 'install', 'expand_user', 'working_dir',
'touch', 'mkdirp', 'force_remove', 'join_path', 'ancestor',
'can_access', 'filter_file', 'change_sed_delimiter', 'is_exe']
import os
import sys
import re
import shutil
import stat
import errno
import getpass
from contextlib import contextmanager, closing
from tempfile import NamedTemporaryFile
import llnl.util.tty as tty
from spack.util.compression import ALLOWED_ARCHIVE_TYPES
def filter_file(regex, repl, *filenames, **kwargs):
"""Like sed, but uses python regular expressions.
Filters every line of file through regex and replaces the file
with a filtered version. Preserves mode of filtered files.
As with re.sub, ``repl`` can be either a string or a callable.
If it is a callable, it is passed the match object and should
return a suitable replacement string. If it is a string, it
can contain ``\1``, ``\2``, etc. to represent back-substitution
as sed would allow.
Keyword Options:
string[=False] If True, treat regex as a plain string.
backup[=True] Make a backup files suffixed with ~
ignore_absent[=False] Ignore any files that don't exist.
"""
string = kwargs.get('string', False)
backup = kwargs.get('backup', True)
ignore_absent = kwargs.get('ignore_absent', False)
# Allow strings to use \1, \2, etc. for replacement, like sed
if not callable(repl):
unescaped = repl.replace(r'\\', '\\')
def replace_groups_with_groupid(m):
def groupid_to_group(x):
return m.group(int(x.group(1)))
return re.sub(r'\\([1-9])', groupid_to_group, unescaped)
repl = replace_groups_with_groupid
if string:
regex = re.escape(regex)
for filename in filenames:
backup = filename + "~"
if ignore_absent and not os.path.exists(filename):
continue
shutil.copy(filename, backup)
try:
with closing(open(backup)) as infile:
with closing(open(filename, 'w')) as outfile:
for line in infile:
foo = re.sub(regex, repl, line)
outfile.write(foo)
except:
# clean up the original file on failure.
shutil.move(backup, filename)
raise
finally:
if not backup:
shutil.rmtree(backup, ignore_errors=True)
def change_sed_delimiter(old_delim, new_delim, *filenames):
"""Find all sed search/replace commands and change the delimiter.
e.g., if the file contains seds that look like 's///', you can
call change_sed_delimeter('/', '@', file) to change the
delimiter to '@'.
NOTE that this routine will fail if the delimiter is ' or ".
Handling those is left for future work.
"""
assert(len(old_delim) == 1)
assert(len(new_delim) == 1)
# TODO: handle these cases one day?
assert(old_delim != '"')
assert(old_delim != "'")
assert(new_delim != '"')
assert(new_delim != "'")
whole_lines = "^s@([^@]*)@(.*)@[gIp]$"
whole_lines = whole_lines.replace('@', old_delim)
single_quoted = r"'s@((?:\\'|[^@'])*)@((?:\\'|[^'])*)@[gIp]?'"
single_quoted = single_quoted.replace('@', old_delim)
double_quoted = r'"s@((?:\\"|[^@"])*)@((?:\\"|[^"])*)@[gIp]?"'
double_quoted = double_quoted.replace('@', old_delim)
repl = r's@\1@\2@g'
repl = repl.replace('@', new_delim)
for f in filenames:
filter_file(whole_lines, repl, f)
filter_file(single_quoted, "'%s'" % repl, f)
filter_file(double_quoted, '"%s"' % repl, f)
def set_install_permissions(path):
"""Set appropriate permissions on the installed file."""
if os.path.isdir(path):
os.chmod(path, 0755)
else:
os.chmod(path, 0644)
def install(src, dest):
"""Manually install a file to a particular location."""
tty.info("Installing %s to %s" % (src, dest))
shutil.copy(src, dest)
set_install_permissions(dest)
src_mode = os.stat(src).st_mode
dest_mode = os.stat(dest).st_mode
if src_mode | stat.S_IXUSR: dest_mode |= stat.S_IXUSR
if src_mode | stat.S_IXGRP: dest_mode |= stat.S_IXGRP
if src_mode | stat.S_IXOTH: dest_mode |= stat.S_IXOTH
os.chmod(dest, dest_mode)
def is_exe(path):
"""True if path is an executable file."""
return os.path.isfile(path) and os.access(path, os.X_OK)
def expand_user(path):
"""Find instances of '%u' in a path and replace with the current user's
username."""
username = getpass.getuser()
if not username and '%u' in path:
tty.die("Couldn't get username to complete path '%s'" % path)
return path.replace('%u', username)
def mkdirp(*paths):
"""Creates a directory, as well as parent directories if needed."""
for path in paths:
if not os.path.exists(path):
os.makedirs(path)
elif not os.path.isdir(path):
raise OSError(errno.EEXIST, "File alredy exists", path)
def force_remove(*paths):
"""Remove files without printing errors. Like rm -f, does NOT
remove directories."""
for path in paths:
try:
os.remove(path)
except OSError, e:
pass
@contextmanager
def working_dir(dirname, **kwargs):
if kwargs.get('create', False):
mkdirp(dirname)
orig_dir = os.getcwd()
os.chdir(dirname)
yield
os.chdir(orig_dir)
def touch(path):
"""Creates an empty file at the specified path."""
with closing(open(path, 'a')) as file:
os.utime(path, None)
def join_path(prefix, *args):
path = str(prefix)
for elt in args:
path = os.path.join(path, str(elt))
return path
def ancestor(dir, n=1):
"""Get the nth ancestor of a directory."""
parent = os.path.abspath(dir)
for i in range(n):
parent = os.path.dirname(parent)
return parent
def can_access(file_name):
"""True if we have read/write access to the file."""
return os.access(file_name, os.R_OK|os.W_OK)
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