# MIT License
#
# Copyright The SCons Foundation
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
"""SCons platform selection.
Looks for modules that define a callable object that can modify a
construction environment as appropriate for a given platform.
Note that we take a more simplistic view of "platform" than Python does.
We're looking for a single string that determines a set of
tool-independent variables with which to initialize a construction
environment. Consequently, we'll examine both sys.platform and os.name
(and anything else that might come in to play) in order to return some
specification which is unique enough for our purposes.
Note that because this subsystem just *selects* a callable that can
modify a construction environment, it's possible for people to define
their own "platform specification" in an arbitrary callable function.
No one needs to use or tie in to this subsystem in order to roll
their own platform definition.
"""
import SCons.compat
import importlib
import os
import sys
import tempfile
import SCons.Errors
import SCons.Subst
import SCons.Tool
[docs]class TempFileMunge:
"""Convert long command lines to use a temporary file.
You can set an Environment variable (usually ``TEMPFILE``) to this,
then call it with a string argument, and it will perform temporary
file substitution on it. This is used to circumvent limitations on
the length of command lines. Example::
env["TEMPFILE"] = TempFileMunge
env["LINKCOM"] = "${TEMPFILE('$LINK $TARGET $SOURCES','$LINKCOMSTR')}"
By default, the name of the temporary file used begins with a
prefix of '@'. This may be configured for other tool chains by
setting the ``TEMPFILEPREFIX`` variable. Example::
env["TEMPFILEPREFIX"] = '-@' # diab compiler
env["TEMPFILEPREFIX"] = '-via' # arm tool chain
env["TEMPFILEPREFIX"] = '' # (the empty string) PC Lint
You can configure the extension of the temporary file through the
``TEMPFILESUFFIX`` variable, which defaults to '.lnk' (see comments
in the code below). Example::
env["TEMPFILESUFFIX"] = '.lnt' # PC Lint
Entries in the temporary file are separated by the value of the
``TEMPFILEARGJOIN`` variable, which defaults to an OS-appropriate value.
A default argument escape function is ``SCons.Subst.quote_spaces``.
If you need to apply extra operations on a command argument before
writing to a temporary file(fix Windows slashes, normalize paths, etc.),
please set `TEMPFILEARGESCFUNC` variable to a custom function. Example::
import sys
import re
from SCons.Subst import quote_spaces
WINPATHSEP_RE = re.compile(r"\\([^\"'\\]|$)")
def tempfile_arg_esc_func(arg):
arg = quote_spaces(arg)
if sys.platform != "win32":
return arg
# GCC requires double Windows slashes, let's use UNIX separator
return WINPATHSEP_RE.sub(r"/\1", arg)
env["TEMPFILEARGESCFUNC"] = tempfile_arg_esc_func
"""
def __init__(self, cmd, cmdstr = None):
self.cmd = cmd
self.cmdstr = cmdstr
def __call__(self, target, source, env, for_signature):
if for_signature:
# If we're being called for signature calculation, it's
# because we're being called by the string expansion in
# Subst.py, which has the logic to strip any $( $) that
# may be in the command line we squirreled away. So we
# just return the raw command line and let the upper
# string substitution layers do their thing.
return self.cmd
# Now we're actually being called because someone is actually
# going to try to execute the command, so we have to do our
# own expansion.
cmd = env.subst_list(self.cmd, SCons.Subst.SUBST_CMD, target, source)[0]
try:
maxline = int(env.subst('$MAXLINELENGTH'))
except ValueError:
maxline = 2048
length = 0
for c in cmd:
length += len(c)
length += len(cmd) - 1
if length <= maxline:
return self.cmd
# Check if we already created the temporary file for this target
# It should have been previously done by Action.strfunction() call
if SCons.Util.is_List(target):
node = target[0]
else:
node = target
cmdlist = None
if SCons.Util.is_List(self.cmd):
cmdlist_key = tuple(self.cmd)
else:
cmdlist_key = self.cmd
if node and hasattr(node.attributes, 'tempfile_cmdlist'):
cmdlist = node.attributes.tempfile_cmdlist.get(cmdlist_key, None)
if cmdlist is not None:
return cmdlist
# Default to the .lnk suffix for the benefit of the Phar Lap
# linkloc linker, which likes to append an .lnk suffix if
# none is given.
if 'TEMPFILESUFFIX' in env:
suffix = env.subst('$TEMPFILESUFFIX')
else:
suffix = '.lnk'
if 'TEMPFILEDIR' in env:
tempfile_dir = env.subst('$TEMPFILEDIR')
os.makedirs(tempfile_dir, exist_ok=True)
else:
tempfile_dir = None
fd, tmp = tempfile.mkstemp(suffix, dir=tempfile_dir, text=True)
native_tmp = SCons.Util.get_native_path(tmp)
if env.get('SHELL', None) == 'sh':
# The sh shell will try to escape the backslashes in the
# path, so unescape them.
native_tmp = native_tmp.replace('\\', r'\\\\')
# In Cygwin, we want to use rm to delete the temporary
# file, because del does not exist in the sh shell.
rm = env.Detect('rm') or 'del'
else:
# Don't use 'rm' if the shell is not sh, because rm won't
# work with the Windows shells (cmd.exe or command.com) or
# Windows path names.
rm = 'del'
if 'TEMPFILEPREFIX' in env:
prefix = env.subst('$TEMPFILEPREFIX')
else:
prefix = '@'
tempfile_esc_func = env.get('TEMPFILEARGESCFUNC', SCons.Subst.quote_spaces)
args = [
tempfile_esc_func(arg)
for arg in cmd[1:]
]
join_char = env.get('TEMPFILEARGJOIN', ' ')
os.write(fd, bytearray(join_char.join(args) + "\n", 'utf-8'))
os.close(fd)
# XXX Using the SCons.Action.print_actions value directly
# like this is bogus, but expedient. This class should
# really be rewritten as an Action that defines the
# __call__() and strfunction() methods and lets the
# normal action-execution logic handle whether or not to
# print/execute the action. The problem, though, is all
# of that is decided before we execute this method as
# part of expanding the $TEMPFILE construction variable.
# Consequently, refactoring this will have to wait until
# we get more flexible with allowing Actions to exist
# independently and get strung together arbitrarily like
# Ant tasks. In the meantime, it's going to be more
# user-friendly to not let obsession with architectural
# purity get in the way of just being helpful, so we'll
# reach into SCons.Action directly.
if SCons.Action.print_actions:
cmdstr = env.subst(self.cmdstr, SCons.Subst.SUBST_RAW, target,
source) if self.cmdstr is not None else ''
# Print our message only if XXXCOMSTR returns an empty string
if len(cmdstr) == 0 :
cmdstr = ("Using tempfile "+native_tmp+" for command line:\n"+
str(cmd[0]) + " " + " ".join(args))
self._print_cmd_str(target, source, env, cmdstr)
cmdlist = [cmd[0], prefix + native_tmp + '\n' + rm, native_tmp]
# Store the temporary file command list into the target Node.attributes
# to avoid creating two temporary files one for print and one for execute.
if node is not None:
try:
# Storing in tempfile_cmdlist by self.cmd provided when intializing
# $TEMPFILE{} fixes issue raised in PR #3140 and #3553
node.attributes.tempfile_cmdlist[cmdlist_key] = cmdlist
except AttributeError:
node.attributes.tempfile_cmdlist = {cmdlist_key: cmdlist}
return cmdlist
[docs] def _print_cmd_str(self, target, source, env, cmdstr):
# check if the user has specified a cmd line print function
print_func = None
try:
get = env.get
except AttributeError:
pass
else:
print_func = get('PRINT_CMD_LINE_FUNC')
# use the default action cmd line print if user did not supply one
if not print_func:
action = SCons.Action._ActionAction()
action.print_cmd_line(cmdstr, target, source, env)
else:
print_func(cmdstr, target, source, env)
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