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"""distutils.command.build_scripts
Implements the Distutils 'build_scripts' command."""
import os
import re
from stat import ST_MODE
from distutils import sysconfig
from ..core import Command
from ..dep_util import newer
from ..util import convert_path
from distutils._log import log
import tokenize
shebang_pattern = re.compile('^#!.*python[0-9.]*([ \t].*)?$')
"""
Pattern matching a Python interpreter indicated in first line of a script.
"""
# for Setuptools compatibility
first_line_re = shebang_pattern
class build_scripts(Command):
description = "\"build\" scripts (copy and fixup #! line)"
user_options = [
('build-dir=', 'd', "directory to \"build\" (copy) to"),
('force', 'f', "forcibly build everything (ignore file timestamps"),
('executable=', 'e', "specify final destination interpreter path"),
]
boolean_options = ['force']
def initialize_options(self):
self.build_dir = None
self.scripts = None
self.force = None
self.executable = None
def finalize_options(self):
self.set_undefined_options(
'build',
('build_scripts', 'build_dir'),
('force', 'force'),
('executable', 'executable'),
)
self.scripts = self.distribution.scripts
def get_source_files(self):
return self.scripts
def run(self):
if not self.scripts:
return
self.copy_scripts()
def copy_scripts(self):
"""
Copy each script listed in ``self.scripts``.
If a script is marked as a Python script (first line matches
'shebang_pattern', i.e. starts with ``#!`` and contains
"python"), then adjust in the copy the first line to refer to
the current Python interpreter.
"""
self.mkpath(self.build_dir)
outfiles = []
updated_files = []
for script in self.scripts:
self._copy_script(script, outfiles, updated_files)
self._change_modes(outfiles)
return outfiles, updated_files
def _copy_script(self, script, outfiles, updated_files): # noqa: C901
shebang_match = None
script = convert_path(script)
outfile = os.path.join(self.build_dir, os.path.basename(script))
outfiles.append(outfile)
if not self.force and not newer(script, outfile):
log.debug("not copying %s (up-to-date)", script)
return
# Always open the file, but ignore failures in dry-run mode
# in order to attempt to copy directly.
try:
f = tokenize.open(script)
except OSError:
if not self.dry_run:
raise
f = None
else:
first_line = f.readline()
if not first_line:
self.warn("%s is an empty file (skipping)" % script)
return
shebang_match = shebang_pattern.match(first_line)
updated_files.append(outfile)
if shebang_match:
log.info("copying and adjusting %s -> %s", script, self.build_dir)
if not self.dry_run:
if not sysconfig.python_build:
executable = self.executable
else:
executable = os.path.join(
sysconfig.get_config_var("BINDIR"),
"python%s%s"
% (
sysconfig.get_config_var("VERSION"),
sysconfig.get_config_var("EXE"),
),
)
post_interp = shebang_match.group(1) or ''
shebang = "#!" + executable + post_interp + "\n"
self._validate_shebang(shebang, f.encoding)
with open(outfile, "w", encoding=f.encoding) as outf:
outf.write(shebang)
outf.writelines(f.readlines())
if f:
f.close()
else:
if f:
f.close()
self.copy_file(script, outfile)
def _change_modes(self, outfiles):
if os.name != 'posix':
return
for file in outfiles:
self._change_mode(file)
def _change_mode(self, file):
if self.dry_run:
log.info("changing mode of %s", file)
return
oldmode = os.stat(file)[ST_MODE] & 0o7777
newmode = (oldmode | 0o555) & 0o7777
if newmode != oldmode:
log.info("changing mode of %s from %o to %o", file, oldmode, newmode)
os.chmod(file, newmode)
@staticmethod
def _validate_shebang(shebang, encoding):
# Python parser starts to read a script using UTF-8 until
# it gets a #coding:xxx cookie. The shebang has to be the
# first line of a file, the #coding:xxx cookie cannot be
# written before. So the shebang has to be encodable to
# UTF-8.
try:
shebang.encode('utf-8')
except UnicodeEncodeError:
raise ValueError(
"The shebang ({!r}) is not encodable " "to utf-8".format(shebang)
)
# If the script is encoded to a custom encoding (use a
# #coding:xxx cookie), the shebang has to be encodable to
# the script encoding too.
try:
shebang.encode(encoding)
except UnicodeEncodeError:
raise ValueError(
"The shebang ({!r}) is not encodable "
"to the script encoding ({})".format(shebang, encoding)
)
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