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meson/mesonbuild/mesonlib.py

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# Copyright 2012-2015 The Meson development team
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# http://www.apache.org/licenses/LICENSE-2.0
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""A library of random helper functionality."""
import stat
import platform, subprocess, operator, os, shutil, re
import collections
from glob import glob
class MesonException(Exception):
'''Exceptions thrown by Meson'''
class EnvironmentException(MesonException):
'''Exceptions thrown while processing and creating the build environment'''
class FileMode:
# The first triad is for owner permissions, the second for group permissions,
# and the third for others (everyone else).
# For the 1st character:
# 'r' means can read
# '-' means not allowed
# For the 2nd character:
# 'w' means can write
# '-' means not allowed
# For the 3rd character:
# 'x' means can execute
# 's' means can execute and setuid/setgid is set (owner/group triads only)
# 'S' means cannot execute and setuid/setgid is set (owner/group triads only)
# 't' means can execute and sticky bit is set ("others" triads only)
# 'T' means cannot execute and sticky bit is set ("others" triads only)
# '-' means none of these are allowed
#
# The meanings of 'rwx' perms is not obvious for directories; see:
# https://www.hackinglinuxexposed.com/articles/20030424.html
#
# For information on this notation such as setuid/setgid/sticky bits, see:
# https://en.wikipedia.org/wiki/File_system_permissions#Symbolic_notation
symbolic_perms_regex = re.compile('[r-][w-][xsS-]' # Owner perms
'[r-][w-][xsS-]' # Group perms
'[r-][w-][xtT-]') # Others perms
def __init__(self, perms=None, owner=None, group=None):
self.perms_s = perms
self.perms = self.perms_s_to_bits(perms)
self.owner = owner
self.group = group
def __repr__(self):
ret = '<FileMode: {!r} owner={} group={}'
return ret.format(self.perms_s, self.owner, self.group)
@classmethod
def perms_s_to_bits(cls, perms_s):
'''
Does the opposite of stat.filemode(), converts strings of the form
'rwxr-xr-x' to st_mode enums which can be passed to os.chmod()
'''
if perms_s is None:
# No perms specified, we will not touch the permissions
return -1
eg = 'rwxr-xr-x'
if not isinstance(perms_s, str):
msg = 'Install perms must be a string. For example, {!r}'
raise MesonException(msg.format(eg))
if len(perms_s) != 9 or not cls.symbolic_perms_regex.match(perms_s):
msg = 'File perms {!r} must be exactly 9 chars. For example, {!r}'
raise MesonException(msg.format(perms_s, eg))
perms = 0
# Owner perms
if perms_s[0] == 'r':
perms |= stat.S_IRUSR
if perms_s[1] == 'w':
perms |= stat.S_IWUSR
if perms_s[2] == 'x':
perms |= stat.S_IXUSR
elif perms_s[2] == 'S':
perms |= stat.S_ISUID
elif perms_s[2] == 's':
perms |= stat.S_IXUSR
perms |= stat.S_ISUID
# Group perms
if perms_s[3] == 'r':
perms |= stat.S_IRGRP
if perms_s[4] == 'w':
perms |= stat.S_IWGRP
if perms_s[5] == 'x':
perms |= stat.S_IXGRP
elif perms_s[5] == 'S':
perms |= stat.S_ISGID
elif perms_s[5] == 's':
perms |= stat.S_IXGRP
perms |= stat.S_ISGID
# Others perms
if perms_s[6] == 'r':
perms |= stat.S_IROTH
if perms_s[7] == 'w':
perms |= stat.S_IWOTH
if perms_s[8] == 'x':
perms |= stat.S_IXOTH
elif perms_s[8] == 'T':
perms |= stat.S_ISVTX
elif perms_s[8] == 't':
perms |= stat.S_IXOTH
perms |= stat.S_ISVTX
return perms
class File:
def __init__(self, is_built, subdir, fname):
self.is_built = is_built
self.subdir = subdir
self.fname = fname
assert(isinstance(self.subdir, str))
assert(isinstance(self.fname, str))
def __str__(self):
return self.relative_name()
def __repr__(self):
ret = '<File: {0}'
if not self.is_built:
ret += ' (not built)'
ret += '>'
return ret.format(self.relative_name())
@staticmethod
def from_source_file(source_root, subdir, fname):
if not os.path.isfile(os.path.join(source_root, subdir, fname)):
raise MesonException('File %s does not exist.' % fname)
return File(False, subdir, fname)
@staticmethod
def from_built_file(subdir, fname):
return File(True, subdir, fname)
@staticmethod
def from_absolute_file(fname):
return File(False, '', fname)
def rel_to_builddir(self, build_to_src):
if self.is_built:
return self.relative_name()
else:
return os.path.join(build_to_src, self.subdir, self.fname)
def absolute_path(self, srcdir, builddir):
absdir = srcdir
if self.is_built:
absdir = builddir
return os.path.join(absdir, self.relative_name())
def endswith(self, ending):
return self.fname.endswith(ending)
def split(self, s):
return self.fname.split(s)
def __eq__(self, other):
return (self.fname, self.subdir, self.is_built) == (other.fname, other.subdir, other.is_built)
def __hash__(self):
return hash((self.fname, self.subdir, self.is_built))
def relative_name(self):
return os.path.join(self.subdir, self.fname)
def get_meson_script(env, script):
'''
Given the path of `meson.py`/`meson`, get the path of a meson script such
as `mesonintrospect` or `mesontest`.
'''
meson_py = env.get_build_command()
(base, ext) = os.path.splitext(meson_py)
return os.path.join(os.path.dirname(base), script + ext)
def get_compiler_for_source(compilers, src):
for comp in compilers:
if comp.can_compile(src):
return comp
raise RuntimeError('No specified compiler can handle file {!s}'.format(src))
def classify_unity_sources(compilers, sources):
compsrclist = {}
for src in sources:
comp = get_compiler_for_source(compilers, src)
if comp not in compsrclist:
compsrclist[comp] = [src]
else:
compsrclist[comp].append(src)
return compsrclist
def flatten(item):
if not isinstance(item, list):
return [item]
result = []
for i in item:
if isinstance(i, list):
result += flatten(i)
else:
result.append(i)
return result
def is_osx():
return platform.system().lower() == 'darwin'
def is_linux():
return platform.system().lower() == 'linux'
def is_windows():
platname = platform.system().lower()
return platname == 'windows' or 'mingw' in platname
def is_cygwin():
platname = platform.system().lower()
return platname.startswith('cygwin')
def is_debianlike():
return os.path.isfile('/etc/debian_version')
def exe_exists(arglist):
try:
p = subprocess.Popen(arglist, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
p.communicate()
if p.returncode == 0:
return True
except FileNotFoundError:
pass
return False
def detect_vcs(source_dir):
vcs_systems = [
dict(name = 'git', cmd = 'git', repo_dir = '.git', get_rev = 'git describe --dirty=+', rev_regex = '(.*)', dep = '.git/logs/HEAD'),
dict(name = 'mercurial', cmd = 'hg', repo_dir = '.hg', get_rev = 'hg id -i', rev_regex = '(.*)', dep = '.hg/dirstate'),
dict(name = 'subversion', cmd = 'svn', repo_dir = '.svn', get_rev = 'svn info', rev_regex = 'Revision: (.*)', dep = '.svn/wc.db'),
dict(name = 'bazaar', cmd = 'bzr', repo_dir = '.bzr', get_rev = 'bzr revno', rev_regex = '(.*)', dep = '.bzr'),
]
segs = source_dir.replace('\\', '/').split('/')
for i in range(len(segs), -1, -1):
curdir = '/'.join(segs[:i])
for vcs in vcs_systems:
if os.path.isdir(os.path.join(curdir, vcs['repo_dir'])) and shutil.which(vcs['cmd']):
vcs['wc_dir'] = curdir
return vcs
return None
def grab_leading_numbers(vstr, strict=False):
result = []
for x in vstr.split('.'):
try:
result.append(int(x))
except ValueError as e:
if strict:
msg = 'Invalid version to compare against: {!r}; only ' \
'numeric digits separated by "." are allowed: ' + str(e)
raise MesonException(msg.format(vstr))
break
return result
numpart = re.compile('[0-9.]+')
def version_compare(vstr1, vstr2, strict=False):
match = numpart.match(vstr1.strip())
if match is None:
msg = 'Uncomparable version string {!r}.'
raise MesonException(msg.format(vstr1))
vstr1 = match.group(0)
if vstr2.startswith('>='):
cmpop = operator.ge
vstr2 = vstr2[2:]
elif vstr2.startswith('<='):
cmpop = operator.le
vstr2 = vstr2[2:]
elif vstr2.startswith('!='):
cmpop = operator.ne
vstr2 = vstr2[2:]
elif vstr2.startswith('=='):
cmpop = operator.eq
vstr2 = vstr2[2:]
elif vstr2.startswith('='):
cmpop = operator.eq
vstr2 = vstr2[1:]
elif vstr2.startswith('>'):
cmpop = operator.gt
vstr2 = vstr2[1:]
elif vstr2.startswith('<'):
cmpop = operator.lt
vstr2 = vstr2[1:]
else:
cmpop = operator.eq
varr1 = grab_leading_numbers(vstr1, strict)
varr2 = grab_leading_numbers(vstr2, strict)
return cmpop(varr1, varr2)
def version_compare_many(vstr1, conditions):
if not isinstance(conditions, (list, tuple, frozenset)):
conditions = [conditions]
found = []
not_found = []
for req in conditions:
if not version_compare(vstr1, req, strict=True):
not_found.append(req)
else:
found.append(req)
return not_found == [], not_found, found
def default_libdir():
if is_debianlike():
try:
pc = subprocess.Popen(['dpkg-architecture', '-qDEB_HOST_MULTIARCH'],
stdout=subprocess.PIPE,
stderr=subprocess.DEVNULL)
(stdo, _) = pc.communicate()
if pc.returncode == 0:
archpath = stdo.decode().strip()
return 'lib/' + archpath
except Exception:
pass
if os.path.isdir('/usr/lib64') and not os.path.islink('/usr/lib64'):
return 'lib64'
return 'lib'
def default_libexecdir():
# There is no way to auto-detect this, so it must be set at build time
return 'libexec'
def default_prefix():
return 'c:/' if is_windows() else '/usr/local'
def get_library_dirs():
if is_windows():
return ['C:/mingw/lib'] # Fixme
if is_osx():
return ['/usr/lib'] # Fix me as well.
# The following is probably Debian/Ubuntu specific.
# /usr/local/lib is first because it contains stuff
# installed by the sysadmin and is probably more up-to-date
# than /usr/lib. If you feel that this search order is
# problematic, please raise the issue on the mailing list.
unixdirs = ['/usr/local/lib', '/usr/lib', '/lib']
plat = subprocess.check_output(['uname', '-m']).decode().strip()
# This is a terrible hack. I admit it and I'm really sorry.
# I just don't know what the correct solution is.
if plat == 'i686':
plat = 'i386'
if plat.startswith('arm'):
plat = 'arm'
unixdirs += glob('/usr/lib/' + plat + '*')
if os.path.exists('/usr/lib64'):
unixdirs.append('/usr/lib64')
unixdirs += glob('/lib/' + plat + '*')
if os.path.exists('/lib64'):
unixdirs.append('/lib64')
unixdirs += glob('/lib/' + plat + '*')
return unixdirs
def do_replacement(regex, line, confdata):
match = re.search(regex, line)
while match:
varname = match.group(1)
if varname in confdata:
(var, desc) = confdata.get(varname)
if isinstance(var, str):
pass
elif isinstance(var, int):
var = str(var)
else:
raise RuntimeError('Tried to replace a variable with something other than a string or int.')
else:
var = ''
line = line.replace('@' + varname + '@', var)
match = re.search(regex, line)
return line
def do_mesondefine(line, confdata):
arr = line.split()
if len(arr) != 2:
raise MesonException('#mesondefine does not contain exactly two tokens: %s', line.strip())
varname = arr[1]
try:
(v, desc) = confdata.get(varname)
except KeyError:
return '/* #undef %s */\n' % varname
if isinstance(v, bool):
if v:
return '#define %s\n' % varname
else:
return '#undef %s\n' % varname
elif isinstance(v, int):
return '#define %s %d\n' % (varname, v)
elif isinstance(v, str):
return '#define %s %s\n' % (varname, v)
else:
raise MesonException('#mesondefine argument "%s" is of unknown type.' % varname)
def do_conf_file(src, dst, confdata):
try:
with open(src, encoding='utf-8') as f:
data = f.readlines()
except Exception as e:
raise MesonException('Could not read input file %s: %s' % (src, str(e)))
# Only allow (a-z, A-Z, 0-9, _, -) as valid characters for a define
# Also allow escaping '@' with '\@'
regex = re.compile(r'[^\\]?@([-a-zA-Z0-9_]+)@')
result = []
for line in data:
if line.startswith('#mesondefine'):
line = do_mesondefine(line, confdata)
else:
line = do_replacement(regex, line, confdata)
result.append(line)
dst_tmp = dst + '~'
with open(dst_tmp, 'w', encoding='utf-8') as f:
f.writelines(result)
shutil.copymode(src, dst_tmp)
replace_if_different(dst, dst_tmp)
def dump_conf_header(ofilename, cdata):
with open(ofilename, 'w', encoding='utf-8') as ofile:
ofile.write('''/*
* Autogenerated by the Meson build system.
* Do not edit, your changes will be lost.
*/
#pragma once
''')
for k in sorted(cdata.keys()):
(v, desc) = cdata.get(k)
if desc:
ofile.write('/* %s */\n' % desc)
if isinstance(v, bool):
if v:
ofile.write('#define %s\n\n' % k)
else:
ofile.write('#undef %s\n\n' % k)
elif isinstance(v, (int, str)):
ofile.write('#define %s %s\n\n' % (k, v))
else:
raise MesonException('Unknown data type in configuration file entry: ' + k)
def replace_if_different(dst, dst_tmp):
# If contents are identical, don't touch the file to prevent
# unnecessary rebuilds.
different = True
try:
with open(dst, 'r') as f1, open(dst_tmp, 'r') as f2:
if f1.read() == f2.read():
different = False
except FileNotFoundError:
pass
if different:
os.replace(dst_tmp, dst)
else:
os.unlink(dst_tmp)
def typeslistify(item, types):
'''
Ensure that type(@item) is one of @types or a
list of items all of which are of type @types
'''
if isinstance(item, types):
item = [item]
if not isinstance(item, list):
raise MesonException('Item must be a list or one of {!r}'.format(types))
for i in item:
if i is not None and not isinstance(i, types):
raise MesonException('List item must be one of {!r}'.format(types))
return item
def stringlistify(item):
return typeslistify(item, str)
def expand_arguments(args):
expended_args = []
for arg in args:
if not arg.startswith('@'):
expended_args.append(arg)
continue
args_file = arg[1:]
try:
with open(args_file) as f:
extended_args = f.read().split()
expended_args += extended_args
except Exception as e:
print('Error expanding command line arguments, %s not found' % args_file)
print(e)
return None
return expended_args
def Popen_safe(args, write=None, stderr=subprocess.PIPE, **kwargs):
p = subprocess.Popen(args, universal_newlines=True,
close_fds=False,
stdout=subprocess.PIPE,
stderr=stderr, **kwargs)
o, e = p.communicate(write)
return p, o, e
def commonpath(paths):
'''
For use on Python 3.4 where os.path.commonpath is not available.
We currently use it everywhere so this receives enough testing.
'''
# XXX: Replace me with os.path.commonpath when we start requiring Python 3.5
import pathlib
if not paths:
raise ValueError('arg is an empty sequence')
common = pathlib.PurePath(paths[0])
for path in paths[1:]:
new = []
path = pathlib.PurePath(path)
for c, p in zip(common.parts, path.parts):
if c != p:
break
new.append(c)
# Don't convert '' into '.'
if not new:
common = ''
break
new = os.path.join(*new)
common = pathlib.PurePath(new)
return str(common)
def iter_regexin_iter(regexiter, initer):
'''
Takes each regular expression in @regexiter and tries to search for it in
every item in @initer. If there is a match, returns that match.
Else returns False.
'''
for regex in regexiter:
for ii in initer:
if not isinstance(ii, str):
continue
match = re.search(regex, ii)
if match:
return match.group()
return False
def _substitute_values_check_errors(command, values):
# Error checking
inregex = ('@INPUT([0-9]+)?@', '@PLAINNAME@', '@BASENAME@')
outregex = ('@OUTPUT([0-9]+)?@', '@OUTDIR@')
if '@INPUT@' not in values:
# Error out if any input-derived templates are present in the command
match = iter_regexin_iter(inregex, command)
if match:
m = 'Command cannot have {!r}, since no input files were specified'
raise MesonException(m.format(match))
else:
if len(values['@INPUT@']) > 1:
# Error out if @PLAINNAME@ or @BASENAME@ is present in the command
match = iter_regexin_iter(inregex[1:], command)
if match:
raise MesonException('Command cannot have {!r} when there is '
'more than one input file'.format(match))
# Error out if an invalid @INPUTnn@ template was specified
for each in command:
if not isinstance(each, str):
continue
match = re.search(inregex[0], each)
if match and match.group() not in values:
m = 'Command cannot have {!r} since there are only {!r} inputs'
raise MesonException(m.format(match.group(), len(values['@INPUT@'])))
if '@OUTPUT@' not in values:
# Error out if any output-derived templates are present in the command
match = iter_regexin_iter(outregex, command)
if match:
m = 'Command cannot have {!r} since there are no outputs'
raise MesonException(m.format(match))
else:
# Error out if an invalid @OUTPUTnn@ template was specified
for each in command:
if not isinstance(each, str):
continue
match = re.search(outregex[0], each)
if match and match.group() not in values:
m = 'Command cannot have {!r} since there are only {!r} outputs'
raise MesonException(m.format(match.group(), len(values['@OUTPUT@'])))
def substitute_values(command, values):
'''
Substitute the template strings in the @values dict into the list of
strings @command and return a new list. For a full list of the templates,
see get_filenames_templates_dict()
If multiple inputs/outputs are given in the @values dictionary, we
substitute @INPUT@ and @OUTPUT@ only if they are the entire string, not
just a part of it, and in that case we substitute *all* of them.
'''
# Error checking
_substitute_values_check_errors(command, values)
# Substitution
outcmd = []
for vv in command:
if not isinstance(vv, str):
outcmd.append(vv)
elif '@INPUT@' in vv:
inputs = values['@INPUT@']
if vv == '@INPUT@':
outcmd += inputs
elif len(inputs) == 1:
outcmd.append(vv.replace('@INPUT@', inputs[0]))
else:
raise MesonException("Command has '@INPUT@' as part of a "
"string and more than one input file")
elif '@OUTPUT@' in vv:
outputs = values['@OUTPUT@']
if vv == '@OUTPUT@':
outcmd += outputs
elif len(outputs) == 1:
outcmd.append(vv.replace('@OUTPUT@', outputs[0]))
else:
raise MesonException("Command has '@OUTPUT@' as part of a "
"string and more than one output file")
# Append values that are exactly a template string.
# This is faster than a string replace.
elif vv in values:
outcmd.append(values[vv])
# Substitute everything else with replacement
else:
for key, value in values.items():
if key in ('@INPUT@', '@OUTPUT@'):
# Already done above
continue
vv = vv.replace(key, value)
outcmd.append(vv)
return outcmd
def get_filenames_templates_dict(inputs, outputs):
'''
Create a dictionary with template strings as keys and values as values for
the following templates:
@INPUT@ - the full path to one or more input files, from @inputs
@OUTPUT@ - the full path to one or more output files, from @outputs
@OUTDIR@ - the full path to the directory containing the output files
If there is only one input file, the following keys are also created:
@PLAINNAME@ - the filename of the input file
@BASENAME@ - the filename of the input file with the extension removed
If there is more than one input file, the following keys are also created:
@INPUT0@, @INPUT1@, ... one for each input file
If there is more than one output file, the following keys are also created:
@OUTPUT0@, @OUTPUT1@, ... one for each output file
'''
values = {}
# Gather values derived from the input
if inputs:
# We want to substitute all the inputs.
values['@INPUT@'] = inputs
for (ii, vv) in enumerate(inputs):
# Write out @INPUT0@, @INPUT1@, ...
values['@INPUT{}@'.format(ii)] = vv
if len(inputs) == 1:
# Just one value, substitute @PLAINNAME@ and @BASENAME@
values['@PLAINNAME@'] = plain = os.path.split(inputs[0])[1]
values['@BASENAME@'] = os.path.splitext(plain)[0]
if outputs:
# Gather values derived from the outputs, similar to above.
values['@OUTPUT@'] = outputs
for (ii, vv) in enumerate(outputs):
values['@OUTPUT{}@'.format(ii)] = vv
# Outdir should be the same for all outputs
values['@OUTDIR@'] = os.path.split(outputs[0])[0]
# Many external programs fail on empty arguments.
if values['@OUTDIR@'] == '':
values['@OUTDIR@'] = '.'
return values
class OrderedSet(collections.MutableSet):
"""A set that preserves the order in which items are added, by first
insertion.
"""
def __init__(self, iterable=None):
self.__container = collections.OrderedDict()
if iterable:
self.update(iterable)
def __contains__(self, value):
return value in self.__container
def __iter__(self):
return iter(self.__container.keys())
def __len__(self):
return len(self.__container)
def __repr__(self):
# Don't print 'OrderedSet("")' for an empty set.
if self.__container:
return 'OrderedSet("{}")'.format(
'", "'.join(repr(e) for e in self.__container.keys()))
return 'OrderedSet()'
def add(self, value):
self.__container[value] = None
def discard(self, value):
if value in self.__container:
del self.__container[value]
def update(self, iterable):
for item in iterable:
self.__container[item] = None
def difference(self, set_):
return type(self)(e for e in self if e not in set_)