from __future__ import absolute_import, print_function
import distutils.version
import os
import re
import socket
import stat
import subprocess
import sys
import tempfile
tempprefix = 'hg-hghave-'
checks = {
"true": (lambda: True, "yak shaving"),
"false": (lambda: False, "nail clipper"),
}
try:
import msvcrt
msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY)
msvcrt.setmode(sys.stderr.fileno(), os.O_BINARY)
except ImportError:
pass
stdout = getattr(sys.stdout, 'buffer', sys.stdout)
stderr = getattr(sys.stderr, 'buffer', sys.stderr)
if sys.version_info[0] >= 3:
def _bytespath(p):
if p is None:
return p
return p.encode('utf-8')
def _strpath(p):
if p is None:
return p
return p.decode('utf-8')
else:
def _bytespath(p):
return p
_strpath = _bytespath
def check(name, desc):
"""Registers a check function for a feature."""
def decorator(func):
checks[name] = (func, desc)
return func
return decorator
def checkvers(name, desc, vers):
"""Registers a check function for each of a series of versions.
vers can be a list or an iterator.
Produces a series of feature checks that have the form <name><vers> without
any punctuation (even if there's punctuation in 'vers'; i.e. this produces
'py38', not 'py3.8' or 'py-38')."""
def decorator(func):
def funcv(v):
def f():
return func(v)
return f
for v in vers:
v = str(v)
f = funcv(v)
checks['%s%s' % (name, v.replace('.', ''))] = (f, desc % v)
return func
return decorator
def checkfeatures(features):
result = {
'error': [],
'missing': [],
'skipped': [],
}
for feature in features:
negate = feature.startswith('no-')
if negate:
feature = feature[3:]
if feature not in checks:
result['missing'].append(feature)
continue
check, desc = checks[feature]
try:
available = check()
except Exception:
result['error'].append('hghave check failed: %s' % feature)
continue
if not negate and not available:
result['skipped'].append('missing feature: %s' % desc)
elif negate and available:
result['skipped'].append('system supports %s' % desc)
return result
def require(features):
"""Require that features are available, exiting if not."""
result = checkfeatures(features)
for missing in result['missing']:
stderr.write(
('skipped: unknown feature: %s\n' % missing).encode('utf-8')
)
for msg in result['skipped']:
stderr.write(('skipped: %s\n' % msg).encode('utf-8'))
for msg in result['error']:
stderr.write(('%s\n' % msg).encode('utf-8'))
if result['missing']:
sys.exit(2)
if result['skipped'] or result['error']:
sys.exit(1)
def matchoutput(cmd, regexp, ignorestatus=False):
"""Return the match object if cmd executes successfully and its output
is matched by the supplied regular expression.
"""
r = re.compile(regexp)
p = subprocess.Popen(
cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT
)
s = p.communicate()[0]
ret = p.returncode
return (ignorestatus or not ret) and r.search(s)
@check("baz", "GNU Arch baz client")
def has_baz():
return matchoutput('baz --version 2>&1', br'baz Bazaar version')
@check("bzr", "Canonical's Bazaar client")
def has_bzr():
try:
import bzrlib
import bzrlib.bzrdir
import bzrlib.errors
import bzrlib.revision
import bzrlib.revisionspec
bzrlib.revisionspec.RevisionSpec
return bzrlib.__doc__ is not None
except (AttributeError, ImportError):
return False
@checkvers("bzr", "Canonical's Bazaar client >= %s", (1.14,))
def has_bzr_range(v):
major, minor = v.split('rc')[0].split('.')[0:2]
try:
import bzrlib
return bzrlib.__doc__ is not None and bzrlib.version_info[:2] >= (
int(major),
int(minor),
)
except ImportError:
return False
@check("chg", "running with chg")
def has_chg():
return 'CHGHG' in os.environ
@check("cvs", "cvs client/server")
def has_cvs():
re = br'Concurrent Versions System.*?server'
return matchoutput('cvs --version 2>&1', re) and not has_msys()
@check("cvs112", "cvs client/server 1.12.* (not cvsnt)")
def has_cvs112():
re = br'Concurrent Versions System \(CVS\) 1.12.*?server'
return matchoutput('cvs --version 2>&1', re) and not has_msys()
@check("cvsnt", "cvsnt client/server")
def has_cvsnt():
re = br'Concurrent Versions System \(CVSNT\) (\d+).(\d+).*\(client/server\)'
return matchoutput('cvsnt --version 2>&1', re)
@check("darcs", "darcs client")
def has_darcs():
return matchoutput('darcs --version', br'\b2\.([2-9]|\d{2})', True)
@check("mtn", "monotone client (>= 1.0)")
def has_mtn():
return matchoutput('mtn --version', br'monotone', True) and not matchoutput(
'mtn --version', br'monotone 0\.', True
)
@check("eol-in-paths", "end-of-lines in paths")
def has_eol_in_paths():
try:
fd, path = tempfile.mkstemp(dir='.', prefix=tempprefix, suffix='\n\r')
os.close(fd)
os.remove(path)
return True
except (IOError, OSError):
return False
@check("execbit", "executable bit")
def has_executablebit():
try:
EXECFLAGS = stat.S_IXUSR | stat.S_IXGRP | stat.S_IXOTH
fh, fn = tempfile.mkstemp(dir='.', prefix=tempprefix)
try:
os.close(fh)
m = os.stat(fn).st_mode & 0o777
new_file_has_exec = m & EXECFLAGS
os.chmod(fn, m ^ EXECFLAGS)
exec_flags_cannot_flip = (os.stat(fn).st_mode & 0o777) == m
finally:
os.unlink(fn)
except (IOError, OSError):
# we don't care, the user probably won't be able to commit anyway
return False
return not (new_file_has_exec or exec_flags_cannot_flip)
@check("icasefs", "case insensitive file system")
def has_icasefs():
# Stolen from mercurial.util
fd, path = tempfile.mkstemp(dir='.', prefix=tempprefix)
os.close(fd)
try:
s1 = os.stat(path)
d, b = os.path.split(path)
p2 = os.path.join(d, b.upper())
if path == p2:
p2 = os.path.join(d, b.lower())
try:
s2 = os.stat(p2)
return s2 == s1
except OSError:
return False
finally:
os.remove(path)
@check("fifo", "named pipes")
def has_fifo():
if getattr(os, "mkfifo", None) is None:
return False
name = tempfile.mktemp(dir='.', prefix=tempprefix)
try:
os.mkfifo(name)
os.unlink(name)
return True
except OSError:
return False
@check("killdaemons", 'killdaemons.py support')
def has_killdaemons():
return True
@check("cacheable", "cacheable filesystem")
def has_cacheable_fs():
from mercurial import util
fd, path = tempfile.mkstemp(dir='.', prefix=tempprefix)
os.close(fd)
try:
return util.cachestat(path).cacheable()
finally:
os.remove(path)
@check("lsprof", "python lsprof module")
def has_lsprof():
try:
import _lsprof
_lsprof.Profiler # silence unused import warning
return True
except ImportError:
return False
def gethgversion():
m = matchoutput('hg --version --quiet 2>&1', br'(\d+)\.(\d+)')
if not m:
return (0, 0)
return (int(m.group(1)), int(m.group(2)))
@checkvers(
"hg", "Mercurial >= %s", list([(1.0 * x) / 10 for x in range(9, 99)])
)
def has_hg_range(v):
major, minor = v.split('.')[0:2]
return gethgversion() >= (int(major), int(minor))
@check("hg08", "Mercurial >= 0.8")
def has_hg08():
if checks["hg09"][0]():
return True
return matchoutput('hg help annotate 2>&1', '--date')
@check("hg07", "Mercurial >= 0.7")
def has_hg07():
if checks["hg08"][0]():
return True
return matchoutput('hg --version --quiet 2>&1', 'Mercurial Distributed SCM')
@check("hg06", "Mercurial >= 0.6")
def has_hg06():
if checks["hg07"][0]():
return True
return matchoutput('hg --version --quiet 2>&1', 'Mercurial version')
@check("gettext", "GNU Gettext (msgfmt)")
def has_gettext():
return matchoutput('msgfmt --version', br'GNU gettext-tools')
@check("git", "git command line client")
def has_git():
return matchoutput('git --version 2>&1', br'^git version')
def getgitversion():
m = matchoutput('git --version 2>&1', br'git version (\d+)\.(\d+)')
if not m:
return (0, 0)
return (int(m.group(1)), int(m.group(2)))
# https://github.com/git-lfs/lfs-test-server
@check("lfs-test-server", "git-lfs test server")
def has_lfsserver():
exe = 'lfs-test-server'
if has_windows():
exe = 'lfs-test-server.exe'
return any(
os.access(os.path.join(path, exe), os.X_OK)
for path in os.environ["PATH"].split(os.pathsep)
)
@checkvers("git", "git client (with ext::sh support) version >= %s", (1.9,))
def has_git_range(v):
major, minor = v.split('.')[0:2]
return getgitversion() >= (int(major), int(minor))
@check("docutils", "Docutils text processing library")
def has_docutils():
try:
import docutils.core
docutils.core.publish_cmdline # silence unused import
return True
except ImportError:
return False
def getsvnversion():
m = matchoutput('svn --version --quiet 2>&1', br'^(\d+)\.(\d+)')
if not m:
return (0, 0)
return (int(m.group(1)), int(m.group(2)))
@checkvers("svn", "subversion client and admin tools >= %s", (1.3, 1.5))
def has_svn_range(v):
major, minor = v.split('.')[0:2]
return getsvnversion() >= (int(major), int(minor))
@check("svn", "subversion client and admin tools")
def has_svn():
return matchoutput('svn --version 2>&1', br'^svn, version') and matchoutput(
'svnadmin --version 2>&1', br'^svnadmin, version'
)
@check("svn-bindings", "subversion python bindings")
def has_svn_bindings():
try:
import svn.core
version = svn.core.SVN_VER_MAJOR, svn.core.SVN_VER_MINOR
if version < (1, 4):
return False
return True
except ImportError:
return False
@check("p4", "Perforce server and client")
def has_p4():
return matchoutput('p4 -V', br'Rev\. P4/') and matchoutput(
'p4d -V', br'Rev\. P4D/'
)
@check("symlink", "symbolic links")
def has_symlink():
# mercurial.windows.checklink() is a hard 'no' at the moment
if os.name == 'nt' or getattr(os, "symlink", None) is None:
return False
name = tempfile.mktemp(dir='.', prefix=tempprefix)
try:
os.symlink(".", name)
os.unlink(name)
return True
except (OSError, AttributeError):
return False
@check("hardlink", "hardlinks")
def has_hardlink():
from mercurial import util
fh, fn = tempfile.mkstemp(dir='.', prefix=tempprefix)
os.close(fh)
name = tempfile.mktemp(dir='.', prefix=tempprefix)
try:
util.oslink(_bytespath(fn), _bytespath(name))
os.unlink(name)
return True
except OSError:
return False
finally:
os.unlink(fn)
@check("hardlink-whitelisted", "hardlinks on whitelisted filesystems")
def has_hardlink_whitelisted():
from mercurial import util
try:
fstype = util.getfstype(b'.')
except OSError:
return False
return fstype in util._hardlinkfswhitelist
@check("rmcwd", "can remove current working directory")
def has_rmcwd():
ocwd = os.getcwd()
temp = tempfile.mkdtemp(dir='.', prefix=tempprefix)
try:
os.chdir(temp)
# On Linux, 'rmdir .' isn't allowed, but the other names are okay.
# On Solaris and Windows, the cwd can't be removed by any names.
os.rmdir(os.getcwd())
return True
except OSError:
return False
finally:
os.chdir(ocwd)
# clean up temp dir on platforms where cwd can't be removed
try:
os.rmdir(temp)
except OSError:
pass
@check("tla", "GNU Arch tla client")
def has_tla():
return matchoutput('tla --version 2>&1', br'The GNU Arch Revision')
@check("gpg", "gpg client")
def has_gpg():
return matchoutput('gpg --version 2>&1', br'GnuPG')
@check("gpg2", "gpg client v2")
def has_gpg2():
return matchoutput('gpg --version 2>&1', br'GnuPG[^0-9]+2\.')
@check("gpg21", "gpg client v2.1+")
def has_gpg21():
return matchoutput('gpg --version 2>&1', br'GnuPG[^0-9]+2\.(?!0)')
@check("unix-permissions", "unix-style permissions")
def has_unix_permissions():
d = tempfile.mkdtemp(dir='.', prefix=tempprefix)
try:
fname = os.path.join(d, 'foo')
for umask in (0o77, 0o07, 0o22):
os.umask(umask)
f = open(fname, 'w')
f.close()
mode = os.stat(fname).st_mode
os.unlink(fname)
if mode & 0o777 != ~umask & 0o666:
return False
return True
finally:
os.rmdir(d)
@check("unix-socket", "AF_UNIX socket family")
def has_unix_socket():
return getattr(socket, 'AF_UNIX', None) is not None
@check("root", "root permissions")
def has_root():
return getattr(os, 'geteuid', None) and os.geteuid() == 0
@check("pyflakes", "Pyflakes python linter")
def has_pyflakes():
return matchoutput(
"sh -c \"echo 'import re' 2>&1 | pyflakes\"",
br"<stdin>:1: 're' imported but unused",
True,
)
@check("pylint", "Pylint python linter")
def has_pylint():
return matchoutput("pylint --help", br"Usage: pylint", True)
@check("clang-format", "clang-format C code formatter")
def has_clang_format():
m = matchoutput('clang-format --version', br'clang-format version (\d)')
# style changed somewhere between 4.x and 6.x
return m and int(m.group(1)) >= 6
@check("jshint", "JSHint static code analysis tool")
def has_jshint():
return matchoutput("jshint --version 2>&1", br"jshint v")
@check("pygments", "Pygments source highlighting library")
def has_pygments():
try:
import pygments
pygments.highlight # silence unused import warning
return True
except ImportError:
return False
@check("outer-repo", "outer repo")
def has_outer_repo():
# failing for other reasons than 'no repo' imply that there is a repo
return not matchoutput('hg root 2>&1', br'abort: no repository found', True)
@check("ssl", "ssl module available")
def has_ssl():
try:
import ssl
ssl.CERT_NONE
return True
except ImportError:
return False
@check("sslcontext", "python >= 2.7.9 ssl")
def has_sslcontext():
try:
import ssl
ssl.SSLContext
return True
except (ImportError, AttributeError):
return False
@check("defaultcacerts", "can verify SSL certs by system's CA certs store")
def has_defaultcacerts():
from mercurial import sslutil, ui as uimod
ui = uimod.ui.load()
return sslutil._defaultcacerts(ui) or sslutil._canloaddefaultcerts
@check("defaultcacertsloaded", "detected presence of loaded system CA certs")
def has_defaultcacertsloaded():
import ssl
from mercurial import sslutil, ui as uimod
if not has_defaultcacerts():
return False
if not has_sslcontext():
return False
ui = uimod.ui.load()
cafile = sslutil._defaultcacerts(ui)
ctx = ssl.create_default_context()
if cafile:
ctx.load_verify_locations(cafile=cafile)
else:
ctx.load_default_certs()
return len(ctx.get_ca_certs()) > 0
@check("tls1.2", "TLS 1.2 protocol support")
def has_tls1_2():
from mercurial import sslutil
return b'tls1.2' in sslutil.supportedprotocols
@check("windows", "Windows")
def has_windows():
return os.name == 'nt'
@check("system-sh", "system() uses sh")
def has_system_sh():
return os.name != 'nt'
@check("serve", "platform and python can manage 'hg serve -d'")
def has_serve():
return True
@check("test-repo", "running tests from repository")
def has_test_repo():
t = os.environ["TESTDIR"]
return os.path.isdir(os.path.join(t, "..", ".hg"))
@check("tic", "terminfo compiler and curses module")
def has_tic():
try:
import curses
curses.COLOR_BLUE
return matchoutput('test -x "`which tic`"', br'')
except ImportError:
return False
@check("xz", "xz compression utility")
def has_xz():
# When Windows invokes a subprocess in shell mode, it uses `cmd.exe`, which
# only knows `where`, not `which`. So invoke MSYS shell explicitly.
return matchoutput("sh -c 'test -x \"`which xz`\"'", b'')
@check("msys", "Windows with MSYS")
def has_msys():
return os.getenv('MSYSTEM')
@check("aix", "AIX")
def has_aix():
return sys.platform.startswith("aix")
@check("osx", "OS X")
def has_osx():
return sys.platform == 'darwin'
@check("osxpackaging", "OS X packaging tools")
def has_osxpackaging():
try:
return (
matchoutput('pkgbuild', br'Usage: pkgbuild ', ignorestatus=1)
and matchoutput(
'productbuild', br'Usage: productbuild ', ignorestatus=1
)
and matchoutput('lsbom', br'Usage: lsbom', ignorestatus=1)
and matchoutput('xar --help', br'Usage: xar', ignorestatus=1)
)
except ImportError:
return False
@check('linuxormacos', 'Linux or MacOS')
def has_linuxormacos():
# This isn't a perfect test for MacOS. But it is sufficient for our needs.
return sys.platform.startswith(('linux', 'darwin'))
@check("docker", "docker support")
def has_docker():
pat = br'A self-sufficient runtime for'
if matchoutput('docker --help', pat):
if 'linux' not in sys.platform:
# TODO: in theory we should be able to test docker-based
# package creation on non-linux using boot2docker, but in
# practice that requires extra coordination to make sure
# $TESTTEMP is going to be visible at the same path to the
# boot2docker VM. If we figure out how to verify that, we
# can use the following instead of just saying False:
# return 'DOCKER_HOST' in os.environ
return False
return True
return False
@check("debhelper", "debian packaging tools")
def has_debhelper():
# Some versions of dpkg say `dpkg', some say 'dpkg' (` vs ' on the first
# quote), so just accept anything in that spot.
dpkg = matchoutput(
'dpkg --version', br"Debian .dpkg' package management program"
)
dh = matchoutput(
'dh --help', br'dh is a part of debhelper.', ignorestatus=True
)
dh_py2 = matchoutput(
'dh_python2 --help', br'other supported Python versions'
)
# debuild comes from the 'devscripts' package, though you might want
# the 'build-debs' package instead, which has a dependency on devscripts.
debuild = matchoutput(
'debuild --help', br'to run debian/rules with given parameter'
)
return dpkg and dh and dh_py2 and debuild
@check(
"debdeps", "debian build dependencies (run dpkg-checkbuilddeps in contrib/)"
)
def has_debdeps():
# just check exit status (ignoring output)
path = '%s/../contrib/packaging/debian/control' % os.environ['TESTDIR']
return matchoutput('dpkg-checkbuilddeps %s' % path, br'')
@check("demandimport", "demandimport enabled")
def has_demandimport():
# chg disables demandimport intentionally for performance wins.
return (not has_chg()) and os.environ.get('HGDEMANDIMPORT') != 'disable'
# Add "py27", "py35", ... as possible feature checks. Note that there's no
# punctuation here.
@checkvers("py", "Python >= %s", (2.7, 3.5, 3.6, 3.7, 3.8, 3.9))
def has_python_range(v):
major, minor = v.split('.')[0:2]
py_major, py_minor = sys.version_info.major, sys.version_info.minor
return (py_major, py_minor) >= (int(major), int(minor))
@check("py3", "running with Python 3.x")
def has_py3():
return 3 == sys.version_info[0]
@check("py3exe", "a Python 3.x interpreter is available")
def has_python3exe():
return matchoutput('python3 -V', br'^Python 3.(5|6|7|8|9)')
@check("pure", "running with pure Python code")
def has_pure():
return any(
[
os.environ.get("HGMODULEPOLICY") == "py",
os.environ.get("HGTEST_RUN_TESTS_PURE") == "--pure",
]
)
@check("slow", "allow slow tests (use --allow-slow-tests)")
def has_slow():
return os.environ.get('HGTEST_SLOW') == 'slow'
@check("hypothesis", "Hypothesis automated test generation")
def has_hypothesis():
try:
import hypothesis
hypothesis.given
return True
except ImportError:
return False
@check("unziplinks", "unzip(1) understands and extracts symlinks")
def unzip_understands_symlinks():
return matchoutput('unzip --help', br'Info-ZIP')
@check("zstd", "zstd Python module available")
def has_zstd():
try:
import mercurial.zstd
mercurial.zstd.__version__
return True
except ImportError:
return False
@check("devfull", "/dev/full special file")
def has_dev_full():
return os.path.exists('/dev/full')
@check("ensurepip", "ensurepip module")
def has_ensurepip():
try:
import ensurepip
ensurepip.bootstrap
return True
except ImportError:
return False
@check("virtualenv", "Python virtualenv support")
def has_virtualenv():
try:
import virtualenv
virtualenv.ACTIVATE_SH
return True
except ImportError:
return False
@check("fsmonitor", "running tests with fsmonitor")
def has_fsmonitor():
return 'HGFSMONITOR_TESTS' in os.environ
@check("fuzzywuzzy", "Fuzzy string matching library")
def has_fuzzywuzzy():
try:
import fuzzywuzzy
fuzzywuzzy.__version__
return True
except ImportError:
return False
@check("clang-libfuzzer", "clang new enough to include libfuzzer")
def has_clang_libfuzzer():
mat = matchoutput('clang --version', br'clang version (\d)')
if mat:
# libfuzzer is new in clang 6
return int(mat.group(1)) > 5
return False
@check("clang-6.0", "clang 6.0 with version suffix (libfuzzer included)")
def has_clang60():
return matchoutput('clang-6.0 --version', br'clang version 6\.')
@check("xdiff", "xdiff algorithm")
def has_xdiff():
try:
from mercurial import policy
bdiff = policy.importmod('bdiff')
return bdiff.xdiffblocks(b'', b'') == [(0, 0, 0, 0)]
except (ImportError, AttributeError):
return False
@check('extraextensions', 'whether tests are running with extra extensions')
def has_extraextensions():
return 'HGTESTEXTRAEXTENSIONS' in os.environ
def getrepofeatures():
"""Obtain set of repository features in use.
HGREPOFEATURES can be used to define or remove features. It contains
a space-delimited list of feature strings. Strings beginning with ``-``
mean to remove.
"""
# Default list provided by core.
features = {
'bundlerepo',
'revlogstore',
'fncache',
}
# Features that imply other features.
implies = {
'simplestore': ['-revlogstore', '-bundlerepo', '-fncache'],
}
for override in os.environ.get('HGREPOFEATURES', '').split(' '):
if not override:
continue
if override.startswith('-'):
if override[1:] in features:
features.remove(override[1:])
else:
features.add(override)
for imply in implies.get(override, []):
if imply.startswith('-'):
if imply[1:] in features:
features.remove(imply[1:])
else:
features.add(imply)
return features
@check('reporevlogstore', 'repository using the default revlog store')
def has_reporevlogstore():
return 'revlogstore' in getrepofeatures()
@check('reposimplestore', 'repository using simple storage extension')
def has_reposimplestore():
return 'simplestore' in getrepofeatures()
@check('repobundlerepo', 'whether we can open bundle files as repos')
def has_repobundlerepo():
return 'bundlerepo' in getrepofeatures()
@check('repofncache', 'repository has an fncache')
def has_repofncache():
return 'fncache' in getrepofeatures()
@check('sqlite', 'sqlite3 module is available')
def has_sqlite():
try:
import sqlite3
version = sqlite3.sqlite_version_info
except ImportError:
return False
if version < (3, 8, 3):
# WITH clause not supported
return False
return matchoutput('sqlite3 -version', br'^3\.\d+')
@check('vcr', 'vcr http mocking library')
def has_vcr():
try:
import vcr
vcr.VCR
return True
except (ImportError, AttributeError):
pass
return False
@check('emacs', 'GNU Emacs')
def has_emacs():
# Our emacs lisp uses `with-eval-after-load` which is new in emacs
# 24.4, so we allow emacs 24.4, 24.5, and 25+ (24.5 was the last
# 24 release)
return matchoutput('emacs --version', b'GNU Emacs 2(4.4|4.5|5|6|7|8|9)')
@check('black', 'the black formatter for python')
def has_black():
blackcmd = 'black --version'
version_regex = b'black, version ([0-9a-b.]+)'
version = matchoutput(blackcmd, version_regex)
sv = distutils.version.StrictVersion
return version and sv(_strpath(version.group(1))) >= sv('19.10b0')
@check('pytype', 'the pytype type checker')
def has_pytype():
pytypecmd = 'pytype --version'
version = matchoutput(pytypecmd, b'[0-9a-b.]+')
sv = distutils.version.StrictVersion
return version and sv(_strpath(version.group(0))) >= sv('2019.10.17')
@check("rustfmt", "rustfmt tool")
def has_rustfmt():
# We use Nightly's rustfmt due to current unstable config options.
return matchoutput(
'`rustup which --toolchain nightly rustfmt` --version', b'rustfmt'
)