mercurial: comparison tests/hghave.py

equal deleted inserted replaced

-:c5dc122fdc2b
+:59338f956109
-from __future__ import absolute_import
+from __future__ import absolute_import, print_function
 import os
 import re
 import socket
 import stat
 "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"""
+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': [],
 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'
+stderr.write(
-% missing).encode('utf-8'))
+('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)
+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)))
+return bzrlib.__doc__ is not None and bzrlib.version_info[:2] >= (
-except ImportError:
+int(major),
-return False
+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)
+'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
 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)
+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)
 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)
 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)
 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
+_lsprof.Profiler  # silence unused import warning
-except ImportError:
+return True
-return False
+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)]))
+@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'
 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
+docutils.core.publish_cmdline  # silence unused import
-except ImportError:
+return True
-return False
+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
+return matchoutput('svn --version 2>&1', br'^svn, version') and matchoutput(
-matchoutput('svnadmin --version 2>&1', br'^svnadmin, version'))
+'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
+return matchoutput('p4 -V', br'Rev\. P4/') and matchoutput(
-matchoutput('p4d -V', br'Rev\. P4D/'))
+'p4d -V', br'Rev\. P4D/'
+)
 @check("symlink", "symbolic links")
 def has_symlink():
 if getattr(os, "symlink", None) is None:
 return False
 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))
 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.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:
 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\"",
+return matchoutput(
-br"<stdin>:1: 're' imported but unused",
+"sh -c \"echo 'import re' 2>&1 | pyflakes\"",
-True)
+br"<stdin>:1: 're' imported but unused",
+True,
+)
 @check("pylint", "Pylint python linter")
 def has_pylint():
-return matchoutput("pylint --help",
+return matchoutput("pylint --help", br"Usage:  pylint", True)
-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
+pygments.highlight  # silence unused import warning
-except ImportError:
+return True
-return False
+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',
+return not matchoutput('hg root 2>&1', br'abort: no repository found', True)
-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
 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("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)
+return (
-and matchoutput(
+matchoutput('pkgbuild', br'Usage: pkgbuild ', ignorestatus=1)
-'productbuild', br'Usage: productbuild ',
+and matchoutput(
-ignorestatus=1)
+'productbuild', br'Usage: productbuild ', ignorestatus=1
-and matchoutput('lsbom', br'Usage: lsbom', ignorestatus=1)
+)
-and matchoutput(
+and matchoutput('lsbom', br'Usage: lsbom', ignorestatus=1)
-'xar --help', br'Usage: xar', ignorestatus=1))
+and matchoutput('xar --help', br'Usage: xar', ignorestatus=1)
-except ImportError:
+)
-return False
+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):
 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',
+dpkg = matchoutput(
-br"Debian .dpkg' package management program")
+'dpkg --version', br"Debian .dpkg' package management program"
-dh = matchoutput('dh --help',
+)
-br'dh is a part of debhelper.', ignorestatus=True)
+dh = matchoutput(
-dh_py2 = matchoutput('dh_python2 --help',
+'dh --help', br'dh is a part of debhelper.', ignorestatus=True
-br'other supported Python versions')
+)
+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',
+debuild = matchoutput(
-br'to run debian/rules with given parameter')
+'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/)")
+@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')
+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([
+return any(
-os.environ.get("HGMODULEPOLICY") == "py",
+[
-os.environ.get("HGTEST_RUN_TESTS_PURE") == "--pure",
+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("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
 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')
+@check('grey', 'grey, the fork of the black formatter for python')
+def has_black():
+# use that to actual black as soon as possible
+# blackcmd = 'black --version'
+blackcmd = 'python3 $RUNTESTDIR/../contrib/grey.py --version'
+# version_regex = b'black, version \d'
+version_regex = b'grey.py, version \d'
+return matchoutput(blackcmd, version_regex)

branch	stable
changeset 43306	59338f956109
parent 43194	138ac8cbce60
child 43347	abb95b6f79d3