Mercurial > hg
view tests/hghave.py @ 46378:8b02f132adf6
test: unquiet few tests to demonstrate changes in upcoming patches
Upcoming patches will skip revlog cloning for share-safe upgrades.
Differential Revision: https://phab.mercurial-scm.org/D9773
author | Pulkit Goyal <7895pulkit@gmail.com> |
---|---|
date | Thu, 14 Jan 2021 17:27:54 +0530 |
parents | e5e6282fa66a |
children | 66e8e279133b |
line wrap: on
line source
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"), "known-bad-output": (lambda: True, "use for currently known bad output"), "missing-correct-output": (lambda: False, "use for missing good output"), } 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 _sys2bytes(p): if p is None: return p return p.encode('utf-8') def _bytes2sys(p): if p is None: return p return p.decode('utf-8') else: def _sys2bytes(p): return p _bytes2sys = _sys2bytes 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))) _hgversion = None def gethgversion(): global _hgversion if _hgversion is None: _hgversion = _gethgversion() return _hgversion @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("rust", "Using the Rust extensions") def has_rust(): """Check is the mercurial currently running is using some rust code""" cmd = 'hg debuginstall --quiet 2>&1' match = br'checking module policy \(([^)]+)\)' policy = matchoutput(cmd, match) if not policy: return False return b'rust' in policy.group(1) @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))) @check("pygit2", "pygit2 Python library") def has_git(): try: import pygit2 pygit2.Oid # silence unused import return True except ImportError: return False # 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(_sys2bytes(fn), _sys2bytes(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(): try: import pyflakes pyflakes.__version__ except ImportError: return False else: return 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 10.x and 11.x return m and int(m.group(1)) >= 11 @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("pygments25", "Pygments version >= 2.5") def pygments25(): try: import pygments v = pygments.__version__ except ImportError: return False parts = v.split(".") major = int(parts[0]) minor = int(parts[1]) return (major, minor) >= (2, 5) @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("defaultcacertsloaded", "detected presence of loaded system CA certs") def has_defaultcacertsloaded(): import ssl from mercurial import sslutil, ui as uimod 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("setprocname", "whether osutil.setprocname is available or not") def has_setprocname(): try: from mercurial.utils import procutil procutil.setprocname return True except AttributeError: return False @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("curses", "terminfo compiler and curses module") def has_curses(): try: import curses curses.COLOR_BLUE # Windows doesn't have a `tic` executable, but the windows_curses # package is sufficient to run the tests without it. if os.name == 'nt': return True return has_tic() except (ImportError, AttributeError): return False @check("tic", "terminfo compiler") def has_tic(): return matchoutput('test -x "`which tic`"', br'') @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", "virtualenv support") def has_virtualenv(): try: import virtualenv # --no-site-package became the default in 1.7 (Nov 2011), and the # argument was removed in 20.0 (Feb 2020). Rather than make the # script complicated, just ignore ancient versions. return int(virtualenv.__version__.split('.')[0]) > 1 except (AttributeError, ImportError, IndexError): 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 and matching cli 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(_bytes2sys(version.group(1))) >= sv('20.8b1') @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(_bytes2sys(version.group(0))) >= sv('2019.10.17') @check("rustfmt", "rustfmt tool at version nightly-2020-10-04") def has_rustfmt(): # We use Nightly's rustfmt due to current unstable config options. return matchoutput( '`rustup which --toolchain nightly-2020-10-04 rustfmt` --version', b'rustfmt', ) @check("cargo", "cargo tool") def has_cargo(): return matchoutput('`rustup which cargo` --version', b'cargo') @check("lzma", "python lzma module") def has_lzma(): try: import _lzma _lzma.FORMAT_XZ return True except ImportError: return False