Mercurial > hg > mercurial-crew-with-dirclash
view mercurial/util.py @ 2012:d07c322e0033
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author | TK Soh <teekaysoh@yahoo.com> |
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date | Tue, 28 Mar 2006 19:02:00 +0200 |
parents | a8a618c57690 |
children | 6328445b0e71 |
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""" util.py - Mercurial utility functions and platform specfic implementations Copyright 2005 K. Thananchayan <thananck@yahoo.com> This software may be used and distributed according to the terms of the GNU General Public License, incorporated herein by reference. This contains helper routines that are independent of the SCM core and hide platform-specific details from the core. """ import os, errno from i18n import gettext as _ from demandload import * demandload(globals(), "cStringIO errno popen2 re shutil sys tempfile") demandload(globals(), "threading time") def pipefilter(s, cmd): '''filter string S through command CMD, returning its output''' (pout, pin) = popen2.popen2(cmd, -1, 'b') def writer(): pin.write(s) pin.close() # we should use select instead on UNIX, but this will work on most # systems, including Windows w = threading.Thread(target=writer) w.start() f = pout.read() pout.close() w.join() return f def tempfilter(s, cmd): '''filter string S through a pair of temporary files with CMD. CMD is used as a template to create the real command to be run, with the strings INFILE and OUTFILE replaced by the real names of the temporary files generated.''' inname, outname = None, None try: infd, inname = tempfile.mkstemp(prefix='hgfin') fp = os.fdopen(infd, 'wb') fp.write(s) fp.close() outfd, outname = tempfile.mkstemp(prefix='hgfout') os.close(outfd) cmd = cmd.replace('INFILE', inname) cmd = cmd.replace('OUTFILE', outname) code = os.system(cmd) if code: raise Abort(_("command '%s' failed: %s") % (cmd, explain_exit(code))) return open(outname, 'rb').read() finally: try: if inname: os.unlink(inname) except: pass try: if outname: os.unlink(outname) except: pass filtertable = { 'tempfile:': tempfilter, 'pipe:': pipefilter, } def filter(s, cmd): "filter a string through a command that transforms its input to its output" for name, fn in filtertable.iteritems(): if cmd.startswith(name): return fn(s, cmd[len(name):].lstrip()) return pipefilter(s, cmd) def patch(strip, patchname, ui): """apply the patch <patchname> to the working directory. a list of patched files is returned""" fp = os.popen('patch -p%d < "%s"' % (strip, patchname)) files = {} for line in fp: line = line.rstrip() ui.status("%s\n" % line) if line.startswith('patching file '): pf = parse_patch_output(line) files.setdefault(pf, 1) code = fp.close() if code: raise Abort(_("patch command failed: %s") % explain_exit(code)[0]) return files.keys() def binary(s): """return true if a string is binary data using diff's heuristic""" if s and '\0' in s[:4096]: return True return False def unique(g): """return the uniq elements of iterable g""" seen = {} for f in g: if f not in seen: seen[f] = 1 yield f class Abort(Exception): """Raised if a command needs to print an error and exit.""" def always(fn): return True def never(fn): return False def patkind(name, dflt_pat='glob'): """Split a string into an optional pattern kind prefix and the actual pattern.""" for prefix in 're', 'glob', 'path', 'relglob', 'relpath', 'relre': if name.startswith(prefix + ':'): return name.split(':', 1) return dflt_pat, name def globre(pat, head='^', tail='$'): "convert a glob pattern into a regexp" i, n = 0, len(pat) res = '' group = False def peek(): return i < n and pat[i] while i < n: c = pat[i] i = i+1 if c == '*': if peek() == '*': i += 1 res += '.*' else: res += '[^/]*' elif c == '?': res += '.' elif c == '[': j = i if j < n and pat[j] in '!]': j += 1 while j < n and pat[j] != ']': j += 1 if j >= n: res += '\\[' else: stuff = pat[i:j].replace('\\','\\\\') i = j + 1 if stuff[0] == '!': stuff = '^' + stuff[1:] elif stuff[0] == '^': stuff = '\\' + stuff res = '%s[%s]' % (res, stuff) elif c == '{': group = True res += '(?:' elif c == '}' and group: res += ')' group = False elif c == ',' and group: res += '|' elif c == '\\': p = peek() if p: i += 1 res += re.escape(p) else: res += re.escape(c) else: res += re.escape(c) return head + res + tail _globchars = {'[': 1, '{': 1, '*': 1, '?': 1} def pathto(n1, n2): '''return the relative path from one place to another. this returns a path in the form used by the local filesystem, not hg.''' if not n1: return localpath(n2) a, b = n1.split('/'), n2.split('/') a.reverse() b.reverse() while a and b and a[-1] == b[-1]: a.pop() b.pop() b.reverse() return os.sep.join((['..'] * len(a)) + b) def canonpath(root, cwd, myname): """return the canonical path of myname, given cwd and root""" if root == os.sep: rootsep = os.sep else: rootsep = root + os.sep name = myname if not name.startswith(os.sep): name = os.path.join(root, cwd, name) name = os.path.normpath(name) if name.startswith(rootsep): name = name[len(rootsep):] audit_path(name) return pconvert(name) elif name == root: return '' else: raise Abort('%s not under root' % myname) def matcher(canonroot, cwd='', names=['.'], inc=[], exc=[], head='', src=None): return _matcher(canonroot, cwd, names, inc, exc, head, 'glob', src) def cmdmatcher(canonroot, cwd='', names=['.'], inc=[], exc=[], head='', src=None): if os.name == 'nt': dflt_pat = 'glob' else: dflt_pat = 'relpath' return _matcher(canonroot, cwd, names, inc, exc, head, dflt_pat, src) def _matcher(canonroot, cwd, names, inc, exc, head, dflt_pat, src): """build a function to match a set of file patterns arguments: canonroot - the canonical root of the tree you're matching against cwd - the current working directory, if relevant names - patterns to find inc - patterns to include exc - patterns to exclude head - a regex to prepend to patterns to control whether a match is rooted a pattern is one of: 'glob:<rooted glob>' 're:<rooted regexp>' 'path:<rooted path>' 'relglob:<relative glob>' 'relpath:<relative path>' 'relre:<relative regexp>' '<rooted path or regexp>' returns: a 3-tuple containing - list of explicit non-pattern names passed in - a bool match(filename) function - a bool indicating if any patterns were passed in todo: make head regex a rooted bool """ def contains_glob(name): for c in name: if c in _globchars: return True return False def regex(kind, name, tail): '''convert a pattern into a regular expression''' if kind == 're': return name elif kind == 'path': return '^' + re.escape(name) + '(?:/|$)' elif kind == 'relglob': return head + globre(name, '(?:|.*/)', tail) elif kind == 'relpath': return head + re.escape(name) + tail elif kind == 'relre': if name.startswith('^'): return name return '.*' + name return head + globre(name, '', tail) def matchfn(pats, tail): """build a matching function from a set of patterns""" if not pats: return matches = [] for k, p in pats: try: pat = '(?:%s)' % regex(k, p, tail) matches.append(re.compile(pat).match) except re.error: if src: raise Abort("%s: invalid pattern (%s): %s" % (src, k, p)) else: raise Abort("invalid pattern (%s): %s" % (k, p)) def buildfn(text): for m in matches: r = m(text) if r: return r return buildfn def globprefix(pat): '''return the non-glob prefix of a path, e.g. foo/* -> foo''' root = [] for p in pat.split(os.sep): if contains_glob(p): break root.append(p) return '/'.join(root) pats = [] files = [] roots = [] for kind, name in [patkind(p, dflt_pat) for p in names]: if kind in ('glob', 'relpath'): name = canonpath(canonroot, cwd, name) if name == '': kind, name = 'glob', '**' if kind in ('glob', 'path', 're'): pats.append((kind, name)) if kind == 'glob': root = globprefix(name) if root: roots.append(root) elif kind == 'relpath': files.append((kind, name)) roots.append(name) patmatch = matchfn(pats, '$') or always filematch = matchfn(files, '(?:/|$)') or always incmatch = always if inc: incmatch = matchfn(map(patkind, inc), '(?:/|$)') excmatch = lambda fn: False if exc: excmatch = matchfn(map(patkind, exc), '(?:/|$)') return (roots, lambda fn: (incmatch(fn) and not excmatch(fn) and (fn.endswith('/') or (not pats and not files) or (pats and patmatch(fn)) or (files and filematch(fn)))), (inc or exc or (pats and pats != [('glob', '**')])) and True) def system(cmd, environ={}, cwd=None, onerr=None, errprefix=None): '''enhanced shell command execution. run with environment maybe modified, maybe in different dir. if command fails and onerr is None, return status. if ui object, print error message and return status, else raise onerr object as exception.''' oldenv = {} for k in environ: oldenv[k] = os.environ.get(k) if cwd is not None: oldcwd = os.getcwd() try: for k, v in environ.iteritems(): os.environ[k] = str(v) if cwd is not None and oldcwd != cwd: os.chdir(cwd) rc = os.system(cmd) if rc and onerr: errmsg = '%s %s' % (os.path.basename(cmd.split(None, 1)[0]), explain_exit(rc)[0]) if errprefix: errmsg = '%s: %s' % (errprefix, errmsg) try: onerr.warn(errmsg + '\n') except AttributeError: raise onerr(errmsg) return rc finally: for k, v in oldenv.iteritems(): if v is None: del os.environ[k] else: os.environ[k] = v if cwd is not None and oldcwd != cwd: os.chdir(oldcwd) def rename(src, dst): """forcibly rename a file""" try: os.rename(src, dst) except: os.unlink(dst) os.rename(src, dst) def unlink(f): """unlink and remove the directory if it is empty""" os.unlink(f) # try removing directories that might now be empty try: os.removedirs(os.path.dirname(f)) except: pass def copyfiles(src, dst, hardlink=None): """Copy a directory tree using hardlinks if possible""" if hardlink is None: hardlink = (os.stat(src).st_dev == os.stat(os.path.dirname(dst)).st_dev) if os.path.isdir(src): os.mkdir(dst) for name in os.listdir(src): srcname = os.path.join(src, name) dstname = os.path.join(dst, name) copyfiles(srcname, dstname, hardlink) else: if hardlink: try: os_link(src, dst) except: hardlink = False shutil.copy(src, dst) else: shutil.copy(src, dst) def audit_path(path): """Abort if path contains dangerous components""" parts = os.path.normcase(path).split(os.sep) if (os.path.splitdrive(path)[0] or parts[0] in ('.hg', '') or os.pardir in parts): raise Abort(_("path contains illegal component: %s\n") % path) def opener(base, audit=True): """ return a function that opens files relative to base this function is used to hide the details of COW semantics and remote file access from higher level code. """ p = base audit_p = audit def mktempcopy(name): d, fn = os.path.split(name) fd, temp = tempfile.mkstemp(prefix=fn, dir=d) fp = os.fdopen(fd, "wb") try: fp.write(file(name, "rb").read()) except: try: os.unlink(temp) except: pass raise fp.close() st = os.lstat(name) os.chmod(temp, st.st_mode) return temp class atomicfile(file): """the file will only be copied on close""" def __init__(self, name, mode, atomic=False): self.__name = name self.temp = mktempcopy(name) file.__init__(self, self.temp, mode) def close(self): if not self.closed: file.close(self) rename(self.temp, self.__name) def __del__(self): self.close() def o(path, mode="r", text=False, atomic=False): if audit_p: audit_path(path) f = os.path.join(p, path) if not text: mode += "b" # for that other OS if mode[0] != "r": try: nlink = nlinks(f) except OSError: d = os.path.dirname(f) if not os.path.isdir(d): os.makedirs(d) else: if atomic: return atomicfile(f, mode) if nlink > 1: rename(mktempcopy(f), f) return file(f, mode) return o def _makelock_file(info, pathname): ld = os.open(pathname, os.O_CREAT | os.O_WRONLY | os.O_EXCL) os.write(ld, info) os.close(ld) def _readlock_file(pathname): return file(pathname).read() def nlinks(pathname): """Return number of hardlinks for the given file.""" return os.stat(pathname).st_nlink if hasattr(os, 'link'): os_link = os.link else: def os_link(src, dst): raise OSError(0, _("Hardlinks not supported")) # Platform specific variants if os.name == 'nt': demandload(globals(), "msvcrt") nulldev = 'NUL:' class winstdout: '''stdout on windows misbehaves if sent through a pipe''' def __init__(self, fp): self.fp = fp def __getattr__(self, key): return getattr(self.fp, key) def close(self): try: self.fp.close() except: pass def write(self, s): try: return self.fp.write(s) except IOError, inst: if inst.errno != 0: raise self.close() raise IOError(errno.EPIPE, 'Broken pipe') sys.stdout = winstdout(sys.stdout) def os_rcpath(): '''return default os-specific hgrc search path''' try: import win32api, win32process proc = win32api.GetCurrentProcess() filename = win32process.GetModuleFileNameEx(proc, 0) systemrc = os.path.join(os.path.dirname(filename), 'mercurial.ini') except ImportError: systemrc = r'c:\mercurial\mercurial.ini' return [systemrc, os.path.join(os.path.expanduser('~'), 'mercurial.ini')] def parse_patch_output(output_line): """parses the output produced by patch and returns the file name""" pf = output_line[14:] if pf[0] == '`': pf = pf[1:-1] # Remove the quotes return pf try: # ActivePython can create hard links using win32file module import win32api, win32con, win32file def os_link(src, dst): # NB will only succeed on NTFS win32file.CreateHardLink(dst, src) def nlinks(pathname): """Return number of hardlinks for the given file.""" try: fh = win32file.CreateFile(pathname, win32file.GENERIC_READ, win32file.FILE_SHARE_READ, None, win32file.OPEN_EXISTING, 0, None) res = win32file.GetFileInformationByHandle(fh) fh.Close() return res[7] except: return os.stat(pathname).st_nlink def testpid(pid): '''return False if pid is dead, True if running or not known''' try: win32api.OpenProcess(win32con.PROCESS_QUERY_INFORMATION, False, pid) except: return True except ImportError: def testpid(pid): '''return False if pid dead, True if running or not known''' return True def is_exec(f, last): return last def set_exec(f, mode): pass def set_binary(fd): msvcrt.setmode(fd.fileno(), os.O_BINARY) def pconvert(path): return path.replace("\\", "/") def localpath(path): return path.replace('/', '\\') def normpath(path): return pconvert(os.path.normpath(path)) makelock = _makelock_file readlock = _readlock_file def explain_exit(code): return _("exited with status %d") % code, code else: nulldev = '/dev/null' def rcfiles(path): rcs = [os.path.join(path, 'hgrc')] rcdir = os.path.join(path, 'hgrc.d') try: rcs.extend([os.path.join(rcdir, f) for f in os.listdir(rcdir) if f.endswith(".rc")]) except OSError, inst: pass return rcs def os_rcpath(): '''return default os-specific hgrc search path''' path = [] if len(sys.argv) > 0: path.extend(rcfiles(os.path.dirname(sys.argv[0]) + '/../etc/mercurial')) path.extend(rcfiles('/etc/mercurial')) path.append(os.path.expanduser('~/.hgrc')) path = [os.path.normpath(f) for f in path] return path def parse_patch_output(output_line): """parses the output produced by patch and returns the file name""" pf = output_line[14:] if pf.startswith("'") and pf.endswith("'") and pf.find(" ") >= 0: pf = pf[1:-1] # Remove the quotes return pf def is_exec(f, last): """check whether a file is executable""" return (os.stat(f).st_mode & 0100 != 0) def set_exec(f, mode): s = os.stat(f).st_mode if (s & 0100 != 0) == mode: return if mode: # Turn on +x for every +r bit when making a file executable # and obey umask. umask = os.umask(0) os.umask(umask) os.chmod(f, s | (s & 0444) >> 2 & ~umask) else: os.chmod(f, s & 0666) def set_binary(fd): pass def pconvert(path): return path def localpath(path): return path normpath = os.path.normpath def makelock(info, pathname): try: os.symlink(info, pathname) except OSError, why: if why.errno == errno.EEXIST: raise else: _makelock_file(info, pathname) def readlock(pathname): try: return os.readlink(pathname) except OSError, why: if why.errno == errno.EINVAL: return _readlock_file(pathname) else: raise def testpid(pid): '''return False if pid dead, True if running or not sure''' try: os.kill(pid, 0) return True except OSError, inst: return inst.errno != errno.ESRCH def explain_exit(code): """return a 2-tuple (desc, code) describing a process's status""" if os.WIFEXITED(code): val = os.WEXITSTATUS(code) return _("exited with status %d") % val, val elif os.WIFSIGNALED(code): val = os.WTERMSIG(code) return _("killed by signal %d") % val, val elif os.WIFSTOPPED(code): val = os.WSTOPSIG(code) return _("stopped by signal %d") % val, val raise ValueError(_("invalid exit code")) class chunkbuffer(object): """Allow arbitrary sized chunks of data to be efficiently read from an iterator over chunks of arbitrary size.""" def __init__(self, in_iter, targetsize = 2**16): """in_iter is the iterator that's iterating over the input chunks. targetsize is how big a buffer to try to maintain.""" self.in_iter = iter(in_iter) self.buf = '' self.targetsize = int(targetsize) if self.targetsize <= 0: raise ValueError(_("targetsize must be greater than 0, was %d") % targetsize) self.iterempty = False def fillbuf(self): """Ignore target size; read every chunk from iterator until empty.""" if not self.iterempty: collector = cStringIO.StringIO() collector.write(self.buf) for ch in self.in_iter: collector.write(ch) self.buf = collector.getvalue() self.iterempty = True def read(self, l): """Read L bytes of data from the iterator of chunks of data. Returns less than L bytes if the iterator runs dry.""" if l > len(self.buf) and not self.iterempty: # Clamp to a multiple of self.targetsize targetsize = self.targetsize * ((l // self.targetsize) + 1) collector = cStringIO.StringIO() collector.write(self.buf) collected = len(self.buf) for chunk in self.in_iter: collector.write(chunk) collected += len(chunk) if collected >= targetsize: break if collected < targetsize: self.iterempty = True self.buf = collector.getvalue() s, self.buf = self.buf[:l], buffer(self.buf, l) return s def filechunkiter(f, size = 65536): """Create a generator that produces all the data in the file size (default 65536) bytes at a time. Chunks may be less than size bytes if the chunk is the last chunk in the file, or the file is a socket or some other type of file that sometimes reads less data than is requested.""" s = f.read(size) while len(s) > 0: yield s s = f.read(size) def makedate(): lt = time.localtime() if lt[8] == 1 and time.daylight: tz = time.altzone else: tz = time.timezone return time.mktime(lt), tz def datestr(date=None, format='%a %b %d %H:%M:%S %Y', timezone=True): """represent a (unixtime, offset) tuple as a localized time. unixtime is seconds since the epoch, and offset is the time zone's number of seconds away from UTC. if timezone is false, do not append time zone to string.""" t, tz = date or makedate() s = time.strftime(format, time.gmtime(float(t) - tz)) if timezone: s += " %+03d%02d" % (-tz / 3600, ((-tz % 3600) / 60)) return s def shortuser(user): """Return a short representation of a user name or email address.""" f = user.find('@') if f >= 0: user = user[:f] f = user.find('<') if f >= 0: user = user[f+1:] return user def walkrepos(path): '''yield every hg repository under path, recursively.''' def errhandler(err): if err.filename == path: raise err for root, dirs, files in os.walk(path, onerror=errhandler): for d in dirs: if d == '.hg': yield root dirs[:] = [] break _rcpath = None def rcpath(): '''return hgrc search path. if env var HGRCPATH is set, use it. for each item in path, if directory, use files ending in .rc, else use item. make HGRCPATH empty to only look in .hg/hgrc of current repo. if no HGRCPATH, use default os-specific path.''' global _rcpath if _rcpath is None: if 'HGRCPATH' in os.environ: _rcpath = [] for p in os.environ['HGRCPATH'].split(os.pathsep): if not p: continue if os.path.isdir(p): for f in os.listdir(p): if f.endswith('.rc'): _rcpath.append(os.path.join(p, f)) else: _rcpath.append(p) else: _rcpath = os_rcpath() return _rcpath