Add support for Aliases (as symlinks)
This commit is contained in:
Elliot Nunn
parent
1d32e45e90
commit
e2cc5b1280
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@ -9,7 +9,17 @@ TEXT_TYPES = [b'TEXT', b'ttro'] # Teach Text read-only
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def _unsyncability(name): # files named '_' reserved for directory Finder info
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return name.endswith(('.rdump', '.idump')) or name.startswith('.') or name == '_'
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if path.splitext(name)[1].lower() in ('.rdump', '.idump'): return True
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if name.startswith('.'): return True
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if name == '_': return True
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if len(name) > 31: return True
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try:
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name.encode('mac_roman')
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except UnicodeEncodeError:
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return True
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return False
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def _fuss_if_unsyncable(name):
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if _unsyncability(name):
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@ -21,6 +31,37 @@ def _try_delete(name):
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except FileNotFoundError:
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pass
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def _symlink_rel(src, dst):
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rel_path_src = path.relpath(src, path.dirname(dst))
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os.symlink(rel_path_src, dst)
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def _get_datafork_paths(base):
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"""Symlinks are NOT GOOD"""
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base = path.abspath(path.realpath(base))
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for dirpath, dirnames, filenames in os.walk(base):
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dirnames[:] = [x for x in dirnames if not _unsyncability(x)]
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filenames[:] = [x for x in filenames if not _unsyncability(x)]
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for kindcode, the_list in ((0, filenames), (1, dirnames)):
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for fname in the_list:
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nativepath = path.join(dirpath, fname)
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hfspath = tuple(_swapsep(c) for c in path.relpath(nativepath, base).split(path.sep))
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hfslink = kindcode # if not a link then default to this
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if path.islink(nativepath):
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nativelink = path.realpath(nativepath)
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if len(path.commonpath((nativelink, base))) < len(base): continue
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hfslink = tuple(_swapsep(c) for c in path.relpath(nativelink, base).split(path.sep))
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if hfslink == (path.relpath('x', 'x'),): hfslink = () # nasty special case
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yield nativepath, hfspath, hfslink
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def _swapsep(n):
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return n.replace(':', path.sep)
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class AbstractFolder(MutableMapping):
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def __init__(self, from_dict=()):
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@ -32,8 +73,12 @@ class AbstractFolder(MutableMapping):
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if isinstance(key, tuple):
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if len(key) == 1:
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self[key[0]] = value
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return
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elif len(key) == 0:
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raise KeyError
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else:
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self[key[0]][key[1:]] = value
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return
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try:
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key = key.decode('mac_roman')
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@ -50,6 +95,8 @@ class AbstractFolder(MutableMapping):
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if isinstance(key, tuple):
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if len(key) == 1:
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return self[key[0]]
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elif len(key) == 0:
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return self
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else:
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return self[key[0]][key[1:]]
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@ -65,8 +112,12 @@ class AbstractFolder(MutableMapping):
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if isinstance(key, tuple):
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if len(key) == 1:
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del self[key[0]]
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return
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elif len(key) == 0:
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raise KeyError
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else:
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del self[key[0]][key[1:]]
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return
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try:
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key = key.decode('mac_roman')
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@ -131,78 +182,57 @@ class AbstractFolder(MutableMapping):
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yield from self[dn]._recursive_walk(my_path=my_path+(dn,), topdown=topdown)
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def read_folder(self, folder_path, date=0, mpw_dates=False):
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def includefilter(n):
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if n.startswith('.'): return False
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if n.endswith('.rdump'): return True
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if n.endswith('.idump'): return True
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return True
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def swapsep(n):
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return n.replace(':', path.sep)
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def mkbasename(n):
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base, ext = path.splitext(n)
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if ext in ('.rdump', '.idump'):
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return base
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else:
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return n
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self.crdate = self.mddate = self.bkdate = date
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tmptree = {folder_path: self}
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deferred_aliases = []
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for nativepath, hfspath, hfslink in _get_datafork_paths(folder_path):
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if hfslink == 0: # file
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thefile = File(); self[hfspath] = thefile
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thefile.crdate = thefile.mddate = thefile.bkdate = date
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for dirpath, dirnames, filenames in os.walk(folder_path):
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dirnames[:] = [swapsep(x) for x in dirnames if includefilter(x)]
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filenames[:] = [swapsep(x) for x in filenames if includefilter(x)]
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for dn in dirnames:
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_fuss_if_unsyncable(dn)
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newdir = Folder()
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newdir.crdate = newdir.mddate = newdir.bkdate = date
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tmptree[dirpath][dn] = newdir
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tmptree[path.join(dirpath, dn)] = newdir
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for fn in filenames:
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basename = mkbasename(fn)
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_fuss_if_unsyncable(basename)
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fullbase = path.join(dirpath, basename)
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fullpath = path.join(dirpath, fn)
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if mpw_dates: thefile.real_t = 0
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try:
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thefile = tmptree[fullbase]
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except KeyError:
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thefile = File()
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thefile.real_t = 0 # for the MPW hack
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thefile.crdate = thefile.mddate = thefile.bkdate = date
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thefile.contributors = []
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tmptree[fullbase] = thefile
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if fn.endswith('.idump'):
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with open(fullpath, 'rb') as f:
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with open(nativepath + '.idump', 'rb') as f:
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if mpw_dates: thefile.real_t = max(thefile.real_t, path.getmtime(f.name))
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thefile.type = f.read(4)
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thefile.creator = f.read(4)
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elif fn.endswith('rdump'):
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rez = open(fullpath, 'rb').read()
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resources = parse_rez_code(rez)
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resfork = make_file(resources, align=4)
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thefile.rsrc = resfork
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else:
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thefile.data = open(fullpath, 'rb').read()
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except FileNotFoundError:
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pass
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thefile.contributors.append(fullpath)
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if mpw_dates:
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thefile.real_t = max(thefile.real_t, path.getmtime(fullpath))
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try:
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with open(nativepath + '.rdump', 'rb') as f:
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if mpw_dates: thefile.real_t = max(thefile.real_t, path.getmtime(f.name))
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thefile.rsrc = make_file(parse_rez_code(f.read()), align=4)
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except FileNotFoundError:
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pass
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tmptree[dirpath][basename] = thefile
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with open(nativepath, 'rb') as f:
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if mpw_dates: thefile.real_t = max(thefile.real_t, path.getmtime(f.name))
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thefile.data = f.read()
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for pathtpl, obj in self.iter_paths():
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if thefile.type in TEXT_TYPES:
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thefile.data = thefile.data.replace(b'\r\n', b'\r').replace(b'\n', b'\r')
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try:
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thefile.data = thefile.data.decode('utf8').encode('mac_roman')
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except UnicodeEncodeError:
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pass # not happy, but whatever...
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elif hfslink == 1: # folder
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thedir = Folder(); self[hfspath] = thedir
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thedir.crdate = thedir.mddate = thedir.bkdate = date
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else: # symlink, i.e. alias
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deferred_aliases.append((hfspath, hfslink)) # alias, targetpath
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for aliaspath, targetpath in deferred_aliases:
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try:
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if obj.type in TEXT_TYPES:
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obj.data = obj.data.decode('utf8').replace('\r\n', '\r').replace('\n', '\r').encode('mac_roman')
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except AttributeError:
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pass
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alias = File()
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alias.flags |= 0x8000
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alias.aliastarget = self[targetpath]
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self[aliaspath] = alias
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except (KeyError, ValueError):
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raise
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if mpw_dates:
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all_real_times = set()
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@ -231,6 +261,8 @@ class AbstractFolder(MutableMapping):
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written = []
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blacklist = list()
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alias_fixups = list()
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valid_alias_targets = dict()
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for p, obj in self.iter_paths():
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blacklist_test = ':'.join(p) + ':'
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if blacklist_test.startswith(tuple(blacklist)): continue
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@ -243,10 +275,15 @@ class AbstractFolder(MutableMapping):
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info_path = nativepath + '.idump'
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rsrc_path = nativepath + '.rdump'
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valid_alias_targets[id(obj)] = nativepath
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if isinstance(obj, Folder):
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os.makedirs(nativepath, exist_ok=True)
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elif obj.mddate != obj.bkdate or not any_exists(nativepath):
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if obj.aliastarget is not None:
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alias_fixups.append((nativepath, id(obj.aliastarget)))
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# always write the data fork
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data = obj.data
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if obj.type in TEXT_TYPES:
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@ -275,6 +312,21 @@ class AbstractFolder(MutableMapping):
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for w in written:
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os.utime(w, (t, t))
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for alias_path, target_id in alias_fixups:
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try:
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target_path = valid_alias_targets[target_id]
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except KeyError:
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pass
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else:
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_try_delete(alias_path)
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_try_delete(alias_path + '.idump')
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_try_delete(alias_path + '.rdump')
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_symlink_rel(target_path, alias_path)
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for ext in ('.idump', '.rdump'):
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if path.exists(target_path + ext):
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_symlink_rel(target_path + ext, alias_path + ext)
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class Folder(AbstractFolder):
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def __init__(self):
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@ -298,10 +350,17 @@ class File:
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self.locked = False
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self.crdate = self.mddate = self.bkdate = 0
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self.aliastarget = None
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self.rsrc = bytearray()
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self.data = bytearray()
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def __str__(self):
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if isinstance(self.aliastarget, File):
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return '[alias] ' + str(self.aliastarget)
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elif self.aliastarget is not None:
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return '[alias to folder]'
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typestr, creatorstr = (x.decode('mac_roman') for x in (self.type, self.creator))
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dstr, rstr = (repr(bytes(x)) if 1 <= len(x) <= 32 else '%db' % len(x) for x in (self.data, self.rsrc))
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return '[%s/%s] data=%s rsrc=%s' % (typestr, creatorstr, dstr, rstr)
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172
machfs/main.py
172
machfs/main.py
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@ -99,6 +99,85 @@ def _bb_name(name):
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return bitmanip.pstring(_encode_name(name)).ljust(16)
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def _common_prefix(*tuples):
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for i in range(min(len(t) for t in tuples)):
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for t in tuples[1:]:
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if t[i] != tuples[0][i]:
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return i
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return 0
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def _link_aliases(vol_cr_date, cnid_dict): # vol creation date confirms within-volume alias
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for cnid, obj in cnid_dict.items():
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try:
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if obj.flags & 0x8000:
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alis_rsrc = next(r.data for r in parse_file(obj.rsrc) if r.type == b'alis')
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# print(hex(obj.flags))
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# print(obj)
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# open('/tmp/interpreting' + hex(cnid),'wb').write(alis_rsrc)
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userType, aliasSize, aliasVersion, \
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thisAliasKind, volumeName, volumeCrDate, \
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volumeSig, volumeType, parDirID, fileName, \
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fileNum, fileCrDate, fileType, fdCreator, \
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nlvlFrom, nlvlTo, volumeAttributes, volumeFSID \
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= struct.unpack_from('>4s H hh 28p L 2s hL 64p LL 4s4s HHLh', alis_rsrc)
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# print(userType, aliasSize, aliasVersion,
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# thisAliasKind, volumeName, volumeCrDate,
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# volumeSig, volumeType, parDirID, fileName,
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# fileNum, fileCrDate, fileType, fdCreator,
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# nlvlFrom, nlvlTo, volumeAttributes, volumeFSID)
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if volumeCrDate != vol_cr_date: raise ValueError
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obj.aliastarget = cnid_dict[fileNum]
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except (AttributeError, KeyError, StopIteration, ValueError):
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pass
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def _defer_special_files(iter_paths):
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"""Defer special files (aliases) to late CNIDs, and resolve aliases"""
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approved_dict = dict()
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unapproved = []
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for path, obj in iter_paths:
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if isinstance(obj, File) and obj.aliastarget is not None:
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unapproved.append((path, obj))
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else:
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yield path, obj, None
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approved_dict[id(obj)] = path
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while unapproved:
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made_progress = False
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for i in reversed(range(len(unapproved))):
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path, obj = unapproved[i]
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try:
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targetpath = approved_dict[id(obj.aliastarget)]
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except KeyError:
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continue
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yield path, obj, targetpath
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approved_dict[id(obj)] = path
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unapproved.pop(i)
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made_progress = True
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if not made_progress: break
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def _alis_append(alis, kind, data):
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if len(alis) % 2: alis.append(0)
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alis.extend(struct.pack('>hH', kind, len(data)))
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alis.extend(data)
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if len(alis) % 2: alis.append(0)
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class _TempWrapper:
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"""Volume uses this to store metadata while serialising"""
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def __init__(self, of):
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@ -225,6 +304,8 @@ class Volume(AbstractFolder):
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self.pop('Desktop DB', None)
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self.pop('Desktop DF', None)
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_link_aliases(drCrDate, cnids)
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def write(self, size=800*1024, align=512, desktopdb=True, bootable=True, startapp=None, sparse=False):
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if align < 512 or align % 512:
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raise ValueError('align must be multiple of 512')
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@ -232,7 +313,11 @@ class Volume(AbstractFolder):
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if size < 400 * 1024 or size % 512:
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raise ValueError('size must be a multiple of 512b and >= 400K')
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# These are declared up here because they are needed for aliases
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drVN = _encode_name(self.name, 'vol')
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drSigWord = b'BD'
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drAtrb = 1<<8 # volume attributes (hwlock, swlock, CLEANUNMOUNT, badblocks)
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drCrDate, drLsMod, drVolBkUp = self.crdate, self.mddate, self.bkdate
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# overall layout:
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# 1. two boot blocks (offset=0)
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@ -306,7 +391,7 @@ class Volume(AbstractFolder):
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path2wrap = {(): godwrap, (self.name,): topwrap}
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drNxtCNID = 16
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for path, obj in self.iter_paths():
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for path, obj, aliastarget in _defer_special_files(self.iter_paths()):
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path = (self.name,) + path
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wrap = _TempWrapper(obj)
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path2wrap[path] = wrap
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@ -338,15 +423,83 @@ class Volume(AbstractFolder):
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if isinstance(obj, File) and startapp and path[1:] == tuple(startapp):
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startapp_folder_cnid = path2wrap[path[:-1]].cnid
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if isinstance(obj, File):
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wrap.data, wrap.rsrc = obj.data, obj.rsrc
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wrap.type, wrap.creator = obj.type, obj.creator
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# This is the place to manage your special files (aliases for now)
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if aliastarget is not None:
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aliastarget = (self.name,) + aliastarget # match the convention for this function
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targetobj = path2wrap[aliastarget].of # probe the target to set some metadata
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if isinstance(targetobj, Folder):
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wrap.creator = b'MACS'
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wrap.type = b'fdrp'
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elif isinstance(targetobj, Volume):
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wrap.creator = b'MACS'
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wrap.type = b'hdsk' if size > 1440*1024 else b'flpy'
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elif isinstance(targetobj, File):
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wrap.creator = targetobj.creator
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if targetobj.type == b'APPL':
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wrap.type = b'adrp'
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else:
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wrap.type = targetobj.type
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wrap.data = b''
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userType = b''
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aliasSize = 9999 # fill this short at offset 4
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aliasVersion = 2
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thisAliasKind = 1 if isinstance(targetobj, Folder) else 0
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volumeName = drVN
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volumeCrDate = drCrDate
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volumeSig = drSigWord
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volumeType = 5 #2 if size == 400*1024 else 3 if size == 800*1024 else 4 if size == 1440*1024 else 1
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parDirID = path2wrap[aliastarget[:-1]].cnid
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fileName = _encode_name(aliastarget[-1])
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fileNum = path2wrap[aliastarget].cnid
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fileCrDate = path2wrap[aliastarget].of.crdate
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fileType = targetobj.type if isinstance(targetobj, File) else b''
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fdCreator = targetobj.creator if isinstance(targetobj, File) else b''
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nlvlFrom = len(path) - _common_prefix(path, aliastarget)
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nlvlTo = len(aliastarget) - _common_prefix(path, aliastarget)
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volumeAttributes = 0 # this is aliasmgr-specific
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volumeFSID = 0
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|
||||
# Stress test: find file by name, not CNID
|
||||
# fileNum = 0
|
||||
|
||||
alis = Resource(b'alis', 0, name=path[-1])
|
||||
alis.data[:] = struct.pack('>4s H hh 28p L 2s hL 64p LL 4s4s HHLh',
|
||||
userType, aliasSize, aliasVersion, \
|
||||
thisAliasKind, volumeName, volumeCrDate, \
|
||||
volumeSig, volumeType, parDirID, fileName, \
|
||||
fileNum, fileCrDate, fileType, fdCreator, \
|
||||
nlvlFrom, nlvlTo, volumeAttributes, volumeFSID \
|
||||
) + bytes(10) # reserved stuff
|
||||
|
||||
_alis_append(alis.data, 0, aliastarget[-2].encode('mac_roman'))
|
||||
_alis_append(alis.data, 2, ':'.join(aliastarget).encode('mac_roman'))
|
||||
_alis_append(alis.data, -1, b'')
|
||||
|
||||
struct.pack_into('>H', alis.data, 4, len(alis.data))
|
||||
|
||||
# open('/tmp/creating','wb').write(alis.data)
|
||||
|
||||
wrap.rsrc = make_file([alis])
|
||||
|
||||
if isinstance(obj, File):
|
||||
wrap.dfrk = wrap.rfrk = (0, 0)
|
||||
if obj.data:
|
||||
if wrap.data:
|
||||
pre = len(blkaccum)
|
||||
accumulate(bitmanip.chunkify(obj.data, drAlBlkSiz))
|
||||
accumulate(bitmanip.chunkify(wrap.data, drAlBlkSiz))
|
||||
wrap.dfrk = (pre, len(blkaccum)-pre)
|
||||
if obj.rsrc:
|
||||
if wrap.rsrc:
|
||||
pre = len(blkaccum)
|
||||
accumulate(bitmanip.chunkify(obj.rsrc, drAlBlkSiz))
|
||||
accumulate(bitmanip.chunkify(wrap.rsrc, drAlBlkSiz))
|
||||
wrap.rfrk = (pre, len(blkaccum)-pre)
|
||||
|
||||
self._prefdict = root_dict_backup
|
||||
|
|
@ -370,10 +523,10 @@ class Volume(AbstractFolder):
|
|||
cdrType = 2
|
||||
filFlags = 1 << 1 # file thread record exists, but is not locked, nor "file record is used"
|
||||
filTyp = 0
|
||||
filUsrWds = struct.pack('>4s4sHHHxxxxxx', obj.type, obj.creator, obj.flags, obj.x, obj.y)
|
||||
filUsrWds = struct.pack('>4s4sHHHxxxxxx', wrap.type, wrap.creator, obj.flags, obj.x, obj.y)
|
||||
filFlNum = wrap.cnid
|
||||
filStBlk, filLgLen, filPyLen = wrap.dfrk[0], len(obj.data), bitmanip.pad_up(len(obj.data), drAlBlkSiz)
|
||||
filRStBlk, filRLgLen, filRPyLen = wrap.rfrk[0], len(obj.rsrc), bitmanip.pad_up(len(obj.rsrc), drAlBlkSiz)
|
||||
filStBlk, filLgLen, filPyLen = wrap.dfrk[0], len(wrap.data), bitmanip.pad_up(len(wrap.data), drAlBlkSiz)
|
||||
filRStBlk, filRLgLen, filRPyLen = wrap.rfrk[0], len(wrap.rsrc), bitmanip.pad_up(len(wrap.rsrc), drAlBlkSiz)
|
||||
filCrDat, filMdDat, filBkDat = obj.crdate, obj.mddate, obj.bkdate
|
||||
filFndrInfo = bytes(16) # todo must fix
|
||||
filClpSize = 0 # todo must fix
|
||||
|
|
@ -438,7 +591,6 @@ class Volume(AbstractFolder):
|
|||
startapp_folder_cnid = 0
|
||||
|
||||
# Create the Volume Information Block
|
||||
drSigWord = b'BD'
|
||||
drNmFls = sum(isinstance(x, File) for x in self.values())
|
||||
drNmRtDirs = sum(not isinstance(x, File) for x in self.values())
|
||||
drVBMSt = 3 # first block of volume bitmap
|
||||
|
|
@ -448,11 +600,9 @@ class Volume(AbstractFolder):
|
|||
drFreeBks = drNmAlBlks - len(blkaccum)
|
||||
drWrCnt = 0 # ????volume write count
|
||||
drVCSize = drVBMCSize = drCtlCSize = 0
|
||||
drAtrb = 1<<8 # volume attributes (hwlock, swlock, CLEANUNMOUNT, badblocks)
|
||||
drVolBkUp = 0 # date and time of last backup
|
||||
drVSeqNum = 0 # volume backup sequence number
|
||||
drFndrInfo = struct.pack('>LLL28x', system_folder_cnid, startapp_folder_cnid, startapp_folder_cnid)
|
||||
drCrDate, drLsMod, drVolBkUp = self.crdate, self.mddate, self.bkdate
|
||||
|
||||
vib = struct.pack('>2sLLHHHHHLLHLH28pLHLLLHLL32sHHHLHHxxxxxxxxLHHxxxxxxxx',
|
||||
drSigWord, drCrDate, drLsMod, drAtrb, drNmFls,
|
||||
|
|
|
|||
Loading…
Reference in New Issue