def _differs(self, data1, data2, start=0, stop=None):
with open(self._path("file1"), "wb") as f:
f.write(data1.encode("ascii"))
with open(self._path("file2"), "wb") as f:
f.write(data2.encode("ascii"))
return files_differ(self._path("file1"), self._path("file2"), start,
stop)
def _unpack_bootstrap_env(self, target, trn):
"""Unpack the bootstrap env from the given target directory."""
vdir = os.path.basename(target)
# Move new bootrapping environment into main app dir.
# Be sure to move dependencies before executables.
bootstrap = os.path.join(target, ESKY_CONTROL_DIR, "bootstrap")
for nm in self._version_manifest(vdir):
bssrc = os.path.join(bootstrap, nm)
bsdst = os.path.join(self.appdir, nm)
if os.path.exists(bssrc):
# On windows we can't atomically replace files.
# If they differ in a "safe" way we put them aside
# to overwrite at a later time.
if sys.platform == "win32" and os.path.exists(bsdst):
if not files_differ(bssrc, bsdst):
trn.remove(bssrc)
elif esky.winres.is_safe_to_overwrite(bssrc, bsdst):
ovrdir = os.path.join(target, ESKY_CONTROL_DIR)
ovrdir = os.path.join(ovrdir, "overwrite")
if not os.path.exists(ovrdir):
os.mkdir(ovrdir)
trn.move(bssrc, os.path.join(ovrdir, nm))
else:
trn.move(bssrc, bsdst)
else:
trn.move(bssrc, bsdst)
if os.path.isdir(os.path.dirname(bssrc)):
if not os.listdir(os.path.dirname(bssrc)):
trn.remove(os.path.dirname(bssrc))
# Remove the bootstrap dir; the new version is now installed
trn.remove(bootstrap)
def copy(self,source,target):
source = self._check_path(source)
target = self._check_path(target)
if os.path.isdir(source):
if os.path.isdir(target):
s_names = os.listdir(source)
for nm in s_names:
self.copy(os.path.join(source,nm),
os.path.join(target,nm))
for nm in os.listdir(target):
if nm not in s_names:
self._remove(os.path.join(target,nm))
else:
self._copy(source,target)
else:
if os.path.isdir(target) or files_differ(source,target):
self._copy(source,target)
def copy(self,source,target):
source = self._check_path(source)
target = self._check_path(target)
if os.path.isdir(source):
if os.path.isdir(target):
s_names = os.listdir(source)
for nm in s_names:
self.copy(os.path.join(source,nm),
os.path.join(target,nm))
for nm in os.listdir(target):
if nm not in s_names:
self.remove(os.path.join(target,nm))
else:
self.pending.append(("_copy",source,target))
else:
if os.path.isdir(target) or files_differ(source,target):
self.pending.append(("_copy",source,target))
def is_safe_to_overwrite(source,target):
"""Check whether it is safe to overwrite target exe with source exe.
This function checks whether two exe files 'source' and 'target' differ
only in the contents of certain non-critical resource segments. If so,
then overwriting the target file with the contents of the source file
should be safe even in the face of system crashes or power outages; the
worst outcome would be a corrupted resource such as an icon.
"""
if not source.endswith(".exe") or not target.endswith(".exe"):
return False
# Check if they're the same size
s_sz = os.stat(source).st_size
t_sz = os.stat(target).st_size
if s_sz != t_sz:
return False
# Find each safe resource, and confirm that either (1) it's in the same
# location in both executables, or (2) it's missing in both executables.
# TODO: do this by enumerating resources
safe_res = ((RT_VERSION,1),(RT_ICON,1),(RT_ICON,2))
locs = []
for (rtype,rid) in safe_res:
try:
s_loc = find_resource(source,rtype,rid)
except WindowsError:
s_loc = None
try:
t_loc = find_resource(target,rtype,rid)
except WindowsError:
t_loc = None
if s_loc != t_loc:
return False
if s_loc is not None:
locs.append(s_loc)
# Confirm that no other portions of the file have changed
if locs:
locs.extend(((0,0),(s_sz,s_sz)))
locs.sort()
for (_,start),(stop,_) in pairwise(locs):
if files_differ(source,target,start,stop):
return False
# Looks safe to me!
return True
def move(self,source,target):
source = self._check_path(source)
target = self._check_path(target)
if os.path.isdir(source):
if os.path.isdir(target):
s_names = os.listdir(source)
for nm in s_names:
self.move(os.path.join(source,nm),
os.path.join(target,nm))
for nm in os.listdir(target):
if nm not in s_names:
self.remove(os.path.join(target,nm))
self.remove(source)
else:
self.pending.append(("_move",source,target))
else:
if os.path.isdir(target) or files_differ(source,target):
self.pending.append(("_move",source,target))
else:
self.pending.append(("_remove",source))
def is_safe_to_overwrite(source,target):
"""Check whether it is safe to overwrite target exe with source exe.
This function checks whether two exe files 'source' and 'target' differ
only in the contents of certain non-critical resource segments. If so,
then overwriting the target file with the contents of the source file
should be safe even in the face of system crashes or power outages; the
worst outcome would be a corrupted resource such as an icon.
"""
if not source.endswith(".exe") or not target.endswith(".exe"):
return False
# Check if they're the same size
s_sz = os.stat(source).st_size
t_sz = os.stat(target).st_size
if s_sz != t_sz:
return False
# Find each safe resource, and confirm that either (1) it's in the same
# location in both executables, or (2) it's missing in both executables.
locs = []
for (rtype,rid,rlang) in COMMON_SAFE_RESOURCES:
try:
s_loc = find_resource(source,rtype,rid,rlang)
except WindowsError:
s_loc = None
try:
t_loc = find_resource(target,rtype,rid,rlang)
except WindowsError:
t_loc = None
if s_loc != t_loc:
return False
if s_loc is not None:
locs.append(s_loc)
# Confirm that no other portions of the file have changed
if locs:
locs.extend(((0,0),(s_sz,s_sz)))
locs.sort()
for (_,start),(stop,_) in pairwise(locs):
if files_differ(source,target,start,stop):
return False
# Looks safe to me!
return True
def _differs(self, data1, data2, start=0, stop=None):
with open(self._path("file1"), "wb") as f:
f.write(data1.encode("ascii"))
with open(self._path("file2"), "wb") as f:
f.write(data2.encode("ascii"))
return files_differ(self._path("file1"), self._path("file2"), start, stop)
