def _verify(self, file_location, target, all_chksums=True, handlers=None):
"""
Internal function for derivatives.
Digs through chksums, and either returns None, or throws an
errors.FetchFailed exception.
- -2: file doesn't exist.
- -1: if (size chksum is available, and
file is smaller than stated chksum)
- 0: if all chksums match
- 1: if file is too large (if size chksums are available)
or else size is right but a chksum didn't match.
if all_chksums is True, all chksums must be verified; if false, all
a handler can be found for are used.
"""
nondefault_handlers = handlers
if handlers is None:
try:
handlers = get_handlers(target.chksums)
except KeyError:
compatibility.raise_from(
errors.FetchFailed(
file_location,
"Couldn't find a required checksum handler"))
if all_chksums:
missing = set(target.chksums).difference(handlers)
if missing:
raise errors.RequiredChksumDataMissing(target,
*sorted(missing))
if "size" in handlers:
val = handlers["size"](file_location)
if val == -1:
raise errors.MissingDistfile(file_location)
c = cmp(val, target.chksums["size"])
if c:
resumable = (c < 0)
if resumable:
msg = "File is too small."
else:
msg = "File is too big."
raise errors.FetchFailed(file_location,
msg,
resumable=resumable)
elif not os.path.exists(file_location):
raise errors.MissingDistfile(file_location)
elif not os.stat(file_location).st_size:
raise errors.FetchFailed(file_location,
'file is empty',
resumable=False)
chfs = set(target.chksums).intersection(handlers)
chfs.discard("size")
chfs = list(chfs)
if nondefault_handlers:
for x in chfs:
val = handlers[x](file_location)
if val != target.chksums[x]:
raise errors.FetchFailed(
file_location,
"Validation handler %s: expected %s, got %s" %
(x, target.chksums[x], val))
else:
desired_vals = [target.chksums[x] for x in chfs]
calced = get_chksums(file_location, *chfs)
for desired, got, chf in zip(desired_vals, calced, chfs):
if desired != got:
raise errors.FetchFailed(
file_location,
"Validation handler %s: expected %s, got %s" %
(chf, desired, got))
def _verify(self, file_location, target, all_chksums=True, handlers=None):
"""Internal function for derivatives.
Digs through chksums, and either returns None, or throws an
errors.FetchFailed exception.
- -2: file doesn't exist.
- -1: if (size chksum is available, and
file is smaller than stated chksum)
- 0: if all chksums match
- 1: if file is too large (if size chksums are available)
or else size is right but a chksum didn't match.
if all_chksums is True, all chksums must be verified; if false, all
a handler can be found for are used.
"""
nondefault_handlers = handlers
if handlers is None:
try:
handlers = get_handlers(target.chksums)
except MissingChksumHandler as e:
raise errors.MissingChksumHandler(
f'missing required checksum handler: {e}')
if all_chksums:
missing = set(target.chksums).difference(handlers)
if missing:
raise errors.RequiredChksumDataMissing(target,
*sorted(missing))
if "size" in handlers:
val = handlers["size"](file_location)
if val == -1:
raise errors.MissingDistfile(file_location)
if val != target.chksums["size"]:
if val < target.chksums["size"]:
raise errors.FetchFailed(file_location,
'file is too small',
resumable=True)
raise errors.ChksumFailure(file_location,
chksum='size',
expected=target.chksums["size"],
value=val)
elif not os.path.exists(file_location):
raise errors.MissingDistfile(file_location)
elif not os.stat(file_location).st_size:
raise errors.FetchFailed(file_location,
'file is empty',
resumable=False)
chfs = set(target.chksums).intersection(handlers)
chfs.discard("size")
chfs = list(chfs)
if nondefault_handlers:
for x in chfs:
val = handlers[x](file_location)
if val != target.chksums[x]:
raise errors.ChksumFailure(file_location,
chksum=x,
expected=target.chksums[x],
value=val)
else:
desired_vals = [target.chksums[x] for x in chfs]
calced = get_chksums(file_location, *chfs)
for desired, got, chf in zip(desired_vals, calced, chfs):
if desired != got:
raise errors.ChksumFailure(file_location,
chksum=chf,
expected=desired,
value=got)