def win_callback(self,params):
start_time = params['start_time']
end_time = iso8601()
img_in = params['img_in']
tmp_out = params['img_out'] # temporary output file
img_out = params['final_out'] # final output file
process_id = gen_id()
if not os.path.exists(tmp_out):
self.log('FAIL temporary output file does not exist: %s' % tmp_out)
return FAIL
in_md5 = md5_file(img_in)
out_md5 = md5_file(tmp_out)
in_length = os.stat(img_in).st_size
out_length = os.stat(tmp_out).st_size
used = {
'process_id': process_id,
'algorithm_id': '201203_ic', # FIXME uncontrolled
'direction': 'used', # FIXME local id
'pathname': img_in, # FIXME local pathname
'no_earlier_than': start_time,
'no_later_than': end_time,
'fixity_md5': in_md5,
'fixity_length': in_length
}
generated_by = {
'process_id': process_id,
'algorithm_id': '201203_ic', # FIXME uncontrolled
'direction': 'generated by', # FIXME local id
'pathname': img_out, # FIXME local pathname
'no_earlier_than': start_time,
'no_later_than': end_time,
'fixity_md5': out_md5,
'fixity_length': out_length
}
# FIXME emit provenance record
prov_qname = '%s_prov' % self.qname
try:
self.enqueue(json.dumps(used), prov_qname)
self.enqueue(json.dumps(generated_by), prov_qname)
except:
raise JobExit('Failed to enqueue provenance records', FAIL)
try:
os.rename(tmp_out, img_out)
except:
raise JobExit('Cannot move temporary file into place: %s -> %s' % (tmp_out, img_out), FAIL)
return WIN
def fix(self):
"""compute fixity based on pathname"""
now = secs2utcdatetime()
stat = os.stat(self.pathname)
self.length = stat.st_size
self.fix_time = now
self.create_time = secs2utcdatetime(stat.st_ctime)
self.mod_time = secs2utcdatetime(stat.st_mtime)
if self.checksum_type=='md5':
self.checksum = md5_file(self.pathname)
elif self.checksum_type=='sha1':
self.checksum = sha1_file(self.pathname)
def check(self):
"""check fixity against current state of pathname.
failure modes include missing file, non-matching length and checksum."""
if not os.path.exists(self.pathname):
raise FixityException("file not found at location specified in fixity record")
stat = os.stat(self.pathname)
if stat.st_size != self.length:
raise FixityException("file size differs from fixity record")
if self.checksum_type=='md5':
if self.checksum != md5_file(self.pathname):
raise FixityException("md5 checksum does not match fixity record")
elif self.checksum_type=='sha1':
if self.checksum != sha15_file(self.pathname):
raise FixityException("sha-1 checksum does not match fixity record")
