_, *grep_args, filename = sys.argv

grep_cmd = ['egrep'] + grep_args

gpg_cmd = ['gpg2', '--decrypt', '-o', '-', filename]

fl = open(lock_path, 'wb')

flock(fl, LOCK_EX)

grep_process = None

gpg_process = None

try:

grep_process = Popen(grep_cmd, stdin=PIPE)

gpg_process = Popen(gpg_cmd, stdin=DEVNULL, stdout=PIPE, stderr=DEVNULL)

head = b''

while True:

if grep_process.returncode is not None:

sys.exit('grep command has failed with returncode {}'.format(grep_process.returncode))

if gpg_process.returncode is not None:

sys.exit('GPG command has failed with returncode {}'.format(gpg_process.returncode))

buf = gpg_process.stdout.read(65536)

if buf == b'':

if head == b'':

sys.exit('Nothing received from gpg')

break

if fl is not None:

fl.close()

fl = None

if head is not None:

head += buf

if len(head) < 100:

continue

else:

if head.startswith(b'\xFD7zXZ\x00\x00'):

decompressor = LZMADecompressor()

else:

decompressor = None

buf = head

head = None

if decompressor is not None:

buf = decompressor.decompress(buf)

if decompressor.eof:

assert not decompressor.unused_data

try:

grep_process.stdin.write(buf)

except BrokenPipeError:

sys.exit(1)

gpg_process.wait()

grep_process.stdin.close()

grep_process.wait()

grep_process = None

finally:

if gpg_process:

gpg_process.terminate()

if grep_process:

grep_process.terminate()

if gpg_process:

gpg_process.wait()

if grep_process: