Package: python3
Version: 3.7.5-1
Severity: normal
Dear maintainer,
I have a Python 3 program that tries to find one of the first lines in a
log file after a certain timestamp. Sometimes something writes garbage
data to the logfile causing my program to get inexplicably lost.
After some investigation i have come up with the following program to
reproduce the problem:
from os import fstat, unlink
from stat import ST_SIZE
fn = "cr-1742ebb0-0172-11ea-b932-0ff8aa5102a4.txt"
with open(fn, "w") as fh:
fh.write("\r")
with open(fn, errors='replace', encoding='utf8') as fh:
print("File size: {}".format(fstat(fh.fileno())[ST_SIZE]))
print(repr(fh.read(1)))
print("{} position after readline: {}".format(type(fh), fh.tell()))
unlink(fn)
Running this program in the docker image debian:experimental after
installing python3 gives the following output:
File size: 1
'\n'
<class '_io.TextIOWrapper'> position after readline:
1461501637671185285124623296198104371161410306049
Where i had expected a position no greater than the file size and
and a character that exists in the file or a replacement marker.
-- System Information:
Debian Release: bullseye/sid
APT prefers unstable
APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Kernel: Linux 4.19.0-6-amd64 (SMP w/8 CPU cores)
Kernel taint flags: TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=C, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE=C (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: unable to detect
Versions of packages python3 depends on:
ii libpython3-stdlib 3.7.5-1
ii python3-minimal 3.7.5-1
ii python3.7 3.7.5-2
python3 recommends no packages.
Versions of packages python3 suggests:
pn python3-doc <none>
pn python3-tk <none>
pn python3-venv <none>
-- no debconf information
