Package: debocker
Version: 0.2.6
Severity: important
Tags: patch
Dear Maintainer,
I encountered an error while using debocker in conjunction with the recommended
version of docker.io. When attempting to run debocker build on a package, the
process fails with the message: "Error: cannot parse logs (build failed?)".
After analyzing the source code, I identified two root causes related to
changes in Docker's CLI output:
Line 476: The docker build command outputs its log to the standard error
(stderr) stream instead of standard output (stdout). The current code, which
uses tee, does not handle this correctly, leading to incomplete log capture.
Line 479: The pattern used to detect a successful build is outdated.
Docker's output format for a successfully built image has changed from
'Successfully built <image_id>' to 'writing image <hash_algorithm>:<hash>
done'. The current script fails to recognize this new pattern, incorrectly
assuming the build has failed.
The proposed patch addresses both issues. While the fix works for the current
Docker version, it should be noted that the solution for line 479 (parsing the
success message) is not universal and might require updates if Docker's output
format changes again.
-- System Information:
Debian Release: 13.1
APT prefers stable-updates
APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable')
Architecture: amd64 (x86_64)
Kernel: Linux 6.12.43+deb13-amd64 (SMP w/6 CPU threads; PREEMPT)
Kernel taint flags: TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=ru_RU.UTF-8, LC_CTYPE=ru_RU.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled
Versions of packages debocker depends on:
ii python3 3.13.5-1
ii python3-click 8.2.0+0.really.8.1.8-1
ii python3-debian 1.0.1
Versions of packages debocker recommends:
ii docker.io 26.1.5+dfsg1-9+b9
debocker suggests no packages.
-- no debconf information
Index: debocker-0.2.6/debocker
===================================================================
--- debocker-0.2.6.orig/debocker
+++ debocker-0.2.6/debocker
@@ -473,10 +473,10 @@ def docker_build_bundle(bundle, no_cache
if build_arg:
docker_opts.extend(['--build-arg="{}"'.format(arg) for arg in
build_arg])
docker_opts = ' '.join(docker_opts)
- log_check_call('{} build {} - < {} | tee {}'.format(
+ log_check_call('{} build {} - < {} 2>&1 | tee {}'.format(
engine, docker_opts, bundle_esc, build_log_esc), shell = True)
with open(build_log) as f:
- match = r'Successfully built (\S+)'
+ match = r'writing image sha256:(\S+) done'
s = f.read().strip()
if engine == 'podman':
# Podman prints the container id on the last log line:
