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envelope-from=farosas@suse.de; helo=smtp-out2.suse.de X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Daniel P. Berrang=C3=A9 writes: > On Mon, Sep 14, 2026 at 08:58:09PM -0300, Fabiano Rosas wrote: >> Hi, I just wanted to share and ask for feedback on some container images >> I've been building as part of my testing of migration pull-requests. >>=20 >> From a Dockerfile from ./tests/docker/dockerfiles/ I'm producing the >> following: >>=20 >> $ docker images >> qemu-build-base:11.0.0 b6efa198e93a 5.8GB >> qemu-rootfs-base:11.0.0 72bcb5418f4d 4.08GB >> qemu:11.0.0 018a3f0f4dcc 2GB > > snip > >> 2) Neither the QEMU build nor the distro repos are reliable enough to >> allow me to just "go back in time" and rebuild at any moment, I need to >> keep the artifacts cached to avoid rebuilding. Otherwise it comes time >> to send a PR and I discover that some python piece has changed or the >> distro messed up the older repository. > > Yes, in general building old QEMU on new distros periodically > hits trouble. If building old QEMU, better reliability is > achieved by using a distro release that was from the same > timeframe as QEMU. Is using containers targetting such old > distro versions not an option ? The tests/docker/dockerfiles > from the old QEMU branch ought to work ? > Yes, I'm doing just that. Some tweaks are needed still. For instance, my script has something like this: dockerfile=3D"tests/docker/dockerfiles/opensuse-leap.docker" sed -i 's/ncurses-devel//' $dockerfile if [ "$tag" =3D "10.1.0" ]; then sed -i 's/libLLVM19//' $dockerfile fi > Our stable release branches have the same needs, and their > CI is using the container images from the old branches. > > How far back in time do you need/want to go for migration > testing ? Is it sufficient to merely target versions for > which mjt is still doing active maint work, so we can > expect the containers to still work. > I'm currently testing against the previous 3 releases. I think 2 releases is probably enough. > With regards, > Daniel