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charset="UTF-8" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: siemens.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: AM7PR10MB3320.EURPRD10.PROD.OUTLOOK.COM X-MS-Exchange-CrossTenant-Network-Message-Id: 4915cac4-d158-4f6f-2741-08dcf9cc7ef5 X-MS-Exchange-CrossTenant-originalarrivaltime: 31 Oct 2024 16:53:07.8371 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 38ae3bcd-9579-4fd4-adda-b42e1495d55a X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 3+61jWcMryzF1PUtGDHMnu1CPCjjis1P2wzEmCP2fEphdNNdy/qSCnaEU37945nvjzz2mB+NFggHyhsubmYXA1Eq2jixKA/a3fOzajdk9vI= X-MS-Exchange-Transport-CrossTenantHeadersStamped: PAVPR10MB7466 X-Original-Sender: alexander.heinisch@siemens.com X-Original-Authentication-Results: gmr-mx.google.com; dkim=pass header.i=@siemens.com header.s=selector2 header.b="P1G/UN0y"; arc=pass (i=1 spf=pass spfdomain=siemens.com dkim=pass dkdomain=siemens.com dmarc=pass fromdomain=siemens.com); spf=pass (google.com: domain of alexander.heinisch@siemens.com designates 2a01:111:f403:2613::62e as permitted sender) smtp.mailfrom=alexander.heinisch@siemens.com; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=siemens.com X-Original-From: "Heinisch, Alexander" Reply-To: "Heinisch, Alexander" Precedence: list Mailing-list: list isar-users@googlegroups.com; contact isar-users+owners@googlegroups.com List-ID: X-Spam-Checked-In-Group: isar-users@googlegroups.com X-Google-Group-Id: 914930254986 List-Post: , List-Help: , List-Archive: , List-Unsubscribe: , X-Spam-Status: No, score=-4.9 required=5.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,MAILING_LIST_MULTI, RCVD_IN_DNSWL_BLOCKED,RCVD_IN_MSPIKE_H2,RCVD_IN_RP_CERTIFIED, RCVD_IN_RP_RNBL,RCVD_IN_RP_SAFE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on shymkent.ilbers.de X-TUID: AXfo2kLYfVKV > On Thu, 2024-10-31 at 15:40 +0000, Heinisch, Alexander (FT RPD CED SES- > AT) wrote: > > > Hi, this series is much needed to work with the still unreliable > > > snapshot mirrors. > > > > > > @Alexander: Do you plan to send a v2? > > > > > > At the same time I'm working on adding internal apt-cacher-ng > > > support to kas to let the build pass the initial bootstrapping. > > > > > > Best regards, > > > Felix > > > > Hi Felix > > > > Thank you for coming back. > > > > Even when using apt-cacher-ng index files oftentimes got updated from > > snapshot.debian.org which caused problems when our company was on a > > blacklist for some time again. > > I know, but this is partially also due to bugs in the apt-cacher-ng imple= mentation. Today it completely broke after an upstream change on snapshot.d= .o requiring a backport of the fix in [1]. I just sent an email to the snap= shot ML requesting the backport. Yes, apt-cacher-ng by far is not the most stable software! > > [1] https://bugs-devel.debian.org/cgi-bin/bugreport.cgi?bug=3D1074404 > > > > > Unfortunately, I didn't find the time to analyze why that was the > > case. > > I did a tcpdump during one of our builds, but didn't analyze it for 2 > > weeks or so :-( > > > > But I suspect either apt client sends a reload request or the expiry > > date returned from upstream is to limited. > > It could also simply due to incorrect parsing of the expiry dates in apt-= cacher-ng. Recently there were a lot of fixes regarding time parsing. Trick= y to debug, though... > > > While this could be relevant when fetching packages from "main" > > mirrors, > > it should not have much impact on snapshot mirrors. > > > > To mitigate that issue, since then we switched to squid as a proxy for > > snapshot.debian.org Squid has an offline mode, which says, no matter > > what happens, cach entries once seen are never updated upstream. As > > stated above, while this could have drastic impacts when using main > > mirrors, it shouldn't cause issues on snapshots, by definition. > > > > Thus, I dropped apt-cacher-ng in our project in favour of squid. > > I also prepared documentation for such, but during preparing the > > patch, I was not sure if that is worth a separate doc/ file or if we > > should merge that with doc/offline.md. I was struggling with that > > decision since it does not really solve an offline case, as it only > > caches packages already seen once, and further, only solves the > > offline case for apt and not for other sources like git, ... > > Actually I'm more interested in having stable builds against snapshot.d.o= , not so much in 100% offline builds. The situation upstream also got a bit= better by rate-limiting on HTTP basis instead of TCP basis, so clients (in= cluding apt-cacher-ng and squid) should be able to correctly backoff. But I= also did not check if the rate- limiting is implemented correctly, so that= the client knows when to retry... Stable builds is prio 1 for us. But, also when using squid as a proxy ("non-offline mode") we experienced s= ome troubles with snapshot.d.o when downloading the index file [1] Even though we were already caching most of the data, snapshot.debian.org d= enied downloading that file, most probably because whole company network was blac= klisted. Thus, breaking our build, again. That was the reason why we decided to go with squid's "offline-mode". [1] http://snapshot.debian.org/archive/debian/20240904T000000Z/dists/bookwo= rm/InRelease > > Anyways, we have a dilemma here: We need a stable baseline to build again= st (both due to product requirements, as well as for the SState cache). But= currently it is REALLY hard to get this working in CI builds. > > > > > What is your opinion? > > Probably we need both, until it is not clear which solution is long- term= stable. > > Felix BR Alexander --=20 You received this message because you are subscribed to the Google Groups "= isar-users" group. To unsubscribe from this group and stop receiving emails from it, send an e= mail to isar-users+unsubscribe@googlegroups.com. To view this discussion visit https://groups.google.com/d/msgid/isar-users/= AM7PR10MB3320312B8ADF79BE6B0ED21786552%40AM7PR10MB3320.EURPRD10.PROD.OUTLOO= K.COM.