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Tue, 3 Sep 2024 19:49:03 +0000 Message-ID: <0176a32d-9d97-40f1-91cf-7e6a292cb6a3@siemens.com> Date: Tue, 3 Sep 2024 21:49:01 +0200 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3] expand-on-first-boot: Ensure that /tmp is writable To: Florian Bezdeka , "MOESSBAUER, Felix" , "ubely@ilbers.de" , "Kowalsky, Clara" Cc: "isar-users@googlegroups.com" References: <20240725141729.1344298-1-clara.kowalsky@siemens.com> <14ba448c2f93d3aa98cf6326541d62c524c21831.camel@siemens.com> <28a07330fe14dadcf82f32290671ea922ab7150e.camel@ilbers.de> <5d23fe9e9adda350f5596f00d7b8bd1eb3c67ed6.camel@ilbers.de> <7009e44f4fb7730435f5f0d726f11448a94407d2.camel@siemens.com> <9a103f6ae148f7183bea97c3493ee86e30da6b71.camel@siemens.com> From: "'Jan Kiszka' via isar-users" Content-Language: en-US Autocrypt: addr=jan.kiszka@siemens.com; keydata= xsFNBGZY+hkBEACkdtFD81AUVtTVX+UEiUFs7ZQPQsdFpzVmr6R3D059f+lzr4Mlg6KKAcNZ uNUqthIkgLGWzKugodvkcCK8Wbyw+1vxcl4Lw56WezLsOTfu7oi7Z0vp1XkrLcM0tofTbClW xMA964mgUlBT2m/J/ybZd945D0wU57k/smGzDAxkpJgHBrYE/iJWcu46jkGZaLjK4xcMoBWB I6hW9Njxx3Ek0fpLO3876bszc8KjcHOulKreK+ezyJ01Hvbx85s68XWN6N2ulLGtk7E/sXlb 79hylHy5QuU9mZdsRjjRGJb0H9Buzfuz0XrcwOTMJq7e7fbN0QakjivAXsmXim+s5dlKlZjr L3ILWte4ah7cGgqc06nFb5jOhnGnZwnKJlpuod3pc/BFaFGtVHvyoRgxJ9tmDZnjzMfu8YrA +MVv6muwbHnEAeh/f8e9O+oeouqTBzgcaWTq81IyS56/UD6U5GHet9Pz1MB15nnzVcyZXIoC roIhgCUkcl+5m2Z9G56bkiUcFq0IcACzjcRPWvwA09ZbRHXAK/ao/+vPAIMnU6OTx3ejsbHn oh6VpHD3tucIt+xA4/l3LlkZMt5FZjFdkZUuAVU6kBAwElNBCYcrrLYZBRkSGPGDGYZmXAW/ VkNUVTJkRg6MGIeqZmpeoaV2xaIGHBSTDX8+b0c0hT/Bgzjv8QARAQABzSNKYW4gS2lzemth IDxqYW4ua2lzemthQHNpZW1lbnMuY29tPsLBlAQTAQoAPhYhBABMZH11cs99cr20+2mdhQqf QXvYBQJmWPvXAhsDBQkFo5qABQsJCAcCBhUKCQgLAgQWAgMBAh4BAheAAAoJEGmdhQqfQXvY zPAP/jGiVJ2VgPcRWt2P8FbByfrJJAPCsos+SZpncRi7tl9yTEpS+t57h7myEKPdB3L+kxzg K3dt1UhYp4FeIHA3jpJYaFvD7kNZJZ1cU55QXrJI3xu/xfB6VhCs+VAUlt7XhOsOmTQqCpH7 pRcZ5juxZCOxXG2fTQTQo0gfF5+PQwQYUp0NdTbVox5PTx5RK3KfPqmAJsBKdwEaIkuY9FbM 9lGg8XBNzD2R/13cCd4hRrZDtyegrtocpBAruVqOZhsMb/h7Wd0TGoJ/zJr3w3WnDM08c+RA 5LHMbiA29MXq1KxlnsYDfWB8ts3HIJ3ROBvagA20mbOm26ddeFjLdGcBTrzbHbzCReEtN++s gZneKsYiueFDTxXjUOJgp8JDdVPM+++axSMo2js8TwVefTfCYt0oWMEqlQqSqgQwIuzpRO6I ik7HAFq8fssy2cY8Imofbj77uKz0BNZC/1nGG1OI9cU2jHrqsn1i95KaS6fPu4EN6XP/Gi/O 0DxND+HEyzVqhUJkvXUhTsOzgzWAvW9BlkKRiVizKM6PLsVm/XmeapGs4ir/U8OzKI+SM3R8 VMW8eovWgXNUQ9F2vS1dHO8eRn2UqDKBZSo+qCRWLRtsqNzmU4N0zuGqZSaDCvkMwF6kIRkD ZkDjjYQtoftPGchLBTUzeUa2gfOr1T4xSQUHhPL8zsFNBGZY+hkBEADb5quW4M0eaWPIjqY6 aC/vHCmpELmS/HMa5zlA0dWlxCPEjkchN8W4PB+NMOXFEJuKLLFs6+s5/KlNok/kGKg4fITf Vcd+BQd/YRks3qFifckU+kxoXpTc2bksTtLuiPkcyFmjBph/BGms35mvOA0OaEO6fQbauiHa QnYrgUQM+YD4uFoQOLnWTPmBjccoPuiJDafzLxwj4r+JH4fA/4zzDa5OFbfVq3ieYGqiBrtj tBFv5epVvGK1zoQ+Rc+h5+dCWPwC2i3cXTUVf0woepF8mUXFcNhY+Eh8vvh1lxfD35z2CJeY txMcA44Lp06kArpWDjGJddd+OTmUkFWeYtAdaCpj/GItuJcQZkaaTeiHqPPrbvXM361rtvaw XFUzUlvoW1Sb7/SeE/BtWoxkeZOgsqouXPTjlFLapvLu5g9MPNimjkYqukASq/+e8MMKP+EE v3BAFVFGvNE3UlNRh+ppBqBUZiqkzg4q2hfeTjnivgChzXlvfTx9M6BJmuDnYAho4BA6vRh4 Dr7LYTLIwGjguIuuQcP2ENN+l32nidy154zCEp5/Rv4K8SYdVegrQ7rWiULgDz9VQWo2zAjo TgFKg3AE3ujDy4V2VndtkMRYpwwuilCDQ+Bpb5ixfbFyZ4oVGs6F3jhtWN5Uu43FhHSCqUv8 FCzl44AyGulVYU7hTQARAQABwsF8BBgBCgAmFiEEAExkfXVyz31yvbT7aZ2FCp9Be9gFAmZY +hkCGwwFCQWjmoAACgkQaZ2FCp9Be9hN3g/8CdNqlOfBZGCFNZ8Kf4tpRpeN3TGmekGRpohU bBMvHYiWW8SvmCgEuBokS+Lx3pyPJQCYZDXLCq47gsLdnhVcQ2ZKNCrr9yhrj6kHxe1Sqv1S MhxD8dBqW6CFe/mbiK9wEMDIqys7L0Xy/lgCFxZswlBW3eU2Zacdo0fDzLiJm9I0C9iPZzkJ gITjoqsiIi/5c3eCY2s2OENL9VPXiH1GPQfHZ23ouiMf+ojVZ7kycLjz+nFr5A14w/B7uHjz uL6tnA+AtGCredDne66LSK3HD0vC7569sZ/j8kGKjlUtC+zm0j03iPI6gi8YeCn9b4F8sLpB lBdlqo9BB+uqoM6F8zMfIfDsqjB0r/q7WeJaI8NKfFwNOGPuo93N+WUyBi2yYCXMOgBUifm0 T6Hbf3SHQpbA56wcKPWJqAC2iFaxNDowcJij9LtEqOlToCMtDBekDwchRvqrWN1mDXLg+av8 qH4kDzsqKX8zzTzfAWFxrkXA/kFpR3JsMzNmvextkN2kOLCCHkym0zz5Y3vxaYtbXG2wTrqJ 8WpkWIE8STUhQa9AkezgucXN7r6uSrzW8IQXxBInZwFIyBgM0f/fzyNqzThFT15QMrYUqhhW ZffO4PeNJOUYfXdH13A6rbU0y6xE7Okuoa01EqNi9yqyLA8gPgg/DhOpGtK8KokCsdYsTbk= In-Reply-To: <9a103f6ae148f7183bea97c3493ee86e30da6b71.camel@siemens.com> Content-Type: text/plain; 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dkim=pass header.i=@siemens.com header.s=selector2 header.b=aWX6Px5n; 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 jan.kiszka@siemens.com designates 2a01:111:f403:2606::61f as permitted sender) smtp.mailfrom=jan.kiszka@siemens.com; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=siemens.com X-Original-From: Jan Kiszka Reply-To: Jan Kiszka 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_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: Tjj1dUP9wIWG On 03.09.24 20:05, Florian Bezdeka wrote: > On Tue, 2024-09-03 at 11:05 +0200, Jan Kiszka wrote: >> On 03.09.24 09:20, 'MOESSBAUER, Felix' via isar-users wrote: >>> On Thu, 2024-08-15 at 07:07 +0300, Uladzimir Bely wrote: >>>> On Tue, 2024-08-13 at 13:32 +0300, Uladzimir Bely wrote: >>>>> On Tue, 2024-08-13 at 09:24 +0000, MOESSBAUER, Felix wrote: >>>>>> On Tue, 2024-08-13 at 12:17 +0300, Uladzimir Bely wrote: >>>>>>> On Thu, 2024-07-25 at 16:17 +0200, 'Clara Kowalsky' via isar- >>>>>>> users >>>>>>> wrote: >>>>>>>> By setting PrivateTmp, a new file system namespace is created >>>>>>>> for >>>>>>>> this >>>>>>>> service and private /tmp//tmp and >>>>>>>> /var/tmp//tmp >>>>>>>> subdirectories are mounted, which are only used for processes >>>>>>>> of >>>>>>>> this >>>>>>>> namespace. The service unit receives a mount unit dependency >>>>>>>> for >>>>>>>> all >>>>>>>> mounts required to access /tmp and /var/tmp. >>>>>>>> This ensures that the /tmp directory is writable for the >>>>>>>> service, >>>>>>>> as >>>>>>>> mktemp is used in expand-last-partition.sh and creates a >>>>>>>> temporary >>>>>>>> file. >>>>>>>> >>>>>>>> Signed-off-by: Clara Kowalsky >>>>>>>> --- >>>>>>>> =C2=A0.../expand-on-first-boot/files/expand-on-first- >>>>>>>> boot.service=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 >>>>>>>>> >>>>>>>> 1 >>>>>>>> + >>>>>>>> =C2=A01 file changed, 1 insertion(+) >>>>>>>> >>>>>>>> diff --git a/meta/recipes-support/expand-on-first- >>>>>>>> boot/files/expand- >>>>>>>> on-first-boot.service b/meta/recipes-support/expand-on-first- >>>>>>>> boot/files/expand-on-first-boot.service >>>>>>>> index 90c92a39..8e76998b 100644 >>>>>>>> --- a/meta/recipes-support/expand-on-first-boot/files/expand- >>>>>>>> on- >>>>>>>> first-boot.service >>>>>>>> +++ b/meta/recipes-support/expand-on-first-boot/files/expand- >>>>>>>> on- >>>>>>>> first-boot.service >>>>>>>> @@ -16,6 +16,7 @@ Type=3Doneshot >>>>>>>> =C2=A0ExecStart=3D/usr/share/expand-on-first-boot/expand-last- >>>>>>>> partition.sh >>>>>>>> =C2=A0ExecStartPost=3D-/bin/systemctl disable expand-on-first- >>>>>>>> boot.service >>>>>>>> =C2=A0ExecStopPost=3D-/bin/systemctl disable expand-on-first- >>>>>>>> boot.service >>>>>>>> +PrivateTmp=3Dtrue >>>>>>>> =C2=A0 >>>>>>>> =C2=A0[Install] >>>>>>>> =C2=A0WantedBy=3Dsysinit.target >>>>>>>> --=20 >>>>>>>> 2.45.2 >>>>>>>> >>>>>>> >>>>>>> Hello all. >>>>>>> >>>>>>> After few days having this patch merged we at least twice faced >>>>>>> the >>>>>>> issue in CI with running qemuamd64 machine, probably related to >>>>>>> the >>>>>>> applied patch. >>>>>>> >>>>>>> Error message is "ERROR| No resize output while expected". >>>>>>> E.g., >>>>>>> there >>>>>>> is no btrfs resize output in VM boot log. >>>>>>> >>>>>>> The reason of non-running expand-on-first-boot serivce is: >>>>>>> >>>>>>> ``` >>>>>>> [=C2=A0=C2=A0=C2=A0 5.578636] systemd[1]: local-fs-pre.target: Job = expand-on- >>>>>>> first- >>>>>>> boot.service/start deleted to break ordering cycle starting >>>>>>> with >>>>>>> local- >>>>>>> fs-pre.target/start >>>>>>> ``` >>>>>> >>>>>> Interesting, I observed this same issue as well, but thought it >>>>>> comes >>>>>> from a downstream part. You're right, this cannot work: >>>>>> >>>>>> Citing systemd.exec: >>>>>> >>>>>> Similarly, units with PrivateTmp=3D enabled automatically get mount >>>>>> unit >>>>>> dependencies for all mounts required to access /tmp/ and >>>>>> /var/tmp/. >>>>>> They will also gain an automatic After=3D dependency on systemd- >>>>>> tmpfiles- >>>>>> setup.service(8).=20 >>>>>> >>>>>> If /var is the partition to be resized, this will break. >>>>>> >>>>>> Felix >>>>>> >>>>> >>>>> The dependency conflict seems to be here: >>>>> >>>>> - expand-on-first-boot.service >>>>> Before=3Dlocal-fs-pre.target >>>>> PrivateTmp=3Dtrue # This means implicit "After=3Dsystemd-tmpfiles- >>>>> setup.service" dependency0, according to=20 >>>>> https://www.freedesktop.org/software/systemd/man/latest/systemd.exec.= html >>>>> >>>>> - systemd-tmpfiles-setup.service=20 >>>>> After=3Dlocal-fs.target >>>>> >>>>> - local-fs.target >>>>> After=3Dlocal-fs-pre.target >>>>> >>>>> >>>> >>>> Finally, does this all mean we need to revert this v3 patch and get >>>> back to "[PATCH v2] expand-on-first-boot: Add /tmp to >>>> ConditionPathIsReadWrite" variant? >>> >>> The conditions are evaluated right before the service starts. By that, >>> we might have non-deterministic behavior, depending on which service >>> mounts /tmp (if at all) and when it is started relative to the expand- >>> on-first-boot. >>> >>> I'm wondering if we should better create our own tmpfs in combination >>> with TMPDIR, just for that service (and drop it after execution). For >>> obvious reasons, the expanding needs to happen VERY early, but at that >>> point in time not much can be assumed about the rootfs. >>> >>> CC'ing Florian. >> >> In many cases, expansion can ran also after the system is fully booted >> and operational - unless it is then already complaining about too little >> disk space ;) >=20 > Not sure if I can help here. expand-on-first-boot tends to explode > every time we touch it. It seems that we don't have tests for most of > the use cases (like encrypted disks, ...) which makes it hard to prove > the correctness. >=20 > Couple of things I noticed while scanning / looking at the code: >=20 > - Why do we require /etc to be writable? We only read /etc/fstab > right? >=20 Was like that since day #1, and the original author forgot the reason. > - I think all relevant file systems support growing the file system > while being active / online / mounted. Maybe we don't have to run=C2=A0 > so early? Might help to reduce rootfs requirements. >=20 Just found 7dff89e9a10b3b5d9fc07f73a74258e51a3fe2dd and "Before=3Dlocal-fs-pre.target" - seems we do need to be early in some cases= . > - Do we still need expand-on-first-boot as it is right now? Seems > systemd provides x-systemd.growfs flags in /etc/fstab. Which=C2=A0use > cases are not supported by that systemd feature? Could we migrate? >=20 Henning and Tobias tried that and had to give up, see 35f9487a849a10e40d4fbb3d9b6f13a25d4a1f96. > - According to the patch description we need /tmp (or any tmpfs)=20 > so that mktemp is working.=C2=A0 >=20 > We use the generated tmp directory as mount point only. We never=C2=A0 > add / write any files to it. Can't we just create any "random"=C2=A0 > (in terms of hardcoded...) directory for that to get rid of the > systemd dependency? /.expand-on-first-boot-mountpoint? Jan --=20 Siemens AG, Technology Linux Expert Center --=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 on the web visit https://groups.google.com/d/msgid/= isar-users/0176a32d-9d97-40f1-91cf-7e6a292cb6a3%40siemens.com.