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[96.60.249.169]) by smtp.gmail.com with ESMTPSA id 00721157ae682-78821e76af5sm19985897b3.27.2025.11.14.15.16.43 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 14 Nov 2025 15:16:43 -0800 (PST) Message-ID: <2ade0084-7ce6-4be5-abc1-86e7a91f9dfa@gmail.com> Date: Fri, 14 Nov 2025 18:16:40 -0500 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 6/8] Support updates via systemd-sysupdate To: Alyssa Ross References: <20251112-updates-v2-0-88d96bf81b79@gmail.com> <20251112-updates-v2-6-88d96bf81b79@gmail.com> <87tsyxc26t.fsf@alyssa.is> <154426ab-f42b-4c5e-9f0e-8a91abbe7596@gmail.com> <877bvslskd.fsf@alyssa.is> Content-Language: en-US From: Demi Marie Obenour Autocrypt: addr=demiobenour@gmail.com; keydata= xsFNBFp+A0oBEADffj6anl9/BHhUSxGTICeVl2tob7hPDdhHNgPR4C8xlYt5q49yB+l2nipd aq+4Gk6FZfqC825TKl7eRpUjMriwle4r3R0ydSIGcy4M6eb0IcxmuPYfbWpr/si88QKgyGSV Z7GeNW1UnzTdhYHuFlk8dBSmB1fzhEYEk0RcJqg4AKoq6/3/UorR+FaSuVwT7rqzGrTlscnT DlPWgRzrQ3jssesI7sZLm82E3pJSgaUoCdCOlL7MMPCJwI8JpPlBedRpe9tfVyfu3euTPLPx wcV3L/cfWPGSL4PofBtB8NUU6QwYiQ9Hzx4xOyn67zW73/G0Q2vPPRst8LBDqlxLjbtx/WLR 6h3nBc3eyuZ+q62HS1pJ5EvUT1vjyJ1ySrqtUXWQ4XlZyoEFUfpJxJoN0A9HCxmHGVckzTRl 5FMWo8TCniHynNXsBtDQbabt7aNEOaAJdE7to0AH3T/Bvwzcp0ZJtBk0EM6YeMLtotUut7h2 Bkg1b//r6bTBswMBXVJ5H44Qf0+eKeUg7whSC9qpYOzzrm7+0r9F5u3qF8ZTx55TJc2g656C 9a1P1MYVysLvkLvS4H+crmxA/i08Tc1h+x9RRvqba4lSzZ6/Tmt60DPM5Sc4R0nSm9BBff0N m0bSNRS8InXdO1Aq3362QKX2NOwcL5YaStwODNyZUqF7izjK4QARAQABzTxEZW1pIE1hcmll IE9iZW5vdXIgKGxvdmVyIG9mIGNvZGluZykgPGRlbWlvYmVub3VyQGdtYWlsLmNvbT7CwXgE EwECACIFAlp+A0oCGwMGCwkIBwMCBhUIAgkKCwQWAgMBAh4BAheAAAoJELKItV//nCLBhr8Q AK/xrb4wyi71xII2hkFBpT59ObLN+32FQT7R3lbZRjVFjc6yMUjOb1H/hJVxx+yo5gsSj5LS 9AwggioUSrcUKldfA/PKKai2mzTlUDxTcF3vKx6iMXKA6AqwAw4B57ZEJoMM6egm57TV19kz PMc879NV2nc6+elaKl+/kbVeD3qvBuEwsTe2Do3HAAdrfUG/j9erwIk6gha/Hp9yZlCnPTX+ VK+xifQqt8RtMqS5R/S8z0msJMI/ajNU03kFjOpqrYziv6OZLJ5cuKb3bZU5aoaRQRDzkFIR 6aqtFLTohTo20QywXwRa39uFaOT/0YMpNyel0kdOszFOykTEGI2u+kja35g9TkH90kkBTG+a EWttIht0Hy6YFmwjcAxisSakBuHnHuMSOiyRQLu43ej2+mDWgItLZ48Mu0C3IG1seeQDjEYP tqvyZ6bGkf2Vj+L6wLoLLIhRZxQOedqArIk/Sb2SzQYuxN44IDRt+3ZcDqsPppoKcxSyd1Ny 2tpvjYJXlfKmOYLhTWs8nwlAlSHX/c/jz/ywwf7eSvGknToo1Y0VpRtoxMaKW1nvH0OeCSVJ itfRP7YbiRVc2aNqWPCSgtqHAuVraBRbAFLKh9d2rKFB3BmynTUpc1BQLJP8+D5oNyb8Ts4x Xd3iV/uD8JLGJfYZIR7oGWFLP4uZ3tkneDfYzsFNBFp+A0oBEAC9ynZI9LU+uJkMeEJeJyQ/ 8VFkCJQPQZEsIGzOTlPnwvVna0AS86n2Z+rK7R/usYs5iJCZ55/JISWd8xD57ue0eB47bcJv VqGlObI2DEG8TwaW0O0duRhDgzMEL4t1KdRAepIESBEA/iPpI4gfUbVEIEQuqdqQyO4GAe+M kD0Hy5JH/0qgFmbaSegNTdQg5iqYjRZ3ttiswalql1/iSyv1WYeC1OAs+2BLOAT2NEggSiVO txEfgewsQtCWi8H1SoirakIfo45Hz0tk/Ad9ZWh2PvOGt97Ka85o4TLJxgJJqGEnqcFUZnJJ riwoaRIS8N2C8/nEM53jb1sH0gYddMU3QxY7dYNLIUrRKQeNkF30dK7V6JRH7pleRlf+wQcN fRAIUrNlatj9TxwivQrKnC9aIFFHEy/0mAgtrQShcMRmMgVlRoOA5B8RTulRLCmkafvwuhs6 dCxN0GNAORIVVFxjx9Vn7OqYPgwiofZ6SbEl0hgPyWBQvE85klFLZLoj7p+joDY1XNQztmfA rnJ9x+YV4igjWImINAZSlmEcYtd+xy3Li/8oeYDAqrsnrOjb+WvGhCykJk4urBog2LNtcyCj kTs7F+WeXGUo0NDhbd3Z6AyFfqeF7uJ3D5hlpX2nI9no/ugPrrTVoVZAgrrnNz0iZG2DVx46 x913pVKHl5mlYQARAQABwsFfBBgBAgAJBQJafgNKAhsMAAoJELKItV//nCLBwNIP/AiIHE8b oIqReFQyaMzxq6lE4YZCZNj65B/nkDOvodSiwfwjjVVE2V3iEzxMHbgyTCGA67+Bo/d5aQGj gn0TPtsGzelyQHipaUzEyrsceUGWYoKXYyVWKEfyh0cDfnd9diAm3VeNqchtcMpoehETH8fr RHnJdBcjf112PzQSdKC6kqU0Q196c4Vp5HDOQfNiDnTf7gZSj0BraHOByy9LEDCLhQiCmr+2 E0rW4tBtDAn2HkT9uf32ZGqJCn1O+2uVfFhGu6vPE5qkqrbSE8TG+03H8ecU2q50zgHWPdHM OBvy3EhzfAh2VmOSTcRK+tSUe/u3wdLRDPwv/DTzGI36Kgky9MsDC5gpIwNbOJP2G/q1wT1o Gkw4IXfWv2ufWiXqJ+k7HEi2N1sree7Dy9KBCqb+ca1vFhYPDJfhP75I/VnzHVssZ/rYZ9+5 1yDoUABoNdJNSGUYl+Yh9Pw9pE3Kt4EFzUlFZWbE4xKL/NPno+z4J9aWemLLszcYz/u3XnbO vUSQHSrmfOzX3cV4yfmjM5lewgSstoxGyTx2M8enslgdXhPthZlDnTnOT+C+OTsh8+m5tos8 HQjaPM01MKBiAqdPgksm1wu2DrrwUi6ChRVTUBcj6+/9IJ81H2P2gJk3Ls3AVIxIffLoY34E +MYSfkEjBz0E8CLOcAw7JIwAaeBT In-Reply-To: <877bvslskd.fsf@alyssa.is> Content-Type: multipart/signed; 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boundary="------------ktQqV3kRV0PJ8ZueZpo5piXV"; protected-headers="v1" From: Demi Marie Obenour To: Alyssa Ross Cc: Spectrum OS Development Message-ID: <2ade0084-7ce6-4be5-abc1-86e7a91f9dfa@gmail.com> Subject: Re: [PATCH v2 6/8] Support updates via systemd-sysupdate References: <20251112-updates-v2-0-88d96bf81b79@gmail.com> <20251112-updates-v2-6-88d96bf81b79@gmail.com> <87tsyxc26t.fsf@alyssa.is> <154426ab-f42b-4c5e-9f0e-8a91abbe7596@gmail.com> <877bvslskd.fsf@alyssa.is> In-Reply-To: <877bvslskd.fsf@alyssa.is> Autocrypt-Gossip: addr=hi@alyssa.is; keydata= xsFNBFpSgoYBEAC4xkCYidG2JlRWulUkTWcx0pHFDf3oSbb6Q872Kb3iDChWgluNVz43hva1 3xfDo9foV0GoyfGl/ycSCkXX5hlQr7ir/5FN38E7H/yY6tH8+l68iDgIOcb1qY0OYaxyg+Lz WesfFQedrmwNTbF4L1BtWzrTR5PflDdhDo5VWSguHGJFSclchcr/6UmMb/gOUN+2ElBC2TE2 EKY099phZ6DJZ2aZCsclwKIdCpZzXlEmXPAeaH5om6xo90JYv5+sFji40R0Plqec3WC+jTxy lGca6IbPdOminuUF+GvsR86eVsgh/0XNK7/zus7gyc4PuMUA1rCoeHcWOBDPgmelgCQyJGXd /bXeKuUsGoge58uc7/YNvOh1vfpD3AaEMqAyXfmmUwBnIicml74+2eOpH3Oljfs01g+DhkOB MtpVSZSgaIDvP0WG6cbAxImoUasnmNxEDNskfVmI8bsajPW9bt4z5hiP5Q9G3vE0D5HcIFdM adOz81PpOwNiUXcjtYV1PWZQ56jbSTOf8EBvsB71WwB+XgVWcPzIlY8hAykiHIO87oV3o71U JTAn1Foj7mjSADnY0deleOmar/K5jrK3wvKKM1XlB7PXcGBdkorJC+cbxVsw0ADzMw0c7bVc wEE7OFvHjQiIK1lO+lb1cvGBBY3IZxjsjZdA/VsFHFdAeYlzNQARAQABzRpBbHlzc2EgUm9z cyA8aGlAYWx5c3NhLmlzPsLBlwQTAQgAQQIbAwULCQgHAgYVCAkKCwIEFgIDAQIeAQIXgAIZ ARYhBHVzVtd5u7iIdz5BXnNszfnvUb2XBQJpALHXBQkPJNZRAAoJEHNszfnvUb2X2jEP/AqQ aafKiC7ormevgoCH4QinAKJoXAqiwOIdRK55HOvyhGWjnlzqoK4JTUFVRMR4Vat/APlkjOUk LPXKk+DCn4loFyl7BCLvsk4Xwy7WmXyfSPqjdik8/cjTv/Q4AHTYTpnx7GMC5eTS7ULmUvcf mD/JRr7NM2273Z7dkL3gOeZdnXYOQaGAIIox91qCtmnQhn+V7s3uxvcRl8I2/Qnn3S2veV03 LXSugAXSTdKRa7LBrcSm9TtC/D3qY9kStHiaiB/eAJsOQ0l5yRfax5INorE2DQgBKjbiBcnQ mTX7Rl9LW+U0ibHmKOFG8Zs+zKlmItek49cmqoGOv66RAY6dGUOHoEQgP0EUDJ8xGwActToC lOGZrzcXfrfx0CYlgqYE1VEWgSmtbTW1DBXiZIPKUMLJGhgaIHSKEjYujHd+vGytAMGKQsVQ OwgOMHYWyzAIB/Y6hZGNK8y5fxr468zX876mDdXhYo4dKA7UEOeQOlAIGobTXDRFEC7B/UAj qYbP+qmnyUohCy/Pf04cF0ucpWW2Z00sBL83lauhyQHiLze5OznvOeEkEeXQ6DsJOY0dmrsi 0NJZ1QoyYewXOPmPBNc7IesY1MjrpAnHgeAt1rgEPwTkt4NrRASsPe5JowJcc7CpIdR8eOrG hrw+bEMyoyjk7fN6Hs6MK+hVihMNhUwMzjgEZyd/yxIKKwYBBAGXVQEFAQEHQCVxoiHOlsEo NDKGCbxg4nL3E1CV0MRQCU1hPowd77h3AwEIB8LBfAQYAQoAJgIbDBYhBHVzVtd5u7iIdz5B XnNszfnvUb2XBQJpALHQBQkCT9j5AAoJEHNszfnvUb2XhSMP/0gStw42LjpjVLh+0HKWafs3 T9NJxtefYRbyu4wkkO0dss2pkl9gekZnvgktD0SzIe8AiMszs1rUWMG8zPXVWdMi7tSNm/IR WPa0XZDIoDwJY4T342nCvHeDsfoJnGg8o0nreI2djwO8sc9aeSevm60MQ9AouFBpS6Qw7f/Z LalXH4aWCCtvAO1o95lQXEoH4Lg4qnS6GxYMYi1u3IzrYdUu0By/Ccc5+AOOICgbJnpOoYQI bVDbdjMkj18JxxmpN5amOkPdiDndpzWkWm+oNhGUITYp6EuP1esRb35MgOmFGouvt5UdKpEl Egs2y5h9oR+kiiu9DhrC0UFL2CQ/HdiukCAxADKX3RE9m+mprSbvw7CsYmXUTH6WzPpvxpGx wQq7m2O7uy85u0HyVYkiWQiAfwCbEr1vrFU7gscBW+FcrLIODauovA9eZgA4d+cHRXfzsdKW u/QuVHsABh78LLIq008GcqJChSe4KHrJ5PUjkLnyp/Sshrmuyoy+DwqYky0KK4NtkaWa2o0B TFp+Kk2VCxWA8i/azPvTMzXOWNwqogISp5SwljiEx0hkyf0HvSb3gHfuGbZ+eGfWB+qy2pTD x/YriV5EfqkP+4+1cqXjasrQxyZUW0ULRke0j92Cgt+J722PIcOAb8vdSGF4AXczO+KMtNn9 wGxvGU7TX5ou --------------ktQqV3kRV0PJ8ZueZpo5piXV Content-Type: multipart/mixed; boundary="------------oSELBMN07u0mVOsLX1C2KRrb" --------------oSELBMN07u0mVOsLX1C2KRrb Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 11/14/25 07:14, Alyssa Ross wrote: > Demi Marie Obenour writes: >=20 >> On 11/13/25 11:44, Alyssa Ross wrote: >>> Demi Marie Obenour writes: >>> >>>> +# 9. Call systemd-sysupdate to run the actual update. >>>> + >>>> +if { mkdir -p -m 0700 /run/updater } >>>> +s6-setlock /run/update-lock >>>> +foreground { redirfd -w 2 /dev/null rmdir -- $1 } >>>> +if { umask 0077 mkdir -p -- $1 } >>>> +cd $1 >>>> +foreground { >>>> + # If this exists already that is okay. >>>> + foreground { redirfd -w 2 /dev/null btrfs subvolume create -- sha= red } >>>> + >>> >>> Wouldn't it break if there's already stuff in it? >> >> No, it works fine in this case. I checked :). >> >>> I'd do >>> >>> foreground { redirfd -w 2 /dev/null btrfs subvolume delete -- shared= } >>> if { btrfs subvolume create -- shared } >>> >>> and then you know you've got an empty subvolume. >> >> An empty subvolume isn't good: it means that systemd-sysupdate will >> redownload an update even when it isn't needed. >=20 > When would the update have already been downloaded but not applied? > Only if there's an error in actually installing it? I'd feel happier > knowing we were always starting with a clean state. The existence of the downloaded files is how the update VM knows "we already have the latest version installed, don't try to download anything new". The VM doesn't know the actual version installed on the host, so it can't query this by other means. >>>> + # Snapshot directory may have files or directories with untrusted= names. >>>> + # Redirect its output to /dev/null to avoid printing them to the = console. >>>> + ifelse -n { redirfd -w 2 /dev/null rm -rf -- snapshot } { >>>> + foreground { redirfd -w 2 echo "Cannot remove snapshot director= y" } >>>> + exit 1 >>>> + } >>> >>> Why not btrfs subvolume delete? It's faster and won't print names. >> >> It doesn't distinguish "subvolume doesn't exist" from "problem >> deleting subvolume". A better solution is to call `rm -f` if `btrfs >> subvolume delete` failed. That ignores "does not exist" errors, >> but not other errors. >=20 > Right. I had assumed btrfs subvolume create would cause an error if it= > already existed, but you've said it doesn't. I don't want to create the subvolume over and over, because of the re >>>> + >>>> + backtick -E update_vm_id_ { >>>> + backtick -E id_path { readlink /run/vm/by-name/sys.appvm-update= s } >>>> + basename -- $id_path >>>> + } >>>> + >>>> + multisubstitute { >>>> + define fsdir /run/vm/by-id/${update_vm_id_}/fs >>>> + define update_vm_id ${update_vm_id_} >>> >>> Why? >> >> Avoiding serial substitution. >=20 > But this is serial substitution. You're substituting update_vm_id_, an= d > then you're doing another substitution of update_vm_id without the > underscore. Why? Why not the following? >=20 > backtick update_vm_id { ... } > multisubstitute { > define fsdir ... > importas -Siu update_vm_id > } "serial substitution" means that one substitutes into a string that has already been substituted into. See the multisubstitute documentation for why this is bad. I avoided the route you describe because I wanted to define fsdir and update_vm_id in the same call to multisubstitute. >>>> + } >>>> + >>>> + # $fsdir is read-only to the guest, but read-write to the host. >>>> + # Directories bind-mounted into it are read-write to the guest. >>>> + # See etc/s6-linux-init/run-image/service/vhost-user-fs/template/= run >>>> + # for details. >>>> + >>>> + # Set up /etc with what the VM needs. The VM will overlay this >>>> + # on its own /etc. >>>> + if { rm -rf -- ${fsdir}/etc } >>>> + if { umask 022 mkdir -p -- ${fsdir}/updates ${fsdir}/etc/systemd = } >>>> + if { cp -R -- /etc/updatevm/sysupdate.d /etc/updatevm/url-env ${f= sdir}/etc } >>>> + if { cp -- /etc/systemd/import-pubring.gpg ${fsdir}/etc/systemd }= >>> >>> Why copy rather than bind mount? >> >> Target does not exist and I didn't want to bind-mount all of /etc/syst= emd. >=20 > You can touch a file and then bind mount, and still save a copy. This is a tiny file. I suspect the extra exec is more expensive than the copy. >>>> + >>>> + # If the directory is already mounted, unmount it. This prevents= a >>>> + # confusing error from mount. >>>> + foreground { redirfd -w 2 /dev/null umount -- ${fsdir}/updates } >>>> + >>>> + # Share the update directory with the VM. >>>> + if { mount --bind -- shared ${fsdir}/updates } >>>> + >>>> + # Start the update VM. >>>> + if { vm-start $update_vm_id } >>>> + >>>> + # Wait for the VM to exit. >>>> + if { s6-svwait -D ${svcdir} } >>>> + >>> >>> It might be more robust to use a transient VM, like we use for >>> AppImages, so that nothing can restart it. Transient VMs are still >>> developing though, so it's also fine to say we'll do it this way for = now >>> and adapt it later. This would also save all the filesystem resettin= g >>> you're needing to do here. >> >> The path to the update directory is user-provided. It's not from >> the VM's persistent storage. >=20 > Ideally (at some point) it isn't user provided, and is the VM's > transient disk-backed storage, IMO. I'd prefer that too, but right now this would cause repeated calls to the updater to download the current version over and over. That definitely isn't good. I'd prefer to get a basic updater working first and then improve it over time. >>>> @@ -17,5 +18,11 @@ let >>>> callConfig =3D config: if builtins.typeOf config =3D=3D "lambda" = then config { >>>> inherit default; >>>> } else config; >>>> + finalConfig =3D default // callConfig config; >>>> in >>>> - default // callConfig config; >>>> + finalConfig // { >>>> + update-signing-key =3D builtins.path { >>>> + name =3D "signing-key"; >>>> + path =3D finalConfig.update-signing-key; >>>> + }; >>>> + } >>> >>> What does this do? >> >> This ensures that the Nix store path doesn't depend on the name of >> the update signing key, only its contents. >=20 > Interesting. Does that matter, though? It ends up being called > /etc/systemd/import-pubring.gpg in the image regardless. Otherwise renaming it would cause a pointless rebuild of a bunchof stuff.= >>>> diff --git a/vm/app/updates.nix b/vm/app/updates.nix >>>> new file mode 100644 >>>> index 0000000000000000000000000000000000000000..d2c1e5fcb35b37c7ed8a= 173f19b97894a36a7f0c >>>> --- /dev/null >>>> +++ b/vm/app/updates.nix >>>> @@ -0,0 +1,37 @@ >>>> +# SPDX-License-Identifier: MIT >>>> +# SPDX-FileCopyrightText: 2023 Alyssa Ross >>>> +# SPDX-FileCopyrightText: 2025 Demi Marie Obenour >>>> + >>>> +import ../../lib/call-package.nix ( >>>> +{ callSpectrumPackage, config, curl, lib, src >>>> +, runCommand, systemd, writeScript >>>> +}: >>>> + >>>> +let >>>> + update-url =3D config.update-url; >>>> + mountpoint =3D "/run/virtiofs/virtiofs0"; >>>> + sysupdate-path =3D "${systemd}/lib/systemd/systemd-sysupdate"; >>>> + runner =3D writeScript "update-run-script" >>>> + '' >>>> + #!/usr/bin/execlineb -P >>>> + if { mount -toverlay -olowerdir=3D${mountpoint}/etc:/etc -- ove= rlay /etc } >>>> + envfile ${mountpoint}/etc/url-env >>> >>> Seems like overkill to use an envfile for a single URL? >> >> It is indeed overkill, but I'm not aware of a simpler option. >> There is backtick + cat but that's two programs rather than one. >=20 > I think the canonical way would be redirfd + withstdinas, but that's > also two programs, so if you want to avoid that, perhaps s6-envdir? > Reading it isn't any simpler but writing it at least doesn't require a > special tool. We need sed to generate the .transfer files anyway. >>>> + importas -i update_url UPDATE_URL >>>> + if { ${sysupdate-path} update } >>>> + if { ${curl}/bin/curl -L --proto =3Dhttp,https >>>> + -o ${mountpoint}/updates/SHA256SUMS.gpg ''${update_url}/SHA2= 56SUMS.gpg } >>>> + # systemd-sysupdate recently went from needing SHA256SUMS.gpg t= o SHA256SUMS.sha256.asc. >>>> + # I (Demi) have no need if this is intentional or a bug. I als= o have no idea if this >>>> + # behavior will stay unchanged in the future. Therefore, creat= e both files and let >>>> + # systemd-sysupdate ignore the one it isn't interested in. >>>> + if { ln -f ${mountpoint}/updates/SHA256SUMS.gpg ${mountpoint}/u= pdates/SHA256SUMS.sha256.asc } >>> >>> Would be good to figure out why that happened. If we add a comment l= ike >>> this it's very unlikely to ever get cleaned up. >> >> https://github.com/systemd/systemd/issues/39273 >=20 > "hwdb: drop trailing whitespace"? https://github.com/systemd/systemd/issues/39723 ("systemd-sysupdate checks for SHA256SUMS.sha256.asc when fetching from f= ile:///"), which was fixed in ("pull: fix SHA256SUMS fallback for file:// URLs"). systemd v258.1 should have the fix. Does Spectrum use an older nixpkgs? >>>> + ${curl}/bin/curl -L --proto =3Dhttp,https >>>> + -o ${mountpoint}/updates/SHA256SUMS ''${update_url}/SHA256SU= MS >>>> + ''; >>>> +in >>>> + >>>> +callSpectrumPackage ../make-vm.nix {} { >>>> + providers.net =3D [ "sys.netvm" ]; >>>> + type =3D "nix"; >>>> + run =3D "${runner}"; >>> >>> Might as well inline this. >> >> I chose to keep it separate to improve readability. >=20 > Okay. 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