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[96.60.249.169]) by smtp.gmail.com with ESMTPSA id 956f58d0204a3-6433c073e07sm1875903d50.6.2025.11.28.13.28.24 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 28 Nov 2025 13:28:24 -0800 (PST) Message-ID: Date: Fri, 28 Nov 2025 16:28:20 -0500 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 11/13] Support updates via systemd-sysupdate To: Alyssa Ross References: <20251126-updates-v5-0-fd746748febd@gmail.com> <20251126-updates-v5-11-fd746748febd@gmail.com> <87zf86nuay.fsf@alyssa.is> <87v7itopob.fsf@alyssa.is> <87pl91oof1.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: <87pl91oof1.fsf@alyssa.is> Content-Type: multipart/signed; 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boundary="------------hKRSrEo6NdwX9dKoBvk7k1K2"; protected-headers="v1" From: Demi Marie Obenour To: Alyssa Ross Cc: Spectrum OS Development Message-ID: Subject: Re: [PATCH v5 11/13] Support updates via systemd-sysupdate References: <20251126-updates-v5-0-fd746748febd@gmail.com> <20251126-updates-v5-11-fd746748febd@gmail.com> <87zf86nuay.fsf@alyssa.is> <87v7itopob.fsf@alyssa.is> <87pl91oof1.fsf@alyssa.is> In-Reply-To: <87pl91oof1.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 --------------hKRSrEo6NdwX9dKoBvk7k1K2 Content-Type: multipart/mixed; boundary="------------Zj5utszvIS8L8iFJO0fF9eX8" --------------Zj5utszvIS8L8iFJO0fF9eX8 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 11/28/25 16:08, Alyssa Ross wrote: > Demi Marie Obenour writes: >=20 >> On 11/28/25 15:41, Alyssa Ross wrote: >>> Demi Marie Obenour writes: >>> >>>> On 11/28/25 08:47, Alyssa Ross wrote: >>>>> Demi Marie Obenour writes: >>>>> >>>>>> diff --git a/host/rootfs/image/usr/bin/spectrum-update b/host/root= fs/image/usr/bin/spectrum-update >>>>>> new file mode 100755 >>>>>> index 0000000000000000000000000000000000000000..613b43570d0538fce2= 0296ccb1de2a6364e0df55 >>>>>> --- /dev/null >>>>>> +++ b/host/rootfs/image/usr/bin/spectrum-update >>>>>> @@ -0,0 +1,92 @@ >>>>>> +#!/bin/execlineb -WS1 >>>>>> +# SPDX-License-Identifier: EUPL-1.2+ >>>>>> +# SPDX-FileCopyrightText: 2025 Demi Marie Obenour >>>>>> + >>>>>> +if { mkdir -p -m 0700 /run/updater } >>>>>> + >>>>>> +# Take a global lock to avoid races. >>>>>> +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 -- s= hared } >>>>>> + >>>>>> + # Delete any stale temporary files. Delete any existing signat= ure >>>>>> + # files. If the VM is still running (it should not be), the VM= might >>>>>> + # have write access to the directory. However, updates-dir-che= ck is >>>>>> + # safe against that. >>>>>> + if { updates-dir-check cleanup shared } >>>>>> + >>>>>> + if { >>>>>> + foreground { >>>>>> + # TODO: suppress only "subvolume does not exist" errors. >>>>>> + redirfd -w 2 /dev/null >>>>>> + btrfs subvolume delete snapshot >>>>>> + } >>>>>> + rm -f snapshot >>>>>> + } >>>>>> + >>>>>> + backtick -E update_vm_id { >>>>>> + backtick -E id_path { readlink /run/vm/by-name/sys.appvm-syst= emd-sysupdate } >>>>>> + basename -- $id_path >>>>>> + } >>>>>> + >>>>>> + # $fsdir is read-only to the guest, but read-write to the host.= >>>>>> + # Directories bind-mounted into it are read-write to the guest.= >>>>>> + # See etc/s6-linux-init/run-image/service/vhost-user-fs/templat= e/run >>>>>> + # for details. >>>>>> + >>>>> >>>>> This still refers to a non-existent variable. >> >> Whoops! >> >>>>>> + # Set up /etc with what the VM needs. The VM will overlay this= >>>>>> + # on its own /etc. >>>>>> + # >>>>>> + # In the future, this should use a bind mount instead of copyin= g >>>>>> + # into a tmpfs. However, this would significantly complicate t= he >>>>>> + # cleanup code. Deleting fs/etc would require undoing the bind= >>>>>> + # mounts instead of rm -rf. Once this code is in a separate mo= unt >>>>>> + # namespace, the copies should be replaced by bind mounts. >>>>>> + if { >>>>>> + if { rm -rf -- /run/vm/by-id/${update_vm_id}/fs/etc } >>>>>> + umask 022 >>>>>> + if { mkdir -p -- /run/vm/by-id/${update_vm_id}/fs/updates /ru= n/vm/by-id/${update_vm_id}/fs/etc/systemd } >>>>>> + if { cp -R -- /etc/vm-sysupdate.d /etc/update-url /run/vm/by-= id/${update_vm_id}/fs/etc } >>>>>> + cp -- /etc/systemd/import-pubring.gpg /run/vm/by-id/${update_= vm_id}/fs/etc/systemd >>>>>> + } >>>>>> + >>>>>> + # If the directory is already mounted, unmount it. This preven= ts a >>>>>> + # confusing error from mount. >>>>>> + foreground { redirfd -w 2 /dev/null umount -- /run/vm/by-id/${u= pdate_vm_id}/fs/updates } >>>>>> + >>>>>> + # Share the update directory with the VM. >>>>>> + if { mount --bind -- shared /run/vm/by-id/${update_vm_id}/fs/up= dates } >>>>>> + >>>>>> + # Start the update VM. >>>>>> + if { vm-start $update_vm_id } >>>>>> + >>>>>> + # Wait for the VM to exit. >>>>>> + # TODO: This is racy. If the update finishes before this code = runs, >>>>>> + # the s6-svwait call will fail. >>>>>> + if { s6-svwait -D /run/service/vmm/instance/${update_vm_id} } >>>>>> + >>>>>> + # Remove the bind mount. >>>>>> + if { umount -- /run/vm/by-id/${update_vm_id}/fs/updates } >>>>>> + >>>>>> + # Ensure that the VM cannot change the directory >>>>>> + # while systemd-sysupdate is using it. >>>>>> + if { btrfs subvolume snapshot -- shared snapshot } >>>>>> + >>>>>> + # Validate the update directory. Delete any stale temporary fi= les. >>>>>> + # Check that a signature file was downloaded. >>>>>> + if { updates-dir-check check snapshot } >>>>>> + >>>>>> + unshare --mount >>>>>> + if { mount --bind -o ro -- snapshot /run/updater } >>>>>> + >>>>>> + /usr/lib/systemd/systemd-sysupdate update >>>>> >>>>> Why not just make a readonly snapshot? >>>>> (btrfs subvolume snapshot -r) >>>> >>>> The checker will delete any temporary files it comes across, so it >>>> needs write access. A snapshot is much heavier than a bind mount >>>> and isn't automatically cleaned up. >>> >>> Okay, but why do we need to block systemd-sysupdate from writing to t= his >>> directory, but not to anywhere else on the system? >> >> We don't. I'm fine with a writable mount. Either should work. >=20 > Then let's keep things simple and drop the unshare and mount. We can > deprivilege it properly in the future. The mount is absolutely necessary: it ensures that the update is available where the .transfer file says it will be. It just doesn't need to be read-only. 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