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[96.60.249.169]) by smtp.gmail.com with ESMTPSA id 00721157ae682-78ad1045914sm44210587b3.53.2025.11.30.20.52.21 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 30 Nov 2025 20:52:22 -0800 (PST) Message-ID: <594830b6-d3a3-42da-84a8-190e08a353e8@gmail.com> Date: Sun, 30 Nov 2025 23:52:16 -0500 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/5] host/rootfs: create a per-VM mount namespace To: Alyssa Ross , devel@spectrum-os.org References: <20251201044534.977524-1-hi@alyssa.is> <20251201044534.977524-3-hi@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: <20251201044534.977524-3-hi@alyssa.is> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------6hQmq9BiCpWgzSiBE64enYV4" Message-ID-Hash: XKHVUEVLSPOOQQ7OEOV5227CL52Z2WOO X-Message-ID-Hash: XKHVUEVLSPOOQQ7OEOV5227CL52Z2WOO X-MailFrom: demiobenour@gmail.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-devel.spectrum-os.org-0; header-match-devel.spectrum-os.org-1; header-match-devel.spectrum-os.org-2; header-match-devel.spectrum-os.org-3; header-match-devel.spectrum-os.org-4; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header X-Mailman-Version: 3.3.9 Precedence: list List-Id: Patches and low-level development discussion Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --------------6hQmq9BiCpWgzSiBE64enYV4 Content-Type: multipart/mixed; boundary="------------pGNz1slg0TEOOQl6Bnrv3sPa"; protected-headers="v1" From: Demi Marie Obenour To: Alyssa Ross , devel@spectrum-os.org Message-ID: <594830b6-d3a3-42da-84a8-190e08a353e8@gmail.com> Subject: Re: [PATCH 2/5] host/rootfs: create a per-VM mount namespace References: <20251201044534.977524-1-hi@alyssa.is> <20251201044534.977524-3-hi@alyssa.is> In-Reply-To: <20251201044534.977524-3-hi@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 --------------pGNz1slg0TEOOQl6Bnrv3sPa Content-Type: multipart/mixed; boundary="------------aUbyS30EkBEtSXoaRJ5XHaOL" --------------aUbyS30EkBEtSXoaRJ5XHaOL Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 11/30/25 23:45, Alyssa Ross wrote: > This will solve the problem of mounts for VMs being very annoying to > clean up, as evidenced in run-appimage. It was looking to be even > worse for Flatpak. Does the updater also need to be adjusted? > Signed-off-by: Alyssa Ross > --- > .../template/data/service/dbus/run | 2 ++ > .../template/data/service/vhost-user-fs/run | 4 +-- > .../image/usr/bin/create-vm-dependencies | 23 ++++++++++++++--- > host/rootfs/image/usr/bin/run-appimage | 25 +++++++++----------= > 4 files changed, 34 insertions(+), 20 deletions(-) >=20 > diff --git a/host/rootfs/image/etc/s6-linux-init/run-image/service/vm-s= ervices/template/data/service/dbus/run b/host/rootfs/image/etc/s6-linux-i= nit/run-image/service/vm-services/template/data/service/dbus/run > index 351fc68..9b23192 100755 > --- a/host/rootfs/image/etc/s6-linux-init/run-image/service/vm-services= /template/data/service/dbus/run > +++ b/host/rootfs/image/etc/s6-linux-init/run-image/service/vm-services= /template/data/service/dbus/run > @@ -4,6 +4,8 @@ > =20 > importas -i VM VM > =20 > +nsenter --mount=3D${VM}/mount > + > dbus-daemon > --config-file /usr/share/dbus-1/session.conf > --print-address 3 > diff --git a/host/rootfs/image/etc/s6-linux-init/run-image/service/vm-s= ervices/template/data/service/vhost-user-fs/run b/host/rootfs/image/etc/s= 6-linux-init/run-image/service/vm-services/template/data/service/vhost-us= er-fs/run > index 5d5ad7d..3848b0c 100755 > --- a/host/rootfs/image/etc/s6-linux-init/run-image/service/vm-services= /template/data/service/vhost-user-fs/run > +++ b/host/rootfs/image/etc/s6-linux-init/run-image/service/vm-services= /template/data/service/vhost-user-fs/run > @@ -12,8 +12,6 @@ export TMPDIR /run > =20 > # The VM should not be able to write directly into a tmpfs, but there > # can be writable block-based bind mounted subdirectories. Comment should be moved to the code that does the bind mount. Also, this comment is somewhat stale: the main reason to prevent writing into the toplevel fs/ folder is that host tools (like the updater) assume symlinks can't be created in it. > -unshare -m --propagation slave > importas -i VM VM > -if { mount --rbind -o ro ${VM}/fs ${VM}/fs } > - > +nsenter --mount=3D${VM}/mount > virtiofsd --fd 3 --shared-dir ${VM}/fs > diff --git a/host/rootfs/image/usr/bin/create-vm-dependencies b/host/ro= otfs/image/usr/bin/create-vm-dependencies > index f3a1b69..21681cd 100755 > --- a/host/rootfs/image/usr/bin/create-vm-dependencies > +++ b/host/rootfs/image/usr/bin/create-vm-dependencies > @@ -1,11 +1,26 @@ > #!/bin/execlineb -S1 > # SPDX-License-Identifier: EUPL-1.2+ > -# SPDX-FileCopyrightText: 2024 Alyssa Ross > +# SPDX-FileCopyrightText: 2024-2025 Alyssa Ross > =20 > -if { mount -m --rbind -o nofail /run/vm/by-id/${1}/config/fs /run/vm/b= y-id/${1}/fs/config } > +if { touch /run/vm/by-id/${1}/mount } > +if { mount --make-private --bind /run/vm/by-id/${1}/mount /run/vm/by-i= d/${1}/mount } > =20 > -if { mkdir -p /run/vm/by-id/${1}/doc-run/doc /run/vm/by-id/${1}/fs/doc= } > -if { mount --rbind /run/vm/by-id/${1}/doc-run/doc /run/vm/by-id/${1}/f= s/doc } > +if { > + unshare --mount=3D/run/vm/by-id/${1}/mount > + > + if { > + mkdir -p > + /run/vm/by-id/${1}/doc-run/doc > + /run/vm/by-id/${1}/fs/config > + /run/vm/by-id/${1}/fs/doc I would also create /run/vm/by-id/${1}/config/fs... > + } > + > + if { mount --make-shared --rbind /run/vm/by-id/${1} /run/vm/by-id/${= 1} } > + > + if { mount --rbind -o ro /run/vm/by-id/${1}/fs /run/vm/by-id/${1}/fs= } VMs should not be able to write to their own config, so this and the next like should be swapped. > + if { mount --rbind -o nofail /run/vm/by-id/${1}/config/fs /run/vm/by= -id/${1}/fs/config } =2E..and remove this `-o nofail`. > + mount --rbind /run/vm/by-id/${1}/doc-run/doc /run/vm/by-id/${1}/fs/d= oc > +} > > if { s6-instance-create /run/service/vm-services $1 } > elglob -0 services /run/service/vm-services/instance/${1}/services/* > diff --git a/host/rootfs/image/usr/bin/run-appimage b/host/rootfs/image= /usr/bin/run-appimage > index 6ccc61f..f2fe7bc 100755 > --- a/host/rootfs/image/usr/bin/run-appimage > +++ b/host/rootfs/image/usr/bin/run-appimage > @@ -1,14 +1,12 @@ > #!/bin/execlineb -S1 > # SPDX-License-Identifier: EUPL-1.2+ > -# SPDX-FileCopyrightText: 2024 Alyssa Ross > +# SPDX-FileCopyrightText: 2024-2025 Alyssa Ross > =20 > backtick -E dir { mktemp -d /run/vm/by-id/XXXXXX } > backtick -E id { basename -- $dir } > =20 > if { mkdir -p /run/configs/${id}/fs } > -if { redirfd -w 1 /run/configs/${id}/fs/type echo appimage } > -if { touch /run/configs/${id}/fs/run } > -if { mount --rbind $1 /run/configs/${id}/fs/run } > + > if { > ln -s /usr/lib/spectrum/img/appvm/blk /usr/lib/spectrum/img/appvm/vm= linux > /run/configs/${id} > @@ -18,6 +16,14 @@ if { ln -s /run/configs/${id} ${dir}/config } > =20 > if { create-vm-dependencies $id } > =20 > +if { > + nsenter --mount=3D${dir}/mount > + cd ${dir}/fs/config > + if { redirfd -w 1 type echo appimage } > + if { touch run } > + mount --bind $1 run > +} > + > piperw 4 3 > background { > fdclose 3 > @@ -34,13 +40,6 @@ fdclose 3 > =20 > if { s6-instance-delete /run/service/vm-services $id } > =20 > -if { > - forx -E mount { > - /run/configs/${id}/fs/run > - ${dir}/fs/config > - ${dir}/fs/doc > - } > - umount $mount > -} > - > +if { umount ${dir}/mount } # mount namespace > +if { umount ${dir}/mount } # private bind mount > rm -r $dir /run/configs/${id} --=20 Sincerely, Demi Marie Obenour (she/her/hers) --------------aUbyS30EkBEtSXoaRJ5XHaOL Content-Type: application/pgp-keys; name="OpenPGP_0xB288B55FFF9C22C1.asc" Content-Disposition: attachment; filename="OpenPGP_0xB288B55FFF9C22C1.asc" Content-Description: OpenPGP public key Content-Transfer-Encoding: quoted-printable -----BEGIN PGP PUBLIC KEY BLOCK----- xsFNBFp+A0oBEADffj6anl9/BHhUSxGTICeVl2tob7hPDdhHNgPR4C8xlYt5q49y 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