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Mon, 13 Jul 2026 10:27:14 -0700 (PDT) Received: from [10.138.10.6] ([185.98.168.14]) by smtp.gmail.com with ESMTPSA id 00721157ae682-81e6c199c5asm120022847b3.32.2026.07.13.10.27.12 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 13 Jul 2026 10:27:13 -0700 (PDT) Message-ID: <39d4b506-294a-4ac1-b748-dcd05a8a11fe@gmail.com> Date: Mon, 13 Jul 2026 13:27:07 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 01/22] host/rootfs: Mount filesystems before s6-rc-init To: Alyssa Ross References: <20260711-cgroups-v3-0-5cba61a20cba@gmail.com> <20260711-cgroups-v3-1-5cba61a20cba@gmail.com> <8733xn1b5p.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: <8733xn1b5p.fsf@alyssa.is> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------B0o4EwvtKfOs2ceI7CGSQLzi" Message-ID-Hash: 4O2EZS6SPNRN7ZETOJI2LRVWGTOXVFJV X-Message-ID-Hash: 4O2EZS6SPNRN7ZETOJI2LRVWGTOXVFJV X-MailFrom: demiobenour@gmail.com X-Mailman-Rule-Hits: member-moderation X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; loop; banned-address; 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; emergency CC: Spectrum OS Development X-Mailman-Version: 3.3.10 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) --------------B0o4EwvtKfOs2ceI7CGSQLzi Content-Type: multipart/mixed; boundary="------------EipVm5bdMdAsPhZZ7KlhHsSU"; protected-headers="v1"; hp="clear" Message-ID: <39d4b506-294a-4ac1-b748-dcd05a8a11fe@gmail.com> Date: Mon, 13 Jul 2026 13:27:07 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 01/22] host/rootfs: Mount filesystems before s6-rc-init To: Alyssa Ross Cc: Spectrum OS Development References: <20260711-cgroups-v3-0-5cba61a20cba@gmail.com> <20260711-cgroups-v3-1-5cba61a20cba@gmail.com> <8733xn1b5p.fsf@alyssa.is> Content-Language: en-US From: Demi Marie Obenour Autocrypt: addr=demiobenour@gmail.com; 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charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 7/13/26 05:39, Alyssa Ross wrote: > Demi Marie Obenour writes: >=20 >> cgroup-setup is written in Rust and uses the Rust standard library. >> It also relies on cgroupfs being mounted at /sys/fs/cgroup. >> Furthermore, it runs very, *very* early on, since it sets up the cgrou= ps >> in which s6-svscan and s6-supervise processes run. This allows settin= g >> up sub-cgroups without having to worry about name collisions. >> >> While it would be possible to only mount the bare minimum necessary, >> it's simpler to just mount everything before starting any services. >> These mounts are all pseudo-filesystems or tmpfs instances, and none >> have any dependencies. >> >> Signed-off-by: Demi Marie Obenour >> --- >> host/rootfs/image/etc/init | 11 ++++++++++- >> host/rootfs/image/etc/s6-linux-init/scripts/rc.init | 9 +-------- >> 2 files changed, 11 insertions(+), 9 deletions(-) >> >> diff --git a/host/rootfs/image/etc/init b/host/rootfs/image/etc/init >> index db8a6d9c747e3d212c21b6c983c8f7e299822abe..8ec7859ab00e24007a93d4= 000c8f34e353de50ae 100755 >> --- a/host/rootfs/image/etc/init >> +++ b/host/rootfs/image/etc/init >> @@ -1,6 +1,15 @@ >> #!/bin/execlineb -Ws0 >> # SPDX-License-Identifier: EUPL-1.2+ >> -# SPDX-FileCopyrightText: 2022 Alyssa Ross >> +# SPDX-FileCopyrightText: 2020-2022, 2024 Alyssa Ross >> =20 >> /bin/setpriv --no-new-privs -- >> + >> +if { /bin/ln -s /proc/self/fd /dev } >> +if { /bin/ln -s /proc/self/fd/0 /dev/stdin } >> +if { /bin/ln -s /proc/self/fd/1 /dev/stdout } >> +if { /bin/ln -s /proc/self/fd/2 /dev/stderr } >=20 > I guess the idea is that the Rust standard library might want these? I don't know if it actually does, though I would not be surprised if it is not tested without them. What *is* necessary is for a cgroup filesystem to be mounted at /sys/fs/cgroup. This allows setting up cgroup controllers and moving PID 1 to a sub-cgroup. >> + >> +if { /bin/mount --make-shared / } >> +if { /bin/mount -a --mkdir } >> + >> /bin/s6-linux-init -c /etc/s6-linux-init -s /run/param -- $@ >> diff --git a/host/rootfs/image/etc/s6-linux-init/scripts/rc.init b/hos= t/rootfs/image/etc/s6-linux-init/scripts/rc.init >> index f638e373589884acb959c868462fdf532380a851..fba305c4e9cbb9f7535f11= bb4c06d8da8a34837b 100755 >> --- a/host/rootfs/image/etc/s6-linux-init/scripts/rc.init >> +++ b/host/rootfs/image/etc/s6-linux-init/scripts/rc.init >> @@ -4,13 +4,6 @@ >> =20 >> if { s6-rc-init -c /etc/s6-rc /run/service } >> =20 >> -if { ln -s /proc/self/fd /dev } >> -if { ln -s /proc/self/fd/0 /dev/stdin } >> -if { ln -s /proc/self/fd/1 /dev/stdout } >> -if { ln -s /proc/self/fd/2 /dev/stderr } >> - >> -if { mount --make-shared / } >> -if { mount --make-shared /run } >> -if { mount -a --mkdir } >> +if { /bin/mount --make-shared /run } >=20 > Presumably this does not actually suddenly need an absolute path. You are correct. >> =20 >> s6-rc change ok-all --=20 Sincerely, Demi Marie Obenour (she/her/hers) --------------EipVm5bdMdAsPhZZ7KlhHsSU-- --------------B0o4EwvtKfOs2ceI7CGSQLzi Content-Type: application/pgp-signature; name="OpenPGP_signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="OpenPGP_signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEopQtqVJW1aeuo9/sszaHOrMp8lMFAmpVH+wACgkQszaHOrMp 8lOZEw/9FpFijDRkyntf5dp0J/XMLA0+VbKEA1WpGsFsPmFEfWiyS4q5ncvzedEA uV0pPcDyFY4dd/qb53OmyUomOJ080mKkdrKE4L6joJ21iUUOiaofvJ0VdefbTeZI DOhR8QVxknc+lKYF+bD9pX8lm17R70sPjBV1z3gJ2TokyDY2/1El4tN80Nntw87l mgV/yJi4VQnU/POSjVmtVXzaVl+5/r06aCBb3vzCYz6v3nDzGUm7qCEpvs2i78Og ghjguTrtLIqm447v4yb1alQDzEtbvDjsEOjsqwVPOvWV7tJpT9NTRLI5f6kh4nhK vRLCrIFVCsvLb80tEksN9yrx7lb57ROldWGDcXOX8bbcg3lwkZuU7yZgsu+ly+tB qr5htKSgItUhQXcD0ns58EjEiCu8SHiRs5tMiMUv007/yb4VQWRv056DX7XgGrzQ 6kdeubdxsdA9fa5eJ2wtuC/B3wJi446php2ASWRUDDqN5hRH0eXaYODEhlGdLAYd GYkCLhtBrXeFnXJ1JCg5Xj2epK4WSS3u1HiFr+UgMuHLnGQ/LspJ1Vw2NqJnjnLE 8OzwoDLvXCuTs1Bte0dCNQisbWMqdiU1qU+iGxzXN9yIg6QT8DKJqPLrHhbqgKi4 65YrTESGcNNNj6cxskKY9s73BmZbCe4x8oZpu8ASl0BduLaHiYI= =HPPH -----END PGP SIGNATURE----- --------------B0o4EwvtKfOs2ceI7CGSQLzi--