Date: Tue, 2 Mar 2021 07:43:13 +0000 From: Graham Perrin <grahamperrin@gmail.com> To: freebsd-questions@freebsd.org Cc: Warner Losh <imp@bsdimp.com> Subject: System updates/upgrades: single user mode, and chroot approaches Message-ID: <5587a9c8-519e-f5db-96cd-d34c29600fbc@gmail.com> In-Reply-To: <FE16C41A-1ECC-46B9-A8B1-B7B1EDC1E411@FreeBSD.org> References: <20210228023827.f68e6136d688c0a37206c883@3dresearch.com> <CAHu1Y73iJi=A9vwzOWM90zb2uD1pU9VZfwRJLdeZ6AhRF0nb9A@mail.gmail.com> <20210228120313.cdb53cab429a38fdf9817d0d@3dresearch.com> <CAHu1Y70DCR4z8D85ixc2z2GwwY%2BhsK263QsJuq--BQCmByA9GA@mail.gmail.com> <FE16C41A-1ECC-46B9-A8B1-B7B1EDC1E411@FreeBSD.org>
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On 28/02/2021 23:52, Garance A Drosehn wrote: Re: Panic after updating from source > On 28 Feb 2021, at 13:04, Michael Sierchio wrote: > >> … if you don't installworld before >> booting, you can have a mismatch between userland and kernel interfaces. >> >> make buildworld && make kernel && make installworld && reboot >> >> that always works for me when following a -STABLE branch. > It may happen to work for you many times in a row, until the day > it does not work and then you're screwed. The official instructions > state that you should always reboot into single-user mode before > doing 'make installworld'. > > The instructions are what they are based on a lot of experience. > … > > We have frequently seen people who are furious when their system > breaks after they've upgraded from source, and frequently the reason > their system broke is that they "got away" with cutting corners for > 20 times in a row. And then they hit the first time that they were > not able get away with cutting corners. And they always blame us > developers when in fact they're not following instructions. > > To quote from /usr/src/UPDATING: > > ... Then, carefully follow the full procedure documented below > under the heading "To rebuild everything and install it on the > current system." > Specifically, a reboot is -> required <- after installing the > new kernel before installing world. While an installworld > normally works -> by accident <- from multiuser after rebooting > the proper kernel, there are many cases where this will fail > across this upgrade and installworld from single user is > required. > > … Thanks to Garance for these insights. I do routinely read the upper sections of /usr/src/UPDATING however until now, I never realised the existence of the COMMON ITEMS section at the foot of the page, below the 20131010 line. Not realised because I have not used FreeBSD for so long. I stopped paging down, near a point in time before which I never updated. /usr/src/UPDATING might benefit from a hint, near the head of the page, to read the COMMON ITEMS section at the foot. It's remarkable that <https://docs.freebsd.org/en/books/handbook/cutting-edge/#updating-src-quick-start>; makes no mention of single user mode. ---- Upgrade FreeBSD with ZFS Boot Environments | 𝚟𝚎𝚛𝚖𝚊𝚍𝚎𝚗 <https://vermaden.wordpress.com/2021/02/23/upgrade-freebsd-with-zfs-boot-environments/>; – there's a chroot approach to streamlining, where freebsd-update(8) can be used. Please, can you think of any special precautions? Re: <https://github.com/helloSystem/Utilities/issues/33#issuecomment-780989454>; (FreeBSD pure in the midst of a discussion about FreeBSD-based helloSystem) if I'm not mistaken, there's an edge case risk of shooting oneself in the foot if the user does follow the on-screen instruction: Run `/usr/sbin/freebsd-udpate fetch` first. – at a point during the streamlining where fetch and install need not (probably must not) be performed. Regards Graham
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