Date: Mon, 10 Sep 2018 10:55:00 -0700 (PDT) From: "Rodney W. Grimes" <freebsd-rwg@pdx.rh.CN85.dnsmgr.net> To: John Baldwin <jhb@FreeBSD.org> Cc: Ed Maste <emaste@FreeBSD.org>, FreeBSD Current <freebsd-current@FreeBSD.org> Subject: Re: Enabling the WITH_REPRODUCIBLE_BUILD knob for 12.0-REL Message-ID: <201809101755.w8AHt0Yo079063@pdx.rh.CN85.dnsmgr.net> In-Reply-To: <236dc4bb-956a-a103-9f59-a3492d9866f3@FreeBSD.org>
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> On 9/10/18 9:51 AM, Rodney W. Grimes wrote: > >> The FreeBSD base system is a reproducible build[1] with a minor > >> exception: the build metadata (timestamps, user, hostname, etc.) > >> included in the kernel and loader. > >> > >> With the default, non-reproducible build the kernel ident looks like: > >> > >> FreeBSD 12.0-ALPHA5 #4 r338195: Mon Jan 1 10:11:12 EDT 2018 > >> user@hostname:/path/to/freebsd/src > >> > >> and the loader ident: > >> > >> FreeBSD/amd64 EFI loader, Revision 1.1 > >> (Mon Jan 1 10:11:12 EDT 2018 user@hostname) > >> > >> With reproducible builds enabled the kernel ident looks like: > >> > >> FreeBSD 12.0-ALPHA5 r338195 > >> > >> and the loader ident: > >> > >> FreeBSD/amd64 EFI loader, Revision 1.1 > >> > >> I would like to enable the REPRODUCIBLE_BUILD knob by default for the > >> 12.0 release, and propose we do this by adding a step to switch the > >> default to the list of changes[2] that re@ commits to the branch as > >> part of the release process. > > > > Why not just turn this on and leave it on? > > For kernels not built against a pristine tree the extra info is useful to > have. For better or worse, kgdb also parses the path to try to find > kernel.full (used by e.g. 'kgdb -n last'), so if you remove the path it > won't be able to find the matching kernel using its current logic. So this means stable/12 users would have hassles getting kgdb to work? > crashinfo uses different logic so will still work fine (crashinfo looks > for all the things matching /boot/*/kernel and tries them all until it finds > a match). > > -- > John Baldwin > > ???????????????????????????????????????????????????????????????????????????? > -- Rod Grimes rgrimes@freebsd.org
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