From owner-freebsd-current@freebsd.org Mon Sep 10 17:55:03 2018 Return-Path: Delivered-To: freebsd-current@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id B7554109798B for ; Mon, 10 Sep 2018 17:55:03 +0000 (UTC) (envelope-from freebsd-rwg@pdx.rh.CN85.dnsmgr.net) Received: from pdx.rh.CN85.dnsmgr.net (br1.CN84in.dnsmgr.net [69.59.192.140]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 3A0368DCAF; Mon, 10 Sep 2018 17:55:02 +0000 (UTC) (envelope-from freebsd-rwg@pdx.rh.CN85.dnsmgr.net) Received: from pdx.rh.CN85.dnsmgr.net (localhost [127.0.0.1]) by pdx.rh.CN85.dnsmgr.net (8.13.3/8.13.3) with ESMTP id w8AHt0W0079064; Mon, 10 Sep 2018 10:55:00 -0700 (PDT) (envelope-from freebsd-rwg@pdx.rh.CN85.dnsmgr.net) Received: (from freebsd-rwg@localhost) by pdx.rh.CN85.dnsmgr.net (8.13.3/8.13.3/Submit) id w8AHt0Yo079063; Mon, 10 Sep 2018 10:55:00 -0700 (PDT) (envelope-from freebsd-rwg) From: "Rodney W. Grimes" Message-Id: <201809101755.w8AHt0Yo079063@pdx.rh.CN85.dnsmgr.net> Subject: Re: Enabling the WITH_REPRODUCIBLE_BUILD knob for 12.0-REL In-Reply-To: <236dc4bb-956a-a103-9f59-a3492d9866f3@FreeBSD.org> To: John Baldwin Date: Mon, 10 Sep 2018 10:55:00 -0700 (PDT) CC: Ed Maste , FreeBSD Current X-Mailer: ELM [version 2.4ME+ PL121h (25)] MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 10 Sep 2018 17:55:03 -0000 > 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