Re: Enabling the WITH_REPRODUCIBLE_BUILD knob for 12.0-REL

Hi Ed,

I think that sounds great. In the future, could we go even further and, 
by default, only emit date/user/path if the source tree is “dirty” 
with respect to SVN? If the build really is reproducible, that data 
should only be informative when building something that doesn’t match 
a FreeBSD SVN revision (e.g., a Git commit in a local repo or a tree 
with local changes).

Cheers,


Jon
-- 
jonathan_at_FreeBSD.org


On 10 Sep 2018, at 12:26, Ed Maste 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_at_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_at_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_at_ commits to the branch as
> part of the release process.
>
> [1] https://reproducible-builds.org
> [2] 
> https://www.freebsd.org/doc/en_US.ISO8859-1/articles/freebsd-releng/releng-head.html
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