Date: Wed, 21 Aug 2019 21:32:33 +0200 From: Oliver Pinter <oliver.pinter@hardenedbsd.org> To: Gordon Bergling <gbergling@gmail.com> Cc: "Rodney W. Grimes" <freebsd-rwg@gndrsh.dnsmgr.net>, "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org>, Ian Lepore <ian@freebsd.org> Subject: Re: uname -a default options Message-ID: <CAPQ4ffsX1ZtfXt_djsCJYbg7G6OFB2rZQVf_rzCdrBxUf2LiDw@mail.gmail.com> In-Reply-To: <67A10C58-7A1A-4E8E-A567-6A2AD3E195B1@gmail.com> References: <201908171616.x7HGGhpK036345@gndrsh.dnsmgr.net> <67A10C58-7A1A-4E8E-A567-6A2AD3E195B1@gmail.com>
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On Wednesday, August 21, 2019, Gordon Bergling <gbergling@gmail.com> wrote: > Hi Rod, > > after reading the POSIX spec [1] I agree that the default options behind > =E2=80=9E-a" can not be changed. > > While reading the source of usr.bin/uname/uname.c I recognized that > FreeBSD=E2=80=99s uname is getting its information from sysctl calls. Can= you point > me to right direction where in sys/ the sysctl =E2=80=9Ekern.version=E2= =80=9C (KERN_VERSION > internally) is set? > > I would like create a small patch that changes =E2=80=9E-v=E2=80=9C > from "FreeBSD 12.0-STABLE r351343 GENERIC=E2=80=9C > to =E2=80=9Er351343 GENERIC=E2=80=9C for a further discussion. Please no. Keep them at the current behavior. > > Kind Regards, > > Gordon > > [1] https://pubs.opengroup.org/onlinepubs/9699919799/utilities/uname.html > > > Am 17.08.2019 um 18:16 schrieb Rodney W. Grimes < > freebsd-rwg@gndrsh.dnsmgr.net>: > > > >> On Sat, 2019-08-17 at 15:08 +0200, Gordon Bergling wrote: > >>> Hello List, > >>> > >>> "uname -a" is currently mapping the -a option to ?-mnrsv?, which > >>> results in something similar like > >>> > >>> $ uname -a > >>> FreeBSD lion.0xfce3.net <http://lion.0xfce3.net/>; 12.0-STABLE FreeBSD > >>> 12.0-STABLE r350835 GENERIC amd64 > >>> > >>> What would you think about reducing the option mapping for ?-a? to ?- > >>> vmn? , which would result in a less repetitive version string like > >>> the one below. > >>> > >>> $ uname -vmn > >>> lion.0xfce3.net <http://lion.0xfce3.net/>; FreeBSD 12.0-STABLE r350835 > >>> GENERIC amd64 > >>> > >>> Adapting this would be trivial, but before I hack something together, > >>> I would like to get some feedback if such a change would be welcomed? > >>> > >>> Best regards, > >>> > >>> Gordon > >>> > >> > >> I think there are likely very many existing scripts in the world that > >> parse the output of uname -a and would break if the fields moved aroun= d > >> or disappeared. > > > > I agree that we should not change the output of uname -a, for one > > it is a POSIX spec'ed command, though I would not expect scripts > > to be parsing the output of -a, they should actually invoke the > > more specific item(s) they need and parse those, a much less error > > prone methods. > > > > I would however like to note that Linux (or atleast Ubuntu 19.04) > > has a man page that -a says "All of the below" and are infact returning > > more info than the Posix man page which says -a is -mnrsv > > > > rgrimes@mgmt:~$ uname -a > > Linux mgmt 5.1.0-rc2+ #14 SMP Sun Aug 4 09:23:12 UTC 2019 x86_64 x86_64 > x86_64 GNU/Linux > > rgrimes@mgmt:~$ man uname > > rgrimes@mgmt:~$ uname -mnrsv > > Linux mgmt 5.1.0-rc2+ #14 SMP Sun Aug 4 09:23:12 UTC 2019 x86_64 > > rgrimes@mgmt:~$ uname -m > > x86_64 > > rgrimes@mgmt:~$ uname -n > > mgmt > > rgrimes@mgmt:~$ uname -r > > 5.1.0-rc2+ > > rgrimes@mgmt:~$ uname -s > > Linux > > rgrimes@mgmt:~$ uname -v > > #14 SMP Sun Aug 4 09:23:12 UTC 2019 > > > > FreeBSD: > > root {1003}# uname -a > > FreeBSD w530a.dnsmgr.net 12.0-RELEASE FreeBSD 12.0-RELEASE r341666 > GENERIC amd64 > > root {1004}# uname -m > > amd64 > > root {1005}# uname -n > > w530a.dnsmgr.net > > root {1006}# uname -r > > 12.0-RELEASE > > root {1007}# uname -s > > FreeBSD > > root {1008}# uname -v > > FreeBSD 12.0-RELEASE r341666 GENERIC > > > > So it is really our -v string that is full of redundant > > data that MAY want to be evaluated for trimming. > > > > -- > > Rod Grimes > rgrimes@freebsd.org > > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org= " >
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