Date: Tue, 12 Mar 2019 12:38:11 +0100 (CET) From: =?ISO-8859-1?Q?Trond_Endrest=F8l?= <Trond.Endrestol@fagskolen.gjovik.no> To: FreeBSD current <freebsd-current@freebsd.org> Subject: Re: ZFS no longer mounted in alphanumerical order Message-ID: <alpine.BSF.2.21.9999.1903121237090.315@mail.fig.ol.no> In-Reply-To: <alpine.BSF.2.21.9999.1903121211370.315@mail.fig.ol.no> References: <201903120012.x2C0CeeJ012446@gndrsh.dnsmgr.net> <e45bc5ab-af40-ad75-b5b2-8b0830aa915a@FreeBSD.org> <alpine.BSF.2.21.9999.1903121034570.315@mail.fig.ol.no> <97B0EDCF-355F-4600-8316-2B12473445A4@transactionware.com> <alpine.BSF.2.21.9999.1903121211370.315@mail.fig.ol.no>
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On Tue, 12 Mar 2019 12:14+0100, Trond Endrestøl wrote:
> On Tue, 12 Mar 2019 11:37+0100, Jan Martin Mikkelsen wrote:
>
> > > On 12 Mar 2019, at 10:37, Trond Endrestøl <Trond.Endrestol@fagskolen.gjovik.no> wrote:
> > > I concocted a shell script, it looks promising:
> > >
> > > #!/bin/sh
> > > #-
> > > # Parallel mounting of ZFS filesystems leaves a chaotic listing of
> > > # mounted filesystems when viewed by df(1).
> > > # Separating the header from the remaining lines and sorting the
> > > # latter before recombining is a viable solution.
> > > #-
> > >
> > > DF=/bin/df
> > >
> > > ${DF} ${@} | grep ^Filesystem
> > > ${DF} ${@} | grep -v ^Filesystem | sort -k 6
> > >
> > > # new-df.sh
> >
> > An alternative sort approach, which handles df arguments which change the number of columns, and only invokes df once:
> >
> > ${DF} "$@" | awk '/^Filesystem/ { print; sort = "sort -k " NF } ! /^Filesystem/ { print | sort }’
>
> Well, yes and no, mostly no.
>
> Why are we feeding each line from df(1) separately to sort(1)?
> It defeats the entire purpose. No sorting takes place.
>
> We might be better off accumulating the majority of the lines and
> sorting them in an END block.
How about this?
/bin/df ${@} | /usr/bin/awk '/^Filesystem/ { print; sort = "/usr/bin/sort -sk " NF-1 } ! /^Filesystem/ { if (length(acc) > 0) acc = acc "\n" $0; else acc = $0; } END { print acc | sort }'
--
Trond.
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Subject: Re: ZFS no longer mounted in alphanumerical order
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On Tue, 12 Mar 2019 13:27+0200, Andriy Gapon wrote:
> On 12/03/2019 11:37, Trond Endrestøl wrote:
> > # Parallel mounting of ZFS filesystems leaves a chaotic listing of
> > # mounted filesystems when viewed by df(1).
>
> df reports filesystems in the order they were mounted.
> If you unmount and remount a filesystem or mount a new filesystem, you can see
> it for yourself. Also, if you ever used fstab then you could see that too.
> Just because previously the output happened to look like it was sorted does not
> mean that it was or that there was such an intention.
I am aware of all of this. I was caught by surprise when my ZFS
filesystems appeared partially ordered.
I know that / and /dev are mounted by the kernel, and sometime later
the remaining UFS/ZFS filesystems, and I also have a few synthetic
filesystems mounted late in the boot process, and the latter ones
(still) appear at the end of df(1)'s output.
Order has somewhat been restored. Maybe it's no biggie.
--
Trond.
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Subject: Re: ZFS no longer mounted in alphanumerical order
From: Jan Martin Mikkelsen <janm@transactionware.com>
In-Reply-To: <alpine.BSF.2.21.9999.1903121211370.315@mail.fig.ol.no>
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> On 12 Mar 2019, at 12:14, Trond Endrest=C3=B8l =
<Trond.Endrestol@fagskolen.gjovik.no> wrote:
>> An alternative sort approach, which handles df arguments which change =
the number of columns, and only invokes df once:
>>=20
>> ${DF} "$@" | awk '/^Filesystem/ { print; sort =3D "sort -k " NF } ! =
/^Filesystem/ { print | sort }=E2=80=99
>=20
> Well, yes and no, mostly no.
>=20
> Why are we feeding each line from df(1) separately to sort(1)?
> It defeats the entire purpose. No sorting takes place.
>=20
> We might be better off accumulating the majority of the lines and=20
> sorting them in an END block.
That=E2=80=99s not how awk works. It maintains a pipe and feeds each =
line to the same sort process.
There is another bug there, of course. The field number should be (NF - =
1) because of the space in the =E2=80=9CMounted on=E2=80=9D header on =
the last column. That=E2=80=99s what I get for just typing code into an =
email.
Regards,
Jan M.
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