Date: 28 Jul 2002 22:30:58 -0000 From: "Andrew Reilly" <areilly@bigpond.net.au> To: FreeBSD-gnats-submit@FreeBSD.org Subject: docs/41089: pax -B option does not mention interaction with -z option Message-ID: <20020728223058.10888.qmail@areilly.bpc-users.org>
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>Number: 41089
>Category: docs
>Synopsis: pax -B option does not mention interaction with -z option
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-doc
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: change-request
>Submitter-Id: current-users
>Arrival-Date: Sun Jul 28 15:40:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator: Andrew Reilly
>Release: FreeBSD 4.6-STABLE i386
>Organization:
>Environment:
System: FreeBSD gurney.reilly.home 4.6-STABLE FreeBSD 4.6-STABLE #1: Sat Jul 27 10:14:36 EST 2002 root@gurney.reilly.home:/usr_plus/obj/usr_plus/src/sys/GURNEY i386
P3-500, FreeBSD as above, target same, standard
libraries.
>Description:
-B option of pax says that it limits the number of bytes
written to a volume, but when the -z option is also used
the number of bytes written is less than that specified,
by the compression ratio. For example, see
How-To-Repeat.
>How-To-Repeat:
You won't get the same result, because you don't have my
file system contents, but any file tree should do (other
than one full of MP3 files or the like...)
pax -w -t -z -f /backup/full-${today_d}.pax -B667m $dirs
resulted in the warning message
"pax: User specified archive volume byte limit reached."
but a subsequent listing of the /backup directory shows:
-rw-r--r-- 1 root wheel 352215042 Jul 29 03:11 full-020729.pax
>Fix:
Add a sentence or two to the description of the -B option
along the lines of:
"Note that the specified size is for the pax image
itself. If the -z option is also used, the resulting
file may contain fewer bytes, according to the
compressability of the archive contents."
Alternatively, perhaps the pax author could be persuaded
to run the archive size counter on the _output_ of the
gzip pipe? That would certainly be more useful.
>Release-Note:
>Audit-Trail:
>Unformatted:
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