Date: Mon, 8 Jul 1996 01:30:07 -0700 (PDT) From: Bruce Evans <bde@zeta.org.au> To: freebsd-bugs Subject: Re: bin/1375: Extraneous warning from mv(1) Message-ID: <199607080830.BAA16658@freefall.freebsd.org>
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The following reply was made to PR bin/1375; it has been noted by GNATS. From: Bruce Evans <bde@zeta.org.au> To: FreeBSD-gnats-submit@FreeBSD.org, james@jraynard.demon.co.uk Cc: Subject: Re: bin/1375: Extraneous warning from mv(1) Date: Mon, 8 Jul 1996 18:24:01 +1000 >According to mv(1), moving a file across filesystems is equivalent to >calling cp -pRP, surrounded by calls to rm(1). According to cp(1), >when the -p option is used, no error message should be displayed if >the user and group ID of the file cannot be preserved. This is probably a bug in mv.1. mv should and does try harder than cp to preserve attributes. >mv(1) behaves as expected if the file and its destination directory >are on the same filesystem, or if a directory is moved across a >filesystem instead of a file. The latter is a bug in mv. It really does use cp -pRP in this case, but cp -pRP is inadequate. It snaps links, doesn't preserve preservable directory timestamps, and does the wrong thing for `mv dir existing-dir'. There should also be warnings for failures to preserve flags. The fastcopy() case of mv doesn't actually attempt to preserve flags, although the cp -pRP case does (try `touch /tmp/z; chflags nodump /tmp/z; mv /tmp/z anotherfs'). Bruce
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