On Fri, 30 Aug 2013 10:00:35 -0400 Glenn Fowler wrote:
> On Fri, 30 Aug 2013 13:04:17 +0200 Simon Toedt wrote:
> > On Fri, Aug 30, 2013 at 7:11 AM, Glenn Fowler <[email protected]> wrote:
> > >
> > > On Fri, 30 Aug 2013 04:53:04 +0200 Cedric Blancher wrote:
> > >> On 29 August 2013 19:45, Glenn Fowler <[email protected]> wrote:
> > >> >
> > >> > the AT&T Software Technology ast alpha 2013-08-29 source release
> > >> > has been posted to the download site
> > >> > http://www.research.att.com/sw/download/alpha/
> > >> > the package names and md5 checksums are
> > >> > INIT 132e0403af573fa1cb1e202267fedeb8
> > >> > ast-open 334615fb3a652575106194c281d27b5c
> > >> > ast-ksh ebcc56d9ab673aaafbb163d6eee1a93c
> > >> > the md5 sums should match the ones listed on the download page
> > >> >
> > >> > this is still a work in progress, but we are getting closer to a beta
> > >
> > >> No, you don't. This release if OFFICIALLY broken beyond usability and
> > >> USELESS.
> > >> You really had to try and tinker with cd -@ again, did you? I'm really
> > >> angry. cd .. no longer works within NFSv4 xattr directories, e.g.
> > >> echo "" >x ; cd -@ x ; touch xattr ; cd .. ; rm x now fails with a cd:
> > >> /home/ced/prod4/test19/x//@//..: [Not a directory]
> > >
> > > hey gsf, there's a problem with the way you did foo
> > > here's a sequence of commands / code that shows the problem
> > >
> > > its a bug
> > > patch is below
> > > with ksh builtins like wc you should be able to do things like
> > >
> > > wc /home/ced/prod4/test19/x//@//xattr
> > >
> > > and you get a pwd that can be passed on to other processes and used
> > > long after your process dies
> > >
> > > /home/ced/prod4/test19/x//@//
> > Is this some late Aprils Fool joke or is this serious? How do you
> > prevent that someone clobbers his path together from variables or
> > through printf and accidentally creates a path like that?
> > ksh -c 'typeset -a a=( /foo bar /baz/ /@ / /append/ /bum ) ; IFS="/" ;
> > printf "%s\n" "${a[*]}"'
> > /foo/bar//baz///@////append///bum
> > That strikes me as extra risky strategy.
> alright
> I got most of the feedback I needed to understand the (non-)namespace
> working on an update
> I do have one more question from the first "cd -@" example
> cd -@ t.c
> cd ..
> if t.c is a regular file and O_XATTR(t.c) really hangs in a nameless part of
> the filesystem
> how can ".." inside the O_XATTR(t.c) xattr dir have any meaning other than
> ".. points to the parent object"
> indeed ls -ail inside O_XATTR(t.c) shows .. as a regular file
> and /bin/pwd (without hints from $PWD) chokes because .. is not a directory
> so if the sequence
> cd -@ t.c
> cd ..
> really does get you back where you started in a solaris shell:
> how does the documentation rationalize that?
I think I have the answer to my own question
when you "cd -@" you are not in a place named by a path but instead in a place
named by an fd
so all relative paths in that fd dir are relative to the fd
which then makes "cd .." from within "/dev/file/xattr@somepath" ambiguous when
viewed
as a path operation "/dev/file/xattr@somepath" + ".." =>
""/dev/file/xattr@somepath/.." (ambiguous)
I don't have a solaris with a shell with working "cd -@"
what is is the output of the sh pwd in a solaris /bin/sh:
cd -@ t.c
cd ..
pwd
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