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Re: bootstrap symlink dependencies

From: Eric Blake
Subject: Re: bootstrap symlink dependencies
Date: Mon, 16 May 2011 13:43:53 -0600
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On 05/16/2011 01:40 PM, Paul Eggert wrote:
> lswords=`ls -1diL "$src" "$dst" 2>/dev/null` &&
> inum= && \
> for lsword in $lswords; do
>   case $lsword in
>     *[!0-9]*) ;;
>     *) if test -z "$inum"; then
>          inum=$lsword
>        elif test $inum -ne $lsword; then
>        inum=
>        break
>        fi ;;
>   esac
> done &&
> test -n "$inum"
> This uses just one fork+exec too, but it doesn't use the
> XSI notion of %% and ##.  It can be fooled if "$src"
> or "$dst" contains an integer surrounded by spaces, but
> any such errors cause it to fail in a conservative way
> (by doing needless remakes), and these errors should be
> rare so that's not so bad.
> It assumes [!0-9] works, though;
> is that a safe assumption these days?

Yes, autoconf has been using [!...] negated shell patterns for years
now, with no problems on Solaris /bin/sh or any other shell.

Eric Blake   address@hidden    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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