mkshortcut fails when run from setup, postinstall/cygwin-doc.sh - not otherwise
Eric Blake
eblake@redhat.com
Wed Dec 20 16:37:00 GMT 2017
On 12/20/2017 06:59 AM, Enrique Perez-Terron wrote:
> So I have added a line "set -x" at the top in postinstall/cygwin-doc.sh,
> and the relevant section becomes
>
> Â + read target name desc
> Â + '[' -r ']'
>
>
> (by the way -- this reveals another bug too: The script says "[ -r $t ]
> && $mks ..." where I am sure it should be "[ -r $target ] && $mks ...")
Or, rather,
[ -r "$target" ]
It is almost always a bug to use [ ] without quoting "$..." expansions,
because if the expansion of $... is empty, it changes the number of
arguments to [ and thus the test that [ performs.
If your script uses #!/bin/bash, then you can use bashisms like:
[[ -r $target ]]
which do the right thing ('[[' is part of the shell grammar, rather than
treated like an executable; as such, you can safely omit quoting in that
form; but '[[' is not yet POSIX and is not supported on dash).
> (and again btw, I am not sure bash should count "[ -r ]" as a true
> statement)
I am. POSIX requires that behavior. Any time you have exactly one
argument to '[', the result is true unless that argument was the empty
string.
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3266
Virtualization: qemu.org | libvirt.org
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