No, you have to:
(a) create a unique, pid specific file name /var/tmp/myapp.$$.xyzzy
(b) create it in O_EXCL mode, so you wont smash another's held lock
(b-1) It worked, OK
(b-2) open failed, try ...xyzzz
repeat until (b-1)
There are thousands of examples of how to do this with bash.
Paul Jackson wrote:
> Dave wrote:
>
>>mktemp is being used here to provide randomness in the filename,
>>not just a uniqueness.
>
>
> Ok - useful point.
>
> How about:
>
> t=${TMPDIR:-/usr/tmp}/gitdiff.$$.$RANDOM
>
>
>>all an attacker has to do is create 65535 symlinks in /usr/tmp
the point of the xyzzy seed is to make creating all possible files
in-feasable.
>
>
> And how about if I removed the tmp files at the top:
>
> t=${TMPDIR:-/usr/tmp}/gitdiff.$$.$RANDOM
> trap 'rm -fr $t.?; trap 0; exit 0' 0 1 2 3 15
> rm -fr $t.?
>
> ... rest of script ...
>
> How close does that come to providing the same level of safety, while
> remaining portable over a wider range of systems, and not requiring that
> a separate command be forked?
>
>
>>I'd suggest fixing your distributions ...
>
>
> It's not just my distro; it's the distros of all git users.
>
> If apps can avoid depending on inessential details of their
> environment, that's friendlier to all concerned.
>
> And actually my distro is fine - it's just that I am running an old
> version of it on one of my systems. Newer versions of the mktemp -t
> option.
>
--
mit freundlichen Gr��en, Brian.
Dr. Brian O'Mahoney
Mobile +41 (0)79 334 8035 Email: [EMAIL PROTECTED]
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