GNU bug report logs - #15425
mktemp - conflicting options affected by ENV

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Message #19 received at 15425 <at> debbugs.gnu.org (full text, mbox):

From: Pádraig Brady <P <at> draigBrady.com>
To: 15425 <at> debbugs.gnu.org, assafgordon <at> gmail.com, 
 Eric Blake <eblake <at> redhat.com>
Subject: Re: bug#15425: mktemp - conflicting options affected by ENV
Date: Wed, 25 Sep 2013 10:32:32 +0100

On 09/21/2013 03:44 AM, Pádraig Brady wrote:
> On 09/21/2013 01:40 AM, Pádraig Brady wrote:
>> On 09/21/2013 01:14 AM, Pádraig Brady wrote:
>>> On 09/20/2013 05:50 PM, Assaf Gordon wrote:
>>>> Hello,
>>>>
>>>> Not sure if this is a bug or just unintended side-effect, but it caused some scripts here to fail and took a while to troubleshoot:
>>>> It basically boils down to the interplay between the deprecated "-t" "-p" and "$TMPDIR" and "--tmpdir".
>>>>
>>>> ===
>>>> ##
>>>> ## Problem 1: "-t" and TMPDIR (if non-empty) overrides "--tmpdir"
>>>> ##
>>>> $ TMPDIR= mktemp -u --tmpdir=. -t XXXXXX
>>>> ./og9G5s
>>>> $ TMPDIR=/foo/ mktemp -u --tmpdir=. -t XXXXXX
>>>> /foo/AAWcOl
>>>
>>> Yes this is confusing, and _not_ order dependent:
>>>
>>> $ TMPDIR=/foo/ mktemp -t -u --tmpdir=. XXXXXX
>>> /foo/AAWcOl
>>>
>>>>
>>>> ##
>>>> ## Problem 2: if TMPDIR is empty, "--tmpdir" overrides "-p", despite having "-t"
>>>> ##
>>>> $ TMPDIR=/foo/ mktemp -u -p /bar/ --tmpdir=. -t XXXXXX
>>>> /foo/tHXcrq
>>>> $ TMPDIR= mktemp -u -p /bar/ --tmpdir=. -t XXXXXX
>>>> ./OfWXSS
>>>> ## I'd expect the above to use "/bar/OfWXSS", to be consistent with TMPDIR overriding "--tmpdir".
>>>> ===
>>>
>>> Also confusing, and order dependent too:
>>>
>>> $ mktemp -p /aaa -u --tmpdir=. asdf/XXXX
>>> ./asdf/wdIT
>>> $ mktemp -u --tmpdir=. -p /aaa asdf/XXXX
>>> /aaa/asdf/3Jc7
>>>
>>>> I realize "-t" and "-p" are deprecated, and it's best not to meddle with them -
>>>> but for consistency, perhaps consider having the new "--tmpdir" always take precedence over "-t" and "-p" ?
>>>> or print a warning to STDERR when "-t" and "--tmpdir" are mixed?
>>>
>>> Yes I agree that --tmpdir should override -pt no matter what the order.
>>> In fact there is no reason to use -pt with --tmpdir and since the former
>>> are deprecated, I suggest we just disallow that combination with an error.
>>>
>>> Patch coming up.
>>
>> I also see the --help says that -p implies -t
>> AFAICS -t in the context of -p just means to interpret template as a single file without dirs,
>> however the example below shows that -t is not in fact implied with -p
>>
>> $ mktemp -u -p dir1 dir2/XXXXXX
>> dir1/dir2/qQBdsf
>> $ mktemp -u -t -p dir1 dir2/XXXXXX
>> src/mktemp: invalid template, ‘dir2/XXXXXX’, contains directory separator
>>
>> So rather than adjusting any functionality of these deprecated options,
>> I'll just remove the --help text saying that -t is implied.
> 
> Which would make -p = --tmpdir, which is what the code has done
> since being introduced to coreutils 6 years ago, and what the
> texinfo has documented for the last 4 years.  So I've just aligned
> the --help to say -p is the short form of --tmpdir.
> 
> Hopefully the attached addresses all these issues.

I'll push this soon, unless there are objections
to the above "undeprecation" of -p.

thanks,
Pádraig.

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