# cogito: problems in read-only trees

3 messages from 2005-08-03 to 2005-08-04. Participants: Wolfgang Denk, Petr Baudis, Holger Eitzenberger.
Thread: https://gitlist.dev/t/1405

## Wolfgang Denk, 2005-08-03 07:42

Subject: cogito: problems in read-only trees
Message-ID: <20050803074241.A2D1D3535F9@atlas.denx.de>
URL: https://gitlist.dev/e/20050803074241.A2D1D3535F9%40atlas.denx.de

```
Hello,

sometimes I have to  work  in  trees  for  which  I  have  only  read
permissions; cogito has problems then - for example:

-> cg-diff 
fatal: unable to create new cachefile
fatal: unable to create temp-file

It would be nice if there was at least a way to specify  some  TMPDIR
instead of the current directory in such a situation.

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de
Include the success of others in your dreams for your own success.

```

## Petr Baudis, 2005-08-04 20:11

Subject: git: problems in read-only trees
Message-ID: <20050804201125.GB24479@pasky.ji.cz>
URL: https://gitlist.dev/e/20050804201125.GB24479%40pasky.ji.cz
In-Reply-To: <20050803074241.A2D1D3535F9@atlas.denx.de>

```
Dear diary, on Wed, Aug 03, 2005 at 09:42:41AM CEST, I got a letter
where Wolfgang Denk <wd@denx.de> told me that...
> Hello,
> 
> sometimes I have to  work  in  trees  for  which  I  have  only  read
> permissions; cogito has problems then - for example:
> 
> -> cg-diff 
> fatal: unable to create new cachefile
> fatal: unable to create temp-file
> 
> It would be nice if there was at least a way to specify  some  TMPDIR
> instead of the current directory in such a situation.

This is a bug in git-diff-* (producing the second error message; the first
error message means failed git-update-cache --refresh but that isn't
fatal). Any reason why prep_temp_blob() works in . instead of $TMPDIR?

-- 
				Petr "Pasky" Baudis
Stuff: http://pasky.or.cz/
If you want the holes in your knowledge showing up try teaching
someone.  -- Alan Cox

```

## Holger Eitzenberger, 2005-08-04 20:38

Subject: Re: git: problems in read-only trees
Message-ID: <42F27CCC.5050103@my-eitzenberger.de>
URL: https://gitlist.dev/e/42F27CCC.5050103%40my-eitzenberger.de
In-Reply-To: <20050804201125.GB24479@pasky.ji.cz>

```
Petr Baudis wrote:

>>-> cg-diff 
>>fatal: unable to create new cachefile
>>fatal: unable to create temp-file
>>
>>It would be nice if there was at least a way to specify  some  TMPDIR
>>instead of the current directory in such a situation.

> This is a bug in git-diff-* (producing the second error message; the first
> error message means failed git-update-cache --refresh but that isn't
> fatal). Any reason why prep_temp_blob() works in . instead of $TMPDIR?

I do not know about the first message (cachefile), but the 2nd one is 
trivial to fix.  I implemented a function called git_mkstemp() (path.c 
and so in libgit) which places the tmpfiles in $TMPDIR and if it's not 
set in /tmp.  The is close to what other programs do.

There are other references to mkstemp() in git where one or two of them 
may use git_mkstemp() instead, but not in sha1_file.c, since it 
hardlinks  it later on.

/holger

```