Open Mac screenshot on Fedora

[Paul Howarth]

Hannes Mayer wrote:
> Paul Howarth wrote:
> 
>> I was going to raise a bug about the missing picttoppm binary in the
>> netpbm-progs package but when I looked at the spec file and the patches
>> for netpbm, I discovered that picttoppm was deliberately removed,
>> apparently for security reasons. The patch netpbm-10.23-security.patch
>> removes picttoppm from the list of programs to build in the Makefile,
>> and adds the following line to the start of the picttoppm code:
>>
>> #error "Unfixable. Don't ship me"
>>
>> So instead I have raised a bug about the package containing a manpage
>> for a program that is not shipped:
>>
>> https://bugzilla.redhat.com/beta/show_bug.cgi?id=146863
> 
> 
> Thanks Paul!
> 
> The usage of picttoppm is a bit uncommon
> # picttoppm file.pict > file.ppm
> but I don't think this is what the folks at redhat meant.

No, this is the normal way of using the netpbm tools. You use a program 
to convert whatever input file format you have (e.g. pict) into 
something portable (e.g. ppm) and then pipe the output into a converter 
that converts the portable format into whatever output format you want 
(e.g. gif):

$ picttoppm file.pict | ppmtogif > file.gif

There are also a bunch of filters you can apply in the middle of the 
pipeline to change the image in various ways, thus providing a powerful 
set of command-line tools for manipulating images of various formats. 
See the netpbm documentation for further details.

I suspect the security issue with picttoppm was probably to do with 
insecure temporary files but I'm not sure about that. You may want to 
consider disabling the program (chmod 0 `which picttoppm`) if you have 
security concerns about it.

> I'll look at the bugzilla entry every now and then.

Good idea.

Paul.