[pacman-dev] [arch] Plans for switching to new package naming format (name-ver-rel -> name-ver-rel-arch)

[Andrew Fyfe]

Dan McGee wrote:
> On 6/13/07, Aaron Griffin <aaronmgriffin at gmail.com> wrote:
>> On 6/13/07, Johan Grahn <johan at cgeek.net> wrote:
>>> On Wed, 2007-06-13 at 22:43 +0100, Andrew Fyfe wrote:
>>>> Are there any plans (if so when) to switch the official repositories
>>>> over to the new package naming format?
>>>>
>>>> Current/Old: name-ver-rel.pkg.tar.gz
>>>> New: name-ver-rel-arch.pkg.tar.gz
>>> Why do you wanna do this? I'm just curios...
>>>
>>> Is it not better to just have separate repos because they are compiled
>>> differently and better to maintain.
>>>
>>> I'm not saying that is it a bad idea, I just wanna know how you think
>> No body "wants" to do it - it's already done, and part of pacman 3.0.
>> The rationalization is simple: the majority of the time you don't
>> touch real package files... it's pacman -S, done.  There is really
>> nothing lost from adding the suffix - what is gained is clarity in
>> looking at the filename.
>>
>> To respond to Andrew: there actually is no real "plan" at the
>> moment... but we want to make sure pacman2 users have sufficient time
>> to make the switch before we kill their packages.
> 
> This drifts into something that should be on the pacman ML, so I'm
> moving it there. Is there any reason for pacman to enforce a naming
> convention at all when it comes to the packages? We should do any
> information gathering from the .PKGINFO file in the package itself
> rather than the name, shouldn't we?
> 
> I also might be way off here- maybe pacman doesn't care. If so, let me
> know- I haven't dug into the code yet on this issue.
> 
> -Dan
> 
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This isn't so much a problem for pacman, but it's a problem for the 
support scripts. There are two methods to get a package name,

1) from .PKGINFO
   + guaranteed to get the correct name
   - can be very slow with big packages or when parsing a lot of packages.

This takes 4 seconds....
   tar -xOf kernel26-2.6.21.5-1.pkg.tar.gz .PKGINFO | \
   grep '^pkgname = ' | sed 's/^pkgname = //'

2) from the file name
   + fast
   - can be difficult to get the correct package name. Because pkgname 
can contain - it's difficult to parse the file name because we have two 
different naming schemes. Unless you hard code a check for {i686,x86_64} 
  there's no easy way (without reading .PKGINFO) to check if you've got 
the right name.


This takes 0.02 seconds...
   echo kernel26-2.6.21.5-1.pkg.tar.gz | \
   sed 's/.pkg.tar.gz$//;s/-[^-]*-[^-]*$//'
or for new format...
   echo kernel26-2.6.21.5-1-i686.pkg.tar.gz | \
   sed 's/.pkg.tar.gz$//;s/-[^-]*-[^-]*-[^-]*$//'

Andrew