On 03/05/2010 11:26 AM, Duncan wrote: > Zac Medico posted on Fri, 05 Mar 2010 03:24:29 -0800 as excerpted: > >> On 03/05/2010 03:09 AM, Maciej Mrozowski wrote: >>> Now on more serious note, ideally python could be treated just like any >>> other non-leaf package (in dependency tree), just like library. In such >>> case it's completely reasonable to stabilize the newest version of such >>> 'library', especially when it's slotted and doesn't conflict in any way >>> with the rest. However, because of being used by package manager, >>> python is leaf application really and it's going to be immediately >>> pulled for everyone. >> >> It won't be pulled in by sys-apps/portage dependencies which look like >> this: >> >> || ( dev-lang/python:2.8 dev-lang/python:2.7 dev-lang/python:2.6 >>> =dev-lang/python-3 ) >> >> If you already have python:2.6 installed then it will not pull in a new >> slot. > > Won't emerge -aNuD pull it in anyway, even in a new slot, since portage > says it can use it? I know I use that, so I'm always updated all the way > thru the system, not just at the leaves.
No, it won't. To prove it, I've just tested with a stable stage3 containing portage-2.1.7.x. Here are the steps: 1) extract stable stage3 and chroot into it 2) mkdir /etc/portage && echo "dev-lang/python ~*" >> /etc/portage/package.keywords 3) Run `emerge -pu --deep=1 portage`: These are the packages that would be merged, in order: Calculating dependencies... done! [ebuild UD] sys-apps/sandbox-1.6-r2 [2.2] [ebuild UD] app-shells/bash-4.0_p35 [4.0_p37] [ebuild U ] dev-lang/python-2.6.4-r1 [2.6.4] If you try `emerge -puD world` then you will see dev-lang/python-3.1.1-r1 pulled in by the unspecific dev-lang/python atoms in the cracklib and libxml2 dependencies. However, in portage-2.1.7.x (current stable), there is support for pseudo-version-ranges in dependencies. This allows you use a dependency like <dev-lang/python-3 in a package that doesn't support python3, and that will prevent it from getting pulled into the dependency graph. -- Thanks, Zac
