Gentoo Archives: gentoo-dev

From: Zac Medico <zmedico@g.o>
To: gentoo-dev@l.g.o
Subject: Re: [gentoo-dev] perl eclass review - EAPI=3 + new helper eclass
Date: Tue, 06 Apr 2010 18:39:20
Message-Id: 4BBB7FDE.7090306@gentoo.org
In Reply to: Re: [gentoo-dev] perl eclass review - EAPI=3 + new helper eclass by James Cloos
1 On 04/06/2010 07:22 AM, James Cloos wrote:
2 >>>>>> "ZM" == Zac Medico <zmedico@g.o> writes:
3 >
4 > ZM> You can configure eclass override behavior via eclass-overrides in
5 > ZM> /etc/portage/repos.conf, as documented in `man portage`.
6 >
7 > ,----< From that manpage >
8 > | When using eclass-overrides, due to bug #276264, you must ensure that
9 > | your portage tree does not contain a metadata/cache/ directory.
10 > `----
11 >
12 > Which translates into "eclass-orderrides are completely and entirely
13 > useless, so don't bother.
14
15 Well, it's roughly equivalent to the old default behavior (which you
16 apparently preferred). However, the issue is now complicated by the
17 fact that FEATURES=metadata-transfer is disabled by default, so when
18 portage goes to pull cache directly from metadata/cache/, it won't
19 be able to validate eclass changes since there are no eclass
20 timestamps saved inside metadata/cache/. FWIW, there was some
21 discussion about extending the cache format to improve
22 the validation mechanism for eclasses here:
23
24 http://archives.gentoo.org/gentoo-dev/msg_cfa80e33ee5fa6f854120ddfb9b468b3.xml
25
26 > Portage used to used to search for eclasses starting in the top overlay;
27 > it should not have changed.
28
29 Well, the biggest caveat to that behavior is that it tends to
30 invalidate metadata cache as reported in this bug:
31
32 http://bugs.gentoo.org/show_bug.cgi?id=124041
33
34 I'd be happy to work on resolving issues with eclass-orderrides to
35 make it more usable. However, due to the need to regenerate metadata
36 cache, I don't think that this is something that can ever again be
37 enabled by default.
38 --
39 Thanks,
40 Zac

Replies

Subject Author
Re: [gentoo-dev] perl eclass review - EAPI=3 + new helper eclass James Cloos <cloos@×××××××.com>