Gentoo Archives: gentoo-user

From: Alan McKinnon <alan.mckinnon@×××××.com>
To: gentoo-user@l.g.o
Subject: Re: [gentoo-user] Downgrading glibc prevented by emerge/portage...but why initiated?
Date: Tue, 12 Sep 2017 07:22:34
Message-Id: e19d6e86-8628-474d-cd05-09d4d038f52f@gmail.com
In Reply to: [gentoo-user] Downgrading glibc prevented by emerge/portage...but why initiated? by tuxic@posteo.de
1 On 12/09/2017 05:43, tuxic@××××××.de wrote:
2 > Hi,
3 >
4 > got a problem this morning:
5 >
6 >>>> Verifying ebuild manifests
7 >>>> Running pre-merge checks for sys-libs/glibc-2.24-r4
8 > * Sanity check to keep you from breaking your system:
9 > * Downgrading glibc is not supported and a sure way to destruction
10 > * ERROR: sys-libs/glibc-2.24-r4::gentoo failed (pretend phase):
11 > * aborting to save your system
12 > *
13 > * Call stack:
14 > * ebuild.sh, line 115: Called pkg_pretend
15 > * ebuild.sh, line 348: Called toolchain-glibc_pkg_pretend
16 > * toolchain-glibc.eclass, line 507: Called die
17 > * The specific snippet of code:
18 > * die "aborting to save your system"
19 > *
20 > * If you need support, post the output of `emerge --info '=sys-libs/glibc-2.24-r4::gentoo'`,
21 > * the complete build log and the output of `emerge -pqv '=sys-libs/glibc-2.24-r4::gentoo'`.
22 > * The complete build log is located at '/var/tmp/portage/sys-libs/glibc-2.24-r4/temp/build.log'.
23 > * The ebuild environment file is located at '/var/tmp/portage/sys-libs/glibc-2.24-r4/temp/die.env'.
24 > * Working directory: '/var/tmp/portage/sys-libs/glibc-2.24-r4/homedir'
25 > * S: '/var/tmp/portage/sys-libs/glibc-2.24-r4/work/glibc-2.24'
26 >>>> Running pre-merge checks for media-sound/pulseaudio-11.0
27 > * Determining the location of the kernel source code
28 > * Found kernel source directory:
29 > * /usr/src/linux
30 > * Found sources for kernel version:
31 > * 4.13.1-RT
32 > * Checking for suitable kernel configuration options...
33 > [ ok ]
34 > * A preallocated buffer-size of 2048 (kB) or higher is recommended for the HD-audio driver!
35 > * CONFIG_SND_HDA_PREALLOC_SIZE=64
36 >
37 > I would interpret this as:
38
39 Looks to me like you are assuming the glibc maintainer has more
40 knowledge of the future that he/she actually has.
41
42 >
43 > In the past emerge had updated glibc to a higher version as it want it
44 > to install now and prevented the latter becayse it would be downgrade,
45 > which in turn would render my box useless.
46
47 No, not useless. It's a safety check for just in case. And now you must
48 bypass the checks
49
50 >
51 > But why updateing to higher version in the first step
52
53 Because you had a valid ebuild in the tree that said to do it ?
54 >
55 ....or attempting
56 > to downgrade now?
57
58 Because now you don't have that valid ebuild anymore?
59
60
61 >
62 > And finally...ANy update is blocked for now it seems...how can I get
63 > out of this?
64
65 Why is glibc wanting to downgrade? What is your current version?
66
67 both of these versions are in the tree: (~)2.24-r4^s (~)2.25-r4^s
68 so there is at least 1 glibc higher than what portage wants to downgrade to.
69
70 You need to find out why 2.25-r4 is not being used. Usual tools, e.g.:
71
72 grep -r glibc /etc/portage
73 and any other methods you prefer
74
75 As a last resort if the ebuld maintainer screwed up, you can bypass the
76 safety check. Edit ${PORTDIR}/eclass/toolchain-glibc.eclass and comment
77 out the check in
78 toolchain-glibc_pkg_pretend()
79
80 This is unlikely to destroy the system. Cause a problem - maybe. Destroy
81 it? No. The wording of the safety check is hugely over-dramatic to
82 discourage people from downgrading willy-nilly without thinking
83
84 --
85 Alan McKinnon
86 alan.mckinnon@×××××.com

Replies

Subject Author
Re: [gentoo-user] Downgrading glibc prevented by emerge/portage...but why initiated? Franz Fellner <alpine.art.de@×××××.com>