talloc-2.0.5 安装失败

[Peng Liang]

 emerge -pv talloc

These are the packages that would be merged, in order:

Calculating dependencies... done!
[ebuild     U ] sys-libs/talloc-2.0.5 [2.0.1-r1] USE="python%* -compat (-doc%) (-static-libs%) (-swig%)" 357 kB
[blocks B     ] <sys-libs/talloc-2.0.5 ("<sys-libs/talloc-2.0.5" is blocking sys-libs/talloc-2.0.5)

Total: 1 package (1 upgrade), Size of downloads: 357 kB
Conflict: 1 block (1 unsatisfied)

 * Error: The above package list contains packages which cannot be
 * installed at the same time on the same system.

  (sys-libs/talloc-2.0.5, ebuild scheduled for merge) pulled in by
    talloc

我看了下ebuild中有一句:

RDEPEND="!!<sys-libs/talloc-2.0.5"

我在overlay 里改成 RDEPEND="!<sys-libs/talloc-2.0.5" 就可以了
 
是维护人员多写了个！，还是怎么回事？


--
Peng Liang

[yegle]

lol~双重否定~

发自我的挨凤

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[Dennis.Yxun]

You've already installed 2.0.1-r1, un-merge it, then do emerge again.

2011/3/25 Peng Liang <pengli...@gmail.com>

[Dennis.Yxun]

HI Peng:
   既然你是在group上提问题，那最好也要回复group
恩，要养成好习惯
我查了PMS，有这个特性的
  实际上，这不是一个bug，而是一个feature ^_^

下面是zmedico(portage maintainer)的回复

<Openfree`> could someone explain me what does !! means, example "!!<sys-apps/sandbox-1.6" in subversion-1.6.16.ebuild DEPEND
<Openfree`> ==sys-apps/sandbox-1.6?
<dol-sen> usually the "!" symbol means a NOT
<zmedico> Openfree`: it's called a "hard blocker"
<dol-sen> not sure the dble !!
* Polynomial-C has quit (Ping timeout: 276 seconds)
<zmedico> it means the blocked package can't be temporarily installed at the same time
<zmedico> soft blockers allow temporary overlap
<zmedico> hard blockers don't
<zmedico> soft blockers are especially useful when updating a critical lib that you can't temporarily be without since that would break your tools
<zmedico> hard blockers are usually a workaround for build systems that are sensitive to installed files
<Openfree`> zmedico, got it, thanks

2011/3/25 Peng Liang <pengli...@gmail.com>

2011/3/25 Dennis.Yxun <denni...@gmail.com>

You've already installed 2.0.1-r1, un-merge it, then do emerge again.

You mean that it don't support updating from an old version, even from 2.0.1-r1 to 2.0.5 ?

--
Peng Liang

[Peng Liang]

2011/3/25 Dennis.Yxun <denni...@gmail.com>

HI Peng:
   既然你是在group上提问题，那最好也要回复group
恩，要养成好习惯
我查了PMS，有这个特性的
  实际上，这不是一个bug，而是一个feature ^_^

下面是zmedico(portage maintainer)的回复

<Openfree`> could someone explain me what does !! means, example "!!<sys-apps/sandbox-1.6" in subversion-1.6.16.ebuild DEPEND
<Openfree`> ==sys-apps/sandbox-1.6?
<dol-sen> usually the "!" symbol means a NOT
<zmedico> Openfree`: it's called a "hard blocker"
<dol-sen> not sure the dble !!
* Polynomial-C has quit (Ping timeout: 276 seconds)
<zmedico> it means the blocked package can't be temporarily installed at the same time
<zmedico> soft blockers allow temporary overlap
<zmedico> hard blockers don't
<zmedico> soft blockers are especially useful when updating a critical lib that you can't temporarily be without since that would break your tools
<zmedico> hard blockers are usually a workaround for build systems that are sensitive to installed files
<Openfree`> zmedico, got it, thanks

意思只能卸载再重装？

============
恩， 我是想回复到group的... 直接点的reply, 怎么默认不是group地址呢... 奇怪

--
Peng Liang

[Dennis.Yxun]

首先，不管是！还是！！，两个包，talloc-2.0.5和他低版本的都不能共存
如果在emerge world时，同时有不同的软件包把这两个不同版本都拉进来
emerge 会报错

！的话，soft blocker，就是两者不共存就可以了，比如你刚才改的样子
把talloc-2.0.5的！！改成！，那么，下面两种方式都不会报错，
a） 从2.0.5降级到以下的版本
b） 或从2.0.1-r1以及更低的版本升级到2.0.5

如果是！！，hard blocker，那么，执行上面的a）b）时，系统都会报错

[ebuild     U  ] sys-libs/talloc-2.0.5 [2.0.1-r1] USE="python%*"

[blocks B      ] <sys-libs/talloc-2.0.5 ("<sys-libs/talloc-2.0.5" is blocking sys-libs/talloc-2.0.5)

2011/3/25 Peng Liang <pengli...@gmail.com>

--
Peng Liang

[Dennis.Yxun]

2011/3/25 Peng Liang <pengli...@gmail.com>

回答你的问题，确实需要这样！
 

============
恩， 我是想回复到group的... 直接点的reply, 怎么默认不是group地址呢... 奇怪

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Peng Liang