CPAN 初始设置

在安装Koha的时候，需要提前安装perl的相关模块，这里用到了CPAN，刚开始不知道是什么东东，现把Google来的东西整理在此，以作备份。

CPAN简介
CPAN是Comprehensive Perl Archive Network的缩写，它是一个巨大的Perl软件收藏库，收集了大量有用的Perl模块(modules)及其相关的文件。

CPAN的初始化
当第一次使用CPAN时，需要进行初始化，初始化命令如下：
sudo /etc/perl/CPAN/Config.pm initialized

初始化的过程除了几个选项外，一般是一路回车默认至结束。

若想再次初始化，可以执行如下命令
sudo cpan
cpan> o conf init

初始化信息如下：

CPAN is the world-wide archive of perl resources. It consists of about
100 sites that all replicate the same contents all around the globe.
Many countries have at least one CPAN site already. The resources
found on CPAN are easily accessible with the CPAN.pm module. If you
want to use CPAN.pm, you have to configure it properly.

If you do not want to enter a dialog now, you can answer ‘no’ to this
question and I’ll try to autoconfigure. (Note: you can revisit this
dialog anytime later by typing ‘o conf init’ at the cpan prompt.)

Are you ready for manual configuration? [yes]

The following questions are intended to help you with the
configuration. The CPAN module needs a directory of its own to cache
important index files and maybe keep a temporary mirror of CPAN files.
This may be a site-wide directory or a personal directory.

First of all, I’d like to create this directory. Where?

CPAN build and cache directory? [/root/.cpan]

If you want, I can keep the source files after a build in the cpan
home directory. If you choose so then future builds will take the
files from there. If you don’t want to keep them, answer 0 to the
next question.

How big should the disk cache be for keeping the build directories
with all the intermediate files?

Cache size for build directory (in MB)? [10]

By default, each time the CPAN module is started, cache scanning
is performed to keep the cache size in sync. To prevent from this,
disable the cache scanning with ‘never’.

Perform cache scanning (atstart or never)? [atstart]

To considerably speed up the initial CPAN shell startup, it is
possible to use Storable to create a cache of metadata. If Storable
is not available, the normal index mechanism will be used.

Cache metadata (yes/no)? [yes]

The next option deals with the charset your terminal supports. In
general CPAN is English speaking territory, thus the charset does not
matter much, but some of the aliens out there who upload their
software to CPAN bear names that are outside the ASCII range. If your
terminal supports UTF-8, you say no to the next question, if it
supports ISO-8859-1 (also known as LATIN1) then you say yes, and if it
supports neither nor, your answer does not matter, you will not be
able to read the names of some authors anyway. If you answer no, names
will be output in UTF-8.

Your terminal expects ISO-8859-1 (yes/no)? [yes] no

If you have one of the readline packages (Term::ReadLine::Perl,
Term::ReadLine::Gnu, possibly others) installed, the interactive CPAN
shell will have history support. The next two questions deal with the
filename of the history file and with its size. If you do not want to
set this variable, please hit SPACE RETURN to the following question.

File to save your history? [/root/.cpan/histfile]
Number of lines to save? [100]

The CPAN module can detect when a module that which you are trying to
build depends on prerequisites. If this happens, it can build the
prerequisites for you automatically (’follow’), ask you for
confirmation (’ask’), or just ignore them (’ignore’). Please set your
policy to one of the three values.

Policy on building prerequisites (follow, ask or ignore)? [ask]

The CPAN module will need a few external programs to work properly.
Please correct me, if I guess the wrong path for a program. Don’t
panic if you do not have some of them, just press ENTER for those. To
disable the use of a download program, you can type a space followed
by ENTER.

Where is your gzip program? [/bin/gzip]
Where is your tar program? [/bin/tar]
Where is your unzip program? [/usr/bin/unzip]
Where is your make program? [/usr/bin/make]
Warning: lynx not found in PATH
Where is your lynx program? [] /usr/bin
Where is your wget program? [/usr/bin/wget]
Warning: ncftpget not found in PATH
Where is your ncftpget program? []
Warning: ncftp not found in PATH
Where is your ncftp program? []
Where is your ftp program? [/usr/bin/ftp]
Where is your gpg program? [/usr/bin/gpg]
What is your favorite pager program? [/usr/bin/less]
What is your favorite shell? [/bin/bash]

Every Makefile.PL is run by perl in a separate process. Likewise we
run ‘make’ and ‘make install’ in processes. If you have any
parameters (e.g. PREFIX, LIB, UNINST or the like) you want to pass
to the calls, please specify them here.

If you don’t understand this question, just press ENTER.

Parameters for the ‘perl Makefile.PL’ command?
Typical frequently used settings:

PREFIX=~/perl non-root users (please see manual for more hints)

Your choice: [INSTALLDIRS=site]
Parameters for the ‘make’ command?
Typical frequently used setting:

-j3 dual processor system

Your choice: [] -j3 ＃双核才需要填写
Parameters for the ‘make install’ command?
Typical frequently used setting:

UNINST=1 to always uninstall potentially conflicting files

Your choice: []

Sometimes you may wish to leave the processes run by CPAN alone
without caring about them. As sometimes the Makefile.PL contains
question you’re expected to answer, you can set a timer that will
kill a ‘perl Makefile.PL’ process after the specified time in seconds.

If you set this value to 0, these processes will wait forever. This is
the default and recommended setting.

Timeout for inactivity during Makefile.PL? [0]

If you’re accessing the net via proxies, you can specify them in the
CPAN configuration or via environment variables. The variable in
the $CPAN::Config takes precedence.

Your ftp_proxy?
Your http_proxy?
Your no_proxy?
You have no /root/.cpan/sources/MIRRORED.BY
I’m trying to fetch one
CPAN: LWP::UserAgent loaded ok
Fetching with LWP:
ftp://ftp.perl.org/pub/CPAN/MIRRORED.BY

Now we need to know where your favorite CPAN sites are located. Push
a few sites onto the array (just in case the first on the array won’t
work). If you are mirroring CPAN to your local workstation, specify a
file: URL.

First, pick a nearby continent and country (you can pick several of
each, separated by spaces, or none if you just want to keep your
existing selections). Then, you will be presented with a list of URLs
of CPAN mirrors in the countries you selected, along with previously
selected URLs. Select some of those URLs, or just keep the old list.
Finally, you will be prompted for any extra URLs — file:, ftp:, or
http: — that host a CPAN mirror.

(1) Africa
(2) Asia
(3) Central America
(4) Europe
(5) North America
(6) Oceania
(7) South America
Select your continent (or several nearby continents) [] 2
Sorry! since you don’t have any existing picks, you must make a
geographic selection.

(1) China
(2) Hong Kong
(3) Indonesia
(4) Israel
(5) Japan
(6) Korea
(7) Pakistan
(8) Philippines
(9) Republic of Korea
(10) Saudi Arabia
(11) Singapore
(12) Taiwan
(13) Thailand
(14) Turkey
Select your country (or several nearby countries) [] 1 2 5 12

(1) ftp://ftp.cuhk.edu.hk/pub/packages/perl/CPAN/ (Hong Kong)
(2) (Hong Kong)
(3) ftp://ftp.dti.ad.jp/pub/lang/CPAN/ (Japan)
(4) ftp://ftp.jaist.ac.jp/pub/CPAN/ (Japan)
(5) ftp://ftp.kddilabs.jp/CPAN/ (Japan)
(6) ftp://ftp.nara.wide.ad.jp/pub/CPAN/ (Japan)
(7) ftp://ftp.riken.jp/lang/CPAN/ (Japan)
(8) ftp://ftp.ring.gr.jp/pub/lang/perl/CPAN/ (Japan)
(9) ftp://ftp.u-aizu.ac.jp/pub/CPAN (Japan)
(10) ftp://ftp.yz.yamagata-u.ac.jp/pub/lang/cpan/ (Japan)
(11) ftp://cpan.cdpa.nsysu.edu.tw/Unix/Lang/CPAN/ (Taiwan)
(12) ftp://cpan.cs.pu.edu.tw/pub/CPAN (Taiwan)
(13) ftp://cpan.nctu.edu.tw/ (Taiwan)
(14) ftp://ftp.isu.edu.tw/pub/CPAN (Taiwan)
(15) ftp://ftp.ncu.edu.tw/CPAN/ (Taiwan)
(16) ftp://ftp.stu.edu.tw/CPAN (Taiwan)
2 more items, hit SPACE RETURN to show them
Select as many URLs as you like (by number),
put them on one line, separated by blanks, e.g. ‘1 4 5′
(or just hit RETURN to keep your previous picks) [18] 1 2 3 11 12 13 14 15 16

Enter another URL or RETURN to quit: []
New set of picks:
ftp://ftp.cuhk.edu.hk/pub/packages/perl/CPAN/

ftp://ftp.dti.ad.jp/pub/lang/CPAN/
ftp://cpan.cdpa.nsysu.edu.tw/Unix/Lang/CPAN/
ftp://cpan.cs.pu.edu.tw/pub/CPAN
ftp://cpan.nctu.edu.tw/
ftp://ftp.isu.edu.tw/pub/CPAN
ftp://ftp.ncu.edu.tw/CPAN/
ftp://ftp.stu.edu.tw/CPAN

commit: wrote /etc/perl/CPAN/Config.pm

cpan> quit
Terminal does not support GetHistory.
Lockfile removed.
root@ubuntu:

CPAN的使用方法
一、安装模块
例如需要安装CGI::Session模块，可以有如下两种方法：
1、直接法
sudo cpan CGI::Session
2、间接法
sudo cpan
cpan> install CGI::Session
cpan> quit

二、在CPAN中查询模块
sudo cpan
cpan> d /CGI::Session/
cpan> quit

下面是摘引自Fed Chu’s Blog的“用CPAN安装perl module”，供参考。

1. 首先配置CPAN Module，方法是在bash下面运行
$ perl -MCPAN -eshell
配置过程会询问一些问题，其中CPAN的镜像可以选择。
2. 接下来要更新CPAN Module，而不是直接装LWP。否则会遇到undefined subroutine &Digest::base::new之类的错误。方法是运行
cpan> install Bundle::CPAN
这一步是关键，切记切记。我开始不知道，还在网上搜索这个错误信息，发现有人说是Perl的问题，我就把整个Cygwin更新到1.5.19.4，结果啥用也没有，还把其它东西弄得一塌糊涂。
3. 装好新的CPAN Module，先退出，然后再运行1里面的命令进入CPAN的shell，这时就可以装LWP了
cpan> install Bundle::LWP
安装Bundle::LWP意味着不仅安装LWP，而且安装它需要的其它module。

下面转自程序人生的“Perl 下面用cpan安装相关的模块问题”

最近有玩一下Perl，想用一下cpan中的一些不错的模块，但安装的过程中老是提示make…. not ok，我的服务器环境是freebsd6.2 （升级过ports) 现在的perl 版本是perl 5.8.8

针对上面的错误我的做法是重装，经过反复的重装，最后终于OK，下面分享一下我的重装过程。

如我要安装HTML::TreeBuilder

第一步：检查一下HTML::TreeBuilder模块是否存在于系统中，运行下面的两个指令，

官方给出的方法:

#perl -MHTML::TreeBuilder -e 1

如果运行上面的命令未有警告的话说明该模块已经安装了，需要看相关的使用说明可以使用下面的命令

#perldoc HTML::TreeBuilder

第二种方法其它已经在上面有提到过，即用查看帮助的方法

#perldoc HTML::TreeBuilder

如果有帮助信息的，则说明已安装，否则未安装

第二步：删除CPAN的配置

#cd /usr/local/lib/perl5/5.8.8/CPAN

#rm -f Config.pm

第三步：重新安装 CPAN

#perl -MCPAN -e shell

运行上面的命令后系统会提示这是首次运行cpan，要做一些设置，一般不知道是什么意思时只需要一直按“回车”即可！

下面贴出我的CPAN配置文件

Config.pm:

[code]

# This is CPAN.pm’s systemwide configuration file. This file provides
# defaults for users, and the values can be changed in a per-user
# configuration file. The user-config file is being looked for as
# ~/.cpan/CPAN/MyConfig.pm.

$CPAN::Config = {
‘build_cache’ => q[10],
‘build_dir’ => q[/root/.cpan/build],
‘cache_metadata’ => q[1],
‘cpan_home’ => q[/root/.cpan],
‘dontload_hash’ => { },
‘ftp’ => q[/usr/bin/ftp],
‘ftp_proxy’ => q[],
‘getcwd’ => q[cwd],
‘gpg’ => q[],
‘gzip’ => q[/usr/bin/gzip],
‘histfile’ => q[/root/.cpan/histfile],
‘histsize’ => q[100],
‘http_proxy’ => q[],
‘inactivity_timeout’ => q[0],
‘index_expire’ => q[1],
‘inhibit_startup_message’ => q[0],
‘keep_source_where’ => q[/root/.cpan/sources],
‘lynx’ => q[],
‘make’ => q[/usr/bin/make],
‘make_arg’ => q[],
‘make_install_arg’ => q[],
‘makepl_arg’ => q[],
‘ncftp’ => q[],
‘ncftpget’ => q[],
‘no_proxy’ => q[],
‘pager’ => q[more],
‘prerequisites_policy’ => q[ask],
’scan_cache’ => q[atstart],
’shell’ => q[/bin/csh],
‘tar’ => q[/usr/bin/tar],
‘term_is_latin’ => q[1],
‘unzip’ => q[/usr/local/bin/unzip],
‘urllist’ => [q[ftp://cpan.hexten.net/], q[ftp://cpan.hostrack.net/pub/CPAN], q[ftp://cpan.pair.com/pub/CPAN/]],
‘wget’ => q[/usr/bin/wget],
};