cpan::firsttime.3

视频监控网络部分的协议ddns,的模块的实现代码,请大家大胆指正.

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.\" ========================================================================
.\"
.IX Title "CPAN::FirstTime 3"
.TH CPAN::FirstTime 3 "2007-12-18" "perl v5.10.0" "Perl Programmers Reference Guide"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.SH "NAME"
CPAN::FirstTime \- Utility for CPAN::Config file Initialization
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
\&\fICPAN::FirstTime::init()\fR
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The init routine asks a few questions and writes a CPAN/Config.pm or
CPAN/MyConfig.pm file (depending on what it is currently using).
.PP
In the following all questions and explanations regarding config
variables are collected.
.IP "auto_commit" 2
.IX Item "auto_commit"
Normally \s-1CPAN\s0.pm keeps config variables in memory and changes need to
be saved in a separate 'o conf commit' command to make them permanent
between sessions. If you set the 'auto_commit' option to true, changes
to a config variable are always automatically committed to disk.
.Sp
Always commit changes to config variables to disk?
.IP "build_cache" 2
.IX Item "build_cache"
\&\s-1CPAN\s0.pm can limit the size of the disk area for keeping the build
directories with all the intermediate files.
.Sp
Cache size for build directory (in \s-1MB\s0)?
.IP "build_dir" 2
.IX Item "build_dir"
Directory where the build process takes place?
.IP "build_dir_reuse" 2
.IX Item "build_dir_reuse"
Until version 1.88 \s-1CPAN\s0.pm never trusted the contents of the build_dir
directory between sessions. Since 1.88_58 \s-1CPAN\s0.pm has a YAML-based
mechanism that makes it possible to share the contents of the
build_dir/ directory between different sessions with the same version
of perl. People who prefer to test things several days before
installing will like this feature because it safes a lot of time.
.Sp
If you say yes to the following question, \s-1CPAN\s0 will try to store
enough information about the build process so that it can pick up in
future sessions at the same state of affairs as it left a previous
session.
.Sp
Store and re-use state information about distributions between
\&\s-1CPAN\s0.pm sessions?
.IP "build_requires_install_policy" 2
.IX Item "build_requires_install_policy"
When a module declares another one as a 'build_requires' prerequisite
this means that the other module is only needed for building or
testing the module but need not be installed permanently. In this case
you may wish to install that other module nonetheless or just keep it
in the 'build_dir' directory to have it available only temporarily.
Installing saves time on future installations but makes the perl
installation bigger.
.Sp
You can choose if you want to always install (yes), never install (no)
or be always asked. In the latter case you can set the default answer
for the question to yes (ask/yes) or no (ask/no).
.Sp
Policy on installing 'build_requires' modules (yes, no, ask/yes,
ask/no)?
.IP "cache_metadata" 2
.IX Item "cache_metadata"
To considerably speed up the initial \s-1CPAN\s0 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.
.Sp
Note: this mechanism is not used when use_sqlite is on and SQLLite is
running.
.Sp
Cache metadata (yes/no)?
.IP "check_sigs" 2
.IX Item "check_sigs"
\&\s-1CPAN\s0 packages can be digitally signed by authors and thus verified
with the security provided by strong cryptography. The exact mechanism
is defined in the Module::Signature module. While this is generally
considered a good thing, it is not always convenient to the end user
to install modules that are signed incorrectly or where the key of the
author is not available or where some prerequisite for
Module::Signature has a bug and so on.
.Sp
With the check_sigs parameter you can turn signature checking on and
off. The default is off for now because the whole tool chain for the
functionality is not yet considered mature by some. The author of
\&\s-1CPAN\s0.pm would recommend setting it to true most of the time and
turning it off only if it turns out to be annoying.
.Sp
Note that if you do not have Module::Signature installed, no signature
checks will be performed at all.
.Sp
Always try to check and verify signatures if a \s-1SIGNATURE\s0 file is in
the package and Module::Signature is installed (yes/no)?
.IP "colorize_output" 2
.IX Item "colorize_output"
When you have Term::ANSIColor installed, you can turn on colorized
output to have some visual differences between normal \s-1CPAN\s0.pm output,
warnings, debugging output, and the output of the modules being
installed. Set your favorite colors after some experimenting with the
Term::ANSIColor module.
.Sp
Do you want to turn on colored output?
.IP "colorize_print" 2
.IX Item "colorize_print"
Color for normal output?
.IP "colorize_warn" 2
.IX Item "colorize_warn"
Color for warnings?
.IP "colorize_debug" 2
.IX Item "colorize_debug"
Color for debugging messages?
.IP "commandnumber_in_prompt" 2
.IX Item "commandnumber_in_prompt"
The prompt of the cpan shell can contain the current command number
for easier tracking of the session or be a plain string.
.Sp
Do you want the command number in the prompt (yes/no)?
.IP "ftp_passive" 2
.IX Item "ftp_passive"
Shall we always set the \s-1FTP_PASSIVE\s0 environment variable when dealing
with ftp download (yes/no)?
.IP "getcwd" 2
.IX Item "getcwd"
\&\s-1CPAN\s0.pm changes the current working directory often and needs to
determine its own current working directory. Per default it uses
Cwd::cwd but if this doesn't work on your system for some reason,
alternatives can be configured according to the following table:
.Sp
.Vb 4
\&    cwd         Cwd::cwd
\&    getcwd      Cwd::getcwd
\&    fastcwd     Cwd::fastcwd
\&    backtickcwd external command cwd
.Ve
.Sp
Preferred method for determining the current working directory?
.IP "histfile" 2
.IX Item "histfile"
If you have one of the readline packages (Term::ReadLine::Perl,
Term::ReadLine::Gnu, possibly others) installed, the interactive \s-1CPAN\s0
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 \s-1SPACE\s0 \s-1RETURN\s0 to the following question.
.Sp
File to save your history?
.IP "histsize" 2
.IX Item "histsize"
Number of lines to save?
.IP "inactivity_timeout" 2
.IX Item "inactivity_timeout"
Sometimes you may wish to leave the processes run by \s-1CPAN\s0 alone
without caring about them. Because the Makefile.PL or the Build.PL
sometimes 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.