NAME

       ExtUtils::Install - install files from here to there

SYNOPSIS

         use ExtUtils::Install;

         install({ 'blib/lib' => 'some/install/dir' } );

         uninstall($packlist);

         pm_to_blib({ 'lib/Foo/Bar.pm' => 'blib/lib/Foo/Bar.pm' });

VERSION

       2.04

DESCRIPTION

       Handles the installing and uninstalling of perl modules, scripts, man pages, etc...

       Both install() and uninstall() are specific to the way ExtUtils::MakeMaker handles the
       installation and deinstallation of perl modules. They are not designed as general purpose
       tools.

       On some operating systems such as Win32 installation may not be possible until after a
       reboot has occurred. This can have varying consequences: removing an old DLL does not
       impact programs using the new one, but if a new DLL cannot be installed properly until
       reboot then anything depending on it must wait. The package variable

         $ExtUtils::Install::MUST_REBOOT

       is used to store this status.

       If this variable is true then such an operation has occurred and anything depending on
       this module cannot proceed until a reboot has occurred.

       If this value is defined but false then such an operation has ocurred, but should not
       impact later operations.

   Functions
       install
               # deprecated forms
               install(\%from_to);
               install(\%from_to, $verbose, $dry_run, $uninstall_shadows,
                           $skip, $always_copy, \%result);

               # recommended form as of 1.47
               install([
                   from_to => \%from_to,
                   verbose => 1,
                   dry_run => 0,
                   uninstall_shadows => 1,
                   skip => undef,
                   always_copy => 1,
                   result => \%install_results,
               ]);

           Copies each directory tree of %from_to to its corresponding value preserving
           timestamps and permissions.

           There are two keys with a special meaning in the hash: "read" and "write".  These
           contain packlist files.  After the copying is done, install() will write the list of
           target files to $from_to{write}. If $from_to{read} is given the contents of this file
           will be merged into the written file. The read and the written file may be identical,
           but on AFS it is quite likely that people are installing to a different directory than
           the one where the files later appear.

           If $verbose is true, will print out each file removed.  Default is false.  This is
           "make install VERBINST=1". $verbose values going up to 5 show increasingly more
           diagnostics output.

           If $dry_run is true it will only print what it was going to do without actually doing
           it.  Default is false.

           If $uninstall_shadows is true any differing versions throughout @INC will be
           uninstalled.  This is "make install UNINST=1"

           As of 1.37_02 install() supports the use of a list of patterns to filter out files
           that shouldn't be installed. If $skip is omitted or undefined then install will try to
           read the list from INSTALL.SKIP in the CWD. This file is a list of regular expressions
           and is just like the MANIFEST.SKIP file used by ExtUtils::Manifest.

           A default site INSTALL.SKIP may be provided by setting then environment variable
           EU_INSTALL_SITE_SKIPFILE, this will only be used when there isn't a distribution
           specific INSTALL.SKIP. If the environment variable EU_INSTALL_IGNORE_SKIP is true then
           no install file filtering will be performed.

           If $skip is undefined then the skip file will be autodetected and used if it is found.
           If $skip is a reference to an array then it is assumed the array contains the list of
           patterns, if $skip is a true non reference it is assumed to be the filename holding
           the list of patterns, any other value of $skip is taken to mean that no install
           filtering should occur.

           Changes As of Version 1.47

           As of version 1.47 the following additions were made to the install interface.  Note
           that the new argument style and use of the %result hash is recommended.

           The $always_copy parameter which when true causes files to be updated regardless as to
           whether they have changed, if it is defined but false then copies are made only if the
           files have changed, if it is undefined then the value of the environment variable
           EU_INSTALL_ALWAYS_COPY is used as default.

           The %result hash will be populated with the various keys/subhashes reflecting the
           install. Currently these keys and their structure are:

               install             => { $target    => $source },
               install_fail        => { $target    => $source },
               install_unchanged   => { $target    => $source },

               install_filtered    => { $source    => $pattern },

               uninstall           => { $uninstalled => $source },
               uninstall_fail      => { $uninstalled => $source },

           where $source is the filespec of the file being installed. $target is where it is
           being installed to, and $uninstalled is any shadow file that is in @INC or
           $ENV{PERL5LIB} or other standard locations, and $pattern is the pattern that caused a
           source file to be skipped. In future more keys will be added, such as to show created
           directories, however this requires changes in other modules and must therefore wait.

           These keys will be populated before any exceptions are thrown should there be an
           error.

           Note that all updates of the %result are additive, the hash will not be cleared before
           use, thus allowing status results of many installs to be easily aggregated.

           NEW ARGUMENT STYLE

           If there is only one argument and it is a reference to an array then the array is
           assumed to contain a list of key-value pairs specifying the options. In this case the
           option "from_to" is mandatory. This style means that you do not have to supply a
           cryptic list of arguments and can use a self documenting argument list that is easier
           to understand.

           This is now the recommended interface to install().

           RETURN

           If all actions were successful install will return a hashref of the results as
           described above for the $result parameter. If any action is a failure then install
           will die, therefore it is recommended to pass in the $result parameter instead of
           using the return value. If the result parameter is provided then the returned hashref
           will be the passed in hashref.

       install_default DISCOURAGED
               install_default();
               install_default($fullext);

           Calls install() with arguments to copy a module from blib/ to the default site
           installation location.

           $fullext is the name of the module converted to a directory (ie. Foo::Bar would be
           Foo/Bar).  If $fullext is not specified, it will attempt to read it from @ARGV.

           This is primarily useful for install scripts.

           NOTE This function is not really useful because of the hard-coded install location
           with no way to control site vs core vs vendor directories and the strange way in which
           the module name is given.  Consider its use discouraged.

       uninstall
               uninstall($packlist_file);
               uninstall($packlist_file, $verbose, $dont_execute);

           Removes the files listed in a $packlist_file.

           If $verbose is true, will print out each file removed.  Default is false.

           If $dont_execute is true it will only print what it was going to do without actually
           doing it.  Default is false.

       pm_to_blib
               pm_to_blib(\%from_to, $autosplit_dir);
               pm_to_blib(\%from_to, $autosplit_dir, $filter_cmd);

           Copies each key of %from_to to its corresponding value efficiently.  Filenames with
           the extension .pm are autosplit into the $autosplit_dir.  Any destination directories
           are created.

           $filter_cmd is an optional shell command to run each .pm file through prior to
           splitting and copying.  Input is the contents of the module, output the new module
           contents.

           You can have an environment variable PERL_INSTALL_ROOT set which will be prepended as
           a directory to each installed file (and directory).

           By default verbose output is generated, setting the PERL_INSTALL_QUIET environment
           variable will silence this output.

ENVIRONMENT

       PERL_INSTALL_ROOT
           Will be prepended to each install path.

       EU_INSTALL_IGNORE_SKIP
           Will prevent the automatic use of INSTALL.SKIP as the install skip file.

       EU_INSTALL_SITE_SKIPFILE
           If there is no INSTALL.SKIP file in the make directory then this value can be used to
           provide a default.

       EU_INSTALL_ALWAYS_COPY
           If this environment variable is true then normal install processes will always
           overwrite older identical files during the install process.

           Note that the alias EU_ALWAYS_COPY will be supported if EU_INSTALL_ALWAYS_COPY is not
           defined until at least the 1.50 release. Please ensure you use the correct
           EU_INSTALL_ALWAYS_COPY.

AUTHOR

       Original author lost in the mists of time.  Probably the same as Makemaker.

       Production release currently maintained by demerphq "yves at cpan.org", extensive changes
       by Michael G. Schwern.

       Send bug reports via http://rt.cpan.org/.  Please send your generated Makefile along with
       your report.

LICENSE

       This program is free software; you can redistribute it and/or modify it under the same
       terms as Perl itself.

       See <http://www.perl.com/perl/misc/Artistic.html>