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| Installer (Mac OS X) ： ウィキペディア英語版 |
Installer (OS X)
Installer is an application included in OS X (and in its progenitors OPENSTEP and NeXTSTEP) that extracts and installs files out of .pkg packages. It was created by NeXT, and is now maintained by Apple Inc. Its purpose is to help software developers create uniform software installers.
Installer resides at /Applications/Utilities/Installer.app on Macintosh computers running OS X versions prior to 10.5, and launches when a package or metapackage file is opened. In OS X Yosemite, the Installer application is located at /System/Library/CoreServices/Installer.app. The installation process itself can vary substantially, as Installer allows developers to customize the information the user is presented with. For example, it can be made to display a custom welcome message, software license and readme. Installer also handles authentication, checks that packages are valid before installing them, and allows developers to run custom scripts at several points during the installation process.〔 (Package maker user guide )〕
There is also a command line version located at /usr/sbin/installer.〔(Command line installer man page )〕
== Installer package ==
Installer packages have the file extension . Prior to OS X 10.5, installer packages were implemented as OS X packages.〔(【引用サイトリンク】title=Software Delivery Guide )〕 These packages were a collection of files that resided in folders with a .pkg file extension.〔(【引用サイトリンク】title=The Flat Package )〕〔(【引用サイトリンク】title=OSX legacy packaging redux )〕 In OS X 10.5 the software packaging method was changed to use the XAR (eXtensible ARchiver) file format; the directory tree containing the files is packaged as an xar archive file with a extension.〔(【引用サイトリンク】title=XAR NEW MacOS X 10.5 package format )〕 Instead of distributing multiple files for a package, this allowed all of the software files to be contained in a single file for easier distribution with the benefit of package signing.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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