[wp-trac] Re: [WordPress Trac] #5560: Automatic Upgrade

[WordPress Trac]

#5560: Automatic Upgrade
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 Reporter:  keithdsouza  |        Owner:  ryan  
     Type:  enhancement  |       Status:  closed
 Priority:  normal       |    Milestone:  2.7   
Component:  General      |      Version:  2.5   
 Severity:  normal       |   Resolution:  fixed 
 Keywords:  blessed      |  
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Comment (by ryan):

 Steps performed during upgrade.

  * Send version and locale to http://api.wordpress.org/core/version-
 check/1.2/ to see if there is an update available.  Get a link to the WP
 package if so.  The package for the requested locale is used if available,
 otherwise the English package is used.  Only locales that have setup an
 international site on wp.org will have packages available. Reference
 http://api.wordpress.org/core/version-check/1.2/

  * Download the package from wordpress.org to the system temp directory

  * Create working dir, usually wp-content/upgrade/core

  * Unzip the package into our working dir

  * Copy wp-admin/includes/update-core.php from the new version unzipped in
 the working dir into the current WP install

  * Include the new update-core.php

  * Call update_core(), which is defined in update-core.php

 update_core() takes over and does the following:

  * Sanity check the new version of WP sitting in the working dir

  * Create a .maintenance file in the WP root dir.  wp-settings.php checks
 this and prevents WP from fully loading if it exists.  We don't want WP
 loading while files are being upgraded.

  * Overwrite old WP files with the new ones

  * Remove files that are no longer part of the WP distro

  * Send a request to ugrade.php to perform a DB upgrade.  We do this as a
 separate request instead of calling the upgrade function directly because
 we need a fresh request that has all of the new stuff loaded.

  * Delete the working dir

  * Delete .maintenance

  * Done

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Ticket URL: <http://trac.wordpress.org/ticket/5560#comment:60>
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