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Sergey Biryukov dcca93232b Upgrade/Install: Create a temporary backup of plugins and themes before updating.
This aims to make the update process more reliable and ensures that if a plugin or theme update fails, the previous version can be safely restored.

* When updating a plugin or theme, the old version is moved to a temporary backup directory:
 * `wp-content/upgrade/temp-backup/plugins/[plugin-slug]` for plugins
 * `wp-content/upgrade/temp-backup/themes/[theme-slug]` for themes.

* If the update fails, then the temporary backup kept in the `upgrade/temp-backup` directory is restored to its original location.
* If the update succeeds, the temporary backup is deleted.

To further help troubleshoot plugin and theme updates, two new checks were added to the Site Health screen:
* A check to make sure that the `temp-backup` directory is writable.
* A check that there is enough disk space available to safely perform updates.

To avoid confusion: The `temp-backup` directory will NOT be used to "roll back" a plugin to a previous version after a completed update. This directory will simply contain a transient backup of the previous version of a plugin or theme being updated, and as soon as the update process finishes, the directory will be empty.

Props aristath, afragen, pbiron, dd32, poena, TimothyBlynJacobs, audrasjb, mikeschroder, a2hosting, hellofromTonya, KZeni, galbaras, richards1052, Boniu91, mai21, francina, SergeyBiryukov.
See #51857.
Built from https://develop.svn.wordpress.org/trunk@51815


git-svn-id: http://core.svn.wordpress.org/trunk@51422 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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wp-admin Upgrade/Install: Create a temporary backup of plugins and themes before updating. 2021-09-15 18:41:00 +00:00
wp-content Twenty Seventeen: Make blog header margin more specific on front page. 2021-09-14 10:19:01 +00:00
wp-includes Upgrade/Install: Create a temporary backup of plugins and themes before updating. 2021-09-15 18:41:00 +00:00
index.php Code Modernization: Replace `dirname( __FILE__ )` calls with `__DIR__` magic constant. 2020-02-06 06:33:11 +00:00
license.txt Happy New Year! 2021-01-01 00:19:07 +00:00
readme.html Update the IRC link from Freenode to Libera.chat. 2021-07-05 19:31:59 +00:00
wp-activate.php Robots: Introduce Robots API. 2021-01-21 01:37:00 +00:00
wp-blog-header.php Code Modernization: Replace `dirname( __FILE__ )` calls with `__DIR__` magic constant. 2020-02-06 06:33:11 +00:00
wp-comments-post.php Comments: Revert the introduction of the opt-in comment approval notification feature. 2021-02-17 13:08:05 +00:00
wp-config-sample.php Boostrap/Load: Further update the language in `wp-config-sample.php`. 2021-05-21 10:40:56 +00:00
wp-cron.php Build/Test Tools: Revert changes only included for testing purposes. 2021-08-03 15:15:57 +00:00
wp-links-opml.php Code Modernization: Replace `dirname( __FILE__ )` calls with `__DIR__` magic constant. 2020-02-06 06:33:11 +00:00
wp-load.php Docs: Miscellaneous DocBlock corrections. 2021-05-15 17:38:05 +00:00
wp-login.php Login and Registration: Check if `$_GET['login']` is set before using it in `wp-login.php`. 2021-04-06 18:39:10 +00:00
wp-mail.php Mail: Make the check for empty post title in `wp-mail.php` more resilient. 2020-04-14 11:32:06 +00:00
wp-settings.php Block Editor: Load the `WP_Theme_JSON_Resolver` class in `wp-admin/load-styles.php`. 2021-06-01 23:09:58 +00:00
wp-signup.php Docs: Improve documentation in `wp-signup.php`. 2021-08-31 12:25:00 +00:00
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readme.html

<!DOCTYPE html>
<html lang="en">
<head>
	<meta name="viewport" content="width=device-width" />
	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
	<title>WordPress &#8250; ReadMe</title>
	<link rel="stylesheet" href="wp-admin/css/install.css?ver=20100228" type="text/css" />
</head>
<body>
<h1 id="logo">
	<a href="https://wordpress.org/"><img alt="WordPress" src="wp-admin/images/wordpress-logo.png" /></a>
</h1>
<p style="text-align: center">Semantic Personal Publishing Platform</p>

<h2>First Things First</h2>
<p>Welcome. WordPress is a very special project to me. Every developer and contributor adds something unique to the mix, and together we create something beautiful that I&#8217;m proud to be a part of. Thousands of hours have gone into WordPress, and we&#8217;re dedicated to making it better every day. Thank you for making it part of your world.</p>
<p style="text-align: right">&#8212; Matt Mullenweg</p>

<h2>Installation: Famous 5-minute install</h2>
<ol>
	<li>Unzip the package in an empty directory and upload everything.</li>
	<li>Open <span class="file"><a href="wp-admin/install.php">wp-admin/install.php</a></span> in your browser. It will take you through the process to set up a <code>wp-config.php</code> file with your database connection details.
		<ol>
			<li>If for some reason this doesn&#8217;t work, don&#8217;t worry. It doesn&#8217;t work on all web hosts. Open up <code>wp-config-sample.php</code> with a text editor like WordPad or similar and fill in your database connection details.</li>
			<li>Save the file as <code>wp-config.php</code> and upload it.</li>
			<li>Open <span class="file"><a href="wp-admin/install.php">wp-admin/install.php</a></span> in your browser.</li>
		</ol>
	</li>
	<li>Once the configuration file is set up, the installer will set up the tables needed for your site. If there is an error, double check your <code>wp-config.php</code> file, and try again. If it fails again, please go to the <a href="https://wordpress.org/support/forums/">WordPress support forums</a> with as much data as you can gather.</li>
	<li><strong>If you did not enter a password, note the password given to you.</strong> If you did not provide a username, it will be <code>admin</code>.</li>
	<li>The installer should then send you to the <a href="wp-login.php">login page</a>. Sign in with the username and password you chose during the installation. If a password was generated for you, you can then click on &#8220;Profile&#8221; to change the password.</li>
</ol>

<h2>Updating</h2>
<h3>Using the Automatic Updater</h3>
<ol>
	<li>Open <span class="file"><a href="wp-admin/update-core.php">wp-admin/update-core.php</a></span> in your browser and follow the instructions.</li>
	<li>You wanted more, perhaps? That&#8217;s it!</li>
</ol>

<h3>Updating Manually</h3>
<ol>
	<li>Before you update anything, make sure you have backup copies of any files you may have modified such as <code>index.php</code>.</li>
	<li>Delete your old WordPress files, saving ones you&#8217;ve modified.</li>
	<li>Upload the new files.</li>
	<li>Point your browser to <span class="file"><a href="wp-admin/upgrade.php">/wp-admin/upgrade.php</a>.</span></li>
</ol>

<h2>Migrating from other systems</h2>
<p>WordPress can <a href="https://wordpress.org/support/article/importing-content/">import from a number of systems</a>. First you need to get WordPress installed and working as described above, before using <a href="wp-admin/import.php">our import tools</a>.</p>

<h2>System Requirements</h2>
<ul>
	<li><a href="https://secure.php.net/">PHP</a> version <strong>5.6.20</strong> or higher.</li>
	<li><a href="https://www.mysql.com/">MySQL</a> version <strong>5.0</strong> or higher.</li>
</ul>

<h3>Recommendations</h3>
<ul>
	<li><a href="https://secure.php.net/">PHP</a> version <strong>7.4</strong> or higher.</li>
	<li><a href="https://www.mysql.com/">MySQL</a> version <strong>5.6</strong> or higher.</li>
	<li>The <a href="https://httpd.apache.org/docs/2.2/mod/mod_rewrite.html">mod_rewrite</a> Apache module.</li>
	<li><a href="https://wordpress.org/news/2016/12/moving-toward-ssl/">HTTPS</a> support.</li>
	<li>A link to <a href="https://wordpress.org/">wordpress.org</a> on your site.</li>
</ul>

<h2>Online Resources</h2>
<p>If you have any questions that aren&#8217;t addressed in this document, please take advantage of WordPress&#8217; numerous online resources:</p>
<dl>
	<dt><a href="https://codex.wordpress.org/">The WordPress Codex</a></dt>
		<dd>The Codex is the encyclopedia of all things WordPress. It is the most comprehensive source of information for WordPress available.</dd>
	<dt><a href="https://wordpress.org/news/">The WordPress Blog</a></dt>
		<dd>This is where you&#8217;ll find the latest updates and news related to WordPress. Recent WordPress news appears in your administrative dashboard by default.</dd>
	<dt><a href="https://planet.wordpress.org/">WordPress Planet</a></dt>
		<dd>The WordPress Planet is a news aggregator that brings together posts from WordPress blogs around the web.</dd>
	<dt><a href="https://wordpress.org/support/forums/">WordPress Support Forums</a></dt>
		<dd>If you&#8217;ve looked everywhere and still can&#8217;t find an answer, the support forums are very active and have a large community ready to help. To help them help you be sure to use a descriptive thread title and describe your question in as much detail as possible.</dd>
	<dt><a href="https://make.wordpress.org/support/handbook/appendix/other-support-locations/introduction-to-irc/">WordPress <abbr>IRC</abbr> (Internet Relay Chat) Channel</a></dt>
		<dd>There is an online chat channel that is used for discussion among people who use WordPress and occasionally support topics. The above wiki page should point you in the right direction. (<a href="https://web.libera.chat/#wordpress">irc.libera.chat #wordpress</a>)</dd>
</dl>

<h2>Final Notes</h2>
<ul>
	<li>If you have any suggestions, ideas, or comments, or if you (gasp!) found a bug, join us in the <a href="https://wordpress.org/support/forums/">Support Forums</a>.</li>
	<li>WordPress has a robust plugin <abbr>API</abbr> (Application Programming Interface) that makes extending the code easy. If you are a developer interested in utilizing this, see the <a href="https://developer.wordpress.org/plugins/">Plugin Developer Handbook</a>. You shouldn&#8217;t modify any of the core code.</li>
</ul>

<h2>Share the Love</h2>
<p>WordPress has no multi-million dollar marketing campaign or celebrity sponsors, but we do have something even better&#8212;you. If you enjoy WordPress please consider telling a friend, setting it up for someone less knowledgeable than yourself, or writing the author of a media article that overlooks us.</p>

<p>WordPress is the official continuation of <a href="http://cafelog.com/">b2/caf&#233;log</a>, which came from Michel V. The work has been continued by the <a href="https://wordpress.org/about/">WordPress developers</a>. If you would like to support WordPress, please consider <a href="https://wordpress.org/donate/">donating</a>.</p>

<h2>License</h2>
<p>WordPress is free software, and is released under the terms of the <abbr>GPL</abbr> (GNU General Public License) version 2 or (at your option) any later version. See <a href="license.txt">license.txt</a>.</p>

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