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Sergey Biryukov 7e9421e4d0 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 backup kept in the temporary 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 `upgrade-temp-backup` directory is writable.
* A check that there is enough disk space available to safely perform updates.

To avoid confusion: The temporary 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.

Follow-up to [55204], [55220].

Props afragen, costdev, pbiron, azaozz, hellofromTonya, aristath, peterwilsoncc, TJNowell, bronsonquick, Clorith, dd32, poena, TimothyBlynJacobs, audrasjb, mikeschroder, a2hosting, KZeni, galbaras, richards1052, Boniu91, mai21, francina, TobiasBg, desrosj, noisysocks, johnbillion, dlh, chaion07, davidbaumwald, jrf, thisisyeasin, ignatggeorgiev, SergeyBiryukov.
Fixes #51857.
Built from https://develop.svn.wordpress.org/trunk@55720


git-svn-id: http://core.svn.wordpress.org/trunk@55232 1a063a9b-81f0-0310-95a4-ce76da25c4cd
 		2023-05-04 02:36:23 +00:00
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css Editor: Improve the tag field loading spinner alignment. 2023-04-26 21:38:21 +00:00
images Administration: Update dashboard welcome panel colors, remove broken link 2023-03-21 15:37:21 +00:00
includes Upgrade/Install: Create a temporary backup of plugins and themes before updating. 2023-05-04 02:36:23 +00:00
js Editor: Show scheduled text when changing to new future dates. 2023-03-18 16:35:18 +00:00
maint Coding Standards: Use strict comparison in `wp-admin/maint/repair.php`. 2023-04-11 16:30:22 +00:00
network Coding Standards: Remove unused `$key` variable in `wp-admin/network/sites.php`. 2023-04-21 13:34:18 +00:00
user Code Modernization: Replace `dirname( __FILE__ )` calls with `__DIR__` magic constant. 2020-02-06 06:33:11 +00:00
about.php Help/About: Left-align 6.2 about page subheading. 2023-05-03 22:32:19 +00:00
admin-ajax.php Coding Standards: Remove extra space in `wp-admin/admin-ajax.php`. 2022-05-07 16:21:18 +00:00
admin-footer.php Coding Standards: Simplify a condition in `wp-admin/admin-footer.php`. 2021-06-01 11:30:57 +00:00
admin-functions.php Code Modernization: Replace `dirname( __FILE__ )` calls with `__DIR__` magic constant. 2020-02-06 06:33:11 +00:00
admin-header.php Docs: Add missing description for `$typenow` global in various functions. 2022-04-04 18:39:01 +00:00
admin-post.php Administration: Require a valid action parameter to be set for `admin-ajax.php` requests. 2022-03-02 15:00:11 +00:00
admin.php Docs: Add missing description for `$taxnow` global in various functions. 2022-04-04 18:43:02 +00:00
async-upload.php Media: Remove target blank attribute from media uploader edit links. 2022-01-27 22:17:00 +00:00
authorize-application.php Docs: Various corrections and improvements to inline documentation. 2022-08-04 14:52:11 +00:00
comment.php Help/About: Use the new `/documentation/` URLs for HelpHub links in WordPress Admin. 2023-02-23 10:38:21 +00:00
credits.php Help/About: Update copy & style for About page and subpages. 2023-03-09 16:30:19 +00:00
custom-background.php Code Modernization: Replace `dirname( __FILE__ )` calls with `__DIR__` magic constant. 2020-02-06 06:33:11 +00:00
custom-header.php Code Modernization: Replace `dirname( __FILE__ )` calls with `__DIR__` magic constant. 2020-02-06 06:33:11 +00:00
customize.php Help/About: Avoid extra redirections on HelpHub Links. 2023-02-28 12:52:18 +00:00
edit-comments.php I18N: Correct translator comments placement in `wp-admin/edit-comments.php`. 2023-04-06 16:44:22 +00:00
edit-form-advanced.php Help/About: Avoid extra redirections on HelpHub Links. 2023-02-23 11:06:19 +00:00
edit-form-blocks.php Themes: Introduce wp_theme_has_theme_json() for public consumption. 2023-01-18 11:40:10 +00:00
edit-form-comment.php I18N: Mark screen reader strings as such with translator comments. 2023-02-07 17:10:21 +00:00
edit-link-form.php Help/About: Use the new `/documentation/` URLs for HelpHub links in WordPress Admin. 2023-02-23 10:38:21 +00:00
edit-tag-form.php Networks and Sites: Officially remove global terms. 2022-09-20 02:51:09 +00:00
edit-tags.php Help/About: Use the new `/documentation/` URLs for HelpHub links in WordPress Admin. 2023-02-23 10:38:21 +00:00
edit.php I18N: Correct translator comments placement in `wp-admin/edit-comments.php`. 2023-04-06 16:44:22 +00:00
erase-personal-data.php Help/About: Use the new `/documentation/` URLs for HelpHub links in WordPress Admin. 2023-02-23 10:38:21 +00:00
export-personal-data.php Help/About: Use the new `/documentation/` URLs for HelpHub links in WordPress Admin. 2023-02-23 10:38:21 +00:00
export.php Help/About: Use the new `/documentation/` URLs for HelpHub links in WordPress Admin. 2023-02-23 10:38:21 +00:00
freedoms.php Help/About: Update copy & style for About page and subpages. 2023-03-09 16:30:19 +00:00
import.php Help/About: Use the new `/documentation/` URLs for HelpHub links in WordPress Admin. 2023-02-23 10:38:21 +00:00
index.php Help/About: Use the new `/documentation/` URLs for links about WordPress version. 2023-04-04 22:38:22 +00:00
install-helper.php Docs: Fix typo and improve DocBlock formatting in `wp-admin/install-helper.php`. 2022-11-20 14:10:15 +00:00
install.php Help/About: Use the new `/documentation/` URLs for links about WordPress version. 2023-04-04 22:38:22 +00:00
link-add.php Docs: Add a comment about the `$title` global usage in various admin files. 2021-07-22 13:53:00 +00:00
link-manager.php Help/About: Use the new `/documentation/` URLs for HelpHub links in WordPress Admin. 2023-02-23 10:38:21 +00:00
link-parse-opml.php XML-RPC: Explicitly unset the reference to the parser resource after calling `xml_parser_free()` to avoid memory leaks in PHP 7.0.0 or higher. 2020-07-05 15:22:01 +00:00
link.php Coding Standards: Apply some alignment fixes from `composer format`. 2021-07-27 19:01:59 +00:00
load-scripts.php Docs: Update a comment in `wp-admin/load-styles.php` per the documentation standards. 2021-12-12 14:52:02 +00:00
load-styles.php General: Restore `strpos()` check in `wp-admin/load-styles.php`. 2023-05-03 15:46:22 +00:00
media-new.php Help/About: Use the new `/documentation/` URLs for HelpHub links in WordPress Admin. 2023-02-23 10:38:21 +00:00
media-upload.php Docs: Add examples of possible names for various hooks whose name contains a dynamic portion. 2021-03-07 12:32:09 +00:00
media.php Media: Deprecate `wp-admin/media.php`. 2023-04-11 22:26:18 +00:00
menu-header.php Code Modernization: Replace usage of `strpos()` with `str_starts_with()`. 2023-05-02 15:45:22 +00:00
menu.php Code Modernization: Replace usage of `strpos()` with `str_starts_with()`. 2023-05-02 15:45:22 +00:00
moderation.php Code Modernization: Replace `dirname( __FILE__ )` calls with `__DIR__` magic constant. 2020-02-06 06:33:11 +00:00
ms-admin.php Code Modernization: Replace `dirname( __FILE__ )` calls with `__DIR__` magic constant. 2020-02-06 06:33:11 +00:00
ms-delete-site.php Text Changes: Improve the wording of the email sent to confirm site deletion. 2022-11-14 21:57:10 +00:00
ms-edit.php Code Modernization: Replace `dirname( __FILE__ )` calls with `__DIR__` magic constant. 2020-02-06 06:33:11 +00:00
ms-options.php Code Modernization: Replace `dirname( __FILE__ )` calls with `__DIR__` magic constant. 2020-02-06 06:33:11 +00:00
ms-sites.php Code Modernization: Replace `dirname( __FILE__ )` calls with `__DIR__` magic constant. 2020-02-06 06:33:11 +00:00
ms-themes.php Code Modernization: Replace `dirname( __FILE__ )` calls with `__DIR__` magic constant. 2020-02-06 06:33:11 +00:00
ms-upgrade-network.php Code Modernization: Replace `dirname( __FILE__ )` calls with `__DIR__` magic constant. 2020-02-06 06:33:11 +00:00
ms-users.php Code Modernization: Replace `dirname( __FILE__ )` calls with `__DIR__` magic constant. 2020-02-06 06:33:11 +00:00
my-sites.php Networks and Sites: Use consistent markup for admin notices. 2023-02-23 22:13:23 +00:00
nav-menus.php Administration: Define the `$title` global on the Menus screen for classic themes. 2023-03-15 09:05:22 +00:00
network.php Help/About: Use the new `/documentation/` URLs for HelpHub links in WordPress Admin. 2023-02-23 10:38:21 +00:00
options-discussion.php Help/About: Use the new `/documentation/` URLs for HelpHub links in WordPress Admin. 2023-02-23 10:38:21 +00:00
options-general.php Help/About: Improve help text about the WordPress URL and Site URL settings. 2023-03-01 17:03:19 +00:00
options-head.php Administration: Replace legacy `updated` message type in `add_settings_error()` calls with `success`. 2019-08-16 00:39:55 +00:00
options-media.php Help/About: Use the new `/documentation/` URLs for HelpHub links in WordPress Admin. 2023-02-23 10:38:21 +00:00
options-permalink.php Code Modernization: Replace usage of `strpos()` with `str_starts_with()`. 2023-05-02 15:45:22 +00:00
options-privacy.php Coding Standards: Use `__DIR__` magic constant in `wp-admin/options-privacy.php`. 2023-04-27 13:14:23 +00:00
options-reading.php Help/About: Use the new `/documentation/` URLs for HelpHub links in WordPress Admin. 2023-02-23 10:38:21 +00:00
options-writing.php Help/About: Use the new `/documentation/` URLs for HelpHub links in WordPress Admin. 2023-02-23 10:38:21 +00:00
options.php Coding Standards: Correct the closing PHP tag placement in some admin files. 2023-04-03 12:00:27 +00:00
plugin-editor.php Help/About: Use the new `/documentation/` URLs for HelpHub links in WordPress Admin. 2023-02-23 10:38:21 +00:00
plugin-install.php Help/About: Use the new `/documentation/` URLs for HelpHub links in WordPress Admin. 2023-02-23 10:38:21 +00:00
plugins.php Help/About: Avoid extra redirections on HelpHub Links. 2023-02-23 11:06:19 +00:00
post-new.php Coding Standards: Use strict comparison where static strings are involved. 2020-05-16 18:42:12 +00:00
post.php Administration: Replace contracted verb forms for better consistency. 2022-03-22 16:25:03 +00:00
press-this.php Code Modernization: Replace `dirname( __FILE__ )` calls with `__DIR__` magic constant. 2020-02-06 06:33:11 +00:00
privacy-policy-guide.php Coding Standards: Replace `include_once` with `require_once` for required files. 2023-04-09 11:57:22 +00:00
privacy.php Help/About: Update copy & style for About page and subpages. 2023-03-09 16:30:19 +00:00
profile.php Code Modernization: Replace `dirname( __FILE__ )` calls with `__DIR__` magic constant. 2020-02-06 06:33:11 +00:00
revision.php Help/About: Use the new `/documentation/` URLs for HelpHub links in WordPress Admin. 2023-02-23 10:38:21 +00:00
setup-config.php Help/About: Use the new `/documentation/` URLs for HelpHub links in WordPress Admin. 2023-02-23 10:38:21 +00:00
site-editor.php Editor: Fix 'wp-block-library-theme' style enqueue conditions. 2023-02-20 21:13:27 +00:00
site-health-info.php Site Health: Internationalizes count in the info section headings. 2021-11-01 22:36:59 +00:00
site-health.php Help/About: Use the new `/documentation/` URLs for HelpHub links in WordPress Admin. 2023-02-23 10:38:21 +00:00
term.php General: Replace all `esc_url_raw()` calls in core with `sanitize_url()`. 2022-06-01 18:14:10 +00:00
theme-editor.php Help/About: Restore the correct URL for Editing Files article on Edit Themes screen. 2023-02-28 13:52:20 +00:00
theme-install.php Help/About: Use the new `/documentation/` URLs for HelpHub links in WordPress Admin. 2023-02-23 10:38:21 +00:00
themes.php Help/About: Avoid extra redirections on HelpHub Links. 2023-02-23 11:06:19 +00:00
tools.php Help/About: Use the new `/documentation/` URLs for HelpHub links in WordPress Admin. 2023-02-23 10:38:21 +00:00
update-core.php Help/About: Use the new `/documentation/` URLs for links about WordPress version. 2023-04-04 22:43:23 +00:00
update.php Coding Standards: Replace `include_once` with `require_once` for required files. 2023-04-09 11:57:22 +00:00
upgrade-functions.php Code Modernization: Replace `dirname( __FILE__ )` calls with `__DIR__` magic constant. 2020-02-06 06:33:11 +00:00
upgrade.php Help/About: Use the new `/documentation/` URLs for links about WordPress version. 2023-04-04 22:38:22 +00:00
upload.php Coding Standards: Correct `sprintf()` calls for messages in `wp-admin/upload.php`. 2023-04-06 17:39:24 +00:00
user-edit.php Coding Standards: Apply various alignment corrections from `composer format`. 2023-03-29 07:13:23 +00:00
user-new.php Help/About: Use the new `/documentation/` URLs for HelpHub links in WordPress Admin. 2023-02-23 10:38:21 +00:00
users.php Coding Standards: Use strict comparison in `wp-admin/users.php`. 2023-04-04 21:12:24 +00:00
widgets-form-blocks.php Editor: Update preload paths for post, site and widgets editors 2022-04-07 13:40:04 +00:00
widgets-form.php Coding Standards: Correct the closing PHP tag placement in some admin files. 2023-04-03 12:00:27 +00:00
widgets.php Administration: Replace contracted verb forms for better consistency. 2022-03-22 19:59:04 +00:00