[wp-trac] [WordPress Trac] #26710: Wrong redirect URL after core update when WP is in subdirectory

[WordPress Trac]

#26710: Wrong redirect URL after core update when WP is in subdirectory
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 Reporter:  tar.gz           |       Owner:
     Type:  defect (bug)     |      Status:  new
 Priority:  normal           |   Milestone:  Awaiting Review
Component:  Upgrade/Install  |     Version:  3.8
 Severity:  normal           |  Resolution:
 Keywords:                   |     Focuses:
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Comment (by tar.gz):

 Ok, I think I figured out a possible cause.

 What I recently noticed is that the issue affects:
 - freshly installed WordPress sites.
 - sites that are simply placed in a subdirectory.
 - sites that are running on shared hosting.

 Typical scenario:

 - The site is installed in a subdirectory, such as EXAMPLE.com/wp
 (WP_SITEURL and WP_HOME are identical)
 - The manual upgrade runs from EXAMPLE.com/wp/wp-admin/update-core.php
 - The site being hosted on a slow server, the install ends with the
 messages "Disabling maintenance mode...", "Database is being upgraded...",
 "WordPress database error: [MySQL server has gone away]".
 - The page then redirects to EXAMPLE.com/wp-admin/about.php?updated - this
 results in a 404 error.

 So, in the event that the database doesn't respond, the post-install
 action fails to retrieve the WP_SITEURL, and redirects the browser to the
 domain root (ignoring the current subdirectory).

 It's an edge case for sure, and I'm not sure if something can or should be
 done to fix this... just reporting.

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Ticket URL: <https://core.trac.wordpress.org/ticket/26710#comment:5>
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