[wp-trac] [WordPress Trac] #42590: Failure to update Plugins

[WordPress Trac]

#42590: Failure to update Plugins
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 Reporter:  showcasedan   |       Owner:
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  Plugins       |     Version:  4.9
 Severity:  major         |  Resolution:
 Keywords:                |     Focuses:
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Comment (by dd32):

 Hey @showcasedan

 As far as I know, nothing was changed in 4.9 specifically related to
 plugin updates.
 Does the error output include the filename of the file(s) that it's failed
 to copy? The error you've run into is specifically checking to see if it
 can write to the filesystem / or the files being modified.

 Does your plugin include a custom `WP_Upgrader` class for the upgrade?
 Can you, on the same site, downgrade to 4.8.3 and have the upgrade
 succeed?
 Can you install other plugins? upgrade other plugins? themes?

 How were the 4.9 updates completed? Are they on the same hosting platform?
 Something we've seen in the past is that the WordPress files end up being
 owned by the incorrect users when the upgrade is performed by the system,
 resulting in plugin files being unmodifiable.

 Unfortunately this is likely a case where you'll have to debug a
 problematic site and trace the error down, so that we can reproduce the
 issue.

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Ticket URL: <https://core.trac.wordpress.org/ticket/42590#comment:3>
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