[wp-trac] [WordPress Trac] #42196: WP_Upgrader->unpack_package can't run in parallel

[WordPress Trac]

#42196: WP_Upgrader->unpack_package can't run in parallel
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 Reporter:  sheldonh      |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  General       |    Version:
 Severity:  normal        |   Keywords:
  Focuses:                |
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 Although `WP_Upgrader->unpack_package` takes care to assign a unique
 `$working_dir` for the package being unpacked, it recursively deletes the
 contents of `$upgrade_folder` before it does its work.

 Since `$upgrade_folder` is the parent of `$working_dir`, concurrent
 `unpack_package` calls interfere with each other. In particular, this
 defeats parallel `wp theme install`; one install is likely to encounter
 `ENOENT` while trying to copy it unpacked files out of `$working_dir`.

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Ticket URL: <https://core.trac.wordpress.org/ticket/42196>
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