[MacPorts] #67336: BSD tar can create corrupted archives on Catalina, Big Sur, Monterey, Ventura

[MacPorts]

#67336: BSD tar can create corrupted archives on Catalina, Big Sur, Monterey,
Ventura
-------------------------+-------------------------------------------------
  Reporter:  catap       |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  High        |  Milestone:
 Component:  base        |    Version:  2.8.1
Resolution:              |   Keywords:  catalina, bigsur, monterey,
      Port:              |  ventura, sonoma, sequoia
-------------------------+-------------------------------------------------

Comment (by jmroot):

 OK, so things to try in no particular order:
  * ask the OS if there are holes in the files the same way that bsdtar
 does, and only apply workarounds if it says yes
  * fsync on the files
  * fcntl F_FULLFSYNC
  * fcntl F_NOCACHE
  * add `--no-read-sparse` when supported

 Do we have any simplified test case that can be used to figure out which
 of these actually helps?

-- 
Ticket URL: <https://trac.macports.org/ticket/67336#comment:38>
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