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CPack/DMG: Add explicit option to use CPACK_RESOURCE_FILE_LICENSE for SLA

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Since macOS 12.0, the ``hdiutil udifrez`` and ``hdiutil udifderez``
commands to embed and extract resources in a disk image are deprecated.
The CPack DragNDrop Generator uses these to attach the SLA specified by
the `CPACK_RESOURCE_FILE_LICENSE` option.  Since that option is shared
by multiple CPack generators, we cannot deprecate it.  Instead, add an
explicit option to control the behavior.  This will give projects a way
to package on future macOS versions that remove the commands.

In order to provide a long-term transition away from attaching SLAs to
disk images, update `cpack` to default this behavior to OFF.  To retain
compatibility for CMake projects, teach the CPack module to default the
option to ON.  Later a policy can be added to change the default.

Issue: #22978
This commit is contained in:
Brad King
2022-01-14 11:40:23 -05:00
parent 542ba6ac1a
commit 9e38bfa915
9 changed files with 64 additions and 3 deletions
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Help/release/dev/cpack-dmg-sla.rst
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cpack-dmg-sla
-------------
* The :cpack_gen:`CPack DragNDrop Generator` no longer attaches
:variable:`CPACK_RESOURCE_FILE_LICENSE` as the license agreement in
the generated ``.dmg`` unless explicitly activated by a
:variable:`CPACK_DMG_SLA_USE_RESOURCE_FILE_LICENSE` option.
In CMake projects, the :module:`CPack` module enables the option
by default for compatibility.