[Bug 286107] ports-mgmt/pkg: improvement request: only install files whose checksum have changed

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=286107

            Bug ID: 286107
           Summary: ports-mgmt/pkg: improvement request: only install
                    files whose checksum have changed
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: pkg@FreeBSD.org
          Reporter: d8zNeCFG@aon.at
             Flags: maintainer-feedback?(pkg@FreeBSD.org)
          Assignee: pkg@FreeBSD.org

Scenario:
- FreeBSD stable/14
- ports latest
- upgrading ports using 'pkg upgrade'

Result:
- All files of the old ports are removed, then all files of the updated ports
are installed
- For many ports, the contents of most files do not change at all
- This results in unnecessary disk churn, SSD wear level increase, backup size
increase, etc.

Desired result:
- 'pkg upgrade' should compute the differences between the old and the new
installed files, most likely using their checksum
- 'pkg upgrade' should then delete and add files as necessary to implement the
new pkg plist.
- Unchanged files should not be touched at all, not even their mtime.
- This would help a lot especially with the big ports: KDE, LibreOffice, ...

-- Martin

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