[Bug 1859018] [NEW] [UBUNTU] zkey: Fix listing of keys on file systems reporting DT_UNKNOWN.

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Description:   zkey: Fix listing of keys on file systems reporting DT_UNKNOWN.
Symptom:       When the zkey key repository is located in a file system that
               does not have full support for report the file type, such as
               XFS, the 'zkey list' command does not show any keys, although
               keys exist in the repository.
Problem:       The zkey list function uses scandir() to look for files in the
               zkey key repository directory. It checks the dirent.d_type field
               to consider only regular files, but skips all others. File
               systems that do not have full support for returning the file
               type in d_type will return DT_UNKNOWN instead. zkey skips
               those directory entries and thus does not show any keys.
Solution:      Also consider directory entries with d_type = DT_UNKNOWN.
Reproduction:  Use zkey with a zkey repository directory located in a file
               system that does not have full support for returning the file
               type, such as XFS. Generate a key in the repository and then
               list the key s with 'zkey list'.
               Note: Newly created XFS file systems usually support returning
               the file type, but existing XFS file systems might not. To
               create an XFS file system that does not support returning the
               file type, use 'mkfs.xfs -f -m crc=0 -n ftype=0' to create
               the file system.

Upstream-ID:   0de533aef9def920fed751c6025e4f19c4cba763

Component:     s390-tools

Need to be applied to all distro in service

** Affects: s390-tools (Ubuntu)
     Importance: Undecided
     Assignee: Skipper Bug Screeners (skipper-screen-team)
         Status: New


** Tags: architecture-s39064 bugnameltc-183137 severity-high targetmilestone-inin2004
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[UBUNTU] zkey: Fix listing of keys on file systems reporting DT_UNKNOWN.
https://bugs.launchpad.net/bugs/1859018
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