share now checks both common NT_STATUS_ACCESS_DENIED causes before writing the
config (warnings only — the share is still applied):
- --users entries missing from the Samba passdb (pdbedit -L) get a warning
pointing at 'pos share smb-server adduser <user>' — valid users = <u> with
no Samba password previously failed for clients with no clue why.
- every ancestor of the share path is checked for other:+x traversal (sticky
dirs like /tmp count as traversable); a 700 home dir under the share path
now warns with 'chmod o+x <dir>'.
Docs: howto/share.md SMB section + NT_STATUS_ACCESS_DENIED troubleshooting.
Verified with a stub-PATH suite (pdbedit/systemctl/smbcontrol/testparm stubs,
SMB_CONF seam): 16/16 green.
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