----- I don't see what your problem is
It doesn't work as they thought it would?
That said -- the man page says under "-u":
-u, --update skip files that are newer on the receiver
Technically, directories are not files. Since you used the "-a" mode
you stated that you wanted owner+group, symlinks, _times_, special files
to all be synchronized. Since -u is documented to only work on files,
it seems correct.
----But i can only repeat myself. Rsync works unidirectional.
rsync uses a bidirection protocol. Perhaps you mean the changes
only happen on 1 side?
----You either copy something or not. Preserving a newer mtime on target would have to be activly done by rsync, which doesn't fall under "that is unidirectional".
Then how does "-u" work with files? If what you say is true, then
how would you preserve a newer mtime on the files on the target?
That is what "-u" does. Yet you claim this is impossible because
it isn't unidirectional?
I.e. From a technical standpoint, what would prevent any inode
being treated the same with respect to "--update"? All inodes
have "times" associated with them. Which times may be platform
specific, but within limitations of each platform -- what prevents
the "-u" that works on a file 'inode' from working on a directory 'inode'?
Honestly -- it surprises me that -u only applies to files
where it could apply to any inode. I can understand if it
isn't implemented on a platform where it doesn't work, but
otherwise... that's odd
Of note: though equally odd...gnu "cp -au" works
similarly:
Ishtar:/tmp> tree -guD src dst
src
|-- [law lp Jan 21 9:35] one
`-- [law lp Jan 21 9:32] two
dst
|-- [law tty Jan 21 10:00] one
`-- [law tty Jan 21 9:32] two
> cp -au src/. dst/.
Ishtar:/tmp> tree -guD src dst
src
|-- [law lp Jan 21 9:35] one
`-- [law lp Jan 21 9:32] two
dst
|-- [law lp Jan 21 9:35] one
`-- [law lp Jan 21 9:32] two
Their manpage also only refers to files:
-u, --update
copy only when the SOURCE file is newer than the destination
file or when the destination file is missing
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