mainGNU Core Utilities - Support: sr #107876, ISSUE: (Unverifyed Bug in 8.13).


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sr #107876: ISSUE: (Unverifyed Bug in 8.13).

Submitter:  Linda A. Walsh <law>
Submitted:  Tue 15 Nov 2011 06:28:11 PM UTC
Category:  None Priority:  5 - Normal
Severity:  3 - Normal Status:  None
Privacy:  Public Assigned to:  None
Open/Closed:  Open Operating System:  None

Tue 15 Nov 2011 06:28:11 PM UTC, original submission:  

it appears from the change log, that a bug was introduced in 8.13.

The Comment was:

cp -au (where --preserve=links is implicit) may now replace newer
files in the destination, to mirror hard links from the source.


However, in copying the files on the target,
if the files are NOT linked in the destination, then
it would seem we have the case where we start with

a <=> b


a (dup of a src), b (newer file than src) ; broken links;

Then correct action (if it behaves this way, fine, but it doesn't sound like it)...

if -u flag is used, we only update newer file items...

so, after a cp -au, the above condition would remain
exactly the same.

Unless, if 'a' was updated (and thus, 'b' is also "updated to be newer than target "b"), then
src-b would overwrite dst-b
if a updated, but has time < dst 'b', then 'b'
'a' should not create an older, linked version of 'b', in place of a newer 'b' on the destination.

if 'b' on the src is updated (thus 'a' is updated as well by being linked), and 'b' is newer than dst-b), then
the linked relationship would be copied to the dst (both
a+b copied and linked).

But the key here is that an updated 'a' linked to 'b' on src,
shoudln't overwrite, recreate a link to b on dst IF dst-b is NEWER than the 'b' that would be created.

i.e. while -a says to preserve links, in the presense of -u, one would expect the newest copies to remain on the dst, as
forcing a link in all cases, would break the semantics of "-u".

i.e. use of -u should override -a-'s keep links...(warning/verbose or maybe some 'message on exception'...


Linda A. Walsh <law>


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