Re: [RFC PATCH] Add SHA1 support
On Thursday, February 20, 2020 10:34:53 PM CET, Sebastian Andrzej Siewior via rsync wrote: I'm still not sure if rsync requires a cryptographic hash _or_ if a strong hash like xxHash64 would be just fine for the job. I'm fairly sure the hash should *not* be easy to spoof, so I'd say a cryptographic hash is needed. As an example, if a file is replaced by a file of the same size and same hash, rsync (if -c is in use) will consider the file is the same, and avoid copying it. Dimitris -- Please use reply-all for most replies to avoid omitting the mailing list. To unsubscribe or change options: https://lists.samba.org/mailman/listinfo/rsync Before posting, read: http://www.catb.org/~esr/faqs/smart-questions.html
Re: Would you expect --perms -M--fake-super to set the file mode to the original one?
According to --help: --fake-superstore/recover privileged attrs using xattrs So I would assume which mode it uses when it reads the file, depends on whether this option is on or off. On Monday, March 16, 2020 9:09:36 PM CET, Kevin Korb via rsync wrote: I don't believe it is possible. I think the misunderstanding stems from the fact that the permissions are even stored in the xattr. They don't need to be there but they may as well be. They don't take much space. The real question would be when rsync reads the file to restore it and the file perms are different than the ones in the xattr which set does it use? On 3/16/20 10:01 AM, Dimitrios Apostolou via rsync wrote: Thanks. This is a bit counter-intuitive to me. So how would you tell rsync to store the original permissions in the xattr, but do not touch the real file mode? On Thursday, March 12, 2020 6:26:18 PM CET, Kevin Korb via rsync wrote: ... -- Please use reply-all for most replies to avoid omitting the mailing list. To unsubscribe or change options: https://lists.samba.org/mailman/listinfo/rsync Before posting, read: http://www.catb.org/~esr/faqs/smart-questions.html
Re: Would you expect --perms -M--fake-super to set the file mode to the original one?
I don't believe it is possible. I think the misunderstanding stems from the fact that the permissions are even stored in the xattr. They don't need to be there but they may as well be. They don't take much space. The real question would be when rsync reads the file to restore it and the file perms are different than the ones in the xattr which set does it use? On 3/16/20 10:01 AM, Dimitrios Apostolou via rsync wrote: > Thanks. This is a bit counter-intuitive to me. So how would you tell > rsync to store the original permissions in the xattr, but do not touch > the real file mode? > > On Thursday, March 12, 2020 6:26:18 PM CET, Kevin Korb via rsync wrote: >> I would expect that the sending rsync would only send the perms provided >> modified by the --chmod. I wouldn't expect the receiver to even know >> the other permissions. >> >> On 3/12/20 1:23 PM, Dimitrios Apostolou via rsync wrote: >>> Thank you for the feedback, I'm glad to see that different people see >>> the issue >>> differently. As a followup question, what would you expect this to do: >>> >>> rsync --perms --chmod g+rX -M--fake-super src dst >>> >>> I would expect it to store the original permissions in the xattr, >>> while ... >> > > -- ~*-,._.,-*~'`^`'~*-,._.,-*~'`^`'~*-,._.,-*~'`^`'~*-,._.,-*~'`^`'~*-,._., Kevin Korb Phone:(407) 252-6853 Systems Administrator Internet: FutureQuest, Inc. ke...@futurequest.net (work) Orlando, Floridak...@sanitarium.net (personal) Web page: https://sanitarium.net/ PGP public key available on web site. ~*-,._.,-*~'`^`'~*-,._.,-*~'`^`'~*-,._.,-*~'`^`'~*-,._.,-*~'`^`'~*-,._., signature.asc Description: OpenPGP digital signature -- Please use reply-all for most replies to avoid omitting the mailing list. To unsubscribe or change options: https://lists.samba.org/mailman/listinfo/rsync Before posting, read: http://www.catb.org/~esr/faqs/smart-questions.html
Re: Would you expect --perms -M--fake-super to set the file mode to the original one?
Thanks. This is a bit counter-intuitive to me. So how would you tell rsync to store the original permissions in the xattr, but do not touch the real file mode? On Thursday, March 12, 2020 6:26:18 PM CET, Kevin Korb via rsync wrote: I would expect that the sending rsync would only send the perms provided modified by the --chmod. I wouldn't expect the receiver to even know the other permissions. On 3/12/20 1:23 PM, Dimitrios Apostolou via rsync wrote: Thank you for the feedback, I'm glad to see that different people see the issue differently. As a followup question, what would you expect this to do: rsync --perms --chmod g+rX -M--fake-super src dst I would expect it to store the original permissions in the xattr, while ... -- Please use reply-all for most replies to avoid omitting the mailing list. To unsubscribe or change options: https://lists.samba.org/mailman/listinfo/rsync Before posting, read: http://www.catb.org/~esr/faqs/smart-questions.html
atimes+ctimes patch
schilytools star has the ability to restore ctimes from tarfiles. This is useful when restoring filesystems as root in single user mode, and I thought I'd like rsync to do the same. I started working off the rsync-patches/atimes.diff patch but noticed that this patch is buggy and presently does not work. (It fails to set the atime and it fails to set the mtime too). Even if this is fixed that patch does not provide for setting nanosecond times. The way nanosecond mtimes are presently handled is clunky and I am looking for advice on how to proceed: - would one want to use the st_ctim, st_atim st_mtim - struct timespec structures in struct stat - when available. If the code to handle nanosecond times for mtime is cleaned up it could be reused consistently for the ctime and atimes and [1] in patches It would be possible to produce a new patch which incorporated new options atimes (-U --atimes) and (-W --ctimes) - with the caveat that -W has to be run as root and messes with the system clock, and maybe support --ctimes --atimes only st_ctim, etc. is available) If anyone has already done this work or thought about it (or can point to another project which has done this) I'd be glad for advice. [1] and possibly birthtimes (by setting the clock before a creat but that is too ugly even for me to contemplate) -- Please use reply-all for most replies to avoid omitting the mailing list. To unsubscribe or change options: https://lists.samba.org/mailman/listinfo/rsync Before posting, read: http://www.catb.org/~esr/faqs/smart-questions.html
