Issue 52 – Use file hash as criterion for synchronization

2008-05-23 14:59

Alternative is to download remote file to temporary location and calculate hash locally. This would make sense only if download is considerably faster than upload. Otherwise it would be faster to simply transfer whole tree instead of using synchronization.

However obviously this is much harder to implement (efficiently) than remote-side hashing.

https://winscp.net/forum/viewtopic.php?t=5626

2010-02-07 07:59

https://winscp.net/forum/viewtopic.php?t=7964

2010-06-28 08:05

https://winscp.net/forum/viewtopic.php?t=8581

2010-10-20 08:14

https://winscp.net/forum/viewtopic.php?t=9014

2015-05-04 09:10

https://winscp.net/forum/viewtopic.php?t=15334

2019-09-27 10:37

https://winscp.net/forum/viewtopic.php?t=28296

2021-12-13 10:37

https://winscp.net/forum/viewtopic.php?t=31773

2022-07-16 07:16

First step:
File checksum calculation support for SCP protocol and SFTP protocol via secondary shell session using shell commands like sha256sum
Commit b4c490b4

2022-12-12 12:31

https://winscp.net/forum/viewtopic.php?t=32902

2023-04-11 10:59

https://winscp.net/forum/viewtopic.php?t=33315

2023-08-04 13:16

https://winscp.net/forum/viewtopic.php?t=33638

2023-11-07 07:24

Implemented.
Commit 804ec9c9

2023-12-06 15:20

Documented:
https://winscp.net/eng/docs/ui_synchronize#criteria
https://winscp.net/eng/docs/scriptcommand_synchronize#criteria
https://winscp.net/eng/docs/rawconfig#interface_synchronizeparams
https://winscp.net/eng/docs/library_session_synchronizedirectories#criteria
https://winscp.net/eng/docs/library_session_comparedirectories#criteria

2024-02-20 16:01

Caused Issue 2260.

2024-05-23 17:32

Caused Issue 2291.