Rsync: How to Delete Files on Receiving Side with Exceptions

rsync

I have read these threads:

But, as far as I can tell (maybe I am missing something), they don't cover the following question:

How do you ask rsync to copy files and delete those on the receiving side that do not exist on the sending side, with exceptions? (e.g. don't remove a mercurial repository .hg on the receiving side, even if there is no repository on the sending side).

One possibility?

Borrowing from @Richard Holloway's answer below. Say I have the following line:

rsync -av --exclude=dont_delete_me --delete /sending/path /receiving/path

As far as I understand, this line would make rsync delete everything on the receiving path that does not exist on the sending path, except those things matched by dont_delete_me. My question now is: Would rsync keep files on the receiving side that are matched by dont_delete_me even if nothing on the sending side matches dont_delete_me?

Best Answer

If you use --delete and --exclude together what is in the excluded location won't get deleted even if the source files are removed.

But that raises the issue that the folder won't be rsync'd at all. So you will need another rsync job to sync that folder.

Eg.

rsync -nav /home/richardjh/keepall/ /home/backup/richardjh/keepall/
rsync -nav --exclude=keepall --delete /home/richardjh /home/backup/richardjh

You could run these the other way around, but then it would delete all removed files and then replace them, which is not as efficient.

You can't do it as a one liner.

Related Solutions

Rsync, delete files on receiving side that were deleted on sending side. (But don’t delete everything)

What you want to do is reasonable, but using rsync to do it on its own is not. So the answer is no.

The reason is simple: rsync keeps no history of what was in each directory and has no way of knowing what needs to be deleted and what not. Not without additional support.

You should ask yourself why you like to do this with rsync and make that more clear. There are other programs that use librsync1.so that are more intelligent.

With the relaxed constraints that you don't need rsync per se, you can take a look at rdiff-backup:

mkdir a
touch a/xx
touch a/yy
rdiff-backup a b
ls b

This shows xx and yy are in b.

touch b/zz
rm a/xx
rdiff-backup a b

This shows xx and zz are in b. rdiff-backup also keeps a directory rdiff-backup-data in b so you can rollback any changes, you should purge this on a regular basis using the rdiff-backup commands. (The example is with local files to show extra data in the target does not get deleted, but rdiff-backup works over a network as well).

Another alternative is to setup some distributed revision control system (mercurial, bazaar, git). With mercurial e.g. you can have a script (I use a Makefile for that), that pushes all the changes to the server and then does an update of the checked out files there, ignore any additional files that are on the remote server (but have not been put under revision control).

On the server you would do:

hg init
hg add file_list_excluding_that_should_not_should_be_deleted_if_not_on_client
hg commit -m "initial setup"

On the client:

hg clone ssh://username@server/dir_to_repository

Now if you remove a file on the client and do:

hg commit -m "removed file"
ssh username@server "cd dir_to_repository; hg update --clean"

Your removed file is removed on the server, but any other data (not added to the repository) does not get deleted.

Rsync delete only excluded files

The use of filters might meet your requirements:

--filter='P /some/dir'

One possibility?

Best Answer

Related Solutions

Rsync, delete files on receiving side that were deleted on sending side. (But don’t delete everything)

Rsync delete only excluded files

Related Question