rsync delete files from target if not existing in source

Question

Okay so I have looked up the existing answers here and elsewhere but what I can't find out is, if I use the --ignore-existing option along with the --delete option, will this combination I still be able to have rsync delete files from the target if they no longer exist in the source AND still prevent rsync from overwriting existing files in the target?

Thanks

Answer 1

Yes, --delete and --ignore-existing options of rsync will work together.

Here is a test (check the modification times especially):

:~/foo$ ls -l
-rw-rw-r-- 1 user user 0 Mar 27 14:38 egg.txt
-rw-rw-r-- 1 user user 0 Mar 27 14:38 ignore.txt
-rw-rw-r-- 1 user user 0 Mar 27 14:38 spam.txt

:~/bar$ ls -l
-rw-rw-r-- 1 user user 0 Mar 27 14:40 ignore.txt
-rw-rw-r-- 1 user user 0 Mar 27 14:40 remove.txt

$ rsync -r --delete --ignore-existing ~/foo/ ~/bar/

:~/bar$ ls -l
-rw-rw-r-- 1 user user 0 Mar 27 14:42 egg.txt
-rw-rw-r-- 1 user user 0 Mar 27 14:40 ignore.txt
-rw-rw-r-- 1 user user 0 Mar 27 14:42 spam.txt

Answer 2

This works only partially

From rsync man page:

[..]
--delete                delete extraneous files from dest dirs
[..]
--ignore-existing       skip updating files that exist on receiver
[..]

Example:

% ls ~/tmp/A       
123  456
% ls ~/tmp/B
456

% rsync --recursive --ignore-existing --delete ~/tmp/A/ ~/tmp/B
% ls ~/tmp/B                                                   
123  456

% rm ~/tmp/A/456

% rsync --recursive --ignore-existing --delete ~/tmp/A/ ~/tmp/B
% ls ~/tmp/B                                                   
123

% touch ~/tmp/B/789
% ls ~/tmp/B       
123  789

% rsync --recursive --ignore-existing --delete ~/tmp/A/ ~/tmp/B
% ls ~/tmp/B                                                   
123

Now pay attention to the change date of 456

% ls -la ~/tmp/A
insgesamt 8
drwxrwxr-x 2 aboettger aboettger 4096 Mär 27 09:41 .
drwxrwxr-x 7 aboettger aboettger 4096 Mär 27 09:25 ..
-rw-rw-r-- 1 aboettger aboettger    0 Mär 27 09:35 123
-rw-rw-r-- 1 aboettger aboettger    0 Mär 27 09:42 456

% rsync --recursive --ignore-existing --delete ~/tmp/A/ ~/tmp/B

% ls -la ~/tmp/B                                               
insgesamt 8
drwxrwxr-x 2 aboettger aboettger 4096 Mär 27 09:45 .
drwxrwxr-x 7 aboettger aboettger 4096 Mär 27 09:25 ..
-rw-rw-r-- 1 aboettger aboettger    0 Mär 27 09:35 123
-rw-rw-r-- 1 aboettger aboettger    0 Mär 27 09:42 456

% touch ~/tmp/A/456

% ls -la ~/tmp/A   
insgesamt 8
drwxrwxr-x 2 aboettger aboettger 4096 Mär 27 09:41 .
drwxrwxr-x 7 aboettger aboettger 4096 Mär 27 09:25 ..
-rw-rw-r-- 1 aboettger aboettger    0 Mär 27 09:35 123
-rw-rw-r-- 1 aboettger aboettger    0 Mär 27 09:46 456

% rsync --recursive --ignore-existing --delete ~/tmp/A/ ~/tmp/B

% ls -la ~/tmp/B                                               
insgesamt 8
drwxrwxr-x 2 aboettger aboettger 4096 Mär 27 09:45 .
drwxrwxr-x 7 aboettger aboettger 4096 Mär 27 09:25 ..
-rw-rw-r-- 1 aboettger aboettger    0 Mär 27 09:35 123
-rw-rw-r-- 1 aboettger aboettger    0 Mär 27 09:42 456