prevent filter excluded files from being deleted

[Robin Lee Powell]

Read the "PER-DIRECTORY RULES AND DELETE" of the man page.  (And
don't feel bad, it took me a while to figure it out myself).

Short version: per-directory rules only apply on the side they're
*specified on*, but you need the exclusion to apply to *both* sides.

The following works, for the reasons specified there:

rlpowell at stodi> find a b -ls
703572129      0 drwxr-xr-x   2 rlpowell rlpowell       39 Mar  6 22:06 a
704372871      0 -rw-r--r--   1 rlpowell rlpowell        0 Mar  6 21:56 a/file
704372873      4 -rw-r--r--   1 rlpowell rlpowell       20 Mar  6 22:06 a/.rsync-filter
703572158      0 drwxr-xr-x   2 rlpowell rlpowell       39 Mar  6 22:06 b
704372870      0 -rw-r--r--   1 rlpowell rlpowell        0 Mar  6 22:06 b/file
704372881      4 -rw-r--r--   1 rlpowell rlpowell       20 Mar  6 22:06 b/.rsync-filter
rlpowell at stodi> cat a/.rsync-filter
+ .rsync-filter
- *
rlpowell at stodi> rsync -F --delete-after -iav a/ b/
building file list ... done

sent 102 bytes  received 11 bytes  226.00 bytes/sec
total size is 20  speedup is 0.18
rlpowell at stodi>

On Mon, Mar 06, 2023 at 10:04:52PM +0100, Heiko Schlittermann via rsync wrote:
> Hello,
> 
> given are 2 directories:
> 
>     a
>     ├── a-file
>     └── .rsync-filter
> 
>     b
>     └── a-file
> 
> I'd like to sync a/ -> b/, but I'd like to *exclude* all files. But I do
> not want to delete the excluded files. (The real scenario is a way more
> complex, the above is my reproducer.) 
> 
> and the following rsync command: `rsync -F --del a/ b/`
> Note, there is *no* `--delete-excluded`:
> 
>     $ rsync -F --del -inav a/ b/
>     sending incremental file list
>     *deleting   a-file
>     .d..t...... ./
> 
>     sent 62 bytes  received 29 bytes  182.00 bytes/sec
>     total size is 0  speedup is 0.00 (DRY RUN)
> 
> Why? Because it is excluded? Using the `--exclude` option does what I
> expect:
> 
>     $ rsync --exclude 'a-file' --del -inav a/ b/
>     sending incremental file list
>     .d..t...... ./
>     >f+++++++++ .rsync-filter
> 
>     sent 92 bytes  received 22 bytes  228.00 bytes/sec
>     total size is 4  speedup is 0.04 (DRY RUN)
> 
> even does what I expect:
> 
>     $ rsync --filter '- *' --del -inav a/ b/
>     sending incremental file list
>     .d..t...... ./
> 
>     sent 58 bytes  received 19 bytes  154.00 bytes/sec
>     total size is 0  speedup is 0.00 (DRY RUN)
> 
> Version:
> rsync  version 3.2.3  protocol version 31
> 
>     Best regards from Dresden/Germany
>     Viele Grüße aus Dresden
>     Heiko Schlittermann
> --
>  SCHLITTERMANN.de ---------------------------- internet & unix support -
>  Heiko Schlittermann, Dipl.-Ing. (TU) - {fon,fax}: +49.351.802998{1,3} -
>  gnupg encrypted messages are welcome --------------- key ID: F69376CE -



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