Rsync doesn't have a read-only mode. Rsyncd does but almost nobody uses
that. This person is specifically using rsync over ssh not rsyncd.
Yes, running as a user that can only read files is an excellent
solution. However, this is about full system backups which likely
contain files that only root can read. Sure, some --fake-super trickery
could be done but rrsync -ro is easier.
On 2026-04-09 10:29, G.W. Haywood via rsync wrote:
Hi there,
41;366;0c
On Thu, 9 Apr 2026, RolandK wrote:
...
...
wouldn't it be an interesting idea to have some feature/switch in
rsync, which can globally (on a per host basis) turn rsync
into "read-only" mode, i.e. which makes rsync binary drop any
capability of using write/modify/delete syscalls ?
...
...
1. Does the (default) "read only" module parameter not suffice?
2. Isn't the usual way to achieve the same global effect simply to run
the utlilty under a UID that has no write permissions?
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