[Linux-disciples] SSH: Testing whether ID is already in authorized_keys

[Adam Rosi-Kessel]

You could copy it over, grep the authorized_keys for the file, and only
add it if it's not in there. I think any solution to this problem is
going to be some sort of hack.

On Sat, Sep 03, 2005 at 04:44:31PM -0400, Stephen R Laniel wrote:
> I'm writing a script to do rsync backups, and before I do
> the backup I'd like to copy the local user's SSH public key
> into his remote ~/.ssh/authorized_keys file -- unless the
> key is *already* in that file. The normal trick to do this
> is to use
> 
> ssh-copy-id -i ~/.ssh/id_dsa.pub user at host.com
> 
> However, I've just noticed that ssh-copy-id doesn't check
> whether the key is already in there. Is there any easy,
> elegant way (as easy and elegant as ssh-copy-id) to only
> copy the key over if it's not already in the remote
> authorized_keys file?
> 
> I guess one hackish way around this would be to do
> 
> TEMPFILE=$(mktemp)
> AUTHKEYSFILE=~/.ssh/authorized_keys
> sort $AUTHKEYSFILE |uniq > $TEMPFILE
> mv $TEMPFILE $AUTHKEYSFILE
> 
> which would eliminate any duplicate lines from the
> authorized_keys file. But that seems like a hack. Does
> anyone know of a cleaner way?
-- 
Adam Rosi-Kessel
http://adam.rosi-kessel.org
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