Re: Can rsync write to a FIFO?
Yeah, I was thinking tar, but it's effectively the same thing. On Sat, Feb 11, 2023 at 07:14:57PM +0100, Hardy via rsync wrote: > If this helps, in old days I used to use cpio for a similar thing. > > I do not want to spam you with my whole script, but willing to share if you > want. I think you will get the hang of it by the following snippet. (Get > yourself man-knowledge about the -i -o -p mechanism of cpio and the use of > dd.) This was in the good (?) old days when rsh worked as simple (and > insecure) as this. In modern *n*x like systems rsh is a link to ssh, which is > (besides being entirely wrong!) a pitfall to finding correct cli arguments. > But it is manageable if you are aware of it. > > CPIOP = parameter arguments to cpio > /tmp/$$.f = list of files > > Snippet: > > case $CPIOP in > -i*) rsh -l $RUSER $RHOST dd if=$RDEV | cpio $CPIOP > ;; > -o*) > cpio $CPIOP ;; > -p) > cpio -ocv ;; > *) echo argument mismatch $CPIOP >&2 > exit > ;; > esac > > Hope this gives an idea > > Hardy > > Am 10.02.23 um 10:31 schrieb Chris Green via rsync: > > I have searched a little and read the man page but I can't really find > > a good definite answer to this. > > > > Can rsync write to a FIFO? Obviously one needs the --inplace to do > > this, does one also need --write-devices? > > > > It would be very handy if one can do this, to use as a simple message > > passing mechanism. Write something to a file on system A and rsync it > > to a FIFO on system B where there is a simple script reading the FIFO. > > The script gets the contents of the file every time it's written. > > > > (this is all within a LAN behind a reasonably secure firewall) > > > > -- > Please use reply-all for most replies to avoid omitting the mailing list. > To unsubscribe or change options: > https://lists.samba.org/mailman/listinfo/rsync > Before posting, read: http://www.catb.org/~esr/faqs/smart-questions.html -- Please use reply-all for most replies to avoid omitting the mailing list. To unsubscribe or change options: https://lists.samba.org/mailman/listinfo/rsync Before posting, read: http://www.catb.org/~esr/faqs/smart-questions.html
Re: Can rsync write to a FIFO?
If this helps, in old days I used to use cpio for a similar thing. I do not want to spam you with my whole script, but willing to share if you want. I think you will get the hang of it by the following snippet. (Get yourself man-knowledge about the -i -o -p mechanism of cpio and the use of dd.) This was in the good (?) old days when rsh worked as simple (and insecure) as this. In modern *n*x like systems rsh is a link to ssh, which is (besides being entirely wrong!) a pitfall to finding correct cli arguments. But it is manageable if you are aware of it. CPIOP = parameter arguments to cpio /tmp/$$.f = list of files Snippet: case $CPIOP in -i*) rsh -l $RUSER $RHOST dd if=$RDEV | cpio $CPIOP ;; -o*) cpio $CPIOP &2 exit ;; esac Hope this gives an idea Hardy Am 10.02.23 um 10:31 schrieb Chris Green via rsync: I have searched a little and read the man page but I can't really find a good definite answer to this. Can rsync write to a FIFO? Obviously one needs the --inplace to do this, does one also need --write-devices? It would be very handy if one can do this, to use as a simple message passing mechanism. Write something to a file on system A and rsync it to a FIFO on system B where there is a simple script reading the FIFO. The script gets the contents of the file every time it's written. (this is all within a LAN behind a reasonably secure firewall) -- Please use reply-all for most replies to avoid omitting the mailing list. To unsubscribe or change options: https://lists.samba.org/mailman/listinfo/rsync Before posting, read: http://www.catb.org/~esr/faqs/smart-questions.html
Re: Can rsync write to a FIFO?
Chris Green via rsync (Fr 10 Feb 2023 10:31:15 CET): > Can rsync write to a FIFO? Obviously one needs the --inplace to do > this, does one also need --write-devices? I think, there is no point in using rsync, as there is nothing to compare against on the remote side (and I've doubts if rsync will be happy with a "file" that isn't seekable.) As rsync uses SSH nowadays, I'd do something like scp LOCAL-FILE remote-host:FIFO But, I'm not sure if scp is happy with a FIFO on the remote end. A fallback could be ssh remote-host 'cat >FIFO' signature.asc Description: PGP signature -- Please use reply-all for most replies to avoid omitting the mailing list. To unsubscribe or change options: https://lists.samba.org/mailman/listinfo/rsync Before posting, read: http://www.catb.org/~esr/faqs/smart-questions.html
