Hello, for years have i been using a self-made backup script, that did mount a drive via USB, performed all kinds of plausibility checks, before actually backing up incrementally. Finally verifying success and logging the activities while kicking the ISB drive out.
Since a few months, i do have a real backup server instead, connecting to it via ssh i was able to have 2 terminals open and back up manually. Last time, i introduced a mistake by accident and since, i am trying to automate the whole thing once again, but that is difficult, as the load on the net is huge, mbuffer is useful in that regard. So i was intending to have just one script for all the operations using coproc to coordinate the 2 servers. But weird things are going on, i cant reliably communicate between host and backup server, at least not automatically. Searching the web, i found: https://github.com/reconquest/coproc.bash/blob/master/REFERENCE.md But i was unable to get this to work, which seems to indicate, that i am misunderstanding something. The only success i had was to "talk" to a chess engine in a coprocess, which did go well. But neither bash nor ssh are cooperating, i may have timing issues with the pipes or some other side effects. How can i describe? For example if i start this: > #!/bin/bash -e > > coproc { bash; } > exec 5<&${COPROC[0]} 6>&${COPROC[1]} > fd=5 > > echo "ls" >&6 > while IFS= read -ru $fd line > do > printf '%s\n' "$line" > done > > printf "%s\n" "sleep 3;exit" >&6 > while IFS= read -ru $fd line > do > printf '%s\n' "$line" > done > > exec 5<&- 6>&- > > wait > echo waited, done i get the output from ls, but then the thing is hanging indefinitely, apparently not reaching the exit line. :( Anyone who can share his experience to advance my experimenting? DdB
