Small golang utility I've produced to block until a host is pingable.
Designed to be used in expressions such as waitfor 192.168.1.2 60 && /bin/dosomething
Usage: waitfor <ip_addr> <timeout_secs>
It sends one ping in a loop until either a response is received, or timeout_secs seconds have elapsed with no response.
It ends with an exit code 0 if a response was received, otherwise exit code 1.
After deploying the binary to a suitable directory like /usr/local/bin, ensure the permissions are correct.
Example : sudo chmod u=rwx,go=rx /usr/local/bin/waitfor
Also as root, use setcap to allow the binary to use raw sockets so that it can send and receive ICMP packets.
Example : sudo setcap cap_net_raw=+ep /usr/local/bin/waitfor