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#!/command/execlineb -P
# Get the local country code as well as a few other codes
# for countries all around the world.
pipeline
{
s6-setuidgid nobody
foreground
{
s6-envdir /etc/s6-linux-init/env-stage2
importas -u COUNTRY_CODE COUNTRY_CODE
s6-echo ${COUNTRY_CODE}
}
forx CODE { uk de ru cn kr jp us ca br au il za }
importas -u CODE CODE
s6-echo ${CODE}
}
# Suppress duplicates (e.g. if the local country code is in the list).
pipeline
{
s6-setuidgid nobody
s6-sort -u
}
# Get the IP addresses for some NTP servers in those countries.
# Limit the DNS queries to 30 seconds: if the DNS is slower than
# that, chances are the server isn't good for us anyway.
# All the queries are parallelized, so it's fast.
pipeline
{
s6-setuidgid nobody
forstdin -p -d"\n" CODE
importas -u CODE CODE
forx -p I { 0 1 }
importas -u I I
redirfd -w 2 /dev/null
s6-dnsip4 -t 30000 -- ${I}.${CODE}.pool.ntp.org
}
# Ask for a NTP exchange with the servers we get. Accept anything.
# If the exchange can't be completed in 5 seconds, kill it.
# All the queries are parallelized.
pipeline
{
s6-setuidgid ntp
forstdin -p -d"\n" NTPSERVERIP
importas -u NTPSERVERIP NTPSERVERIP
redirfd -w 2 /dev/null
s6-sntpclock -f -T 5000 ${NTPSERVERIP}
}
# Take the first answer we get.
pipeline
{
s6-setuidgid nobody
s6-head -Sc 12
}
# Update the system clock. Accept anything.
s6-clockadd -f
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