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#!/bin/bash
set -e
# first arg is `-f` or `--some-option`
# or there are no args
if [ "$#" -eq 0 ] || [ "${1#-}" != "$1" ]; then
set -- cassandra -f "$@"
fi
# allow the container to be started with `--user`
if [ "$1" = 'cassandra' -a "$(id -u)" = '0' ]; then
find /var/lib/cassandra /var/log/cassandra "$CASSANDRA_CONFIG" \
\! -user cassandra -exec chown cassandra '{}' +
exec gosu cassandra "$0" "$@"
fi
_ip_address() {
# scrape the first non-localhost IP address of the container
# in Swarm Mode, we often get two IPs -- the container IP, and the (shared) VIP, and the container IP should always be first
ip address | awk '
$1 == "inet" && $NF != "lo" {
gsub(/\/.+$/, "", $2)
print $2
exit
}
'
}
# "sed -i", but without "mv" (which doesn't work on a bind-mounted file, for example)
_sed_in_place() {
local filename="$1"; shift
local tempFile
tempFile="$(mktemp)"
sed "$@" "$filename" > "$tempFile"
cat "$tempFile" > "$filename"
rm "$tempFile"
}
if [ "$1" = 'cassandra' ]; then
: ${CASSANDRA_RPC_ADDRESS='0.0.0.0'}
: ${CASSANDRA_LISTEN_ADDRESS='auto'}
if [ "$CASSANDRA_LISTEN_ADDRESS" = 'auto' ]; then
CASSANDRA_LISTEN_ADDRESS="$(_ip_address)"
fi
: ${CASSANDRA_BROADCAST_ADDRESS="$CASSANDRA_LISTEN_ADDRESS"}
if [ "$CASSANDRA_BROADCAST_ADDRESS" = 'auto' ]; then
CASSANDRA_BROADCAST_ADDRESS="$(_ip_address)"
fi
: ${CASSANDRA_BROADCAST_RPC_ADDRESS:=$CASSANDRA_BROADCAST_ADDRESS}
if [ -n "${CASSANDRA_NAME:+1}" ]; then
: ${CASSANDRA_SEEDS:="cassandra"}
fi
: ${CASSANDRA_SEEDS:="$CASSANDRA_BROADCAST_ADDRESS"}
_sed_in_place "$CASSANDRA_CONFIG/cassandra.yaml" \
-r 's/(- seeds:).*/\1 "'"$CASSANDRA_SEEDS"'"/'
for yaml in \
broadcast_address \
broadcast_rpc_address \
cluster_name \
endpoint_snitch \
listen_address \
num_tokens \
rpc_address \
start_rpc \
authenticator \
; do
var="CASSANDRA_$(echo $yaml | tr '[:lower:]' '[:upper:]')"
# eval presents no security issue here because of limited possible values of var
eval val=\$$var
if [ "$val" ]; then
_sed_in_place "$CASSANDRA_CONFIG/cassandra.yaml" \
-r 's/^(# )?('"$yaml"':).*/\2 '"$val"'/'
fi
done
for rackdc in dc rack; do
var="CASSANDRA_$(echo $rackdc | tr '[:lower:]' '[:upper:]')"
# eval presents no security issue here because of limited possible values of var
eval val=\$$var
if [ "$val" ]; then
_sed_in_place "$CASSANDRA_CONFIG/cassandra-rackdc.properties" \
-r 's/^('"$rackdc"'=).*/\1 '"$val"'/'
fi
done
fi
exec "$@"
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