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[DOCKER] fix randomString for macOS compatibility #1864

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[DOCKER] fix randomString for macOS compatibility #1864

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7 changes: 5 additions & 2 deletions docker/docker_build_common.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -56,9 +56,12 @@ function generateControllerPort() {
fi
}

# don't change the length as it is expected 16 bytes of a base64-encoded UUID
# Kafka cluster ID is a 22-char URL-safe base64-encoded UUID (16 bytes encoded = 22 chars)
# KIP-78 specifies allowed chars are [a-zA-Z0-9_\-]+
# https://cwiki.apache.org/confluence/display/KAFKA/KIP-78:+Cluster+Id
# tr '+/' '-_' converts standard base64 to URL-safe base64 for Kafka compatibility
function randomString() {
echo $(cat /dev/random | env LC_CTYPE=C tr -dc 'a-zA-Z0-9' | fold -w 22 | head -n 1)
head -c 16 /dev/urandom | base64 | tr '+/' '-_' | tr -d '=' | head -c 22
}

function checkDocker() {
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