traefik/script/update-cert.sh

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#!/bin/sh
set -e
CERT_IMAGE="alpine:edge"
# cd to the current directory so the script can be run from anywhere.
SCRIPT_DIR="$( cd "$( dirname "${0}" )" && pwd -P)"; export SCRIPT_DIR
cd "${SCRIPT_DIR}"
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# Update the cert image.
docker pull $CERT_IMAGE
# Fetch the latest certificates.
ID=$(docker run -d $CERT_IMAGE sh -c "apk --update upgrade && apk add ca-certificates && update-ca-certificates")
docker logs -f "${ID}"
docker wait "${ID}"
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# Update the local certificates.
docker cp "${ID}":/etc/ssl/certs/ca-certificates.crt "${SCRIPT_DIR}"
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# Cleanup.
docker rm -f "${ID}"