calpine-docker/docker-entrypoint.sh

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#!/bin/sh
set -eu
# first arg is `-f` or `--some-option`
if [ "${1#-}" != "$1" ]; then
set -- docker "$@"
fi
# if our command is a valid Docker subcommand, let's invoke it through Docker instead
# (this allows for "docker run docker ps", etc)
if docker help "$1" > /dev/null 2>&1; then
set -- docker "$@"
fi
_should_tls() {
[ -n "${DOCKER_TLS_CERTDIR:-}" ] \
&& [ -s "$DOCKER_TLS_CERTDIR/client/ca.pem" ] \
&& [ -s "$DOCKER_TLS_CERTDIR/client/cert.pem" ] \
&& [ -s "$DOCKER_TLS_CERTDIR/client/key.pem" ]
}
# if we have no DOCKER_HOST but we do have the default Unix socket (standard or rootless), use it explicitly
if [ -z "${DOCKER_HOST:-}" ] && [ -S /var/run/docker.sock ]; then
export DOCKER_HOST=unix:///var/run/docker.sock
elif [ -z "${DOCKER_HOST:-}" ] && XDG_RUNTIME_DIR="${XDG_RUNTIME_DIR:-/run/user/$(id -u)}" && [ -S "$XDG_RUNTIME_DIR/docker.sock" ]; then
export DOCKER_HOST="unix://$XDG_RUNTIME_DIR/docker.sock"
fi
# if DOCKER_HOST isn't set (no custom setting, no default socket), let's set it to a sane remote value
if [ -z "${DOCKER_HOST:-}" ]; then
if _should_tls || [ -n "${DOCKER_TLS_VERIFY:-}" ]; then
export DOCKER_HOST='tcp://docker:2376'
else
export DOCKER_HOST='tcp://docker:2375'
fi
fi
if [ "${DOCKER_HOST#tcp:}" != "$DOCKER_HOST" ] \
&& [ -z "${DOCKER_TLS_VERIFY:-}" ] \
&& [ -z "${DOCKER_CERT_PATH:-}" ] \
&& _should_tls \
; then
export DOCKER_TLS_VERIFY=1
export DOCKER_CERT_PATH="$DOCKER_TLS_CERTDIR/client"
fi
if [ "$1" = 'dockerd' ]; then
cat >&2 <<-'EOW'
📎 Hey there! It looks like you're trying to run a Docker daemon.
You probably should use the "dind" image variant instead, something like:
docker run --privileged --name some-docker ... docker:dind ...
See https://hub.docker.com/_/docker/ for more documentation and usage examples.
EOW
sleep 3
fi
exec "$@"