76 lines
3.0 KiB
Bash
Executable File
76 lines
3.0 KiB
Bash
Executable File
#!/usr/bin/env bash
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set -Eeuo pipefail
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# This path can only be customized through arguments passed to the dockerd cli
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# at startup. Parsing the supervisor docker.conf file is cumbersome, and there
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# is little reason to allow users to customize this. Hence, we hardcode the path
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# here.
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#
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# See: https://docs.docker.com/engine/reference/commandline/dockerd/
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readonly dockerd_config_path=/etc/docker/daemon.json
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readonly dockerd_supervisor_config_path=/etc/supervisor/conf.d/dockerd.conf
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# Extend existing config...
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dockerd_config=$(! cat $dockerd_config_path 2>&-)
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# ...and fallback to an empty object if there is no existing configuration, or
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# otherwise the following `jq` merge commands would not produce anything.
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if [[ $dockerd_config == '' ]]; then
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dockerd_config='{}'
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fi
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readonly MTU=${MTU:-}
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if [[ $MTU ]]; then
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# We have to verify that this value is a valid integer because we are going to
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# start docker in the background and invalid values would never be surfaced.
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# Well, except that startup fails and our users are sent on a nice debugging
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# session.
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if [[ $MTU =~ ^[1-9][0-9]*$ ]]; then
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# See https://docs.docker.com/engine/security/rootless/
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sudo tee -a $dockerd_supervisor_config_path 1>&- <<<"environment=DOCKERD_ROOTLESS_ROOTLESSKIT_MTU=$MTU"
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dockerd_config=$(jq -S ".mtu = $MTU" <<<"$dockerd_config")
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else
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# shellcheck source=runner/logger.bash
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source logger.bash
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log.error "Docker MTU must be an integer, continuing bootstrapping without it, got: $MTU"
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MTU=
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fi
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fi
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if [[ ${DOCKER_REGISTRY_MIRROR:-} != '' ]]; then
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dockerd_config=$(jq -S --arg url "$DOCKER_REGISTRY_MIRROR" '."registry-mirrors" += ["$url"]' <<<"$dockerd_config")
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fi
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sudo mkdir -p ${dockerd_config_path%/*}
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sudo tee $dockerd_config_path 1>&- <<<"$dockerd_config"
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for config in $dockerd_config_path $dockerd_supervisor_config_path; do
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(
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echo "Using '$config' with the following content <<CONFIG"
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cat $config
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echo 'CONFIG'
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) 1>&2
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done
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sudo /usr/bin/supervisord -c /etc/supervicor/supervisord.conf
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if [[ $MTU ]]; then
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# It might take a few ticks for the `docker0` device to be up after starting
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# the docker daemon with supervisord, hence, we retry for a little while.
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# Notice how we use `nice` to execute the command with a least favorable
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# scheduling priority and are using a noop (`:`) instruction instead of
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# `sleep`. We do this to ensure that we keep the startup as fast as possible.
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if ! nice -n 19 timeout -k 70 60 -- bash -c "(until sudo ifconfig docker0 mtu '$MTU' up; do :; done) 1>&- 2>&-"; then
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# shellcheck source=runner/logger.bash
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source logger.bash
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log.error 'Failed to set docker interface mtu within 1 minute, continuing bootstrapping without it...'
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fi
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fi
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# We leave the wait for docker to come up to our entrypoint.sh script, since its
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# check properly handles the case where the docker service is in a crash loop.
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# Users still have the ability to disable the wait.
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export DOCKER_ENABLED=true
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export DISABLE_WAIT_FOR_DOCKER=${DISABLE_WAIT_FOR_DOCKER:-false}
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exec entrypoint.sh
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