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discourse_docker/launcher

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#!/usr/bin/env bash
usage () {
echo "Usage: launcher COMMAND CONFIG [--skip-prereqs] [--docker-args STRING]"
echo "Commands:"
echo " start: Start/initialize a container"
echo " stop: Stop a running container"
echo " restart: Restart a container"
echo " destroy: Stop and remove a container"
echo " enter: Open a shell to run commands inside the container"
echo " logs: View the Docker logs for a container"
echo " bootstrap: Bootstrap a container for the config based on a template"
echo " run: Run the given command with the config in the context of the last bootstrapped image"
echo " rebuild: Rebuild a container (destroy old, bootstrap, start new)"
echo " cleanup: Remove all containers that have stopped for > 24 hours"
echo " start-cmd: Generate docker command used to start container"
echo
echo "Options:"
echo " --skip-prereqs Don't check launcher prerequisites"
echo " --docker-args Extra arguments to pass when running docker"
echo " --skip-mac-address Don't assign a mac address"
echo " --run-image Override the image used for running the container"
exit 1
}
# for potential re-exec later
SAVED_ARGV=("$@")
command=$1
config=$2
# user_args_argv is assigned once when the argument vector is parsed.
user_args_argv=""
# user_args is mutable: its value may change when templates are parsed.
# Superset of user_args_argv.
user_args=""
user_run_image=""
if [[ $command == "run" ]]; then
run_command=$3
fi
while [ ${#} -gt 0 ]; do
case "${1}" in
--debug)
DEBUG="1"
;;
--skip-prereqs)
SKIP_PREREQS="1"
;;
--skip-mac-address)
SKIP_MAC_ADDRESS="1"
;;
--docker-args)
user_args_argv="$2"
user_args="$user_args_argv"
shift
;;
--run-image)
user_run_image="$2"
shift
;;
esac
shift 1
done
if [ -z "$command" -o -z "$config" -a "$command" != "cleanup" ]; then
usage
fi
# Docker doesn't like uppercase characters, spaces or special characters, catch it now before we build everything out and then find out
re='[[:upper:]/ !@#$%^&*()+~`=]'
if [[ $config =~ $re ]];
then
echo
echo "ERROR: Config name '$config' must not contain upper case characters, spaces or special characters. Correct config name and rerun $0."
echo
exit 1
fi
cd "$(dirname "$0")"
pups_version='v1.0.3'
docker_min_version='17.03.1'
docker_rec_version='17.06.2'
git_min_version='1.8.0'
git_rec_version='1.8.0'
kernel_min_version='4.4.0'
config_file=containers/"$config".yml
cidbootstrap=cids/"$config"_bootstrap.cid
local_discourse=local_discourse
image="discourse/base:2.0.20231218-0429"
docker_path=`which docker.io 2> /dev/null || which docker`
git_path=`which git`
if [ "${SUPERVISED}" = "true" ]; then
restart_policy="--restart=no"
attach_on_start="-a"
attach_on_run="-a stdout -a stderr"
else
attach_on_run="-d"
fi
if [ -n "$DOCKER_HOST" ]; then
docker_ip=`sed -e 's/^tcp:\/\/\(.*\):.*$/\1/' <<< "$DOCKER_HOST"`
elif [ -x "$(which ip 2>/dev/null)" ]; then
docker_ip=`ip addr show docker0 | \
grep 'inet ' | \
awk '{ split($2,a,"/"); print a[1] }';`
else
docker_ip=`ifconfig | \
grep -B1 "inet addr" | \
awk '{ if ( $1 == "inet" ) { print $2 } else if ( $2 == "Link" ) { printf "%s:" ,$1 } }' | \
grep docker0 | \
awk -F: '{ print $3 }';`
fi
# From https://stackoverflow.com/a/44660519/702738
compare_version() {
if [[ $1 == $2 ]]; then
return 1
fi
local IFS=.
local i a=(${1%%[^0-9.]*}) b=(${2%%[^0-9.]*})
local arem=${1#${1%%[^0-9.]*}} brem=${2#${2%%[^0-9.]*}}
for ((i=0; i<${#a[@]} || i<${#b[@]}; i++)); do
if ((10#${a[i]:-0} < 10#${b[i]:-0})); then
return 1
elif ((10#${a[i]:-0} > 10#${b[i]:-0})); then
return 0
fi
done
if [ "$arem" '<' "$brem" ]; then
return 1
elif [ "$arem" '>' "$brem" ]; then
return 0
fi
return 1
}
fatal () {
echo -e "\n$1\n"
exit "${2:-1}"
}
install_docker() {
echo "Docker is not installed, you will need to install Docker in order to run Launcher"
echo "See https://docs.docker.com/installation/"
exit 1
}
pull_image() {
# Add a single retry to work around dockerhub TLS errors
$docker_path pull $image || $docker_path pull $image
}
check_prereqs() {
if [ -z $docker_path ]; then
install_docker
fi
# 1. docker daemon running?
# we send stderr to /dev/null cause we don't care about warnings,
# it usually complains about swap which does not matter
test=`$docker_path info 2> /dev/null`
if [[ $? -ne 0 ]] ; then
echo "Cannot connect to the docker daemon - verify it is running and you have access"
exit 1
fi
# 2. running an approved storage driver?
if ! $docker_path info 2> /dev/null | egrep -q 'Storage Driver: (btrfs|aufs|zfs|overlay2)$'; then
echo "Your Docker installation is not using a supported storage driver. If we were to proceed you may have a broken install."
echo "overlay2 is the recommended storage driver, although zfs and aufs may work as well."
echo "Other storage drivers are known to be problematic."
echo "You can tell what filesystem you are using by running \"docker info\" and looking at the 'Storage Driver' line."
echo
echo "If you wish to continue anyway using your existing unsupported storage driver,"
echo "read the source code of launcher and figure out how to bypass this check."
exit 1
fi
# 3. running recommended docker version
test=($($docker_path --version)) # Get docker version string
test=${test[2]//,/} # Get version alone and strip comma if exists
# At least minimum docker version
if compare_version "${docker_min_version}" "${test}"; then
echo "ERROR: Docker version ${test} not supported, please upgrade to at least ${docker_min_version}, or recommended ${docker_rec_version}"
exit 1
fi
# Recommend newer docker version
if compare_version "${docker_rec_version}" "${test}"; then
echo "WARNING: Docker version ${test} deprecated, recommend upgrade to ${docker_rec_version} or newer."
fi
arm=false
case $(uname -m) in
armv7l)
echo "ERROR: 32bit arm is not supported. Check if your hardware support arm64, which is supported in experimental capacity."
exit 1
;;
aarch64 | arm64)
echo "WARNING: Support for aarch64 is experimental at the moment. Please report any problems at https://meta.discourse.org/tag/arm"
image="discourse/base:aarch64"
arm=true
;;
x86_64)
echo "x86_64 arch detected."
;;
*)
echo "ERROR: unknown arch detected."
exit 1
;;
esac
# 4. discourse docker image is downloaded
test=`$docker_path images | awk '{print $1 ":" $2 }' | grep "$image"`
# arm experimental support is on a fixed tag, always pull
if [ -z "$test" ] || [ $arm = true ]; then
echo
echo "WARNING: We are about to start downloading the Discourse base image"
echo "This process may take anywhere between a few minutes to an hour, depending on your network speed"
echo
echo "Please be patient"
echo
pull_image
fi
# 5. running recommended git version
test=($($git_path --version)) # Get git version string
test=${test[2]//,/} # Get version alone and strip comma if exists
# At least minimum version
if compare_version "${git_min_version}" "${test}"; then
echo "ERROR: Git version ${test} not supported, please upgrade to at least ${git_min_version}, or recommended ${git_rec_version}"
exit 1
fi
# Recommend best version
if compare_version "${git_rec_version}" "${test}"; then
echo "WARNING: Git version ${test} deprecated, recommend upgrade to ${git_rec_version} or newer."
fi
# Check minimum kernel version due to https://bugs.ruby-lang.org/issues/13885
test=($(uname -r))
# At least minimum version
if compare_version "${kernel_min_version}" "${test}"; then
echo "ERROR: Kernel version ${test} not supported, please upgrade to at least ${kernel_min_version}"
exit 1
fi
# 6. able to attach stderr / out / tty
test=`$docker_path run $user_args -i --rm -a stdout -a stderr $image echo working`
if [[ "$test" =~ "working" ]] ; then : ; else
echo "Your Docker installation is not working correctly"
echo
echo "See: https://meta.discourse.org/t/docker-error-on-bootstrap/13657/18?u=sam"
exit 1
fi
# 7. enough space for the bootstrap on docker folder
folder=`$docker_path info --format '{{.DockerRootDir}}'`
safe_folder=${folder:-/var/lib/docker}
if [[ -d $safe_folder && $(stat -f --format="%a*%S" $safe_folder)/1024**3 -lt 5 ]] ; then
echo "You have less than 5GB of free space on the disk where $safe_folder is located. You will need more space to continue"
df -h $safe_folder
echo
if tty >/dev/null; then
read -p "Would you like to attempt to recover space by cleaning docker images and containers in the system? (y/N)" -n 1 -r
echo
if [[ $REPLY =~ ^[Yy]$ ]]
then
$docker_path container prune --force --filter until=24h >/dev/null
$docker_path image prune --all --force --filter until=24h >/dev/null
echo "If the cleanup was successful, you may try again now"
fi
fi
exit 1
fi
# 8. container definition file is accessible and is not insecure (world-readable)
if [[ ! -e "$config_file" || ! -r "$config_file" ]]; then
echo "ERROR: $config_file does not exist or is not readable."
echo
echo "Available configs ( `cd containers && ls -dm *.yml | tr -s '\n' ' ' | awk '{ gsub(/\.yml/, ""); print }'`)"
exit 1
elif [[ "$(find $config_file -perm -004)" ]]; then
echo "WARNING: $config_file file is world-readable. You can secure this file by running: chmod o-rwx $config_file"
fi
}
if [ -z "$SKIP_PREREQS" ] && [ "$command" != "cleanup" ]; then
check_prereqs
fi
set_volumes() {
volumes=`cat $config_file | $docker_path run $user_args --rm -i -a stdout -a stdin $image ruby -e \
"require 'yaml'; puts YAML.load(STDIN.readlines.join)['volumes'].map{|v| '-v ' << v['volume']['host'] << ':' << v['volume']['guest'] << ' '}.join"`
}
set_links() {
links=`cat $config_file | $docker_path run $user_args --rm -i -a stdout -a stdin $image ruby -e \
"require 'yaml'; puts YAML.load(STDIN.readlines.join)['links'].map{|l| '--link ' << l['link']['name'] << ':' << l['link']['alias'] << ' '}.join"`
}
find_templates() {
local templates=`cat $1 | $docker_path run $user_args --rm -i -a stdin -a stdout $image ruby -e \
"require 'yaml'; puts YAML.load(STDIN.readlines.join)['templates']"`
local arrTemplates=${templates// / }
if [ ! -z "$templates" ]; then
echo $templates
else
echo ""
fi
}
set_template_info() {
templates=$(find_templates $config_file)
arrTemplates=(${templates// / })
config_data=$(cat $config_file)
input="hack: true"
for template in "${arrTemplates[@]}"
do
[ ! -z $template ] && {
input="$input _FILE_SEPERATOR_ $(cat $template)"
}
done
# we always want our config file last so it takes priority
input="$input _FILE_SEPERATOR_ $config_data"
read -r -d '' env_ruby << 'RUBY'
require 'yaml'
input=STDIN.readlines.join
# default to UTF-8 for the dbs sake
env = {'LANG' => 'en_US.UTF-8'}
input.split('_FILE_SEPERATOR_').each do |yml|
yml.strip!
begin
env.merge!(YAML.load(yml)['env'] || {})
rescue Psych::SyntaxError => e
puts e
puts "*ERROR."
rescue => e
puts yml
p e
end
end
env.each{|k,v| puts "*ERROR." if v.is_a?(Hash)}
puts env.map{|k,v| "-e\n#{k}=#{v}" }.join("\n")
RUBY
tmp_input_file=$(mktemp)
echo "$input" > "$tmp_input_file"
raw=`exec cat "$tmp_input_file" | $docker_path run $user_args --rm -i -a stdin -a stdout $image ruby -e "$env_ruby"`
rm -f "$tmp_input_file"
env=()
ok=1
while read i; do
if [ "$i" == "*ERROR." ]; then
ok=0
elif [ -n "$i" ]; then
env[${#env[@]}]="${i//\{\{config\}\}/${config}}"
fi
done <<< "$raw"
if [ "$ok" -ne 1 ]; then
echo "${env[@]}"
echo "YAML syntax error. Please check your containers/*.yml config files."
exit 1
fi
# labels
read -r -d '' labels_ruby << 'RUBY'
require 'yaml'
input=STDIN.readlines.join
labels = {}
input.split('_FILE_SEPERATOR_').each do |yml|
yml.strip!
begin
labels.merge!(YAML.load(yml)['labels'] || {})
rescue Psych::SyntaxError => e
puts e
puts "*ERROR."
rescue => e
puts yml
p e
end
end
puts labels.map{|k,v| "-l\n#{k}=#{v}" }.join("\n")
RUBY
tmp_input_file=$(mktemp)
echo "$input" > "$tmp_input_file"
raw=`exec cat "$tmp_input_file" | $docker_path run $user_args --rm -i -a stdin -a stdout $image ruby -e "$labels_ruby"`
rm -f "$tmp_input_file"
labels=()
ok=1
while read i; do
if [ "$i" == "*ERROR." ]; then
ok=0
elif [ -n "$i" ]; then
labels[${#labels[@]}]=$(echo $i | sed s/{{config}}/${config}/g)
fi
done <<< "$raw"
if [ "$ok" -ne 1 ]; then
echo "${labels[@]}"
echo "YAML syntax error. Please check your containers/*.yml config files."
exit 1
fi
# expose
read -r -d '' ports_ruby << 'RUBY'
require 'yaml'
input=STDIN.readlines.join
ports = []
input.split('_FILE_SEPERATOR_').each do |yml|
yml.strip!
begin
ports += (YAML.load(yml)['expose'] || [])
rescue Psych::SyntaxError => e
puts e
puts "*ERROR."
rescue => e
puts yml
p e
end
end
puts ports.map { |p| p.to_s.include?(':') ? "-p\n#{p}" : "--expose\n#{p}" }.join("\n")
RUBY
tmp_input_file=$(mktemp)
echo "$input" > "$tmp_input_file"
raw=`exec cat "$tmp_input_file" | $docker_path run $user_args --rm -i -a stdin -a stdout $image ruby -e "$ports_ruby"`
rm -f "$tmp_input_file"
ports=()
ok=1
while read i; do
if [ "$i" == "*ERROR." ]; then
ok=0
elif [ -n "$i" ]; then
ports[${#ports[@]}]=$i
fi
done <<< "$raw"
if [ "$ok" -ne 1 ]; then
echo "${ports[@]}"
echo "YAML syntax error. Please check your containers/*.yml config files."
exit 1
fi
merge_user_args
}
if [ -z $docker_path ]; then
install_docker
fi
[ "$command" == "cleanup" ] && {
$docker_path container prune --filter until=1h
$docker_path image prune --all --filter until=1h
if [ -d /var/discourse/shared/standalone/postgres_data_old ]; then
echo
echo "Old PostgreSQL backup data cluster detected taking up $(du -hs /var/discourse/shared/standalone/postgres_data_old | awk '{print $1}') detected"
read -p "Would you like to remove it? (y/N): " -n 1 -r && echo
if [[ $REPLY =~ ^[Yy]$ ]]; then
echo "removing old PostgreSQL data cluster at /var/discourse/shared/standalone/postgres_data_old..."
rm -rf /var/discourse/shared/standalone/postgres_data_old*
else
exit 1
fi
fi
exit 0
}
docker_version=($($docker_path --version))
docker_version=${test[2]//,/}
restart_policy=${restart_policy:---restart=always}
set_existing_container(){
existing=`$docker_path ps -a | awk '{ print $1, $(NF) }' | grep " $config$" | awk '{ print $1 }'`
}
run_stop() {
set_existing_container
if [ ! -z $existing ]
then
(
set -x
$docker_path stop -t 600 $config
)
else
echo "$config was not started !"
echo "./discourse-doctor may help diagnose the problem."
exit 1
fi
}
set_run_image() {
run_image=`cat $config_file | $docker_path run $user_args --rm -i -a stdin -a stdout $image ruby -e \
"require 'yaml'; puts YAML.load(STDIN.readlines.join)['run_image']"`
if [ -n "$user_run_image" ]; then
run_image=$user_run_image
elif [ -z "$run_image" ]; then
run_image="$local_discourse/$config"
fi
}
set_boot_command() {
boot_command=`cat $config_file | $docker_path run $user_args --rm -i -a stdin -a stdout $image ruby -e \
"require 'yaml'; puts YAML.load(STDIN.readlines.join)['boot_command']"`
if [ -z "$boot_command" ]; then
no_boot_command=`cat $config_file | $docker_path run $user_args --rm -i -a stdin -a stdout $image ruby -e \
"require 'yaml'; puts YAML.load(STDIN.readlines.join)['no_boot_command']"`
if [ -z "$no_boot_command" ]; then
boot_command="/sbin/boot"
fi
fi
}
merge_user_args() {
local docker_args
docker_args=`cat $config_file | $docker_path run $user_args --rm -i -a stdout -a stdin $image ruby -e \
"require 'yaml'; puts YAML.load(STDIN.readlines.join)['docker_args']"`
if [[ -n "$docker_args" ]]; then
user_args="$user_args_argv $docker_args"
fi
}
run_start() {
if [ -z "$START_CMD_ONLY" ]
then
existing=`$docker_path ps | awk '{ print $1, $(NF) }' | grep " $config$" | awk '{ print $1 }'`
echo $existing
if [ ! -z $existing ]
then
echo "Nothing to do, your container has already started!"
exit 0
fi
existing=`$docker_path ps -a | awk '{ print $1, $(NF) }' | grep " $config$" | awk '{ print $1 }'`
if [ ! -z $existing ]
then
echo "starting up existing container"
(
set -x
$docker_path start $config
)
exit 0
fi
fi
set_template_info
set_volumes
set_links
set_run_image
set_boot_command
# get hostname and settings from container configuration
for envar in "${env[@]}"
do
if [[ $envar == DOCKER_USE_HOSTNAME* ]] || [[ $envar == DISCOURSE_HOSTNAME* ]]
then
# use as environment variable
eval $envar
fi
done
(
hostname=`hostname -s`
# overwrite hostname
if [ "$DOCKER_USE_HOSTNAME" = "true" ]
then
hostname=$DISCOURSE_HOSTNAME
else
hostname=$hostname-$config
fi
# we got to normalize so we only have allowed strings, this is more comprehensive but lets see how bash does first
# hostname=`$docker_path run $user_args --rm $image ruby -e 'print ARGV[0].gsub(/[^a-zA-Z-]/, "-")' $hostname`
# docker added more hostname rules
hostname=${hostname//_/-}
if [ -z "$SKIP_MAC_ADDRESS" ] ; then
mac_address="--mac-address $($docker_path run $user_args -i --rm -a stdout -a stderr $image /bin/sh -c "echo $hostname | md5sum | sed 's/^\(..\)\(..\)\(..\)\(..\)\(..\).*$/02:\1:\2:\3:\4:\5/'")"
fi
if [ ! -z "$START_CMD_ONLY" ] ; then
docker_path="true"
fi
set -x
$docker_path run --shm-size=512m $links $attach_on_run $restart_policy "${env[@]}" "${labels[@]}" -h "$hostname" \
-e DOCKER_HOST_IP="$docker_ip" --name $config -t "${ports[@]}" $volumes $mac_address $user_args \
$run_image $boot_command
)
exit 0
}
run_run() {
set_template_info
set_volumes
set_links
set_run_image
unset ERR
(exec $docker_path run --rm --shm-size=512m $user_args $links "${env[@]}" -e DOCKER_HOST_IP="$docker_ip" -i -a stdin -a stdout -a stderr $volumes $run_image \
/bin/bash -c "$run_command") || ERR=$?
if [[ $ERR > 0 ]]; then
exit 1
fi
}
run_bootstrap() {
set_template_info
base_image=`cat $config_file | $docker_path run $user_args --rm -i -a stdin -a stdout $image ruby -e \
"require 'yaml'; puts YAML.load(STDIN.readlines.join)['base_image']"`
update_pups=`cat $config_file | $docker_path run $user_args --rm -i -a stdin -a stdout $image ruby -e \
"require 'yaml'; puts YAML.load(STDIN.readlines.join)['update_pups']"`
if [[ ! X"" = X"$base_image" ]]; then
image=$base_image
fi
# the base_image may not always be discourse/base,
# let's ensure we always build from the latest
pull_image
set_volumes
set_links
if $docker_path run $user_args --rm -i $image gem which pups; then
pups_command="/usr/local/bin/pups --stdin"
else
# Fallback to git pull method here if `pups` was not installed by gem in base image
pups_command="cd /pups &&"
if [[ ! "false" = $update_pups ]]; then
pups_command="$pups_command git pull && git checkout $pups_version &&"
fi
pups_command="$pups_command /pups/bin/pups --stdin"
fi
echo $pups_command
declare -i BOOTSTRAP_EXITCODE
rm -f $cidbootstrap
echo "$input" | $docker_path run --shm-size=512m $user_args $links "${env[@]}" -e DOCKER_HOST_IP="$docker_ip" --cidfile "$cidbootstrap" -i -a stdin -a stdout -a stderr $volumes $image \
/bin/bash -c "$pups_command"
BOOTSTRAP_EXITCODE=$?
CONTAINER_ID=$(cat "$cidbootstrap")
rm -f "$cidbootstrap"
# magic exit code that indicates a retry
if [[ $BOOTSTRAP_EXITCODE -eq 77 ]]; then
$docker_path rm "$CONTAINER_ID"
exit 77
elif [[ $BOOTSTRAP_EXITCODE -gt 0 ]]; then
echo "bootstrap failed with exit code $BOOTSTRAP_EXITCODE"
echo "** FAILED TO BOOTSTRAP ** please scroll up and look for earlier error messages, there may be more than one."
echo "./discourse-doctor may help diagnose the problem."
if [[ -n "$DEBUG" ]]; then
if $docker_path commit "$CONTAINER_ID" $local_discourse/$config-debug; then
echo "** DEBUG ** Maintaining image for diagnostics $local_discourse/$config-debug"
else
echo "** DEBUG ** Failed to commit container $CONTAINER_ID for diagnostics"
fi
fi
$docker_path rm "$CONTAINER_ID"
exit 1
fi
sleep 5
$docker_path commit \
-c "LABEL org.opencontainers.image.created=\"$(TZ=UTC date -Iseconds)\"" \
"$CONTAINER_ID" \
$local_discourse/$config || fatal "FAILED TO COMMIT $CONTAINER_ID"
$docker_path rm "$CONTAINER_ID"
}
case "$command" in
bootstrap)
run_bootstrap
echo "Successfully bootstrapped, to startup use ./launcher start $config"
exit 0
;;
run)
run_run
exit 0
;;
enter)
exec $docker_path exec -it $config /bin/bash --login
;;
stop)
run_stop
exit 0
;;
logs)
$docker_path logs $config
exit 0
;;
restart)
run_stop
run_start
exit 0
;;
start-cmd)
START_CMD_ONLY="1"
run_start
exit 0;
;;
start)
run_start
exit 0
;;
rebuild)
if [ "$(git symbolic-ref --short HEAD)" == "master" ]; then
git branch -m master main
git fetch origin
git branch -u origin/main main
git remote set-head origin -a
fi
if [ "$(git symbolic-ref --short HEAD)" == "main" ]; then
echo "Ensuring launcher is up to date"
git remote update
LOCAL=$(git rev-parse HEAD)
REMOTE=$(git rev-parse @{u})
BASE=$(git merge-base HEAD @{u})
if [ $LOCAL = $REMOTE ]; then
echo "Launcher is up-to-date"
elif [ $LOCAL = $BASE ]; then
echo "Updating Launcher..."
git pull || (echo 'failed to update' && exit 1)
echo "Launcher updated, restarting..."
exec "$0" "${SAVED_ARGV[@]}"
elif [ $REMOTE = $BASE ]; then
echo "Your version of Launcher is ahead of origin"
else
echo "Launcher has diverged source, this is only expected in Dev mode"
fi
fi
set_existing_container
if [ ! -z $existing ]
then
echo "Stopping old container"
(
set -x
$docker_path stop -t 600 $config
)
fi
run_bootstrap
if [ ! -z $existing ]
then
echo "Removing old container"
(
set -x
$docker_path rm $config
)
fi
run_start
exit 0
;;
destroy)
(set -x; $docker_path stop -t 600 $config && $docker_path rm $config) || (echo "$config was not found" && exit 0)
exit 0
;;
esac
usage
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