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k3s/install.sh

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#!/bin/sh
set -e
# Usage:
# curl ... | ENV_VAR=... sh -
# or
# ENV_VAR=... ./install.sh
#
# Example:
# Installing a server without traefik:
# curl ... | INSTALL_K3S_EXEC="--no-deploy=traefik" sh -
# Installing an agent to point at a server:
# curl ... | K3S_TOKEN=xxx K3S_URL=https://server-url:6443 sh -
#
# Environment variables:
# - K3S_*
# Environment variables which begin with K3S_ will be preserved for the
# systemd service to use. Setting K3S_URL without explicitly setting
# a systemd exec command will default the command to "agent", and we
# enforce that K3S_TOKEN or K3S_CLUSTER_SECRET is also set.
#
# - INSTALL_K3S_SKIP_DOWNLOAD
# If set to true will not download k3s hash or binary.
#
# - INSTALL_K3S_SYMLINK
# If set to 'skip' will not create symlinks, 'force' will overwrite,
# default will symlink if command does not exist in path.
#
# - INSTALL_K3S_SKIP_START
# If set to true will not start k3s service.
#
# - INSTALL_K3S_VERSION
# Version of k3s to download from github. Will attempt to download the
# latest version if not specified.
#
# - INSTALL_K3S_COMMIT
# Commit of k3s to download from temporary cloud storage.
# * (for developer & QA use)
#
# - INSTALL_K3S_BIN_DIR
# Directory to install k3s binary, links, and uninstall script to, or use
# /usr/local/bin as the default
#
# - INSTALL_K3S_BIN_DIR_READ_ONLY
# If set to true will not write files to INSTALL_K3S_BIN_DIR, forces
# setting INSTALL_K3S_SKIP_DOWNLOAD=true
#
# - INSTALL_K3S_SYSTEMD_DIR
# Directory to install systemd service and environment files to, or use
# /etc/systemd/system as the default
#
# - INSTALL_K3S_EXEC or script arguments
# Command with flags to use for launching k3s in the systemd service, if
# the command is not specified will default to "agent" if K3S_URL is set
# or "server" if not. The final systemd command resolves to a combination
# of EXEC and script args ($@).
#
# The following commands result in the same behavior:
# curl ... | INSTALL_K3S_EXEC="--no-deploy=traefik" sh -s -
# curl ... | INSTALL_K3S_EXEC="server --no-deploy=traefik" sh -s -
# curl ... | INSTALL_K3S_EXEC="server" sh -s - --no-deploy=traefik
# curl ... | sh -s - server --no-deploy=traefik
# curl ... | sh -s - --no-deploy=traefik
#
# - INSTALL_K3S_NAME
# Name of systemd service to create, will default from the k3s exec command
# if not specified. If specified the name will be prefixed with 'k3s-'.
#
# - INSTALL_K3S_TYPE
# Type of systemd service to create, will default from the k3s exec command
# if not specified.
GITHUB_URL=https://github.com/rancher/k3s/releases
STORAGE_URL=https://storage.googleapis.com/k3s-ci-builds
DOWNLOADER=
# --- helper functions for logs ---
info()
{
echo '[INFO] ' "$@"
}
fatal()
{
echo '[ERROR] ' "$@" >&2
exit 1
}
# --- fatal if no systemd or openrc ---
verify_system() {
if [ -x /sbin/openrc-run ]; then
HAS_OPENRC=true
return
fi
if [ -d /run/systemd ]; then
HAS_SYSTEMD=true
return
fi
fatal 'Can not find systemd or openrc to use as a process supervisor for k3s'
}
# --- add quotes to command arguments ---
quote() {
for arg in "$@"; do
printf '%s\n' "$arg" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/'/"
done
}
# --- add indentation and trailing slash to quoted args ---
quote_indent() {
printf ' \\\n'
for arg in "$@"; do
printf '\t%s \\\n' "$(quote "$arg")"
done
}
# --- escape most punctuation characters, except quotes, forward slash, and space ---
escape() {
printf '%s' "$@" | sed -e 's/\([][!#$%&()*;<=>?\_`{|}]\)/\\\1/g;'
}
# --- escape double quotes ---
escape_dq() {
printf '%s' "$@" | sed -e 's/"/\\"/g'
}
# --- define needed environment variables ---
setup_env() {
# --- use command args if passed or create default ---
case "$1" in
# --- if we only have flags discover if command should be server or agent ---
(-*|"")
if [ -z "${K3S_URL}" ]; then
CMD_K3S=server
else
if [ -z "${K3S_TOKEN}" ] && [ -z "${K3S_CLUSTER_SECRET}" ]; then
fatal "Defaulted k3s exec command to 'agent' because K3S_URL is defined, but K3S_TOKEN or K3S_CLUSTER_SECRET is not defined."
fi
CMD_K3S=agent
fi
;;
# --- command is provided ---
(*)
CMD_K3S=$1
shift
;;
esac
CMD_K3S_EXEC="${CMD_K3S}$(quote_indent "$@")"
# --- use systemd name if defined or create default ---
if [ -n "${INSTALL_K3S_NAME}" ]; then
SYSTEM_NAME=k3s-${INSTALL_K3S_NAME}
else
if [ "${CMD_K3S}" = server ]; then
SYSTEM_NAME=k3s
else
SYSTEM_NAME=k3s-${CMD_K3S}
fi
fi
# --- check for invalid characters in system name ---
valid_chars=$(printf '%s' "${SYSTEM_NAME}" | sed -e 's/[][!#$%&()*;<=>?\_`{|}/[:space:]]/^/g;' )
if [ "${SYSTEM_NAME}" != "${valid_chars}" ]; then
invalid_chars=$(printf '%s' "${valid_chars}" | sed -e 's/[^^]/ /g')
fatal "Invalid characters for system name:
${SYSTEM_NAME}
${invalid_chars}"
fi
# --- set related files from system name ---
SERVICE_K3S=${SYSTEM_NAME}.service
UNINSTALL_K3S_SH=${SYSTEM_NAME}-uninstall.sh
KILLALL_K3S_SH=k3s-killall.sh
# --- use sudo if we are not already root ---
SUDO=sudo
if [ $(id -u) -eq 0 ]; then
SUDO=
fi
# --- use systemd type if defined or create default ---
if [ -n "${INSTALL_K3S_TYPE}" ]; then
SYSTEMD_TYPE=${INSTALL_K3S_TYPE}
else
if [ "${CMD_K3S}" = server ]; then
SYSTEMD_TYPE=notify
else
SYSTEMD_TYPE=exec
fi
fi
# --- use binary install directory if defined or create default ---
if [ -n "${INSTALL_K3S_BIN_DIR}" ]; then
BIN_DIR=${INSTALL_K3S_BIN_DIR}
else
BIN_DIR=/usr/local/bin
fi
# --- use systemd directory if defined or create default ---
if [ -n "${INSTALL_K3S_SYSTEMD_DIR}" ]; then
SYSTEMD_DIR="${INSTALL_K3S_SYSTEMD_DIR}"
else
SYSTEMD_DIR=/etc/systemd/system
fi
# --- use service or environment location depending on systemd/openrc ---
if [ "${HAS_SYSTEMD}" = true ]; then
FILE_K3S_SERVICE=${SYSTEMD_DIR}/${SERVICE_K3S}
FILE_K3S_ENV=${SYSTEMD_DIR}/${SERVICE_K3S}.env
elif [ "${HAS_OPENRC}" = true ]; then
$SUDO mkdir -p /etc/rancher/k3s
FILE_K3S_SERVICE=/etc/init.d/${SYSTEM_NAME}
FILE_K3S_ENV=/etc/rancher/k3s/${SYSTEM_NAME}.env
fi
# --- get hash of config & exec for currently installed k3s ---
PRE_INSTALL_HASHES=$(get_installed_hashes)
# --- if bin directory is read only skip download ---
if [ "${INSTALL_K3S_BIN_DIR_READ_ONLY}" = true ]; then
INSTALL_K3S_SKIP_DOWNLOAD=true
fi
}
# --- check if skip download environment variable set ---
can_skip_download() {
if [ "${INSTALL_K3S_SKIP_DOWNLOAD}" != true ]; then
return 1
fi
}
# --- verify an executabe k3s binary is installed ---
verify_k3s_is_executable() {
if [ ! -x ${BIN_DIR}/k3s ]; then
fatal "Executable k3s binary not found at ${BIN_DIR}/k3s"
fi
}
# --- set arch and suffix, fatal if architecture not supported ---
setup_verify_arch() {
if [ -z "$ARCH" ]; then
ARCH=$(uname -m)
fi
case $ARCH in
amd64)
ARCH=amd64
SUFFIX=
;;
x86_64)
ARCH=amd64
SUFFIX=
;;
arm64)
ARCH=arm64
SUFFIX=-${ARCH}
;;
aarch64)
ARCH=arm64
SUFFIX=-${ARCH}
;;
arm*)
ARCH=arm
SUFFIX=-${ARCH}hf
;;
*)
fatal "Unsupported architecture $ARCH"
esac
}
# --- verify existence of network downloader executable ---
verify_downloader() {
# Return failure if it doesn't exist or is no executable
[ -x "$(which $1)" ] || return 1
# Set verified executable as our downloader program and return success
DOWNLOADER=$1
return 0
}
# --- verify existence of semanage when SELinux is enabled ---
verify_semanage() {
if [ -x "$(which getenforce)" ]; then
if [ "Disabled" != $(getenforce) ] && [ ! -x "$(which semanage)" ]; then
fatal 'SELinux is enabled but semanage is not found'
fi
fi
}
# --- create tempory directory and cleanup when done ---
setup_tmp() {
TMP_DIR=$(mktemp -d -t k3s-install.XXXXXXXXXX)
TMP_HASH=${TMP_DIR}/k3s.hash
TMP_BIN=${TMP_DIR}/k3s.bin
cleanup() {
code=$?
set +e
trap - EXIT
rm -rf ${TMP_DIR}
exit $code
}
trap cleanup INT EXIT
}
# --- use desired k3s version if defined or find latest ---
get_release_version() {
if [ -n "${INSTALL_K3S_COMMIT}" ]; then
VERSION_K3S="commit ${INSTALL_K3S_COMMIT}"
elif [ -n "${INSTALL_K3S_VERSION}" ]; then
VERSION_K3S=${INSTALL_K3S_VERSION}
else
info "Finding latest release"
case $DOWNLOADER in
curl)
VERSION_K3S=$(curl -w '%{url_effective}' -I -L -s -S ${GITHUB_URL}/latest -o /dev/null | sed -e 's|.*/||')
;;
wget)
VERSION_K3S=$(wget -SqO /dev/null ${GITHUB_URL}/latest 2>&1 | grep Location | sed -e 's|.*/||')
;;
*)
fatal "Incorrect downloader executable '$DOWNLOADER'"
;;
esac
fi
info "Using ${VERSION_K3S} as release"
}
# --- download from github url ---
download() {
[ $# -eq 2 ] || fatal 'download needs exactly 2 arguments'
case $DOWNLOADER in
curl)
curl -o $1 -sfL $2
;;
wget)
wget -qO $1 $2
;;
*)
fatal "Incorrect executable '$DOWNLOADER'"
;;
esac
# Abort if download command failed
[ $? -eq 0 ] || fatal 'Download failed'
}
# --- download hash from github url ---
download_hash() {
if [ -n "${INSTALL_K3S_COMMIT}" ]; then
HASH_URL=${STORAGE_URL}/k3s${SUFFIX}-${INSTALL_K3S_COMMIT}.sha256sum
else
HASH_URL=${GITHUB_URL}/download/${VERSION_K3S}/sha256sum-${ARCH}.txt
fi
info "Downloading hash ${HASH_URL}"
download ${TMP_HASH} ${HASH_URL}
HASH_EXPECTED=$(grep " k3s${SUFFIX}$" ${TMP_HASH})
HASH_EXPECTED=${HASH_EXPECTED%%[[:blank:]]*}
}
# --- check hash against installed version ---
installed_hash_matches() {
if [ -x ${BIN_DIR}/k3s ]; then
HASH_INSTALLED=$(sha256sum ${BIN_DIR}/k3s)
HASH_INSTALLED=${HASH_INSTALLED%%[[:blank:]]*}
if [ "${HASH_EXPECTED}" = "${HASH_INSTALLED}" ]; then
return
fi
fi
return 1
}
# --- download binary from github url ---
download_binary() {
if [ -n "${INSTALL_K3S_COMMIT}" ]; then
BIN_URL=${STORAGE_URL}/k3s${SUFFIX}-${INSTALL_K3S_COMMIT}
else
BIN_URL=${GITHUB_URL}/download/${VERSION_K3S}/k3s${SUFFIX}
fi
info "Downloading binary ${BIN_URL}"
download ${TMP_BIN} ${BIN_URL}
}
# --- verify downloaded binary hash ---
verify_binary() {
info "Verifying binary download"
HASH_BIN=$(sha256sum ${TMP_BIN})
HASH_BIN=${HASH_BIN%%[[:blank:]]*}
if [ "${HASH_EXPECTED}" != "${HASH_BIN}" ]; then
fatal "Download sha256 does not match ${HASH_EXPECTED}, got ${HASH_BIN}"
fi
}
# --- setup permissions and move binary to system directory ---
setup_binary() {
chmod 755 ${TMP_BIN}
info "Installing k3s to ${BIN_DIR}/k3s"
$SUDO chown root:root ${TMP_BIN}
$SUDO mv -f ${TMP_BIN} ${BIN_DIR}/k3s
if command -v getenforce > /dev/null 2>&1; then
if [ "Disabled" != $(getenforce) ]; then
info 'SELinux is enabled, setting permissions'
if ! $SUDO semanage fcontext -l | grep "${BIN_DIR}/k3s" > /dev/null 2>&1; then
$SUDO semanage fcontext -a -t bin_t "${BIN_DIR}/k3s"
fi
$SUDO restorecon -v ${BIN_DIR}/k3s > /dev/null
fi
fi
}
# --- download and verify k3s ---
download_and_verify() {
if can_skip_download; then
info 'Skipping k3s download and verify'
verify_k3s_is_executable
return
fi
setup_verify_arch
verify_downloader curl || verify_downloader wget || fatal 'Can not find curl or wget for downloading files'
verify_semanage
setup_tmp
get_release_version
download_hash
if installed_hash_matches; then
info 'Skipping binary downloaded, installed k3s matches hash'
return
fi
download_binary
verify_binary
setup_binary
}
# --- add additional utility links ---
create_symlinks() {
[ "${INSTALL_K3S_BIN_DIR_READ_ONLY}" = true ] && return
[ "${INSTALL_K3S_SYMLINK}" = skip ] && return
for cmd in kubectl crictl ctr; do
if [ ! -e ${BIN_DIR}/${cmd} ] || [ "${INSTALL_K3S_SYMLINK}" = force ]; then
which_cmd=$(which ${cmd} || true)
if [ -z "${which_cmd}" ] || [ "${INSTALL_K3S_SYMLINK}" = force ]; then
info "Creating ${BIN_DIR}/${cmd} symlink to k3s"
$SUDO ln -sf k3s ${BIN_DIR}/${cmd}
else
info "Skipping ${BIN_DIR}/${cmd} symlink to k3s, command exists in PATH at ${which_cmd}"
fi
else
info "Skipping ${BIN_DIR}/${cmd} symlink to k3s, already exists"
fi
done
}
# --- create killall script ---
create_killall() {
[ "${INSTALL_K3S_BIN_DIR_READ_ONLY}" = true ] && return
info "Creating killall script ${BIN_DIR}/${KILLALL_K3S_SH}"
$SUDO tee ${BIN_DIR}/${KILLALL_K3S_SH} >/dev/null << \EOF
#!/bin/sh
[ $(id -u) -eq 0 ] || exec sudo $0 $@
for bin in /var/lib/rancher/k3s/data/**/bin/; do
[ -d $bin ] && export PATH=$bin:$PATH
done
set -x
for service in /etc/systemd/system/k3s*.service; do
[ -s $service ] && systemctl stop $(basename $service)
done
for service in /etc/init.d/k3s*; do
[ -x $service ] && $service stop
done
pschildren() {
ps -e -o ppid= -o pid= | \
sed -e 's/^\s*//g; s/\s\s*/\t/g;' | \
grep -w "^$1" | \
cut -f2
}
pstree() {
for pid in $@; do
echo $pid
for child in $(pschildren $pid); do
pstree $child
done
done
}
killtree() {
kill -9 $(
{ set +x; } 2>/dev/null;
pstree $@;
set -x;
) 2>/dev/null
}
getshims() {
lsof | sed -e 's/^[^0-9]*//g; s/ */\t/g' | grep -w 'k3s/data/[^/]*/bin/containerd-shim' | cut -f1 | sort -n -u
}
killtree $({ set +x; } 2>/dev/null; getshims; set -x)
do_unmount() {
{ set +x; } 2>/dev/null
MOUNTS=
while read ignore mount ignore; do
MOUNTS="$mount\n$MOUNTS"
done </proc/self/mounts
MOUNTS=$(printf $MOUNTS | grep "^$1" | sort -r)
if [ -n "${MOUNTS}" ]; then
set -x
umount ${MOUNTS}
else
set -x
fi
}
do_unmount '/run/k3s'
do_unmount '/var/lib/rancher/k3s'
do_unmount '/var/lib/kubelet/pods'
do_unmount '/run/netns/cni-'
# Delete network interface(s) that match 'master cni0'
ip link show 2>/dev/null | grep 'master cni0' | while read ignore iface ignore; do
iface=${iface%%@*}
[ -z "$iface" ] || ip link delete $iface
done
ip link delete cni0
ip link delete flannel.1
rm -rf /var/lib/cni/
iptables-save | grep -v KUBE- | grep -v CNI- | iptables-restore
EOF
$SUDO chmod 755 ${BIN_DIR}/${KILLALL_K3S_SH}
$SUDO chown root:root ${BIN_DIR}/${KILLALL_K3S_SH}
}
# --- create uninstall script ---
create_uninstall() {
[ "${INSTALL_K3S_BIN_DIR_READ_ONLY}" = true ] && return
info "Creating uninstall script ${BIN_DIR}/${UNINSTALL_K3S_SH}"
$SUDO tee ${BIN_DIR}/${UNINSTALL_K3S_SH} >/dev/null << EOF
#!/bin/sh
set -x
[ \$(id -u) -eq 0 ] || exec sudo \$0 \$@
${BIN_DIR}/${KILLALL_K3S_SH}
if which systemctl; then
systemctl disable ${SYSTEM_NAME}
systemctl reset-failed ${SYSTEM_NAME}
systemctl daemon-reload
fi
if which rc-update; then
rc-update delete ${SYSTEM_NAME} default
fi
rm -f ${FILE_K3S_SERVICE}
rm -f ${FILE_K3S_ENV}
remove_uninstall() {
rm -f ${BIN_DIR}/${UNINSTALL_K3S_SH}
}
trap remove_uninstall EXIT
if (ls ${SYSTEMD_DIR}/k3s*.service || ls /etc/init.d/k3s*) >/dev/null 2>&1; then
set +x; echo 'Additional k3s services installed, skipping uninstall of k3s'; set -x
exit
fi
for cmd in kubectl crictl ctr; do
if [ -L ${BIN_DIR}/\$cmd ]; then
rm -f ${BIN_DIR}/\$cmd
fi
done
rm -rf /etc/rancher/k3s
rm -rf /var/lib/rancher/k3s
rm -rf /var/lib/kubelet
rm -f ${BIN_DIR}/k3s
rm -f ${BIN_DIR}/${KILLALL_K3S_SH}
EOF
$SUDO chmod 755 ${BIN_DIR}/${UNINSTALL_K3S_SH}
$SUDO chown root:root ${BIN_DIR}/${UNINSTALL_K3S_SH}
}
# --- disable current service if loaded --
systemd_disable() {
$SUDO rm -f /etc/systemd/system/${SERVICE_K3S} || true
$SUDO rm -f /etc/systemd/system/${SERVICE_K3S}.env || true
$SUDO systemctl disable ${SYSTEM_NAME} >/dev/null 2>&1 || true
}
# --- capture current env and create file containing k3s_ variables ---
create_env_file() {
info "env: Creating environment file ${FILE_K3S_ENV}"
UMASK=$(umask)
umask 0377
env | grep '^K3S_' | $SUDO tee ${FILE_K3S_ENV} >/dev/null
env | egrep -i '^(NO|HTTP|HTTPS)_PROXY' | $SUDO tee -a ${FILE_K3S_ENV} >/dev/null
umask $UMASK
}
# --- write systemd service file ---
create_systemd_service_file() {
info "systemd: Creating service file ${FILE_K3S_SERVICE}"
$SUDO tee ${FILE_K3S_SERVICE} >/dev/null << EOF
[Unit]
Description=Lightweight Kubernetes
Documentation=https://k3s.io
Wants=network-online.target
[Install]
WantedBy=multi-user.target
[Service]
Type=${SYSTEMD_TYPE}
EnvironmentFile=${FILE_K3S_ENV}
KillMode=process
Delegate=yes
LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity
TasksMax=infinity
TimeoutStartSec=0
Restart=always
RestartSec=5s
ExecStartPre=-/sbin/modprobe br_netfilter
ExecStartPre=-/sbin/modprobe overlay
ExecStart=${BIN_DIR}/k3s \\
${CMD_K3S_EXEC}
EOF
}
# --- write openrc service file ---
create_openrc_service_file() {
LOG_FILE=/var/log/${SYSTEM_NAME}.log
info "openrc: Creating service file ${FILE_K3S_SERVICE}"
$SUDO tee ${FILE_K3S_SERVICE} >/dev/null << EOF
#!/sbin/openrc-run
depend() {
after network-online
want cgroups
}
start_pre() {
rm -f /tmp/k3s.*
}
supervisor=supervise-daemon
name=${SYSTEM_NAME}
command="${BIN_DIR}/k3s"
command_args="$(escape_dq "${CMD_K3S_EXEC}")
>>${LOG_FILE} 2>&1"
output_log=${LOG_FILE}
error_log=${LOG_FILE}
pidfile="/var/run/${SYSTEM_NAME}.pid"
respawn_delay=5
set -o allexport
if [ -f /etc/environment ]; then source /etc/environment; fi
if [ -f ${FILE_K3S_ENV} ]; then source ${FILE_K3S_ENV}; fi
set +o allexport
EOF
$SUDO chmod 0755 ${FILE_K3S_SERVICE}
$SUDO tee /etc/logrotate.d/${SYSTEM_NAME} >/dev/null << EOF
${LOG_FILE} {
missingok
notifempty
copytruncate
}
EOF
}
# --- write systemd or openrc service file ---
create_service_file() {
[ "${HAS_SYSTEMD}" = true ] && create_systemd_service_file
[ "${HAS_OPENRC}" = true ] && create_openrc_service_file
return 0
}
# --- get hashes of the current k3s bin and service files
get_installed_hashes() {
$SUDO sha256sum ${BIN_DIR}/k3s ${FILE_K3S_SERVICE} ${FILE_K3S_ENV} 2>&1 || true
}
# --- enable and start systemd service ---
systemd_enable() {
info "systemd: Enabling ${SYSTEM_NAME} unit"
$SUDO systemctl enable ${FILE_K3S_SERVICE} >/dev/null
$SUDO systemctl daemon-reload >/dev/null
}
systemd_start() {
info "systemd: Starting ${SYSTEM_NAME}"
$SUDO systemctl restart ${SYSTEM_NAME}
}
# --- enable and start openrc service ---
openrc_enable() {
info "openrc: Enabling ${SYSTEM_NAME} service for default runlevel"
$SUDO rc-update add ${SYSTEM_NAME} default >/dev/null
}
openrc_start() {
info "openrc: Starting ${SYSTEM_NAME}"
$SUDO ${FILE_K3S_SERVICE} restart
}
# --- startup systemd or openrc service ---
service_enable_and_start() {
[ "${HAS_SYSTEMD}" = true ] && systemd_enable
[ "${HAS_OPENRC}" = true ] && openrc_enable
[ "${INSTALL_K3S_SKIP_START}" = true ] && return
POST_INSTALL_HASHES=$(get_installed_hashes)
if [ "${PRE_INSTALL_HASHES}" = "${POST_INSTALL_HASHES}" ]; then
info 'No change detected so skipping service start'
return
fi
[ "${HAS_SYSTEMD}" = true ] && systemd_start
[ "${HAS_OPENRC}" = true ] && openrc_start
return 0
}
# --- re-evaluate args to include env command ---
eval set -- $(escape "${INSTALL_K3S_EXEC}") $(quote "$@")
# --- run the install process --
{
verify_system
setup_env "$@"
download_and_verify
create_symlinks
create_killall
create_uninstall
systemd_disable
create_env_file
create_service_file
service_enable_and_start
}
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