#!/bin/bash
set -e

# ansible.builtin.script:
#   chdir: /root

# just in case one runs the script outside ansible
cd /root/

[[ ! -x `which curl` ]]         && echo error: curl executable not found && exit 1
[[ ! -x `which dpkg` ]]         && echo error: dpkg executable not found && exit 1
[[ ! -x `which gpg1` ]]         && echo error: gpg1 executable not found && exit 1
[[ ! -x `which lsb_release` ]]	&& echo error: lsb_release executable not found && exit 1

export DEBIAN_FRONTEND=noninteractive

echo -n checking /usr/share/keyrings/fluentbit.gpg ...
if [[ -f /usr/share/keyrings/fluentbit.gpg ]]; then
	echo already
else
	curl -s https://packages.fluentbit.io/fluentbit.key | gpg1 --dearmor > /usr/share/keyrings/fluentbit.gpg && echo done || echo FAIL
	changed=1
fi

distro=`lsb_release -cs 2>/dev/null`

if [[ $distro = bookworm || $distro = bullseye ]]; then
	base=debian
elif [[ $distro = jammy || $distro = focal ]]; then
        base=ubuntu
else
        echo error: $distro - unknown linux distribution codename - eventually update $0
        exit 1
fi

echo -n checking /etc/apt/sources.list.d/fluentbit.list ...
if [[ -f /etc/apt/sources.list.d/fluentbit.list ]]; then
	echo already
else
	cat > /etc/apt/sources.list.d/fluentbit.list <<EOF && echo done || echo FAIL
deb [signed-by=/usr/share/keyrings/fluentbit.gpg] https://packages.fluentbit.io/$base/$distro $distro main
EOF
	changed=1
fi

# we do not check for latest version right here
echo -n checking fluent-bit package ...
if dpkg -s fluent-bit >/dev/null 2>&1; then
	# ok=1 changed=0
	echo already
else
	echo -n update package cache ...
	apt-get -q -y update >/dev/null 2>&1 && echo done || echo FAIL

	# eventually failed=1
	apt-get -q -y install fluent-bit 2>&1 && echo done || echo FAIL
	changed=1

        systemctl enable fluent-bit --now
fi

[[ -z $changed ]] && echo nothing changed && exit 0

# ok=1 changed=1
echo changed - all done