Run bash and log its STDOUT/STDERR to systemd journal

logbash.sh

#!/usr/bin/env bash
# jakeev@
if [[ "${LOGBASH_ENABLE:-1}" -ne 0 ]]; then
    declare -r PROGNAME="${0##*/}"
    declare -r logid="${PROGNAME:-logbash}"
    # retain actual stdout/stderr descriptors
    exec {stderr}>&2
    exec {stdout}>&1
    # use systemd-cat to capture output
    exec {journal}> >(systemd-cat -t "$logid" --level-prefix=false)
    # wire up stdout/stderr to write to both stdout/stderr *AND* the journal.
    exec {logstdout}> >(tee "/proc/self/fd/$journal" >"/proc/self/fd/$stdout")
    exec {logstderr}> >(tee "/proc/self/fd/$journal" >"/proc/self/fd/$stderr")
    
    exec >&"$logstdout" 2>&"$logstderr"
fi

exec bash "$@"