docker/mod/core/prefix-log
2020-05-14 19:07:23 +02:00

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#!/usr/bin/env bash
# setup fd-3 to point to the original stdout
exec 3>&1
# setup fd-4 to point to the original stderr
exec 4>&2
# get the prefix from SUPERVISOR_PROCESS_NAME environement variable
printf -v PREFIX "%-14.14s" ${SUPERVISOR_PROCESS_NAME}
# reassign stdout and stderr to a preprocessed and redirected to the original stdout/stderr (3 and 4) we have create eralier
exec 1> >( perl -ne '$| = 1; print "'"${PREFIX}"' | $_"' >&3)
exec 2> >( perl -ne '$| = 1; print "'"${PREFIX}"' | $_"' >&4)
# from here on everthing that outputs to stdout/stderr will be go through the perl script
exec "$@"