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Allow child bashio processes to access the parent LOG_FD variable #174

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Allow child bashio processes to access the parent LOG_FD variable #174

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12 changes: 8 additions & 4 deletions lib/log.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -7,13 +7,17 @@
# to be included in add-on scripts to reduce code duplication across add-ons.
# ==============================================================================

# Unless $LOG_FD is already set to a valid fd
if ! [[ "${LOG_FD-}" =~ ^[0-9]+$ ]] || ! { : >&"${LOG_FD-2}"; } 2>/dev/null; then
# Unless $LOG_FD is already set to a valid fd.
if ! [[ "${LOG_FD:-}" =~ ^[0-9]+$ ]] || ! { : >&"${LOG_FD:-}"; } 2>/dev/null; then
# Preserve the original STDOUT on a free fd (stored in $LOG_FD) so that we can
# log to it without interfering with the STDOUT of subshells whose output we
# want to capture for other purposes.
# log to it without interfering with the STDOUT of subshells or child processes
# whose output we want to capture for other purposes.
exec {LOG_FD}>&1
fi
# Export LOG_FD for use by child bashio processes.
# This is done outside of the above conditional to ensure that LOG_FD is also
# exported if it was already set without using `export`.
export LOG_FD

# ------------------------------------------------------------------------------
# Log a message to output.
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