tail-flowd

#!/usr/bin/env bash
#
#  Synopsis:
#	Tail (gnu) multiple schema/*/log/flowd-<Dow>.log files
#  Usage:
#	tail-flowd
#	tail-flowd .
#	tail-flowd jsonorg prefixio 
#  Note:
#	Only works up until midnight of local day.
#
#	Only works if schemas in dir $SETSPACE_ROOT/schema.
#

die()
{
	echo "ERROR: $@" >&2
	exit 1
}

test -n "$SETSPACE_ROOT" || die 'env var not defined: SETSPACE_ROOT'

SCHEMA=$SETSPACE_ROOT/schema

test -e $SCHEMA || die "directory does not exist: $SCHEMA"
START_DIR=$(pwd)
cd $SCHEMA || die "cd $SCHEMA failed: exit status=$?"

case $# in
0)
	DIRs=.
	DEPTH=1
	;;
1)
	#  special case when script started in schema dir
	if [ "$1" = . ];  then
		LOG=$START_DIR/log
		test -d $LOG || die "log dir does not exist: $LOG"
		LOG=$LOG/flowd-$(date +'%a').log
		exec tail -F $LOG
	fi
	;&	#  fall through
*)
	#  insure all schema directories exist
	for D in $@;  do
		test -d $D || die "no schema dir: $(pwd)/$D"
	done
	DIRs=$@
	DEPTH=0
esac

SCHEMAS=$(
	find $DIRs -mindepth $DEPTH -maxdepth $DEPTH -type d -print	|
	sort								|
	sed 's/^\.\///'
)

tail -f $(
	find $(find $SCHEMAS -mindepth 1 -maxdepth 1 -type d -name log )\
	-name flowd-$(date +'%a').log
)