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#!/bin/busybox sh
if [ $# -ne 1 ]
then cat <<EOT
Usage: $(basename $0) <sink-dir>
Concatenate then delete files as soon they appear in sink-dir to stdout.
If multiple files are found in sink, the first in alphabetical order is choosen.
<sink-dir> must not exists, this program must create it (avoiding mistakes).
Dropping an empty file in dir-sink will clean exit this program.
EOT
exit 1
fi
SINKDIR=$1
mkdir "$SINKDIR" && cd "$SINKDIR"
if [ $? -ne 0 ]
then echo "Cannot mkdir/chdir to '$SINKDIR'" >&2
exit 2
fi
while true
do
f=$(ls | head -n1)
if [ -n "$f" ]
then if [ -f "$f" -a -r "$f" ]
then size=$(stat -c'%s' -- "$f")
# Do the actual work on the following line
cat -- "$f" && rm -v -- "$f" >&2
# Normal exit condition
if [ $size -eq 0 ]
then cd / && rmdir -v -- "$SINKDIR" >&2
exit 0
fi
else echo "'$SINKDIR/$f' is not a readable file" >&2
exit 3
fi
fi
sleep 1
done
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