fd-progress

#!/bin/bash

USAGE="$0 PID FD
A progress bar for a running process's position through a file.
The file must have a known size.

Env vars:
INTERVAL: Modify the refresh interval.
BANNER: Alternate program for percentage display (default 'banner')
"

if [ "$#" -lt 1 ]; then
	echo "USAGE: $USAGE"
	exit 1
fi

INTERVAL=${INTERVAL:-0.5}
BANNER=${BANNER:-banner}

PID="$1"
FD="$2"

while sleep "$INTERVAL"; do
	if ! [ -d "/proc/$PID" ]; then
		clear
		echo "Process complete."
		exit 1
	fi

	file="$(readlink "/proc/$PID/fd/$FD")"
	if [ ! "$file" ]; then
		clear
		echo "File closed."
		exit 1
	fi
	if [ "$file" != "$oldfile" ]; then
		if [ -b "$file" ]; then
			totalsize="$(blockdev --getsize64 "$file")"
		elif [ -f "$file" ]; then
			totalsize="$(stat -c %s "$file")"
		else
			clear
			echo "Could not determine size of file: $file"
			exit 1
		fi
	fi
	oldfile="$file"
	position="$(grep pos "/proc/$PID/fdinfo/$FD"| cut -f2)"
	complete=$(python -c "print '%.2f' % ($position * 100. / $totalsize)")
	clear
	echo
	echo "$file"
	echo
	$BANNER "$complete%"
done