#!/bin/sh -e
#
# sreget, Sat Oct 16 1999, Peter Csizmadia
#

prog=`basename $0`

if [ $# -lt 1 ]; then
	cat << EOF
$prog [login@]host:path [localfile]
examples:
  $prog cspeter@sunserv:log/access_log
  $prog sunserv:log/access_log sunserv.log
  $prog sunserv:log/access_log sunserv.log.gz
  $prog sunserv:log/access_log sunserv.log.bz2
EOF
	exit 0
fi

argn() { shift $1 ; echo $1 ; }

loginhost=""
path=""
setloginhostpath() {
	if [ $# = 2 ]; then
		h=`echo $2 | sed 's/:/ /'`
		host=`argn 1 $h`
		path=`argn 2 $h`
		loginhost="-l $1 $host"
	else
		h=`echo $1 | sed 's/:/ /'`
		loginhost=`argn 1 $h`
		path=`argn 2 $h`
	fi
}
setloginhostpath `echo $1 | sed 's/@/ /'`

if [ -z "$path" ]; then
	echo Remote file path not specified. >&2
	exit 1
fi

gzipped="n"
bzipped="n"
if [ $# -gt 1 ]; then
	localfile="$2"
	if [ -n "`echo $localfile | grep '\.gz$'`" ]; then
		if [ -z "`echo $path | grep '\.gz$'`" ]; then
			gzipped="y"
			echo -n "gunzipping: $localfile -> " >&2
			gunzip "$localfile"
			localfile=`echo $localfile | sed 's/\.gz$//'`
			echo $localfile >&2
		fi
	elif [ -n "`echo $localfile | grep '\.bz2'`" ]; then
		if [ -z "`echo $path | grep '\.bz2$'`" ]; then
			bzipped="y"
			echo -n "bunzipping: $localfile -> " >&2
			bunzip2 "$localfile"
			localfile=`echo $localfile | sed 's/\.bz2$//'`
			echo $localfile >&2
		fi
	fi
else
	localfile=`basename $path`
fi

blocksize=1024
skip=0
if [ -f "$localfile" ]; then
	localsize=`ls -l $localfile`
	if [ "$?" = "0" ]; then
		localsize=`argn 5 $localsize`
		if [ "$localsize" != "0" ]; then
			blocksize=$localsize
			skip=1
		fi
	fi
fi

ssh $loginhost "dd if=$path ibs=$blocksize skip=$skip | gzip -9"\
| gunzip >>$localfile

if [ "$gzipped" = "y" ]; then
	echo -n "gzipping: $localfile -> " >&2
	gzip -9 "$localfile"
	echo ${localfile}.gz >&2
fi
if [ "$bzipped" = "y" ]; then
	echo -n "bzipping: $localfile -> " >&2
	bzip2 "$localfile"
	echo ${localfile}.bz2 >&2
fi