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hget: do a HEAD request to check if the file is already complete (thanks miscief)

when we continue a download, make sure the file isnt already
complete, as otherwise the server might respond with a 416
as the range request will out of range.

--- a/rc/bin/hget

+++ b/rc/bin/hget

@@ -47,13 +47,24 @@

 	if(test -s $o)

 		s=`{ls -l $o | awk '{print $6}'}

 }

-if(! ~ $s 0)

-	r=($r 'Range: bytes='^$s^'-')

 <[3=0] <>/mnt/web/clone {

 	d=/mnt/web/^`{sed 1q}

 	if(~ $#b 1)

 		echo -n baseurl $b >[1=0]

 	echo -n url $1 >[1=0]

+	if(! ~ $s 0 && ~ $#p 0 && ~ $#P 0 && ~ $#m 0){

+		for(i in $r)

+			echo -n headers $i >[1=0]

+		echo -n request HEAD >[1=0]

+		<$d/body {

+			if(~ $s `{cat $d/contentlength >[2]/dev/null})       

+				exit ''

+		}

+		if(~ $#b 1)

+			echo -n baseurl $b >[1=0]

+		echo -n url $1 >[1=0]

+		r=($r 'Range: bytes='^$s^'-')

+	}

 	for(i in $r)

 		echo -n headers $i >[1=0]

 	if(~ $#m 1)

-- 

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