fix external script for filenames with spaces from protocol

Fix the external special remotes git-annex-remote-ipfs,
git-annex-remote-torrent and the example.sh template to correctly support
filenames with spaces.

This commit was sponsored by John Peloquin on Patreon.

CHANGELOG

@@ -31,6 +31,9 @@ git-annex (6.20170521) UNRELEASED; urgency=medium
     the filename parameter to the TRANSFER command could not contain
     spaces. It can in fact contain spaces. Special remotes implementors
     that relied on that may need to fix bugs in their special remotes.
+  * Fix the external special remotes git-annex-remote-ipfs, 
+    git-annex-remote-torrent and the example.sh template to correctly
+    support filenames with spaces.
 
  -- Joey Hess <id@joeyh.name>  Sat, 17 Jun 2017 13:02:24 -0400
 

doc/special_remotes/external/example.sh

@@ -122,9 +122,11 @@ while read line; do
 			fi
 		;;
 		TRANSFER)
+			op="$2"
 			key="$3"
-			file="$4"
-			case "$2" in
+			shift 3
+			file="$@"
+			case "$op" in
 				STORE)
 					# Store the file to a location
 					# based on the key.

doc/special_remotes/external/git-annex-remote-ipfs

@@ -81,9 +81,11 @@ while read line; do
 			echo CHECKURL-CONTENTS UNKNOWN "$(urltoaddress "$url")"
 		;;
 		TRANSFER)
+			op="$2"
 			key="$3"
-			file="$4"
-			case "$2" in
+			shift 3
+			file="$@"
+			case "$op" in
 				STORE)
 					addr=$(ipfs add -q "$file" </dev/null) || true
 					if [ -z "$addr" ]; then

doc/special_remotes/external/git-annex-remote-torrent

@@ -149,9 +149,11 @@ while read line; do
 			rm -f "$tmp"
 		;;
 		TRANSFER)
+			op="$2"
 			key="$3"
-			file="$4"
-			case "$2" in
+			shift 3
+			file="$@"
+			case "$op" in
 				STORE)
 					echo TRANSFER-FAILURE STORE "$key" "upload not supported"
 				;;