fixed binary name recognition and archive location

posix/payload

@@ -1,4 +1,4 @@
-#!/bin/sh -e
+#!/bin/sh -ex
 
 # TODO: extract self without resolving to $0 because it doesn't resolve links
 
@@ -12,15 +12,53 @@ if ! [ -d "$destdir" ]; then
 	mkdir -p "$destdir"
 fi
 
+
+# If the file does not contain the .tin extension it was either renamed or
+# linked somewhere, so if it was called as $ <exe> then try to find it in the
+# current directory else try to find it in path. When found evaluate if it is
+# a link, if it is traverse it and then set the archive variable
+# TODO: for each match check if the file si really a tarinstall with a header
+
+archive="$0"
+if ! echo "$archive" | grep -q \.tin$; then
+	if [ "$(dirname "$archive")" = '.' ]; then
+		if [ -e "$archive" ]; then
+			if [ -L "$archive" ]; then
+				archive="$(readlink "$0")"
+			fi
+		else
+			: > "$destdir"/paths
+			( IFS=:
+			for p in $PATH; do
+				find -L "$p" -name "$archive" >> "$destdir"/paths
+			done
+			)
+			while read -r l; do
+				if [ -L "$l" ]; then
+					archive="$(readlink "$l")"
+					break
+				elif [ -x "$l" ]; then
+					archive="$l"
+					break
+				fi
+			done < "$destdir"/paths
+		fi
+	fi
+fi
+
 if ! [ "$(head -n 1 "$destdir"/ID/checksum 2>/dev/null)" = 'SUM' ]; then
 	rm -rf "$destdir"/ID
 	tail -c +BYTES "$0" | lz4 -dc | tar -x -C "$destdir"
 	echo "SUM" > "$destdir"/ID/checksum
 fi
 
-binname="$(basename "$0")"
-if echo "$binname" | grep -q \.tin$; then
-	binname="$(echo "$binname" | sed s/\.tin//)"
+if [ "$(find "$destdir"/ID/bin -maxdepth 1 -type f | wc -l)" = '1' ]; then
+	binname="$(find "$destdir"/ID/bin -maxdepth 1 -type f)"
+else
+	binname="$(basename "$0")"
+	if echo "$binname" | grep -q \.tin$; then
+		binname="$destdir"/ID/bin/"$(echo "$binname" | sed s/\.tin//)"
+	fi
 fi
 
 ORIGIN="$destdir"/ID
@@ -32,4 +70,4 @@ export PATH
 
 # export LD_DEBUG='libs'
 
-exec "$destdir"/ID/bin/"$binname" "$@"
+exec "$binname" "$@"