servo: transmission: torrent-done: fix typos and add a TR_DEBUG option

hosts/by-name/servo/services/transmission/torrent-done

@@ -4,7 +4,9 @@
 # transmission invokes this with no args, and the following env vars:
 # - TR_TORRENT_DIR: full path to the folder i told transmission to download it to.
 #     e.g. /var/media/torrents/Videos/Film/Jason.Bourne-2016
-# optionally, perform a dry run by setting TR_DRY_RUN=1
+# optionally:
+# - TR_DRY_RUN=1
+# - TR_DEBUG=1
 
 DOWNLOAD_DIR=/var/media/torrents
 
@@ -15,6 +17,12 @@ destructive() {
     "$@"
   fi
 }
+debug() {
+  if [ -n "${TR_DEBUG-}" ]; then
+    echo "$@"
+  fi
+}
+
 if [[ "$TR_TORRENT_DIR" =~ ^.*freeleech.*$ ]]; then
   # freeleech torrents have no place in my permanent library
   echo "freeleech: nothing to do"
@@ -36,8 +44,10 @@ destructive find "$MEDIA_DIR" -type d -exec chmod g+rw,a+rx {} \;
 
 # if there's a single directory inside the media dir, then inline that
 subdirs=("$MEDIA_DIR"/*)
-if [ ${#subdirs} -eq 1 ]; then
+debug "top-level items in torrent dir:" "${subdirs[@]}"
+if [ ${#subdirs[@]} -eq 1 ]; then
   dirname="${subdirs[0]}"
+  debug "exactly one top-level item, checking if directory: $dirname"
   if [ -d "$dirname" ]; then
     destructive mv "$dirname"/* "$MEDIA_DIR/" && destructive rmdir "$dirname"
   fi
@@ -47,7 +57,7 @@ fi
 destructive find "$MEDIA_DIR/" -type f \(\
      -iname '.*downloaded.?from.*' \
   -o -iname 'source.txt' \
-  -o 'iname 'upcoming.?releases.*' \
+  -o -iname 'upcoming.?releases.*' \
   -o -iname 'www.YTS.*.jpg' \
   -o -iname 'WWW.YIFY*.COM.jpg' \
   -o -iname 'YIFY*.com.txt' \