fixup! Add tix-upgrade(8).

tix/tix-upgrade

@@ -185,24 +185,26 @@ fi
 
 if $upgrade_ports; then
   # Fetch each port from the mirror.
-  ports=$(LC_ALL=C ls -- "$collection/tix/tixinfo")
   # TODO: Handle new mandatory / recommended ports.
   # TODO: Handle renamed ports.
   mkdir -p "$cachedir/repository"
-  for port in $ports; do
+  ports=""
+  for port in $(LC_ALL=C ls -- "$collection/tix/tixinfo"); do
     # The port has a hash if if it exists upstream.
     sha256=$(tix-fetch $fetch_options \
                        --collection="$collection" \
                        --input-release-file="$cachedir/release.sh" \
                        --input-sha256sum="$cachedir/sha256sum" \
                        --sha256 --port -- $port)
-    # If the port exists upstream, get the latest version.
+    # If the port exists upstream, get the latest version and note its name down
+    # for the extraction step.
     if [ -n "$sha256" ]; then
       tix-fetch $fetch_options \
                 --collection="$collection" \
                 --input-release-file="$cachedir/release.sh" \
                 --input-sha256sum="$cachedir/sha256sum" \
                 -c --port -O "$cachedir/repository" -- $port
+      ports="$ports $port"
     fi
   done
 fi