bash : archive : add progress for extraction.

.linux/bash/module/archive.sh

@@ -144,15 +144,26 @@ unarchive()
     saved="${saved%%.*}"
     
     # calculate actual hash.
-    local actual=$(sha1sum "${target}" | cut -d\  -f1)
+    local actual=$(pv "${target}" | sha1sum | cut -d\  -f1)
 
     # extract if hash matched or show error if not.
     if [[ "${saved}" = "${actual}" ]]; then
-      echo "${status}: OK."
-      tar -xf "${target}"
+      echo "${status}: validation OK."
+      case "${target##*.}" in
+        "xz")
+          pv "${target}" | xz -d | tar -xf -
+          ;;
+        "gz")
+          pv "${target}" | gzip -d | tar -xf -
+          ;;
+      esac
     else
-      echo "${status}: failed."
+      echo "${status}: validation failed."
+      return 1
     fi
+
+    # report extraction complete.
+    echo "${status}: done."
   done
 }