Avoided a confusing error message from iso_image_update_sizes(),

prepared macro for non-confusing error message,
and introduced flag bit0 to iso_stream_get_input_stream()

libisofs/image.c

@@ -392,6 +392,14 @@ static
 int dir_update_size(IsoImage *image, IsoDir *dir)
 {
     IsoNode *pos;
+
+#ifdef Libisofs_update_sizes_abortablE
+    char *path= NULL;
+    IsoStream *base_stream;
+    int cancel_ret, ret;
+    uint32_t lba;
+#endif
+
     pos = dir->children;
     while (pos) {
         int ret = 1;
@@ -400,13 +408,51 @@ int dir_update_size(IsoImage *image, IsoDir *dir)
         } else if (pos->type == LIBISO_DIR) {
             /* recurse */
             ret = dir_update_size(image, ISO_DIR(pos));
+
+#ifdef Libisofs_update_sizes_abortablE
+            if (ret == ISO_CANCELED)
+                return ret; /* Message already issued by dir_update_size */
+#endif
+
         }
+
+#ifdef Libisofs_update_sizes_abortablE
+
+        /* This would report error and abort according to severity threshold.
+           But it is desirable to let the update_size crawler continue
+           its work after e.g. a file has vanished from hard disk.
+           So normally this macro case should be disabled.
+        */
+
         if (ret < 0) {
-            ret = iso_msg_submit(image->id, ret, 0, NULL);
-            if (ret < 0) {
-                return ret; /* cancel due error threshold */
+            cancel_ret = iso_msg_submit(image->id, ret, 0, NULL);
+            path = iso_tree_get_node_path(pos);
+            if (path != NULL) {
+                iso_msg_submit(image->id, ret, 0,
+                               "ISO path  : %s", path);
+                free(path);
+            }
+            /* Report source path with streams which do not come from
+               the loaded ISO filesystem */
+            if (pos->type == LIBISO_FILE &&
+                iso_node_get_old_image_lba(pos, &lba, 0) == 0) {
+                base_stream = iso_stream_get_input_stream(
+                                                     ISO_FILE(pos)->stream, 1);
+                if (base_stream == NULL)
+                    base_stream = ISO_FILE(pos)->stream;
+                path = iso_stream_get_source_path(base_stream, 0);
+                if (path != NULL) {
+                    iso_msg_submit(image->id, ret, 0,
+                                   "Local path: %s", path);
+                    free(path);
                 }
             }
+            if (cancel_ret < 0)
+                return cancel_ret; /* cancel due error threshold */
+        }
+
+#endif /* Libisofs_update_sizes_abortablE */
+
         pos = pos->next;
     }
     return ISO_SUCCESS;

libisofs/libisofs.h

@@ -6421,7 +6421,10 @@ int iso_file_remove_filter(IsoFile *file, int flag);
  * @param stream
  *      The eventual filter stream to be inquired.
  * @param flag
- *      Bitfield for control purposes. Submit 0 for now.
+ *      Bitfield for control purposes.
+ *      bit0= Follow the chain of input streams and return the one at the
+ *            end of the chain. 
+ *            @since 1.3.2
  * @return
  *      The input stream, if one exists. Elsewise NULL.
  *      No extra reference to the stream is taken by this call.

libisofs/stream.c

@@ -890,17 +890,27 @@ void iso_stream_get_file_name(IsoStream *stream, char *name)
     }
 }
 
+/* @param flag  bit0= Obtain most fundamental stream */
 IsoStream *iso_stream_get_input_stream(IsoStream *stream, int flag)
 {
     IsoStreamIface* class;
+    IsoStream *result = NULL, *next;
 
     if (stream == NULL) {
         return NULL;
     }
+    while (1) {
         class = stream->class;
         if (class->version < 2)
-        return NULL;
-    return class->get_input_stream(stream, 0);
+            return result;
+        next = class->get_input_stream(stream, 0);
+        if (next == NULL)
+            return result;
+        result = next;
+        if (!(flag & 1))
+            return result;
+        stream = result;
+    }
 }
 
 char *iso_stream_get_source_path(IsoStream *stream, int flag)

libisofs/tree.c

@@ -803,6 +803,8 @@ int iso_add_dir_src_rec(IsoImage *image, IsoDir *parent, IsoFileSource *dir)
             ret = iso_file_source_lstat(file, &info);
         }
         if (ret < 0) {
+            ret = iso_msg_submit(image->id, ISO_FILE_CANT_ADD, ret,
+                                 "Error when adding file %s", path);
             goto dir_rec_continue;
         }