only link shown for data field

[prjemian]

When using punx tree S-some_file.h5, the /entry/data/data field is shown linked:

    data:NXdata
      @NX_class = "NXdata"
      @signal = "data"
      data --> b'/entry/instrument/detector/data'

but later, in NXinstrument, the data field is only described by its link and not by its content (as expected):

        data --> /entry/instrument/detector/data

Should be easy to test.

[prjemian]

The problem file is written incorrectly for NeXus. There is a circular NeXus reference between /entry/data/data and /entry/instrument/detector/data`.

/entry/instrument/detector/data
            DATASET "data" {
               HARDLINK "/entry/data/data"
            }

This looks fine by HDF5 and by NeXus.

/entry/data/data
            ATTRIBUTE "target" {
               DATATYPE  H5T_STRING {
                  STRSIZE 32;
                  STRPAD H5T_STR_NULLTERM;
                  CSET H5T_CSET_ASCII;
                  CTYPE H5T_C_S1;
               }
               DATASPACE  SCALAR
               DATA {
               (0): "/entry/instrument/detector/data"
               }
            }

Since /entry/instrument/detector/data is a hard link pointing to /entry/data/data, the value of the /entry/data/data@target attribute (here) should be /entry/data/data.

[prjemian]

Something else going on with that file. Such as no image data found.

[prjemian]

Still not reproducing that situation. Might need the original file.

[prjemian]

Here is h5dump structure of target attribute constructed in punx/tests/test_issue210.py:test_create_user_file_structure():

            ATTRIBUTE "target" {
               DATATYPE  H5T_STRING {
                  STRSIZE H5T_VARIABLE;
                  STRPAD H5T_STR_NULLTERM;
                  CSET H5T_CSET_UTF8;
                  CTYPE H5T_C_S1;
               }
               DATASPACE  SCALAR
               DATA {
               (0): "/entry/instrument/detector/data"
               }
            }

Differences from the user-supplied example:

parameter	user file	test file
STRSIZE	32	H5T_VARIABLE
CSET	H5T_CSET_ASCII	H5T_CSET_UTF8