assertion() when opening a non-nczarr zarr dataset in nczarr mode

[rouault]

netcdf git at 84f0696, Ubuntu 20.04

on the attached zarr dataset groups_regular.zarr.zip (after unzipping it),

$ gdb --args ncdump/ncdump  "file://groups_regular.zarr#mode=nczarr,file"
(gdb) r
Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7f0cd3d in define_vars (file=0x5555555c8840, grp=0x5555555d0550, varnames=0x5555555d7410) at /home/even/netcdf-c/libnczarr/zsync.c:1514
1514	   	    assert((NCJsort(jncvar) == NCJ_DICT));
(gdb) bt
#0  0x00007ffff7f0cd3d in define_vars (file=0x5555555c8840, grp=0x5555555d0550, varnames=0x5555555d7410) at /home/even/netcdf-c/libnczarr/zsync.c:1514
#1  0x00007ffff7f0b928 in define_grp (file=0x5555555c8840, grp=0x5555555d0550) at /home/even/netcdf-c/libnczarr/zsync.c:1139
#2  0x00007ffff7f0d3c4 in define_subgrps (file=0x5555555c8840, grp=0x5555555c8910, subgrpnames=0x5555555cfcb0) at /home/even/netcdf-c/libnczarr/zsync.c:1607
#3  0x00007ffff7f0b948 in define_grp (file=0x5555555c8840, grp=0x5555555c8910) at /home/even/netcdf-c/libnczarr/zsync.c:1142
#4  0x00007ffff7f0b67c in ncz_read_file (file=0x5555555c8840) at /home/even/netcdf-c/libnczarr/zsync.c:1051
#5  0x00007ffff7f07ad9 in ncz_open_file (path=0x5555555c80f0 "file://groups_regular.zarr#mode=nczarr,file", mode=4096, controls=0x5555555c8170, ncid=65536) at /home/even/netcdf-c/libnczarr/zopen.c:106
#6  0x00007ffff7f07c73 in NCZ_open (path=0x5555555c80f0 "file://groups_regular.zarr#mode=nczarr,file", mode=4096, basepe=0, chunksizehintp=0x0, parameters=0x0, dispatch=0x7ffff7fb08e0 <NCZ_dispatcher>, 
    ncid=65536) at /home/even/netcdf-c/libnczarr/zopen.c:183
#7  0x00007ffff7e27ee4 in NC_open (path0=0x55555558c940 "file://groups_regular.zarr#mode=nczarr,file", omode=4096, basepe=0, chunksizehintp=0x0, useparallel=0, parameters=0x0, ncidp=0x7fffffffcdf4)
    at /home/even/netcdf-c/libdispatch/dfile.c:2128
#8  0x00007ffff7e26c07 in nc_open (path=0x55555558c940 "file://groups_regular.zarr#mode=nczarr,file", omode=0, ncidp=0x7fffffffcdf4) at /home/even/netcdf-c/libdispatch/dfile.c:657
#9  0x000055555555e141 in main (argc=1, argv=0x7fffffffdf40) at /home/even/netcdf-c/ncdump/ncdump.c:2423

[DennisHeimbigner]

How did you generate that file?

[rouault]

How did you generate that file?

nccopy groups.h5 "file://groups_regular.zarr#mode=zarr,file" with groups.h5 from https://github.com/OSGeo/gdal/blob/master/autotest/gdrivers/data/hdf5/groups.h5?raw=true