Due to an Apptainer bug, users might encounter the following error message when converting the Delft3D FM Docker image to an Apptainer sif file:

Conversion error output
ERROR: Could not remove bundle: while removing bundle: could not remove "/tmp/build-temp-3972609318": %!v(PANIC=Error method: errSymlink is not user-visible)


This means that temporary files that are generated during the conversion process are not deleted. 

There is no impact on the functionality of the container. We suggest that you clean up any temporary files manually. 


The installation of Intel MPI on the host cluster, and any run scripts that refer to Intel MPI, must be updated accordingly.

For users of our Apptainer submit_singularity_h7.sh script, the Intel MPI module should be updated under the section #--- Load modules ---. 


Apptainer v1.4 currently (April 2026) uses a non-FIPS compliant Go library for pulling container images from a Docker container image registry.

FIPS error output
INFO:    Creating SIF file...
panic: opensslcrypto: can't enable FIPS mode for OpenSSL 3.5.1 1 Jul 2025: OSSL_PROVIDER_try_load
  openssl error(s):
  error:12800067:DSO support routines::could not load the shared library
    crypto/dso/dso_dlfcn.c:118
  error:12800067:DSO support routines::could not load the shared library
    crypto/dso/dso_lib.c:147
  error:07880025:common libcrypto routines::reason(37)
    crypto/provider_core.c:1019

goroutine 1 [running]: 
crypto/internal/backend.init.0()
  crypto/internal/backend/openssl.go:77 +0x254

However, the Delft3D (2026.02 and later) SIF images that can be obtained from our download portal are FIPS-140 compliant.

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