Add modulecmd wrapper to lmod-ohpc for scl-utils dependency?

[ECoulter]

Greetings, All!

I've run into a dependency issue while trying to install Open OnDemand (openondemand.org) with OpenHPC 2.3 on Rocky 8.4, which requires scl-utils, which in turn requires /usr/bin/modulecmd, which is only provided by environment-modules, which then conflicts with lmod-ohpc. (I'd prefer to keep using LMod, of course)

Would it be possible to add a simple wrapper for modulecmd -> lmod to the lmod-ohpc package, similar to this workaround:
hpcugent/Lmod-UGent@47bc1a6
?

In the meantime, planning to see if a temporary switch to env-modules will work, or possibly testing with a local rebuild of the lmod-ohpc package; I'll update here as we go.

Cheers,
Eric C.

[sjpb]

Hi @ECoulter, I've just just hit the same thing ... did you ever get a solution to this please?!

[sjpb]

Error for posterity:

Depsolve Error occured: 
 Problem: package scl-utils-1:2.0.2-13.el8.x86_64 requires /usr/bin/modulecmd, but none of the providers can be installed
  - package lmod-ohpc-8.2.10-15.1.ohpc.2.0.x86_64 obsoletes environment-modules provided by environment-modules-4.5.2-1.el8.x86_64
  - problem with installed package lmod-ohpc-8.2.10-15.1.ohpc.2.0.x86_64
  - installed package lmod-ohpc-8.2.10-15.1.ohpc.2.0.x86_64 obsoletes environment-modules provided by environment-modules-4.5.2-1.el8.x86_64
  - package ondemand-runtime-2.0-1.el8.x86_64 requires scl-utils, but none of the providers can be installed
  - package ondemand-2.0.18-1.el8.x86_64 requires ondemand-runtime >= 2.0-1, but none of the providers can be installed
  - package ondemand-2.0.18-1.el8.x86_64 requires ondemand-runtime < 2.1, but none of the providers can be installed
  - package ondemand-2.0.18-1.el8.x86_64 requires ondemand-runtime < 3.0, but none of the providers can be installed
  - cannot install the best candidate for the job

[adrianreber]

I think the workaround mentioned in the first comment would be a good idea for OpenHPC. If anyone can provide a patch that would be great.

[sjpb]

I'm afraid I don't understand packaging enough to understand the patch! I may have a go locally and if I can educate myself, do that.

[ECoulter]

Ah this is good motivation. I'll block out some time and see if I can get a patch working & pull request submitted.
I'd been wanting to, but knowing more folks are interested helps a lot.

[sjpb]

I've got a cluster up I can test a patch on. Having tried some other things I've currently just rebuilt the rpm having commented out Obsoletes: environment-modules .. which at least got the openondemand role to complete and allowed me to work on understanding other bits, but isn't really a solution 😆. I'm sure you're ahead of that but if you want my notes from that rebuild process let me know.

[ECoulter]

In my local test virtual cluster, I've got an lmod-ohpc rpm built with the following diff to add a symlink for modulecmd - not tested fully, but I think it's a better solution than a wrapper script - at least dnf is satisfied with the change. Also need to figure out how to get a pull request in against the correct branch... next week!

---

Author: Eric Coulter jecoulte@iu.edu
Date: Thu Oct 14 16:15:53 2021 -0400

Added a softlink for modulecmd

Adds a softlink from the lmod binary to /usr/bin/modulecmd
which is required by scl-utils, among other things.

Signed-off-by: Eric Coulter <jecoulte@iu.edu>

diff --git a/components/admin/lmod/SPECS/lmod.spec b/components/admin/lmod/SPECS/lmod.spec
index 13eef12ab..5fabd33d9 100644
--- a/components/admin/lmod/SPECS/lmod.spec
+++ b/components/admin/lmod/SPECS/lmod.spec
@@ -182,6 +182,12 @@ EOF

%{__mkdir_p} ${RPM_BUILD_ROOT}/%{_docdir}

+#install a modulecmd soft link
+# to allow use of scl-utils, among other dependencies
+%{__mkdir_p} %{buildroot}/%{_bindir}
+
+%{__ln_s} %{OHPC_ADMIN}/lmod/lmod/libexec/lmod %{buildroot}/%{_bindir}/modulecmd
+
%files
%dir %{OHPC_HOME}
%dir %{OHPC_ADMIN}
@@ -190,3 +196,4 @@ EOF
%config %{_sysconfdir}/profile.d/lmod.csh
%{OHPC_PUB}
%doc License README.md README_lua_modulefiles.txt INSTALL
+%{_bindir}/modulecmd

[sjpb]

Thanks! Works for me, in that after building/installing an RPM with it I can install openhpc v2 with lmod-ohpc-dependement packages, and then install scl-utils.x86_64 1:2.0.2-13.el8 @appstream.

[koomie]

Thanks you for the the testing on this and PR.