Slurm: extend spack external find support (#47740)

* Slurm: extend spack external find support

On Debian srun/salloc --version returns 'slurm-wlm VERSION'. Check for both strings and return the first match.

* non-capturing group for slurm determine_version

Co-authored-by: Wouter Deconinck <wdconinc@gmail.com>

* slurm: add detection test

---------

Co-authored-by: Wouter Deconinck <wdconinc@gmail.com>

var/spack/repos/builtin/packages/slurm/detection_test.yaml

@@ -0,0 +1,23 @@
+paths:
+- layout:
+  # SLES:
+  - executables:
+    - "bin/srun"
+    script: |
+      echo "slurm 22.05.8"
+  - executables:
+    - "bin/salloc"
+    script: |
+      echo "slurm 22.05.8"
+  # Debian:
+  - executables:
+    - "bin/srun"
+    script: |
+      echo "slurm-wlm 22.05.8"
+  - executables:
+    - "bin/salloc"
+    script: |
+       echo "slurm-wlm 22.05.8"
+  platforms: ["linux"]
+  results:
+  - spec: "slurm@22.05.8"

var/spack/repos/builtin/packages/slurm/package.py

@@ -178,7 +178,7 @@ class Slurm(AutotoolsPackage):
     @classmethod
     def determine_version(cls, exe):
         output = Executable(exe)("--version", output=str).rstrip()
-        match = re.search(r"slurm\s*([0-9.]+)", output)
+        match = re.search(r"slurm(?:-wlm)?\s*([0-9.]+)", output)
         return match.group(1) if match else None
 
     def flag_handler(self, name, flags):