Add package class hook for SNL work

lib/spack/spack/package_base.py

@@ -989,6 +989,15 @@ def detect_dev_src_change(self) -> bool:
         assert dev_path_var and record, "dev_path variant and record must be present"
         return fsys.recursive_mtime_greater_than(dev_path_var.value, record.installation_time)
 
+    def resolve_binary_provenance(self):
+        """
+        Method to ensure concrete spec has binary provenance.
+        Base implementation will look up git commits when appropriate.
+        Packages may override this implementation for custom implementations
+        """
+        # TODO in follow on PR adding here so SNL team can begin work ahead of spack core
+        pass
+
     def all_urls_for_version(self, version: StandardVersion) -> List[str]:
         """Return all URLs derived from version_urls(), url, urls, and
         list_url (if it contains a version) in a package in that order.

lib/spack/spack/solver/asp.py

@@ -4185,6 +4185,42 @@ def execute_explicit_splices(self):
         return specs
 
 
+def _specs_with_commits(spec):
+    # StandardVersions paired to git branches or tags and GitVersions
+    if not spec.version.needs_commit:
+        return
+    spec.package.resolve_binary_provenance()
+
+    # method above is in charge of assigning the commit variant
+    has_commit_var = "commit" in spec.variants
+    has_git_version = isinstance(spec.version, vn.GitVersion)
+
+    if not (has_commit_var or has_git_version):
+        return
+
+    # Specs with commit variants
+    # - variant value satsifies commit regex
+    # - paired to a GitVersion or version that is associated with a branch/tag
+    # - variant value should match GitVersion's commit value
+    if has_commit_var:
+        invalid_commit_msg = (
+            f"Internal Error: {spec.name}'s assigned commit {spec.variants['commit'].value}"
+            " does not meet commit syntax requirements."
+        )
+
+        # TODO probably want a more specific function just for sha validation
+        assert vn.is_git_version(spec.variants["commit"].value), invalid_commit_msg
+
+    # Specs with GitVersions
+    # - must have a commit variant, or add it here
+    # - must have a commit on the GitVersion (enforce after look up implemented)
+    if has_git_version:
+        if not spec.version.commit_sha:
+            # TODO(psakiev) this will be a failure when commit look up is automated
+            return
+        spec.variants["commit"] = vt.SingleValuedVariant("commit", spec.version.commit_sha)
+
+
 def _inject_patches_variant(root: spack.spec.Spec) -> None:
     # This dictionary will store object IDs rather than Specs as keys
     # since the Spec __hash__ will change as patches are added to them

lib/spack/spack/version/version_types.py

@@ -391,6 +391,9 @@ def isdevelop(self) -> bool:
             isinstance(p, VersionStrComponent) and isinstance(p.data, int) for p in self.version[0]
         )
 
+    def needs_commit(self) -> bool:
+        return bool(self.get("branch") or self.get("tag"))
+
     def is_prerelease(self) -> bool:
         return self.version[1][0] != FINAL
 
@@ -716,6 +719,9 @@ def __hash__(self):
     def __contains__(self, other: object) -> bool:
         raise NotImplementedError
 
+    def needs_commit(self) -> bool:
+        return True
+
     @property
     def ref_lookup(self):
         if self._ref_lookup: