Document reason to run it in chroot

Signed-off-by: Nils Philippsen <[email protected]>

mock/py/mockbuild/plugins/rpmautospec.py

@@ -109,6 +109,11 @@ def attempt_process_distgit(
         command += [chroot_sources_spec]  # <input-spec>
         command += [chroot_spec]  # <output-spec>
 
+        # Run the rpmautospec tool in the chroot sandbox. This minimizes
+        # external dependencies in the host, e.g. the Koji build system. As a
+        # bonus, spec files will be processed in the environment they will be
+        # built for, reducing the impact of the host system on the outcome,
+        # leading to more deterministic results and better repeatable builds.
         self.buildroot.doChroot(
             command,
             shell=False,