Show ccache stats at the end of the build

Zero the ccache stats at the beginning of the build and then display the
ccache stats at the end of the build to see how effective ccache was.

Signed-off-by: Brian J. Murrell <[email protected]>

mock/py/mockbuild/plugins/ccache.py

@@ -35,6 +35,7 @@ def __init__(self, plugins, conf, buildroot):
         buildroot.preexisting_deps.append("ccache")
         plugins.add_hook("prebuild", self._ccacheBuildHook)
         plugins.add_hook("preinit", self._ccachePreInitHook)
+        plugins.add_hook("postbuild", self._ccachePostBuildHook)
         buildroot.mounts.add(
             BindMountPoint(srcpath=self.ccachePath, bindpath=buildroot.make_chroot_path("/var/tmp/ccache")))
 
@@ -47,6 +48,9 @@ def __init__(self, plugins, conf, buildroot):
     @traceLog()
     def _ccacheBuildHook(self):
         self.buildroot.doChroot(["ccache", "-M", str(self.ccache_opts['max_cache_size'])], shell=False)
+        # zero ccache stats
+        getLog().info("Zero ccache stats:")
+        self.buildroot.doChroot(["ccache", "--zero-stats"], printOutput=True, shell=False)
 
     # set up the ccache dir.
     # we also set a few variables used by ccache to find the shared cache.
@@ -61,3 +65,10 @@ def _ccachePreInitHook(self):
         file_util.mkdirIfAbsent(self.buildroot.make_chroot_path('/var/tmp/ccache'))
         file_util.mkdirIfAbsent(self.ccachePath)
         self.buildroot.uid_manager.changeOwner(self.ccachePath, recursive=True)
+
+    # get some cache stats
+    def _ccachePostBuildHook(self):
+        # show the cache hit stats
+        getLog().info("ccache stats:")
+        self.buildroot.doChroot(["ccache", "--show-stats"], printOutput=True, shell=False)
++