autobuild: add some system information to the autobuild tarball

When running multiple autobuilds on VMs with various parameters, you
can easily get confused about which was which, and the tarball doesn't
help much. This adds an extra file with information about the system.

Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>

script/autobuild.py

@@ -362,6 +362,16 @@ class buildlist(object):
         self.kill_kids()
         return (0, None, None, None, "All OK")
 
+    def write_system_info(self):
+        filename = 'system-info.txt'
+        f = open(filename, 'w')
+        for cmd in ['uname -a', 'free', 'cat /proc/cpuinfo']:
+            print >>f, '### %s' % cmd
+            print >>f, run_cmd(cmd, output=True, checkfail=False)
+            print >>f
+        f.close()
+        return filename
+
     def tarlogs(self, fname):
         tar = tarfile.open(fname, "w:gz")
         for b in self.tlist:
@@ -369,6 +379,8 @@ class buildlist(object):
             tar.add(b.stderr_path, arcname="%s.stderr" % b.tag)
         if os.path.exists("autobuild.log"):
             tar.add("autobuild.log")
+        sys_info = self.write_system_info()
+        tar.add(sys_info)
         tar.close()
 
     def remove_logs(self):