reduce finding time zone file to top level distro

remove duplicates of some code.

4 files changed, 12 insertions, 21 deletions

diff --git a/cloudinit/distros/__init__.py b/cloudinit/distros/__init__.py
index 249e1b19..74e95797 100644
--- a/cloudinit/distros/__init__.py
+++ b/cloudinit/distros/__init__.py
@@ -47,9 +47,11 @@ LOG = logging.getLogger(__name__)
 
 class Distro(object):
     __metaclass__ = abc.ABCMeta
+
     hosts_fn = "/etc/hosts"
     ci_sudoers_fn = "/etc/sudoers.d/90-cloud-init-users"
     hostname_conf_fn = "/etc/hostname"
+    tz_zone_dir = "/usr/share/zoneinfo"
 
     def __init__(self, name, cfg, paths):
         self._paths = paths
@@ -66,6 +68,13 @@ class Distro(object):
         # to write this blob out in a distro format
         raise NotImplementedError()
 
+    def _find_tz_file(self, tz):
+        tz_file = os.path.join(self.tz_zone_dir, str(tz))
+        if not os.path.isfile(tz_file):
+            raise IOError(("Invalid timezone %s,"
+                           " no file found at %s") % (tz, tz_file))
+        return tz_file
+
     def get_option(self, opt_name, default=None):
         return self._cfg.get(opt_name, default)
 
diff --git a/cloudinit/distros/debian.py b/cloudinit/distros/debian.py
index 0811eefd..8fe49cbe 100644
--- a/cloudinit/distros/debian.py
+++ b/cloudinit/distros/debian.py
@@ -44,7 +44,6 @@ class Distro(distros.Distro):
     network_conf_fn = "/etc/network/interfaces"
     tz_conf_fn = "/etc/timezone"
     tz_local_fn = "/etc/localtime"
-    tz_zone_dir = "/usr/share/zoneinfo"
 
     def __init__(self, name, cfg, paths):
         distros.Distro.__init__(self, name, cfg, paths)
@@ -130,12 +129,7 @@ class Distro(distros.Distro):
         return "127.0.1.1"
 
     def set_timezone(self, tz):
-        # TODO(harlowja): move this code into
-        # the parent distro...
-        tz_file = os.path.join(self.tz_zone_dir, str(tz))
-        if not os.path.isfile(tz_file):
-            raise RuntimeError(("Invalid timezone %s,"
-                                " no file found at %s") % (tz, tz_file))
+        tz_file = self._find_tz_file(tz)
         # Note: "" provides trailing newline during join
         tz_lines = [
             util.make_header(),
diff --git a/cloudinit/distros/rhel.py b/cloudinit/distros/rhel.py
index a022ca60..ece1a5ff 100644
--- a/cloudinit/distros/rhel.py
+++ b/cloudinit/distros/rhel.py
@@ -51,7 +51,6 @@ class Distro(distros.Distro):
     network_script_tpl = '/etc/sysconfig/network-scripts/ifcfg-%s'
     resolve_conf_fn = "/etc/resolv.conf"
     tz_local_fn = "/etc/localtime"
-    tz_zone_dir = "/usr/share/zoneinfo"
 
     def __init__(self, name, cfg, paths):
         distros.Distro.__init__(self, name, cfg, paths)
@@ -164,12 +163,7 @@ class Distro(distros.Distro):
         return distros.Distro._bring_up_interfaces(self, device_names)
 
     def set_timezone(self, tz):
-        # TODO(harlowja): move this code into
-        # the parent distro...
-        tz_file = os.path.join(self.tz_zone_dir, str(tz))
-        if not os.path.isfile(tz_file):
-            raise RuntimeError(("Invalid timezone %s,"
-                                " no file found at %s") % (tz, tz_file))
+        tz_file = self._find_tz_file(tz)
         if self._dist_uses_systemd():
             # Currently, timedatectl complains if invoked during startup
             # so for compatibility, create the link manually.
diff --git a/cloudinit/distros/sles.py b/cloudinit/distros/sles.py
index 904e931a..92a1c307 100644
--- a/cloudinit/distros/sles.py
+++ b/cloudinit/distros/sles.py
@@ -42,7 +42,6 @@ class Distro(distros.Distro):
     network_script_tpl = '/etc/sysconfig/network/ifcfg-%s'
     resolve_conf_fn = '/etc/resolv.conf'
     tz_local_fn = '/etc/localtime'
-    tz_zone_dir = '/usr/share/zoneinfo'
 
     def __init__(self, name, cfg, paths):
         distros.Distro.__init__(self, name, cfg, paths)
@@ -151,12 +150,7 @@ class Distro(distros.Distro):
         return distros.Distro._bring_up_interfaces(self, device_names)
 
     def set_timezone(self, tz):
-        # TODO(harlowja): move this code into
-        # the parent distro...
-        tz_file = os.path.join(self.tz_zone_dir, str(tz))
-        if not os.path.isfile(tz_file):
-            raise RuntimeError(("Invalid timezone %s,"
-                                " no file found at %s") % (tz, tz_file))
+        tz_file = self._find_tz_file(tz)
         # Adjust the sysconfig clock zone setting
         clock_cfg = {
             'TIMEZONE': str(tz),