DataSourceNoCloud: allow reading user-data and meta-data from simple files

This allows you to attach a disk in ISO9660 or vfat filesystem format
labeled 'cidata' with 'user-data' and 'meta-data' on it.

It provides a much easier way to interact with cloud-init in nocloud
than mounting the image or the OVF method.

1 files changed, 21 insertions, 0 deletions

diff --git a/cloudinit/DataSourceNoCloud.py b/cloudinit/DataSourceNoCloud.py
index fa64f2e5..6c744b82 100644
--- a/cloudinit/DataSourceNoCloud.py
+++ b/cloudinit/DataSourceNoCloud.py
@@ -23,6 +23,7 @@ import cloudinit.DataSource as DataSource
 from cloudinit import seeddir as base_seeddir
 from cloudinit import log
 import cloudinit.util as util
+import errno
 
 
 class DataSourceNoCloud(DataSource.DataSource):
@@ -64,6 +65,26 @@ class DataSourceNoCloud(DataSource.DataSource):
             found.append(self.seeddir)
             log.debug("using seeded cache data in %s" % self.seeddir)
 
+        fslist = util.find_devs_with("TYPE=vfat")
+        fslist.extend(util.find_devs_with("TYPE=iso9660"))
+
+        label_list = util.find_devs_with("LABEL=cidata")
+        devlist = list(set(fslist) & set(label_list))
+        devlist.sort(reverse=True)
+
+        for dev in devlist:
+            try:
+                (newmd, newud) = util.mount_callback_umount(dev,
+                    util.read_seeded)
+                md = util.mergedict(newmd, md)
+                ud = newud
+                log.debug("using data from %s" % dev)
+                found.append(dev)
+                break
+            except OSError, e:
+                if e.errno != errno.ENOENT:
+                    raise
+
         # there was no indication on kernel cmdline or data
         # in the seeddir suggesting this handler should be used.
         if len(found) == 0: