copyfile routine to push files quasi-intelligently

1 files changed, 104 insertions, 0 deletions

diff --git a/modules/copyfile.py b/modules/copyfile.py
new file mode 100644
index 0000000..7d04abf
--- /dev/null
+++ b/modules/copyfile.py
@@ -0,0 +1,104 @@
+# Copyright 2007, Red Hat, Inc
+# seth vidal
+#
+# This software may be freely redistributed under the terms of the GNU
+# general public license.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+
+import sha
+import os
+import time
+import shutil
+
+from modules import func_module
+
+
+
+
+class CopyFile(func_module.FuncModule):
+
+    def __init__(self):
+        self.methods = {
+                "copyfile" : self.copyfile,
+                "checksum" : self.checksum
+        }
+        func_module.FuncModule.__init__(self)
+                             
+    def checksum(self, thing):
+
+        CHUNK=2**16
+        thissum = sha.new()
+        if os.path.exists(thing):
+            fo = open(thing, 'r', CHUNK)
+            chunk = fo.read
+            while chunk:
+                chunk = fo.read(CHUNK)
+                thissum.update(chunk)
+            fo.close()
+            del fo
+        else:
+            # assuming it's a string of some kind
+            thissum.update(thing)
+
+        return thissum.hexdigest()
+
+
+    def copyfile(self, filepath, filebuf):
+        # -1 = problem file was not copied
+        # 1 =  file was copied
+        # 0 = file was not copied b/c file is unchanged
+        
+        dirpath = os.path.dirname(filepath)
+        basepath = os.path.basename(filepath)
+        if not os.path.exists(dirpath):
+            os.makedirs(dirpath)
+        
+        remote_sum = self.checksum(filebuf)
+        local_sum = 0
+        if os.path.exists(filepath):
+            local_sum = self.checksum(filepath)
+        
+        if remote_sum != local_sum:
+            # back up the localone
+            if os.path.exists(filepath):
+                if not self._backuplocal(filepath):
+                    return -1
+
+            # do the new write
+            try:
+                fo = open(filepath, 'w')
+                fo.write(filebuf)
+                fo.close()
+                del fo
+            except (IOError, OSError), e:
+                # XXX logger output here
+                return -1
+        else:
+            return 0
+            
+        return 1
+
+    def _backuplocal(self, fn):
+        """
+        make a date-marked backup of the specified file, 
+        return True or False on success or failure
+        """
+        # backups named basename-YYYY-MM-DD@HH:MM~
+        ext = time.strftime("%Y-%m-%d@%H:%M~", time.localtime(time.time()))
+        backupdest = '%s.%s' % (fn, ext)
+        
+        try:
+            shutil.copy2(fn, backupdest)
+        except shutil.Error, e:
+            #XXX logger output here
+            return False
+        return True
+
+
+
+methods = CopyFile()
+register_rpc = methods.register_rpc