xattr tool update

Lib/xattr/tool.py

@@ -29,16 +29,17 @@
 import os
 import getopt
 import xattr
+import zlib
 
 def usage(e=None):
     if e:
         print e
         print ""
 
     name = os.path.basename(sys.argv[0])
-    print "usage: %s [-l] file [file ...]" % (name,)
-    print "       %s -p [-l] attr_name file [file ...]" % (name,)
-    print "       %s -w attr_name attr_value file [file ...]" % (name,)
+    print "usage: %s [-lz] file [file ...]" % (name,)
+    print "       %s -p [-lz] attr_name file [file ...]" % (name,)
+    print "       %s -w [-z] attr_name attr_value file [file ...]" % (name,)
     print "       %s -d attr_name file [file ...]" % (name,)
     print ""
     print "The first form lists the names of all xattrs on the given file(s)."
@@ -49,15 +50,30 @@ def usage(e=None):
     print "options:"
     print "  -h: print this help"
     print "  -l: print long format (attr_name: attr_value)"
+    print "  -z: compress or decompress (if compressed) attribute value in zip format"
 
     if e:
         sys.exit(64)
     else:
         sys.exit(0)
 
+class NullsInString(Exception):
+    """Nulls in string."""
+
+_FILTER=''.join([(len(repr(chr(x)))==3) and chr(x) or '.' for x in range(256)])
+
+def _dump(src, length=16):
+    result=[]
+    for i in xrange(0, len(src), length):
+        s = src[i:i+length]
+        hexa = ' '.join(["%02X"%ord(x) for x in s])
+        printable = s.translate(_FILTER)
+        result.append("%04X   %-*s   %s\n" % (i, length*3, hexa, printable))
+    return ''.join(result)
+
 def main():
     try:
-        (optargs, args) = getopt.getopt(sys.argv[1:], "hlpwd", ["help"])
+        (optargs, args) = getopt.getopt(sys.argv[1:], "hlpwdz", ["help"])
     except getopt.GetoptError, e:
         usage(e)
 
@@ -66,6 +82,8 @@ def main():
     read        = False
     write       = False
     delete      = False
+    compress    = lambda x: x
+    decompress  = compress
     status      = 0
 
     for opt, arg in optargs:
@@ -75,10 +93,19 @@ def main():
             long_format = True
         elif opt == "-p":
             read = True
+            if write or delete:
+                usage("-p not allowed with -w or -d")
         elif opt == "-w":
             write = True
+            if read or delete:
+                usage("-w not allowed with -p or -d")
         elif opt == "-d":
             delete = True
+            if read or write:
+                usage("-d not allowed with -p or -w")
+        elif opt == "-z":
+            compress   = zlib.compress
+            decompress = zlib.decompress
 
     if write or delete:
         if long_format:
@@ -115,7 +142,7 @@ def onError(e):
 
         if write:
             try:
-                attrs[attr_name] = attr_value
+                attrs[attr_name] = compress(attr_value)
             except (IOError, OSError), e:
                 onError(e)
                 continue
@@ -147,17 +174,28 @@ def onError(e):
 
             for attr_name in attr_names:
                 try:
-                    if long_format:
-                        print "".join((file_prefix, "%s: " % (attr_name,), attrs[attr_name]))
-                    else:
-                        if read:
-                            print "".join((file_prefix, attrs[attr_name]))
-                        else:
-                            print "".join((file_prefix, attr_name))
+                    try:
+                        attr_value = decompress(attrs[attr_name])
+                    except zlib.error:
+                        attr_value = attrs[attr_name]
                 except KeyError:
                     onError("%sNo such xattr: %s" % (file_prefix, attr_name))
                     continue
 
+                if long_format:
+                    try:
+                        if attr_value.find('\0') >= 0:
+                            raise NullsInString;
+                        print "".join((file_prefix, "%s: " % (attr_name,), attr_value))
+                    except (UnicodeDecodeError, NullsInString):
+                        print "".join((file_prefix, "%s:" % (attr_name,)))
+                        print _dump(attr_value)
+                else:
+                    if read:
+                        print "".join((file_prefix, attr_value))
+                    else:
+                        print "".join((file_prefix, attr_name))
+
     sys.exit(status)
 
 if __name__ == "__main__":