diff --git a/hgext/transplant.py b/hgext/transplant.py
--- a/hgext/transplant.py
+++ b/hgext/transplant.py
@@ -177,12 +177,11 @@ class transplanter(object):
             lock.release()
             wlock.release()
 
-    def filter(self, filter, changelog, patchfile):
+    def filter(self, filter, node, changelog, patchfile):
         '''arbitrarily rewrite changeset before applying it'''
 
         self.ui.status(_('filtering %s\n') % patchfile)
         user, date, msg = (changelog[1], changelog[2], changelog[4])
-
         fd, headerfile = tempfile.mkstemp(prefix='hg-transplant-')
         fp = os.fdopen(fd, 'w')
         fp.write("# HG changeset patch\n")
@@ -194,7 +193,9 @@ class transplanter(object):
         try:
             util.system('%s %s %s' % (filter, util.shellquote(headerfile),
                                    util.shellquote(patchfile)),
-                        environ={'HGUSER': changelog[1]},
+                        environ={'HGUSER': changelog[1],
+                                 'HGREVISION': revlog.hex(node),
+                                 },
                         onerr=util.Abort, errprefix=_('filter failed'))
             user, date, msg = self.parselog(file(headerfile))[1:4]
         finally:
@@ -209,7 +210,7 @@ class transplanter(object):
         date = "%d %d" % (time, timezone)
         extra = {'transplant_source': node}
         if filter:
-            (user, date, message) = self.filter(filter, cl, patchfile)
+            (user, date, message) = self.filter(filter, node, cl, patchfile)
 
         if log:
             # we don't translate messages inserted into commits
diff --git a/tests/test-transplant.t b/tests/test-transplant.t
--- a/tests/test-transplant.t
+++ b/tests/test-transplant.t
@@ -330,6 +330,27 @@ test filter with failed patch
   [255]
   $ cd ..
 
+test environment passed to filter
+
+  $ hg init filter-environment
+  $ cd filter-environment
+  $ cat <<'EOF' >test-filter-environment
+  > #!/bin/sh
+  > echo "Transplant by $HGUSER" >> $1
+  > echo "Transplant from rev $HGREVISION" >> $1
+  > EOF
+  $ chmod +x test-filter-environment
+  $ hg transplant -s ../t --filter ./test-filter-environment 0
+  filtering * (glob)
+  applying 17ab29e464c6
+  17ab29e464c6 transplanted to 5190e68026a0
+
+  $ hg log --template '{rev} {parents} {desc}\n'
+  0  r1
+  Transplant by test
+  Transplant from rev 17ab29e464c6ca53e329470efe2a9918ac617a6f
+  $ cd ..
+
 
 test with a win32ext like setup (differing EOLs)