--- a/Makefile
+++ b/Makefile
@@ -25,8 +25,8 @@
 # latest Ubuntu LTS release (2.0.2 for 12.04 LTS) may be dropped if they
 # interfere with new development.  The latest released minor version should be
 # listed for each major version; earlier minor versions are not needed.
-all-version-tests: tests-1.5.4 tests-1.6.4 tests-1.7.5 tests-1.8.4 \
-                   tests-1.9.3 tests-2.0.2 tests-2.1.2 tests-2.2.3 \
-                   tests-2.3 tests-tip
+all-version-tests: tests-1.6.4 tests-1.7.5 tests-1.8.4 tests-1.9.3 \
+                   tests-2.0.2 tests-2.1.2 tests-2.2.3 tests-2.3 \
+                   tests-tip
 
 .PHONY: tests all-version-tests

--- a/README.md
+++ b/README.md
@@ -141,7 +141,6 @@
 is not compulsory, but it makes some things a bit nicer for you.
 
 This plugin is currently tested against the following Mercurial versions:
- * 1.5.4
  * 1.6.4
  * 1.7.5
  * 1.8.4

--- a/hggit/__init__.py
+++ b/hggit/__init__.py
@@ -28,6 +28,7 @@
 from mercurial import help
 from mercurial import hg
 from mercurial import localrepo
+from mercurial import revset
 from mercurial import templatekw
 from mercurial import util as hgutil
 from mercurial import url
@@ -94,6 +95,9 @@
 
 def extsetup():
     templatekw.keywords.update({'gitnode': gitnodekw})
+    revset.symbols.update({
+        'fromgit': revset_fromgit, 'gitnode': revset_gitnode
+    })
     helpdir = os.path.join(os.path.dirname(__file__), 'help')
     entry = (['git'], _("Working with Git Repositories"),
         lambda: open(os.path.join(helpdir, 'git.rst')).read())
@@ -177,6 +181,29 @@
     # 1.7+
     pass
 
+def revset_fromgit(repo, subset, x):
+    '''``fromgit()``
+    Select changesets that originate from Git.
+    '''
+    args = revset.getargs(x, 0, 0, "fromgit takes no arguments")
+    git = GitHandler(repo, repo.ui)
+    return [r for r in subset if git.map_git_get(repo[r].hex()) is not None]
+
+def revset_gitnode(repo, subset, x):
+    '''``gitnode(hash)``
+    Select changesets that originate in the given Git revision.
+    '''
+    args = revset.getargs(x, 1, 1, "gitnode takes one argument")
+    rev = revset.getstring(args[0],
+                           "the argument to gitnode() must be a hash")
+    git = GitHandler(repo, repo.ui)
+    def matches(r):
+        gitnode = git.map_git_get(repo[r].hex())
+        if gitnode is None:
+            return False
+        return rev in [gitnode, gitnode[:12]]
+    return [r for r in subset if matches(r)]
+
 def gitnodekw(**args):
     """:gitnode: String.  The Git changeset identification hash, as a 40 hexadecimal digit string."""
     node = args['ctx']

--- a/hggit/help/git.rst
+++ b/hggit/help/git.rst
@@ -58,6 +58,21 @@
   $ hg log --template='{rev}:{node|short}:{gitnode|short} {desc}\n'
   $ hg log --template='hg: {node}\ngit: {gitnode}\n{date|isodate} {author}\n{desc}\n\n'
 
+For finding changesets from Git, Hg-Git extends revsets to provide two new
+selectors:
+
+  :fromgit: Select changesets that originate from Git. Takes no arguments.
+  :gitnode: Select changesets that originate in a specific Git revision. Takes
+    a revision argument.
+
+For example::
+
+  $ hg log -r 'fromgit()'
+  $ hg log -r 'gitnode(84f75b909fc3)'
+
+Revsets are accepted by several Mercurial commands for specifying revisions.
+See ``hg help revsets`` for details.
+
 Limitations
 -----------
 

--- a/tests/test-keywords
+++ b/tests/test-keywords
@@ -48,3 +48,7 @@
 hg commit -m 'add gamma'
 
 hg log --template "{rev} {node} {node|short} {gitnode} {gitnode|short}\n"
+hg log --template "fromgit {rev}\n" --rev "fromgit()"
+hg log --template "gitnode_existsA {rev}\n" --rev "gitnode(9497a4ee62e16ee641860d7677cdb2589ea15554)"
+hg log --template "gitnode_existsB {rev}\n" --rev "gitnode(7eeab2ea75ec)"
+hg log --template "gitnode_notexists {rev}\n" --rev "gitnode(1234567890ab)"

--- a/tests/test-keywords.out
+++ b/tests/test-keywords.out
@@ -5,3 +5,7 @@
 2 a9da0c7c9bb7574b0f3139ab65cabac7468d6b8d a9da0c7c9bb7  
 1 7bcd915dc873c654b822f01b0a39269b2739e86d 7bcd915dc873 9497a4ee62e16ee641860d7677cdb2589ea15554 9497a4ee62e1
 0 3442585be8a60c6cd476bbc4e45755339f2a23ef 3442585be8a6 7eeab2ea75ec1ac0ff3d500b5b6f8a3447dd7c03 7eeab2ea75ec
+fromgit 0
+fromgit 1
+gitnode_existsA 1
+gitnode_existsB 0