convert: add bookmarks reading support to git backend

convert: add bookmarks reading support to git backend

--- a/hgext/convert/git.py	Thu Mar 24 15:12:51 2011 -0500
+++ b/hgext/convert/git.py	Fri Mar 25 01:38:43 2011 +0100
@@ -17,19 +17,27 @@
     # cannot remove environment variable. Just assume none have
     # both issues.
     if hasattr(os, 'unsetenv'):
-        def gitopen(self, s):
+        def gitopen(self, s, noerr=False):
             prevgitdir = os.environ.get('GIT_DIR')
             os.environ['GIT_DIR'] = self.path
             try:
-                return util.popen(s, 'rb')
+                if noerr:
+                    (stdin, stdout, stderr) = util.popen3(s)
+                    return stdout
+                else:
+                    return util.popen(s, 'rb')
             finally:
                 if prevgitdir is None:
                     del os.environ['GIT_DIR']
                 else:
                     os.environ['GIT_DIR'] = prevgitdir
     else:
-        def gitopen(self, s):
-            return util.popen('GIT_DIR=%s %s' % (self.path, s), 'rb')
+        def gitopen(self, s, noerr=False):
+            if noerr:
+                (sin, so, se) = util.popen3('GIT_DIR=%s %s' % (self.path, s))
+                return stdout
+            else:
+                util.popen('GIT_DIR=%s %s' % (self.path, s), 'rb')
 
     def gitread(self, s):
         fh = self.gitopen(s)
@@ -168,3 +176,30 @@
             raise util.Abort(_('cannot read changes in %s') % version)
 
         return changes
+
+    def getbookmarks(self):
+        bookmarks = {}
+
+        # Interesting references in git are prefixed
+        prefix = 'refs/heads/'
+        prefixlen = len(prefix)
+
+        # factor two commands
+        gitcmd = { 'remote/': 'git ls-remote --heads origin',
+                          '': 'git show-ref'}
+
+        # Origin heads
+        for reftype in gitcmd:
+            try:
+                fh = self.gitopen(gitcmd[reftype], noerr=True)
+                for line in fh:
+                    line = line.strip()
+                    rev, name = line.split(None, 1)
+                    if not name.startswith(prefix):
+                        continue
+                    name = '%s%s' % (reftype, name[prefixlen:])
+                    bookmarks[name] = rev
+            except:
+                pass
+
+        return bookmarks

--- a/tests/test-convert-git.t	Thu Mar 24 15:12:51 2011 -0500
+++ b/tests/test-convert-git.t	Fri Mar 25 01:38:43 2011 +0100
@@ -57,9 +57,11 @@
   2 t4.1
   1 t4.2
   0 Merge branch other
+  updating bookmarks
   $ hg up -q -R git-repo-hg
   $ hg -R git-repo-hg tip -v
   changeset:   5:c78094926be2
+  bookmark:    master
   tag:         tip
   parent:      3:f5f5cb45432b
   parent:      4:4e174f80c67c
@@ -217,6 +219,7 @@
   sorting...
   converting...
   0 addbinary
+  updating bookmarks
   $ cd git-repo3-hg
   $ hg up -C
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
@@ -248,8 +251,10 @@
   converting...
   1 addfoo
   0 addfoo2
+  updating bookmarks
   $ hg -R git-repo4-hg log -v
   changeset:   1:d63e967f93da
+  bookmark:    master
   tag:         tip
   user:        nottest <[e-mail]>
   date:        Mon Jan 01 00:00:21 2007 +0000

--- a/tests/test-convert-tagsbranch-topology.t	Thu Mar 24 15:12:51 2011 -0500
+++ b/tests/test-convert-tagsbranch-topology.t	Fri Mar 25 01:38:43 2011 +0100
@@ -49,6 +49,7 @@
   converting...
   0 rev1
   updating tags
+  updating bookmarks
 
 Simulate upstream  updates after first conversion
 
@@ -67,6 +68,7 @@
   converting...
   0 rev2
   updating tags
+  updating bookmarks
 
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