Teach v8rel script to read git hashes from DEPS.

tools/push-to-trunk/git_recipes.py

 #!/usr/bin/env python
 # Copyright 2014 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
@@ skipping 10 matching lines @@
 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 import re
 
+SHA1_RE = re.compile('^[a-fA-F0-9]{40}$')
+GIT_SVN_ID_RE = re.compile('^git-svn-id: .*@([0-9]+) .*$')
+
 
 class GitFailedException(Exception):
   pass
 
 
 def Strip(f):
   def new_f(*args, **kwargs):
     return f(*args, **kwargs).strip()
   return new_f
 
@@ skipping 137 matching lines @@
 
   def GitDCommit(self):
     self.Git("cl dcommit -f --bypass-hooks", retry_on=lambda x: x is None)
 
   def GitDiff(self, loc1, loc2):
     return self.Git(MakeArgs(["diff", loc1, loc2]))
 
   def GitPull(self):
     self.Git("pull")
 
+  def GitFetchOrigin(self):
+    self.Git("fetch origin")
+
+  def GitConvertToSVNRevision(self, git_hash):
+    result = self.Git(MakeArgs(["rev-list", "-n", "1", git_hash]))
+    if not result or not SHA1_RE.match(result):
+      raise GitFailedException("Git hash %s is unknown." % git_hash)
+    log = self.GitLog(n=1, format="%B", git_hash=git_hash)
+    for line in reversed(log.splitlines()):
+      match = GIT_SVN_ID_RE.match(line.strip())
+      if match:
+        return match.group(1)
+    raise GitFailedException("Couldn't convert %s to SVN." % git_hash)
+
   def GitSVNFetch(self):
     self.Git("svn fetch")
 
   def GitSVNRebase(self):
     self.Git("svn rebase")
 
   # TODO(machenbach): Unused? Remove.
   @Strip
   def GitSVNLog(self):
     return self.Git("svn log -1 --oneline")
 
   @Strip
   def GitSVNFindGitHash(self, revision, branch=""):
     assert revision
     return self.Git(MakeArgs(["svn find-rev", "r%s" % revision, branch]))
 
   @Strip
   def GitSVNFindSVNRev(self, git_hash, branch=""):
     return self.Git(MakeArgs(["svn find-rev", git_hash, branch]))
 
   def GitSVNDCommit(self):
     return self.Git("svn dcommit 2>&1", retry_on=lambda x: x is None)
 
   def GitSVNTag(self, version):
     self.Git(("svn tag %s -m \"Tagging version %s\"" % (version, version)),
              retry_on=lambda x: x is None)