Add V8 releases script.

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
 
+
+class GitFailedException(Exception):
+  pass
+
+
 def Strip(f):
   def new_f(*args, **kwargs):
     return f(*args, **kwargs).strip()
   return new_f
 
 
 def MakeArgs(l):
   """['-a', '', 'abc', ''] -> '-a abc'"""
   return " ".join(filter(None, l))
 
@@ skipping 11 matching lines @@
     return self.Git("branch")
 
   def GitCreateBranch(self, name, branch=""):
     assert name
     self.Git(MakeArgs(["checkout -b", name, branch]))
 
   def GitDeleteBranch(self, name):
     assert name
     self.Git(MakeArgs(["branch -D", name]))
 
+  def GitReset(self, name):
+    assert name
+    self.Git(MakeArgs(["reset --hard", name]))
+
+  def GitRemotes(self):
+    return map(str.strip, self.Git(MakeArgs(["branch -r"])).splitlines())
+
   def GitCheckout(self, name):
     assert name
     self.Git(MakeArgs(["checkout -f", name]))
 
   def GitCheckoutFile(self, name, branch_or_hash):
     assert name
     assert branch_or_hash
     self.Git(MakeArgs(["checkout -f", branch_or_hash, "--", name]))
 
+  def GitCheckoutFileSafe(self, name, branch_or_hash):
+    try:
+      self.GitCheckoutFile(name, branch_or_hash)
+    except GitFailedException:  # pragma: no cover
+      # The file doesn't exist in that revision.
+      return False
+    return True
+
+  def GitChangedFiles(self, git_hash):
+    assert git_hash
+    try:
+      files = self.Git(MakeArgs(["diff --name-only",
+                                 git_hash,
+                                 "%s^" % git_hash]))
+      return map(str.strip, files.splitlines())
+    except GitFailedException:  # pragma: no cover
+      # Git fails using "^" at branch roots.
+      return []
+
+
   @Strip
   def GitCurrentBranch(self):
     for line in self.Git("status -s -b -uno").strip().splitlines():
       match = re.match(r"^## (.+)", line)
       if match: return match.group(1)
     raise Exception("Couldn't find curent branch.")  # pragma: no cover
 
   @Strip
   def GitLog(self, n=0, format="", grep="", git_hash="", parent_hash="",
              branch="", reverse=False):
@@ skipping 11 matching lines @@
       args.append(git_hash)
     if parent_hash:
       args.append("%s^" % parent_hash)
     args.append(branch)
     return self.Git(MakeArgs(args))
 
   def GitGetPatch(self, git_hash):
     assert git_hash
     return self.Git(MakeArgs(["log", "-1", "-p", git_hash]))
 
+  # TODO(machenbach): Unused? Remove.
   def GitAdd(self, name):
     assert name
     self.Git(MakeArgs(["add", Quoted(name)]))
 
   def GitApplyPatch(self, patch_file, reverse=False):
     assert patch_file
     args = ["apply --index --reject"]
     if reverse:
       args.append("--reverse")
     args.append(Quoted(patch_file))
@@ skipping 28 matching lines @@
 
   def GitDiff(self, loc1, loc2):
     return self.Git(MakeArgs(["diff", loc1, loc2]))
 
   def GitPull(self):
     self.Git("pull")
 
   def GitSVNFetch(self):
     self.Git("svn fetch")
 
+  # 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)