kc3-lang/angle/src/commit_id.py

• Show log

  Commit

• Hash : 955b4620
  Author :
  Date : 2021-07-01T22:55:59
  

  Fix angle_commit.h dependency when git packs refs
  
  If there are too many files in .git/refs/heads/, git packs them in
  .git/packed-refs.  This breaks the build as gen/angle/angle_commit.h
  depends on .git/refs/heads/<branch-name>.
  
  With this change, when gn is run and the dependency to this file is set
  up, it's unpacked from .git/packed-refs if it's missing from
  .git/refs/heads/.
  
  One corner case not solved by this change is if a commit is amended with
  no changes and git packs the refs (and so the
  .git/refs/heads/<branch-name> file goes away), ninja doesn't rerun gn as
  it doesn't believe there to be any changes, yet fails the build as the
  dependency is now missing.  Running `gn gen` manually fixes the issue.
  The issue is automatically fixed when switching branches.
  
  Bug: angleproject:6131
  Change-Id: Ie2404e874a5cb3374a652b93faa143acb68eaa19
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3001906
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
  

Download

• src/commit_id.py

• #!/usr/bin/env python
  #  Copyright 2018 The ANGLE Project Authors. All rights reserved.
  #  Use of this source code is governed by a BSD-style license that can be
  #  found in the LICENSE file.
  
  # Generate commit.h with git commit hash.
  #
  
  import subprocess as sp
  import sys
  import os
  
  usage = """\
  Usage: commit_id.py check                - check if git is present
         commit_id.py unpack <ref_file>    - check if <ref_file> exists, and if not
                                             create it based on .git/packed-refs
         commit_id.py position             - print commit position
         commit_id.py gen <file_to_write>  - generate commit.h"""
  
  
  def grab_output(command, cwd):
      return sp.Popen(
          command, stdout=sp.PIPE, shell=True, cwd=cwd).communicate()[0].strip().decode('utf-8')
  
  
  def get_commit_position(cwd):
      return grab_output('git rev-list HEAD --count', cwd)
  
  
  def unpack_ref(ref_file, ref_file_full_path, packed_refs_full_path):
  
      with open(packed_refs_full_path) as fin:
          refs = fin.read().strip().split('\n')
  
      # Strip comments
      refs = [ref.split(' ') for ref in refs if ref.strip()[0] != '#']
  
      # Parse lines (which are in the format <hash> <ref_file>) and find the input file
      refs = [git_hash for (git_hash, file_path) in refs if file_path == ref_file]
  
      assert (len(refs) == 1)
      git_hash = refs[0]
  
      with open(ref_file_full_path, 'w') as fout:
          fout.write(git_hash + '\n')
  
  
  if len(sys.argv) < 2:
      sys.exit(usage)
  
  operation = sys.argv[1]
  
  # Set the root of ANGLE's repo as the working directory
  cwd = os.path.join(os.path.dirname(os.path.realpath(__file__)), '..')
  aosp_angle_path = os.path.join(os.path.dirname('.'), 'external', 'angle')
  if os.path.exists(aosp_angle_path):
      cwd = aosp_angle_path
  
  git_dir_exists = os.path.exists(os.path.join(cwd, '.git', 'HEAD'))
  
  if operation == 'check':
      if git_dir_exists:
          print("1")
      else:
          print("0")
      sys.exit(0)
  elif operation == 'unpack':
      if len(sys.argv) < 3:
          sys.exit(usage)
  
      ref_file = sys.argv[2]
      ref_file_full_path = os.path.join(cwd, '.git', ref_file)
      ref_file_exists = os.path.exists(ref_file_full_path)
  
      if not ref_file_exists:
          packed_refs_full_path = os.path.join(cwd, '.git', 'packed-refs')
          unpack_ref(ref_file, ref_file_full_path, packed_refs_full_path)
  
      sys.exit(0)
  elif operation == 'position':
      if git_dir_exists:
          print(get_commit_position(cwd))
      else:
          print("0")
      sys.exit(0)
  
  if len(sys.argv) < 3 or operation != 'gen':
      sys.exit(usage)
  
  output_file = sys.argv[2]
  commit_id_size = 12
  commit_id = 'unknown hash'
  commit_date = 'unknown date'
  commit_position = '0'
  enable_binary_loading = False
  
  if git_dir_exists:
      try:
          commit_id = grab_output('git rev-parse --short=%d HEAD' % commit_id_size, cwd)
          commit_date = grab_output('git show -s --format=%ci HEAD', cwd)
          commit_position = get_commit_position(cwd)
          enable_binary_loading = True
      except:
          pass
  
  hfile = open(output_file, 'w')
  
  hfile.write('#define ANGLE_COMMIT_HASH "%s"\n' % commit_id)
  hfile.write('#define ANGLE_COMMIT_HASH_SIZE %d\n' % commit_id_size)
  hfile.write('#define ANGLE_COMMIT_DATE "%s"\n' % commit_date)
  hfile.write('#define ANGLE_COMMIT_POSITION %s\n' % commit_position)
  
  if not enable_binary_loading:
      hfile.write('#define ANGLE_DISABLE_PROGRAM_BINARY_LOAD\n')
  
  hfile.close()
  

Download