bin/sync-and-gyp: start using gclient

bin/sync-and-gyp

 #!/usr/bin/env python
 
 # Copyright 2015 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # This script will update Skia's dependencies as necessary and run
 # gyp if needed.
 
-# Depends on: Python, and Git.
+# Depends on: Python, Git, and depot_tools.
 #
 # Example usage:
 #
+#   git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
+#   export PATH="${PWD}/depot_tools:${PATH}"
 #   git clone https://skia.googlesource.com/skia
 #   cd skia
 #   python bin/sync-and-gyp
 #   ninja -C out/Debug && out/Debug/dm
 #
 # Once changes are made to DEPS or gyp/ or the source, call:
 #
 #   python bin/sync-and-gyp
 
 import fnmatch
 import hashlib
 import subprocess
 import os
 
 skia_dir = os.path.join(os.path.dirname(__file__), os.pardir)
 
 skia_out = os.environ.get("SKIA_OUT")
 if skia_out:
   skia_out = os.path.abspath(skia_out)
   hash_path = os.path.join(skia_out, 'gyp_hash')
 else:
   hash_path = os.path.join('out', 'gyp_hash')
 
 os.chdir(skia_dir)
 
 if not os.path.isfile('DEPS'):
   sys.stderr.write('DEPS file missing')
   exit(1)
 
-env = os.environ.copy()
-env["GIT_SYNC_DEPS_QUIET"] = "1"
-subprocess.call(['python', 'tools/git-sync-deps'], env=env)

[scroggo, 2016/02/16 15:02:42]

Should we also delete tools/git-sync-deps?

[hal.canary, 2016/02/16 15:43:44]

Maybe.  Let's do that in another CL, in case someone is relying on it.

+deps_hasher = hashlib.sha1()
+with open('DEPS', 'r') as f:
+  deps_hasher.update(f.read())
+deps_hash = deps_hasher.hexdigest()
+current_deps_hash = None
+if os.path.isfile('.deps_sha1'):
+  with open('.deps_sha1', 'r') as f:
+    current_deps_hash = f.read().strip()
+
+gclient_config = '''

[scroggo, 2016/02/16 15:02:42]

Why not use the existing gclient config? Mine is slightly different from this
one - it includes the line:

target_os = ['android']

which downloads the Android toolchains, etc.

[mtklein, 2016/02/16 15:32:05]

Nah, target_os = ['android'] doesn't actually do anything right now.  Toolchains
download on first use.

[hal.canary, 2016/02/16 15:43:44]

okay.  I'll check to see if the file exists first.

+solutions = [
+  { "name"        : ".",
+    "url"         : "https://skia.googlesource.com/skia.git",
+    "deps_file"   : "DEPS",
+    "managed"     : False,
+    "custom_deps" : {
+    },
+    "safesync_url": "",
+  },
+]
+cache_dir = None
+'''
+if current_deps_hash != deps_hash:
+  # `gclient sync` is very slow, so skip whenver we can

[scroggo, 2016/02/16 15:02:42]

whenever*

[hal.canary, 2016/02/16 15:43:44]

done

+  with open('.gclient', 'w') as o:
+    o.write(gclient_config)
+  subprocess.call(['gclient', 'sync'])
+  with open('.deps_sha1', 'w') as o:
+    o.write(deps_hash)
 
 hasher = hashlib.sha1()
 
 for var in ['AR', 'AR_host', 'AR_target',
             'CC', 'CC_host', 'CC_target',
             'CFLAGS', 'CFLAGS_host',
             'CPPFLAGS', 'CPPFLAGS_host',
             'CXX', 'CXX_host', 'CXX_target',
             'GYP_DEFINES', 'GYP_GENERATORS',
             'NM', 'NM_host', 'NM_target',
@@ skipping 22 matching lines @@
       return f.read()
   return ''
 
 if cat_if_exists(hash_path).strip() != gyp_hash:
   env = os.environ.copy()
   if skia_out:
     env['SKIA_OUT'] = skia_out
   subprocess.call(['python', './gyp_skia'], env=env)
   with open(hash_path, 'w') as o:
     o.write(gyp_hash)