bin/sync-and-gyp: start using gclient

bin/sync-and-gyp

Index: bin/sync-and-gyp
diff --git a/bin/sync-and-gyp b/bin/sync-and-gyp
index 80dead97583504399f7cbe32b5692482eba1dbd7..b57843abbef50c5571c9e24830b6c52304b50cdb 100755
--- a/bin/sync-and-gyp
+++ b/bin/sync-and-gyp
@@ -8,10 +8,12 @@
 # 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
@@ -41,9 +43,35 @@ 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()