From 1c49eff9ca32970e8f38eeab634b6148d7f140c2 Mon Sep 17 00:00:00 2001
From: Wez Furlong <wez@fb.com>
Date: Fri, 3 May 2019 15:52:39 -0700
Subject: [PATCH] fbcode_builder: getdeps: add fetch subcommand

Summary:
Adds a command that can be used to trigger a fetch for a project

```
$  ./opensource/fbcode_builder/getdeps.py fetch zstd
Cloning https://github.com/facebook/zstd.git...
 ---
+ git clone --depth=100 https://github.com/facebook/zstd.git /data/users/wez/scratch/dataZusersZwezZfbsource/fbcode_builder_getdeps/repos/github.com-facebook-zstd.git
Cloning into '/data/users/wez/scratch/dataZusersZwezZfbsource/fbcode_builder_getdeps/repos/github.com-facebook-zstd.git'...
remote: Enumerating objects: 3816, done.
remote: Counting objects: 100% (3816/3816), done.
remote: Compressing objects: 100% (1415/1415), done.
remote: Total 3816 (delta 2556), reused 3312 (delta 2288), pack-reused 0
Receiving objects: 100% (3816/3816), 2.93 MiB | 9.59 MiB/s, done.
Resolving deltas: 100% (2556/2556), done.
Updating /data/users/wez/scratch/dataZusersZwezZfbsource/fbcode_builder_getdeps/repos/github.com-facebook-zstd.git -> v1.3.8
 ---
+ git -C /data/users/wez/scratch/dataZusersZwezZfbsource/fbcode_builder_getdeps/repos/github.com-facebook-zstd.git fetch origin v1.3.8
From https://github.com/facebook/zstd
 * tag               v1.3.8     -> FETCH_HEAD
 ---
+ git -C /data/users/wez/scratch/dataZusersZwezZfbsource/fbcode_builder_getdeps/repos/github.com-facebook-zstd.git checkout FETCH_HEAD
Note: checking out 'FETCH_HEAD'.

You are in 'detached HEAD' state. You can look around, make experimental
changes and commit them, and you can discard any commits you make in this
state without impacting any branches by performing another checkout.

If you want to create a new branch to retain commits you create, you may
do so (now or later) by using -b with the checkout command again. Example:

  git checkout -b <new-branch-name>

HEAD is now at 470344d Merge pull request #1479 from facebook/visualTest
 ---
+ git -C /data/users/wez/scratch/dataZusersZwezZfbsource/fbcode_builder_getdeps/repos/github.com-facebook-zstd.git submodule update --init
```

Reviewed By: simpkins

Differential Revision: D14691008

fbshipit-source-id: 3afa391360518a08ebd6ff97f5b8b4993f10c4e8
---
 build/fbcode_builder/getdeps.py      | 21 +++++++++++++++++++++
 build/fbcode_builder/getdeps/load.py | 19 +++++++++++++++++++
 2 files changed, 40 insertions(+)
 create mode 100644 build/fbcode_builder/getdeps/load.py

diff --git a/build/fbcode_builder/getdeps.py b/build/fbcode_builder/getdeps.py
index 1046397fc..0fde4c749 100755
--- a/build/fbcode_builder/getdeps.py
+++ b/build/fbcode_builder/getdeps.py
@@ -14,6 +14,8 @@ import os
 import subprocess
 import sys
 
+from getdeps.buildopts import setup_build_options
+from getdeps.load import resolve_manifest_path
 from getdeps.manifest import ManifestParser
 from getdeps.platform import HostType
 from getdeps.subcmd import SubCmd, add_subcommands, cmd
@@ -45,6 +47,25 @@ class ShowHostType(SubCmd):
         return 0
 
 
+@cmd("fetch", "fetch the code for a given project")
+class FetchCmd(SubCmd):
+    def setup_parser(self, parser):
+        parser.add_argument(
+            "project",
+            help=(
+                "name of the project or path to a manifest "
+                "file describing the project"
+            ),
+        )
+
+    def run(self, args):
+        opts = setup_build_options(args)
+        manifest_path = resolve_manifest_path(opts, args.project)
+        manifest = ManifestParser(manifest_path)
+        fetcher = manifest.create_fetcher(opts, ctx={})
+        fetcher.update()
+
+
 def build_argparser():
     common_args = argparse.ArgumentParser(add_help=False)
     common_args.add_argument(
diff --git a/build/fbcode_builder/getdeps/load.py b/build/fbcode_builder/getdeps/load.py
new file mode 100644
index 000000000..ffbca2b92
--- /dev/null
+++ b/build/fbcode_builder/getdeps/load.py
@@ -0,0 +1,19 @@
+# Copyright (c) 2019-present, Facebook, Inc.
+# All rights reserved.
+#
+# This source code is licensed under the BSD-style license found in the
+# LICENSE file in the root directory of this source tree. An additional grant
+# of patent rights can be found in the PATENTS file in the same directory.
+
+from __future__ import absolute_import, division, print_function, unicode_literals
+
+import os
+
+
+def resolve_manifest_path(build_opts, project_name):
+    if "/" in project_name or "\\" in project_name:
+        # Assume this is a path already
+        return project_name
+
+    # Otherwise, resolve it relative to the manifests dir
+    return os.path.join(build_opts.fbcode_builder_dir, "manifests", project_name)