[PATCH 3/6] BaseTools/Scripts: Add GitPostCommitHook.py

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

Git allows the use of various hooks (see [*]). In particular it
provides the 'post-commit' hook, which is a convenient place to
run the PatchCheck script.

[*] https://git-scm.com/book/en/v2/Customizing-Git-Git-Hooks

Cc: Bob Feng <bob.c.feng@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Signed-off-by: Philippe Mathieu-Daude <philmd@redhat.com>
---
I'm hitting a egg/chicken problem here.

If I add this script without CRLF, PatchCheck complains:

 Code format is not valid:
  * Line ending ('\n') is not CRLF
    File: BaseTools/Scripts/GitPostCommitHook.py
    Line: #!/usr/bin/python

However if I convert it to CRLF, then Linux does not recognize the
shebang, and if I symlink the script, when the hook is executed I get:

  fatal: cannot run .git/hooks/post-commit: No such file or directory

Because the interpreter expects the shebang line with Unix line ending
(linefeed only).

As a kludge I'm happy using:

  $ echo > .git/hooks/post-commit
  #!/bin/sh
  test -e BaseTools/Scripts/GitPostCommitHook.py && exec python3 BaseTools/Scripts/GitPostCommitHook.py
  EOF
  $ chmod +x .git/hooks/post-commit

(The 'test' allow to checkout to older references where the script
is not available).

Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Leif Lindholm <leif.lindholm@linaro.org>
---
 BaseTools/Scripts/GitPostCommitHook.py | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100755 BaseTools/Scripts/GitPostCommitHook.py

diff --git a/BaseTools/Scripts/GitPostCommitHook.py b/BaseTools/Scripts/GitPostCommitHook.py
new file mode 100755
index 000000000000..4ea933a7eedf
--- /dev/null
+++ b/BaseTools/Scripts/GitPostCommitHook.py
@@ -0,0 +1,21 @@
+#!/usr/bin/python
+## @file
+#  Run PatchCheck on the last commit.
+#
+#  Copyright (c) 2019, Red Hat, Inc.
+#
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+# To have git run this script after each commit, create a symbolic
+# link or copy it to .git/hooks/post-commit in your EDK2 repository.
+
+import os
+import sys
+
+if __name__ == '__main__':
+    sys.path.append(os.path.join(os.environ['EDK_TOOLS_PATH'], 'Scripts'))
+    from PatchCheck import CheckGitCommits, Verbose
+    Verbose.level = Verbose.QUIET
+    GIT_REFERENCE = 'HEAD'
+    COMMIT_COUNT = 1
+    sys.exit(CheckGitCommits(GIT_REFERENCE, COMMIT_COUNT).ok)
-- 
2.21.0