From d35f0ffb7c33a11f8192ec64da5a736827ab472d Mon Sep 17 00:00:00 2001
From: David Ostrovsky <david@ostrovsky.org>
Date: Sun, 21 Jun 2020 16:56:57 +0200
Subject: [PATCH] Bazel: Add workspace status command to stamp final artifact

Include implementation version in jgit library. This version is used
by other products that depend on JGit, and built using Bazel and not
consume officially released artifact from Central or Eclipse own Maven
repository.

Most notably, in Gerrit Code Review JGit agent that was previously
reported as "unknown", is now reported as:

  JGit/v5.8.0.202006091008-r-16-g14c43828d

using this change [1].

[1] https://gerrit-review.googlesource.com/c/gerrit/+/272505

Change-Id: Ia50de9ac35b8dbe9e92d8ad7d0d14cd00f057863
Signed-off-by: David Ostrovsky <david@ostrovsky.org>
---
 .bazelrc                  |  1 +
 org.eclipse.jgit/BUILD    | 23 +++++++++++++++++++-
 tools/workspace_status.py | 45 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 68 insertions(+), 1 deletion(-)
 create mode 100644 tools/workspace_status.py

diff --git a/.bazelrc b/.bazelrc
index 3a61f8cb7..e24be8863 100644
--- a/.bazelrc
+++ b/.bazelrc
@@ -1,3 +1,4 @@
+build --workspace_status_command="python ./tools/workspace_status.py"
 build --repository_cache=~/.gerritcodereview/bazel-cache/repository
 build --experimental_strict_action_env
 build --action_env=PATH
diff --git a/org.eclipse.jgit/BUILD b/org.eclipse.jgit/BUILD
index f7970976b..208337224 100644
--- a/org.eclipse.jgit/BUILD
+++ b/org.eclipse.jgit/BUILD
@@ -14,7 +14,7 @@ SRCS = glob(
 RESOURCES = glob(["resources/**"])
 
 java_library(
-    name = "jgit",
+    name = "jgit_non_stamped",
     srcs = SRCS,
     resource_strip_prefix = "org.eclipse.jgit/resources",
     resources = RESOURCES,
@@ -25,6 +25,27 @@ java_library(
     ],
 )
 
+genrule(
+    name = "jgit",
+    srcs = [":jgit_non_stamped"],
+    outs = ["jgit.jar"],
+    cmd = " && ".join([
+        "ROOT=$$PWD",
+        "TMP=$$(mktemp -d || mktemp -d -t bazel-tmp)",
+        "TZ=UTC",
+        "export TZ",
+        "GEN_VERSION=$$(cat bazel-out/stable-status.txt | grep -w STABLE_BUILD_JGIT_LABEL | cut -d ' ' -f 2)",
+        "cd $$TMP",
+        "unzip -q $$ROOT/$<",
+        "echo \"Implementation-Version: $$GEN_VERSION\n$$(cat META-INF/MANIFEST.MF)\" > META-INF/MANIFEST.MF",
+        "find . -exec touch '{}' ';'",
+        "zip -Xqr $$ROOT/$@ .",
+        "rm -rf $$TMP",
+    ]),
+    stamp = 1,
+    visibility = ["//visibility:public"],
+)
+
 java_library(
     name = "insecure_cipher_factory",
     srcs = INSECURE_CIPHER_FACTORY,
diff --git a/tools/workspace_status.py b/tools/workspace_status.py
new file mode 100644
index 000000000..ca9e0a98c
--- /dev/null
+++ b/tools/workspace_status.py
@@ -0,0 +1,45 @@
+#!/usr/bin/env python
+# Copyright (C) 2020, David Ostrovsky <david@ostrovsky.org> and others
+#
+# This program and the accompanying materials are made available under the
+# terms of the Eclipse Distribution License v. 1.0 which is available at
+# http://www.eclipse.org/org/documents/edl-v10.php.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+
+# This script will be run by bazel when the build process starts to
+# generate key-value information that represents the status of the
+# workspace. The output should be like
+#
+# KEY1 VALUE1
+# KEY2 VALUE2
+#
+# If the script exits with non-zero code, it's considered as a failure
+# and the output will be discarded.
+
+from __future__ import print_function
+import os
+import subprocess
+import sys
+
+ROOT = os.path.abspath(__file__)
+while not os.path.exists(os.path.join(ROOT, 'WORKSPACE')):
+    ROOT = os.path.dirname(ROOT)
+CMD = ['git', 'describe', '--always', '--match', 'v[0-9].*', '--dirty']
+
+
+def revision(directory, parent):
+    try:
+        os.chdir(directory)
+        return subprocess.check_output(CMD).strip().decode("utf-8")
+    except OSError as err:
+        print('could not invoke git: %s' % err, file=sys.stderr)
+        sys.exit(1)
+    except subprocess.CalledProcessError as err:
+        # ignore "not a git repository error" to report unknown version
+        return None
+    finally:
+        os.chdir(parent)
+
+
+print("STABLE_BUILD_JGIT_LABEL %s" % revision(ROOT, ROOT))