patch.py: Prevent git repo reinitialization

There were few bugs in the _isInitialized() function which might trigger
git repo to be reinitialized and patches failing to apply.

(From OE-Core rev: 29d86bcad4fc43e09d7499c3f6fba8c499170b9b)

Signed-off-by: Pavel Zhukov <pavel.zhukov@huawei.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta-selftest/recipes-test/gitrepotest/gitrepotest.bb

@@ -0,0 +1,16 @@
+SUMMARY = "Test recipe for git repo initialization"
+HOMEPAGE = "https://git.yoctoproject.org/git/matchbox-panel-2"
+LICENSE = "GPL-2.0-or-later"
+LIC_FILES_CHKSUM = "file://COPYING;md5=94d55d512a9ba36caa9b7df079bae19f"
+
+INHIBIT_DEFAULT_DEPS = "1"
+
+PATCHTOOL="git"
+
+SRC_URI = "git://git.yoctoproject.org/git/matchbox-panel-2;branch=master;protocol=https \
+           file://0001-testpatch.patch \
+          "
+
+SRCREV = "f82ca3f42510fb3ef10f598b393eb373a2c34ca7"
+
+S = "${WORKDIR}/git"

meta-selftest/recipes-test/gitrepotest/gitrepotest/0001-testpatch.patch

@@ -0,0 +1,9 @@
+diff --git a/Makefile.am b/Makefile.am
+index 432a9b4..bbf7c74 100644
+--- a/Makefile.am
++++ b/Makefile.am
+@@ -1,3 +1,4 @@
++## This is useless comment to test if patch works
+ ACLOCAL_AMFLAGS = -I m4
+ 
+ SUBDIRS = matchbox-panel applets data po

meta/lib/oe/patch.py

@@ -304,14 +304,19 @@ class GitApplyTree(PatchTree):
 
     def _isInitialized(self):
         cmd = "git rev-parse --show-toplevel"
-        (status, output) = subprocess.getstatusoutput(cmd.split())
+        try:
+            output = runcmd(cmd.split(), self.dir).strip()
+        except CmdError as err:
+            ## runcmd returned non-zero which most likely means 128
+            ## Not a git directory
+            return False
         ## Make sure repo is in builddir to not break top-level git repos
-        return status == 0 and os.path.samedir(output, self.dir)
+        return os.path.samefile(output, self.dir)
 
     def _initRepo(self):
         runcmd("git init".split(), self.dir)
         runcmd("git add .".split(), self.dir)
-        runcmd("git commit -a --allow-empty -m Patching_started".split(), self.dir)
+        runcmd("git commit -a --allow-empty -m bitbake_patching_started".split(), self.dir)
 
     @staticmethod
     def extractPatchHeader(patchfile):

meta/lib/oeqa/selftest/cases/bbtests.py

@@ -310,8 +310,22 @@ INHERIT_remove = \"report-error\"
         src = get_bb_var("SRC_URI",test_recipe)
         gitscm = re.search("git://", src)
         self.assertFalse(gitscm, "test_git_patchtool pre-condition failed: {} test recipe contains git repo!".format(test_recipe))
-        result = bitbake('man-db -c patch', ignore_status=False)
+        result = bitbake('{} -c patch'.format(test_recipe), ignore_status=False)
         fatal = re.search("fatal: not a git repository (or any of the parent directories)", result.output)
         self.assertFalse(fatal, "Failed to patch using PATCHTOOL=\"git\"")
         self.delete_recipeinc(test_recipe)
-        bitbake('-cclean man-db')
+        bitbake('-cclean {}'.format(test_recipe))
+
+    def test_git_patchtool2(self):
+        """ Test if PATCHTOOL=git works with git repo and doesn't reinitialize it
+        """
+        test_recipe = "gitrepotest"
+        src = get_bb_var("SRC_URI",test_recipe)
+        gitscm = re.search("git://", src)
+        self.assertTrue(gitscm, "test_git_patchtool pre-condition failed: {} test recipe doesn't contains git repo!".format(test_recipe))
+        result = bitbake('{} -c patch'.format(test_recipe), ignore_status=False)
+        srcdir = get_bb_var('S', test_recipe)
+        result = runCmd("git log", cwd = srcdir)
+        self.assertFalse("bitbake_patching_started" in result.output, msg = "Repository has been reinitialized. {}".format(srcdir))
+        self.delete_recipeinc(test_recipe)
+        bitbake('-cclean {}'.format(test_recipe))