thodg/libgit2

diff --git a/tests-clar/clar b/tests-clar/clar
index 4d10d85..7634b2c 100755
--- a/tests-clar/clar
+++ b/tests-clar/clar
@@ -338,7 +338,7 @@ CLAR_FILES = {
 "clar_print_tap.c" : r"""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""",
 "clar_sandbox.c" : r"""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""",
 "clar_fixtures.c" : r"""eJyFUV1LwzAUfW5+xZU9rLUVJ4ggZQ9DFAUfZEwQSglZmrBAl5Qkk6n43236tWbKfMvNOfecc+81llhBgSppLNAN0XCOuNjbnWa4InYTjpE1MSzxuD1Vki2L0BcKTKfn0EYgu57d3uRpjYhPhi1opSwumUwRCvo3zMFYXT9C5xA5stWSVh9hI5FAa+wUFG//osgJCA5tmQ1SF3CVw9kcppfTCAWBj8ZxDg3UN4/zZ7MaHBrHSBw7vpcJ4mGS5Ijtai9qnannNqk1q7myXU+KvhGaCF4wDnfPiyV+eHpbvS7v8cti9YjGq6Yl7lzCkxfo1L0j/lJOwOtrUrwrUcDBBRsii7Xan3bjBlNVL2WUzuMkgGlJdLuIP21oyYjcVf/a6G3ozXTQPRqmsZkwWQiOfgAVGffP""",
-"clar_fs.c" : r"""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""",
+"clar_fs.c" : r"""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""",
 "clar_categorize.c" : r"""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""",
 "clar.h" : r"""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"""
 }
diff --git a/tests-clar/clar_helpers.c b/tests-clar/clar_helpers.c
index f0ce37c..647ea52 100644
--- a/tests-clar/clar_helpers.c
+++ b/tests-clar/clar_helpers.c
@@ -92,6 +92,37 @@ int cl_setenv(const char *name, const char *value)
 	cl_assert(SetEnvironmentVariableW(name_utf16, value ? value_utf16 : NULL));
 	return 0;
 }
+
+/* This function performs retries on calls to MoveFile in order
+ * to provide enhanced reliability in the face of antivirus
+ * agents that may be scanning the source (or in the case that
+ * the source is a directory, a child of the source). */
+int cl_rename(const char *source, const char *dest)
+{
+	wchar_t source_utf16[GIT_WIN_PATH];
+	wchar_t dest_utf16[GIT_WIN_PATH];
+	unsigned retries = 1;
+
+	git__utf8_to_16(source_utf16, GIT_WIN_PATH, source);
+	git__utf8_to_16(dest_utf16, GIT_WIN_PATH, dest);
+
+	while (!MoveFileW(source_utf16, dest_utf16)) {
+		/* Only retry if the error is ERROR_ACCESS_DENIED;
+		 * this may indicate that an antivirus agent is
+		 * preventing the rename from source to target */
+		if (retries > 5 ||
+			ERROR_ACCESS_DENIED != GetLastError())
+			return -1;
+
+		/* With 5 retries and a coefficient of 10ms, the maximum
+		 * delay here is 550 ms */
+		Sleep(10 * retries * retries);
+		retries++;
+	}
+
+	return 0;
+}
+
 #else
 
 #include <stdlib.h>
@@ -104,6 +135,12 @@ int cl_setenv(const char *name, const char *value)
 {
 	return (value == NULL) ? unsetenv(name) : setenv(name, value, 1);
 }
+
+int cl_rename(const char *source, const char *dest)
+{
+	return p_rename(source, dest);
+}
+
 #endif
 
 static const char *_cl_sandbox = NULL;
@@ -124,18 +161,18 @@ git_repository *cl_git_sandbox_init(const char *sandbox)
 	 * named `.git` inside the fixtures folder of our libgit2 repo.
 	 */
 	if (p_access(".gitted", F_OK) == 0)
-		cl_git_pass(p_rename(".gitted", ".git"));
+		cl_git_pass(cl_rename(".gitted", ".git"));
 
 	/* If we have `gitattributes`, rename to `.gitattributes`.  This may
 	 * be necessary if we don't want the attributes to be applied in the
 	 * libgit2 repo, but just during testing.
 	 */
 	if (p_access("gitattributes", F_OK) == 0)
-		cl_git_pass(p_rename("gitattributes", ".gitattributes"));
+		cl_git_pass(cl_rename("gitattributes", ".gitattributes"));
 
 	/* As with `gitattributes`, we may need `gitignore` just for testing. */
 	if (p_access("gitignore", F_OK) == 0)
-		cl_git_pass(p_rename("gitignore", ".gitignore"));
+		cl_git_pass(cl_rename("gitignore", ".gitignore"));
 
 	cl_git_pass(p_chdir(".."));
 
diff --git a/tests-clar/clar_libgit2.h b/tests-clar/clar_libgit2.h
index b4ee74c..ce3688e 100644
--- a/tests-clar/clar_libgit2.h
+++ b/tests-clar/clar_libgit2.h
@@ -49,6 +49,9 @@ bool cl_is_chmod_supported(void);
 char *cl_getenv(const char *name);
 int cl_setenv(const char *name, const char *value);
 
+/* Reliable rename */
+int cl_rename(const char *source, const char *dest);
+
 /* Git sandbox setup helpers */
 
 git_repository *cl_git_sandbox_init(const char *sandbox);