Merge branch 'bw/cp-a-is-gnuism'

* bw/cp-a-is-gnuism:
  tests: "cp -a" is a GNUism
diff --git a/t/t5400-send-pack.sh b/t/t5400-send-pack.sh
index 78ab177..129fc88 100755
--- a/t/t5400-send-pack.sh
+++ b/t/t5400-send-pack.sh
@@ -159,7 +159,7 @@
 	    git commit -a -m "Second commit" &&
 	    git repack
 	) &&
-	cp -a parent child &&
+	cp -R parent child &&
 	(
 	    # Set the child to auto-pack if more than one pack exists
 	    cd child &&
diff --git a/t/t5550-http-fetch.sh b/t/t5550-http-fetch.sh
index 16ef041..80d20c8 100755
--- a/t/t5550-http-fetch.sh
+++ b/t/t5550-http-fetch.sh
@@ -22,7 +22,7 @@
 '
 
 test_expect_success 'create http-accessible bare repository with loose objects' '
-	cp -a .git "$HTTPD_DOCUMENT_ROOT_PATH/repo.git" &&
+	cp -R .git "$HTTPD_DOCUMENT_ROOT_PATH/repo.git" &&
 	(cd "$HTTPD_DOCUMENT_ROOT_PATH/repo.git" &&
 	 git config core.bare true &&
 	 mkdir -p hooks &&
diff --git a/t/t5800-remote-helpers.sh b/t/t5800-remote-helpers.sh
index 5702334..e7dc668 100755
--- a/t/t5800-remote-helpers.sh
+++ b/t/t5800-remote-helpers.sh
@@ -76,7 +76,7 @@
 # git-remote-testgit, but is too slow to leave in for general use.
 : test_expect_success 'racily pushing to local repo' '
 	test_when_finished "rm -rf server2 localclone2" &&
-	cp -a server server2 &&
+	cp -R server server2 &&
 	git clone "testgit::${PWD}/server2" localclone2 &&
 	(cd localclone2 &&
 	echo content >>file &&