merge(third_party/git): Merge squashed git subtree at v2.23.0

Merge commit '1b593e1ea4' as 'third_party/git'

third_party/git/t/t5507-remote-environment.sh

@@ -0,0 +1,34 @@
+#!/bin/sh
+
+test_description='check environment showed to remote side of transports'
+. ./test-lib.sh
+
+test_expect_success 'set up "remote" push situation' '
+	test_commit one &&
+	git config push.default current &&
+	git init remote
+'
+
+test_expect_success 'set up fake ssh' '
+	GIT_SSH_COMMAND="f() {
+		cd \"\$TRASH_DIRECTORY\" &&
+		eval \"\$2\"
+	}; f" &&
+	export GIT_SSH_COMMAND &&
+	export TRASH_DIRECTORY
+'
+
+# due to receive.denyCurrentBranch=true
+test_expect_success 'confirm default push fails' '
+	test_must_fail git push remote
+'
+
+test_expect_success 'config does not travel over same-machine push' '
+	test_must_fail git -c receive.denyCurrentBranch=false push remote
+'
+
+test_expect_success 'config does not travel over ssh push' '
+	test_must_fail git -c receive.denyCurrentBranch=false push host:remote
+'
+
+test_done