Revert "core.hooksPath: add some protection while cloning"

This defense-in-depth was intended to protect the clone operation
against future escalations where bugs in `git clone` would allow
attackers to write arbitrary files in the `.git/` directory would allow
for Remote Code Execution attacks via maliciously-placed hooks.

However, it turns out that the `core.hooksPath` protection has
unintentional side effects so severe that they do not justify the
benefit of the protections. For example, it has been reported in
https://lore.kernel.org/git/[email protected]/
that the following invocation, which is intended to make `git clone`
safer, is itself broken by that protective measure:

	git clone --config core.hooksPath=/dev/null <url>

Since it turns out that the benefit does not justify the cost, let's revert
20f3588 (core.hooksPath: add some protection while cloning,
2024-03-30).

Signed-off-by: Johannes Schindelin <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: dscho

config.c

@@ -1525,19 +1525,8 @@ static int git_default_core_config(const char *var, const char *value, void *cb)
 	if (!strcmp(var, "core.attributesfile"))
 		return git_config_pathname(&git_attributes_file, var, value);
 
-	if (!strcmp(var, "core.hookspath")) {
-		if (current_config_scope() == CONFIG_SCOPE_LOCAL &&
-		    git_env_bool("GIT_CLONE_PROTECTION_ACTIVE", 0))
-			die(_("active `core.hooksPath` found in the local "
-			      "repository config:\n\t%s\nFor security "
-			      "reasons, this is disallowed by default.\nIf "
-			      "this is intentional and the hook should "
-			      "actually be run, please\nrun the command "
-			      "again with "
-			      "`GIT_CLONE_PROTECTION_ACTIVE=false`"),
-			    value);
+	if (!strcmp(var, "core.hookspath"))
 		return git_config_pathname(&git_hooks_path, var, value);
-	}
 
 	if (!strcmp(var, "core.bare")) {
 		is_bare_repository_cfg = git_config_bool(var, value);

t/t1800-hook.sh

@@ -177,19 +177,4 @@ test_expect_success 'git hook run a hook with a bad shebang' '
 	test_cmp expect actual
 '
 
-test_expect_success 'clone protections' '
-	test_config core.hooksPath "$(pwd)/my-hooks" &&
-	mkdir -p my-hooks &&
-	write_script my-hooks/test-hook <<-\EOF &&
-	echo Hook ran $1
-	EOF
-
-	git hook run test-hook 2>err &&
-	grep "Hook ran" err &&
-	test_must_fail env GIT_CLONE_PROTECTION_ACTIVE=true \
-		git hook run test-hook 2>err &&
-	grep "active .core.hooksPath" err &&
-	! grep "Hook ran" err
-'
-
 test_done