[PATCH] git.c: prevent change of environment variables

[Alexander Kuleshov <kuleshovmail@gmail.com>]

We can't change environment variables in aliases which doesn't start with '!'

* 'git --exec-path=path' changes $GIT_EXEC_PATH variable in
git_set_argv_exec_path

* 'git -p/--paginate' sets 'use_pager' to 1 and commit_pager_choice
will change $GIT_PAGER_IN_USE variable in setup_pager(void) from pager.c

* 'git -c' calls git_config_push_parameter which will change
$GIT_CONFIG_PARAMETERS variable

Signed-off-by: Alexander Kuleshov <kuleshovmail@gmail.com>
---
 git.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/git.c b/git.c
index c9bec99..3e87f05 100644
--- a/git.c
+++ b/git.c
@@ -89,8 +89,11 @@ static int handle_options(const char ***argv, int *argc, int *envchanged)
 		 * Check remaining flags.
 		 */
 		if (skip_prefix(cmd, "--exec-path", &cmd)) {
-			if (*cmd == '=')
+			if (*cmd == '=') {
 				git_set_argv_exec_path(cmd + 1);
+				if (envchanged)
+					*envchanged = 1;
+			}
 			else {
 				puts(git_exec_path());
 				exit(0);
@@ -106,6 +109,8 @@ static int handle_options(const char ***argv, int *argc, int *envchanged)
 			exit(0);
 		} else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
 			use_pager = 1;
+			if (envchanged)
+				*envchanged = 1;
 		} else if (!strcmp(cmd, "--no-pager")) {
 			use_pager = 0;
 			if (envchanged)
@@ -171,6 +176,8 @@ static int handle_options(const char ***argv, int *argc, int *envchanged)
 				usage(git_usage_string);
 			}
 			git_config_push_parameter((*argv)[1]);
+			if (envchanged)
+				*envchanged = 1;
 			(*argv)++;
 			(*argc)--;
 		} else if (!strcmp(cmd, "--literal-pathspecs")) {
-- 
2.2.1.531.g5addc96.dirty