Say when --track is useful in the git-checkout docs.

diff --git a/run-command.c b/run-command.c
index eff523e191b35385895f6b077fc76c7c21819012..7e779d33ee9ea5f7d2e6aedc8c3a0a0476e87135 100644 (file)
--- a/run-command.c
+++ b/run-command.c
@@ -73,6 +73,17 @@ int start_command(struct child_process *cmd)
                        close(cmd->out);
                }
 
+               if (cmd->dir && chdir(cmd->dir))
+                       die("exec %s: cd to %s failed (%s)", cmd->argv[0],
+                           cmd->dir, strerror(errno));
+               if (cmd->env) {
+                       for (; *cmd->env; cmd->env++) {
+                               if (strchr(*cmd->env, '='))
+                                       putenv((char*)*cmd->env);
+                               else
+                                       unsetenv(*cmd->env);
+                       }
+               }
                if (cmd->git_cmd) {
                        execv_git_cmd(cmd->argv);
                } else {
@@ -133,13 +144,37 @@ int run_command(struct child_process *cmd)
        return finish_command(cmd);
 }
 
+static void prepare_run_command_v_opt(struct child_process *cmd,
+                                     const char **argv,
+                                     int opt)
+{
+       memset(cmd, 0, sizeof(*cmd));
+       cmd->argv = argv;
+       cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;
+       cmd->git_cmd = opt & RUN_GIT_CMD ? 1 : 0;
+       cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;
+}
+
 int run_command_v_opt(const char **argv, int opt)
 {
        struct child_process cmd;
-       memset(&cmd, 0, sizeof(cmd));
-       cmd.argv = argv;
-       cmd.no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;
-       cmd.git_cmd = opt & RUN_GIT_CMD ? 1 : 0;
-       cmd.stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;
+       prepare_run_command_v_opt(&cmd, argv, opt);
+       return run_command(&cmd);
+}
+
+int run_command_v_opt_cd(const char **argv, int opt, const char *dir)
+{
+       struct child_process cmd;
+       prepare_run_command_v_opt(&cmd, argv, opt);
+       cmd.dir = dir;
+       return run_command(&cmd);
+}
+
+int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env)
+{
+       struct child_process cmd;
+       prepare_run_command_v_opt(&cmd, argv, opt);
+       cmd.dir = dir;
+       cmd.env = env;
        return run_command(&cmd);
 }