Add run_command_v_opt_cd: chdir into a directory before exec

It can make code simplier (no need to preserve cwd) and safer
(no chance the cwd of the current process is accidentally forgotten).

Signed-off-by: Alex Riesen <raa.lkml@gmail.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/run-command.c b/run-command.c
index eff523e191b35385895f6b077fc76c7c21819012..043b5701a1bb888b5b4fce9299b9dc28c176d09e 100644 (file)
--- a/run-command.c
+++ b/run-command.c
@@ -73,6 +73,9 @@ 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->git_cmd) {
                        execv_git_cmd(cmd->argv);
                } else {
@@ -133,13 +136,27 @@ 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);
 }

diff --git a/run-command.h b/run-command.h
index 3680ef9d452490c67788b0ab027839a8383ed855..cbd7484a00387ad039f4b713469a0663ab7c0a69 100644 (file)
--- a/run-command.h
+++ b/run-command.h
@@ -16,6 +16,7 @@ struct child_process {
        pid_t pid;
        int in;
        int out;
+       const char *dir;
        unsigned close_in:1;
        unsigned close_out:1;
        unsigned no_stdin:1;
@@ -32,5 +33,6 @@ int run_command(struct child_process *);
 #define RUN_GIT_CMD         2  /*If this is to be git sub-command */
 #define RUN_COMMAND_STDOUT_TO_STDERR 4
 int run_command_v_opt(const char **argv, int opt);
+int run_command_v_opt_cd(const char **argv, int opt, const char *dir);
 
 #endif