Start defining a more sophisticated run_command

There are a number of places where we do some variation of
fork()+exec() but we also need to setup redirection in the process,
much like what run_command does for us already with its option flags.

It would be nice to reuse more of the run_command logic, especially
as that non-fork API helps us to port to odd platforms like Win32.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/run-command.c b/run-command.c
index 94ace50a252e662d70f8a4c8eed6b0019ea487dd..1fb7fa5a8d6e0fb89d41a1b05e344bc62463926f 100644 (file)
--- a/run-command.c
+++ b/run-command.c
@@ -2,26 +2,26 @@
 #include "run-command.h"
 #include "exec_cmd.h"
 
-int run_command_v_opt(const char **argv, int flags)
+int run_command(struct child_process *cmd)
 {
        pid_t pid = fork();
 
        if (pid < 0)
                return -ERR_RUN_COMMAND_FORK;
        if (!pid) {
-               if (flags & RUN_COMMAND_NO_STDIN) {
+               if (cmd->no_stdin) {
                        int fd = open("/dev/null", O_RDWR);
                        dup2(fd, 0);
                        close(fd);
                }
-               if (flags & RUN_COMMAND_STDOUT_TO_STDERR)
+               if (cmd->stdout_to_stderr)
                        dup2(2, 1);
-               if (flags & RUN_GIT_CMD) {
-                       execv_git_cmd(argv);
+               if (cmd->git_cmd) {
+                       execv_git_cmd(cmd->argv);
                } else {
-                       execvp(argv[0], (char *const*) argv);
+                       execvp(cmd->argv[0], (char *const*) cmd->argv);
                }
-               die("exec %s failed.", argv[0]);
+               die("exec %s failed.", cmd->argv[0]);
        }
        for (;;) {
                int status, code;
@@ -46,3 +46,14 @@ int run_command_v_opt(const char **argv, int flags)
                return 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;
+       return run_command(&cmd);
+}

diff --git a/run-command.h b/run-command.h
index 2646d38ac7d3b4f301744fd61732e7c437ea80a5..f9db2a7f8cc0462f3a2b5a8edf95348259990010 100644 (file)
--- a/run-command.h
+++ b/run-command.h
@@ -10,6 +10,15 @@ enum {
        ERR_RUN_COMMAND_WAITPID_NOEXIT,
 };
 
+struct child_process {
+       const char **argv;
+       unsigned no_stdin:1;
+       unsigned git_cmd:1; /* if this is to be git sub-command */
+       unsigned stdout_to_stderr:1;
+};
+
+int run_command(struct child_process *);
+
 #define RUN_COMMAND_NO_STDIN 1
 #define RUN_GIT_CMD         2  /*If this is to be git sub-command */
 #define RUN_COMMAND_STDOUT_TO_STDERR 4