git-svn: handle our top-level path being deleted and later re-added

diff --git a/run-command.c b/run-command.c
index eff523e191b35385895f6b077fc76c7c21819012..476d00c2182e3af82a0cfe495c61c9df1eb44d26 100644 (file)
--- a/run-command.c
+++ b/run-command.c
@@ -17,8 +17,8 @@ static inline void dup_devnull(int to)
 
 int start_command(struct child_process *cmd)
 {
-       int need_in, need_out;
-       int fdin[2], fdout[2];
+       int need_in, need_out, need_err;
+       int fdin[2], fdout[2], fderr[2];
 
        need_in = !cmd->no_stdin && cmd->in < 0;
        if (need_in) {
@@ -41,12 +41,26 @@ int start_command(struct child_process *cmd)
                cmd->close_out = 1;
        }
 
+       need_err = !cmd->no_stderr && cmd->err < 0;
+       if (need_err) {
+               if (pipe(fderr) < 0) {
+                       if (need_in)
+                               close_pair(fdin);
+                       if (need_out)
+                               close_pair(fdout);
+                       return -ERR_RUN_COMMAND_PIPE;
+               }
+               cmd->err = fderr[0];
+       }
+
        cmd->pid = fork();
        if (cmd->pid < 0) {
                if (need_in)
                        close_pair(fdin);
                if (need_out)
                        close_pair(fdout);
+               if (need_err)
+                       close_pair(fderr);
                return -ERR_RUN_COMMAND_FORK;
        }
 
@@ -73,6 +87,24 @@ int start_command(struct child_process *cmd)
                        close(cmd->out);
                }
 
+               if (cmd->no_stderr)
+                       dup_devnull(2);
+               else if (need_err) {
+                       dup2(fderr[1], 2);
+                       close_pair(fderr);
+               }
+
+               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 {
@@ -91,19 +123,17 @@ int start_command(struct child_process *cmd)
        else if (cmd->out > 1)
                close(cmd->out);
 
+       if (need_err)
+               close(fderr[1]);
+
        return 0;
 }
 
-int finish_command(struct child_process *cmd)
+static int wait_or_whine(pid_t pid)
 {
-       if (cmd->close_in)
-               close(cmd->in);
-       if (cmd->close_out)
-               close(cmd->out);
-
        for (;;) {
                int status, code;
-               pid_t waiting = waitpid(cmd->pid, &status, 0);
+               pid_t waiting = waitpid(pid, &status, 0);
 
                if (waiting < 0) {
                        if (errno == EINTR)
@@ -111,7 +141,7 @@ int finish_command(struct child_process *cmd)
                        error("waitpid failed (%s)", strerror(errno));
                        return -ERR_RUN_COMMAND_WAITPID;
                }
-               if (waiting != cmd->pid)
+               if (waiting != pid)
                        return -ERR_RUN_COMMAND_WAITPID_WRONG_PID;
                if (WIFSIGNALED(status))
                        return -ERR_RUN_COMMAND_WAITPID_SIGNAL;
@@ -125,6 +155,15 @@ int finish_command(struct child_process *cmd)
        }
 }
 
+int finish_command(struct child_process *cmd)
+{
+       if (cmd->close_in)
+               close(cmd->in);
+       if (cmd->close_out)
+               close(cmd->out);
+       return wait_or_whine(cmd->pid);
+}
+
 int run_command(struct child_process *cmd)
 {
        int code = start_command(cmd);
@@ -133,13 +172,68 @@ 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);
 }
+
+int start_async(struct async *async)
+{
+       int pipe_out[2];
+
+       if (pipe(pipe_out) < 0)
+               return error("cannot create pipe: %s", strerror(errno));
+
+       async->pid = fork();
+       if (async->pid < 0) {
+               error("fork (async) failed: %s", strerror(errno));
+               close_pair(pipe_out);
+               return -1;
+       }
+       if (!async->pid) {
+               close(pipe_out[0]);
+               exit(!!async->proc(pipe_out[1], async->data));
+       }
+       async->out = pipe_out[0];
+       close(pipe_out[1]);
+       return 0;
+}
+
+int finish_async(struct async *async)
+{
+       int ret = 0;
+
+       if (wait_or_whine(async->pid))
+               ret = error("waitpid (async) failed");
+       return ret;
+}