extern const struct pb_system_apps pb_system_apps;
int pb_run_cmd(const char *const *cmd_argv, int wait, int dry_run);
-int pb_run_cmd_pipe(const char *const *cmd_argv, int wait, int dry_run,
- void *ctx, char **buf, int *buf_len);
int pb_mkdir_recursive(const char *dir);
int pb_rmdir_recursive(const char *base, const char *dir);