1 files changed, 113 insertions, 0 deletions
diff --git a/trans/identity.c b/trans/identity.c
new file mode 100644
index 00000000..875fc4f3
--- /dev/null
+++ b/trans/identity.c
@@ -0,0 +1,113 @@
+/* identity -- a translator interposing file RPCs.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2, or (at
+   your option) any later version.
+
+   This program is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
+
+#include <argp.h>
+#include <error.h>
+#include <fcntl.h>
+#include <hurd/netfs.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <version.h>
+
+#include "chroot.h"
+
+const char *argp_program_version = STANDARD_HURD_VERSION (identity);
+
+char *netfs_server_name = "identity";
+char *netfs_server_version = HURD_VERSION;
+int netfs_maxsymlinks = 16;	/* arbitrary */
+
+struct chroot_node
+{
+};
+
+void
+chroot_node_norefs (struct node *np)
+{
+}
+
+
+static struct argp_option options[] =
+{
+  {0}
+};
+
+static char *args_doc = "";
+static char *doc =
+  "The identity translator relays file RPCs without changing them."
+  "\v"
+  "It can be used in conjunction with settrans --chroot to implement "
+  "a hurdish chroot utility.";
+
+static error_t
+parse_opt (int key, char *arg, struct argp_state *state)
+{
+  switch (key)
+    {
+    default:
+      return ARGP_ERR_UNKNOWN;
+    }
+  return 0;
+}
+
+int
+main (int argc, char **argv)
+{
+  error_t err;
+  mach_port_t bootstrap;
+
+  struct argp argp =
+    {
+      .options = options,
+      .parser = parse_opt,
+      .args_doc = args_doc,
+      .doc = doc,
+    };
+
+  /* Parse our command line arguments (all none of them).  */
+  argp_parse (&argp, argc, argv, 0, 0, 0);
+
+  task_get_bootstrap_port (mach_task_self (), &bootstrap);
+  if (! MACH_PORT_VALID (bootstrap))
+    error (1, 0, "Must be started as a translator");
+
+  netfs_init ();
+  chroot_init ();
+
+  /* Get our underlying node (we presume it's a directory) and use
+     that to make the root node of the filesystem.  */
+  err = chroot_new_node (netfs_startup (bootstrap, O_READ),
+                         sizeof (struct chroot_node), &netfs_root_node);
+  if (err)
+    error (5, err, "Cannot create root node");
+
+  err = netfs_validate_stat (netfs_root_node, 0);
+  if (err)
+    error (6, err, "Cannot stat underlying node");
+
+  netfs_root_node->nn_stat.st_mode &= ~(S_IPTRANS | S_IATRANS);
+  netfs_root_node->nn_stat.st_mode |= S_IROOT;
+  pthread_mutex_unlock (&netfs_root_node->lock);
+
+  netfs_server_loop ();		/* Never returns.  */
+
+  /*NOTREACHED*/
+  return 0;
+}