[PATCH 4/6] procfs: handle the --update parameter

[Justus Winter]

Split the argument handling into a common part and one for
fsys_update_options. Handle the --update parameter; for procfs this is
a no-op.

* procfs/main.c (common_options): New variable.
(runtime_argp_parser): Handle --update.
(startup_argp): New variable.
(netfs_runtime_argp_): New variable.
---
 procfs/main.c |   93 ++++++++++++++++++++++++++++++++++++++++-----------------
 1 file changed, 65 insertions(+), 28 deletions(-)

diff --git a/procfs/main.c b/procfs/main.c
index 1b19c01..ba74e87 100644
--- a/procfs/main.c
+++ b/procfs/main.c
@@ -109,45 +109,82 @@ argp_parser (int key, char *arg, struct argp_state *state)
   return 0;
 }
 
+struct argp_option common_options[] = {
+  { "clk-tck", 'h', "HZ", 0,
+      "Unit used for the values expressed in system clock ticks "
+      "(default: sysconf(_SC_CLK_TCK))" },
+  { "stat-mode", 's', "MODE", 0,
+      "The [pid]/stat file publishes information which on Hurd is only "
+      "available to the process owner.  "
+      "You can use this option to override its mode to be more permissive "
+      "for compatibility purposes.  "
+      "(default: 0400)" },
+  { "fake-self", 'S', "PID", OPTION_ARG_OPTIONAL,
+      "Provide a fake \"self\" symlink to the given PID, for compatibility "
+      "purposes.  If PID is omitted, \"self\" will point to init.  "
+      "(default: no self link)" },
+  { "kernel-process", 'k', "PID", 0,
+      "Process identifier for the kernel, used to retreive its command "
+      "line, as well as the global up and idle times. "
+      "(default: 2)" },
+  { "compatible", 'c', NULL, 0,
+      "Try to be compatible with the Linux procps utilities.  "
+      "Currently equivalent to -h 100 -s 0444 -S 1." },
+  { "anonymous-owner", 'a', "USER", 0,
+      "Make USER the owner of files related to processes without one.  "
+      "Be aware that USER will be granted access to the environment and "
+      "other sensitive information about the processes in question.  "
+      "(default: use uid 0)" },
+  {}
+};
+
 struct argp argp = {
-  .options = (struct argp_option []) {
-    { "clk-tck", 'h', "HZ", 0,
-       "Unit used for the values expressed in system clock ticks "
-       "(default: sysconf(_SC_CLK_TCK))" },
-    { "stat-mode", 's', "MODE", 0,
-       "The [pid]/stat file publishes information which on Hurd is only "
-       "available to the process owner.  "
-       "You can use this option to override its mode to be more permissive "
-       "for compatibility purposes.  "
-       "(default: 0400)" },
-    { "fake-self", 'S', "PID", OPTION_ARG_OPTIONAL,
-       "Provide a fake \"self\" symlink to the given PID, for compatibility "
-       "purposes.  If PID is omitted, \"self\" will point to init.  "
-       "(default: no self link)" },
-    { "kernel-process", 'k', "PID", 0,
-       "Process identifier for the kernel, used to retreive its command "
-       "line, as well as the global up and idle times. "
-       "(default: 2)" },
-    { "compatible", 'c', NULL, 0,
-       "Try to be compatible with the Linux procps utilities.  "
-       "Currently equivalent to -h 100 -s 0444 -S 1." },
-    { "anonymous-owner", 'a', "USER", 0,
-       "Make USER the owner of files related to processes without one.  "
-       "Be aware that USER will be granted access to the environment and "
-       "other sensitive information about the processes in question.  "
-       "(default: use uid 0)" },
+  .options = common_options,
+  .parser = argp_parser,
+  .doc = "A virtual filesystem emulating the Linux procfs.",
+  .children = (struct argp_child []) {
+    { &netfs_std_startup_argp, },
     {}
   },
+};
+
+static error_t
+runtime_argp_parser (int key, char *arg, struct argp_state *state)
+{
+  switch (key)
+  {
+    case 'u':
+      /* do nothing */
+      break;
+
+    default:
+      return ARGP_ERR_UNKNOWN;
+  }
+
+  return 0;
+}
+
+struct argp runtime_argp = {
+  .options = (struct argp_option []) {
+    { "update", 'u', NULL, 0, "remount; for procfs this does nothing" },
+    {},
+  },
+  .parser = runtime_argp_parser,
+};
+
+struct argp netfs_runtime_argp_ = {
+  .options = common_options,
   .parser = argp_parser,
   .doc = "A virtual filesystem emulating the Linux procfs.",
   .children = (struct argp_child []) {
-    { &netfs_std_startup_argp, },
+    { &runtime_argp, },
+    { &netfs_std_runtime_argp, },
     {}
   },
 };
 
 /* Used by netfs_set_options to handle runtime option parsing.  */
-struct argp *netfs_runtime_argp = &argp;
+struct argp *netfs_runtime_argp = &netfs_runtime_argp_;
 
 error_t
 root_make_node (struct ps_context *pc, struct node **np)
-- 
1.7.10.4