From a0769a8d73f90103518a032a5cc50c80a4139027 Mon Sep 17 00:00:00 2001
From: Murray Stokely <murray@FreeBSD.org>
Date: Mon, 24 Sep 2001 10:16:23 +0000
Subject: Add a couple of functions to create persistent variables that will
 survive a sysinstall Ctrl-C -> 'Restart'.  This fixes another annoying bug
 where restarting sysinstall will try to reload kernel modules and do other
 external things that have already been done.  For now, use these persistent
 variables to keep track of module, usbd, and pccardd initialization.

Bug found by: rwatson
MFC after:    1 week
---
 usr.sbin/sysinstall/variable.c | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

(limited to 'usr.sbin/sysinstall/variable.c')

diff --git a/usr.sbin/sysinstall/variable.c b/usr.sbin/sysinstall/variable.c
index 2def090ac272f..6f896ee8a7e4f 100644
--- a/usr.sbin/sysinstall/variable.c
+++ b/usr.sbin/sysinstall/variable.c
@@ -8,6 +8,8 @@
  *
  * Copyright (c) 1995
  *	Jordan Hubbard.  All rights reserved.
+ * Copyright (c) 2001 
+ *      Murray Stokely.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -257,3 +259,38 @@ free_variables(void)
 	VarHead = NULL;
     }
 }
+
+/*
+ * Persistent variables.  The variables modified by these functions
+ * are not cleared between invocations of sysinstall.  This is useful
+ * to allow the user to completely restart sysinstall, without having
+ * it load all of the modules again from the installation media which
+ * are still in memory.
+ */
+
+void
+pvariable_set(char *var)
+{
+    char tmp[1024];
+
+    if (!var)
+	msgFatal("NULL variable name & value passed.");
+    else if (!*var)
+	msgDebug("Warning:  Zero length name & value passed to variable_set()\n");
+    /* Add a trivial namespace to whatever name the caller chooses. */
+    SAFE_STRCPY(tmp, "SYSINSTALL_PVAR");
+    if (index(var, '=') == NULL)
+	msgFatal("Invalid variable format: %s", var);
+    strlcat(tmp, var, 1024); 
+    putenv(tmp);
+}
+
+char *
+pvariable_get(char *var)
+{
+    char tmp[1024];
+
+    SAFE_STRCPY(tmp, "SYSINSTALL_PVAR");
+    strlcat(tmp, var, 1024);
+    return getenv(tmp);
+}
-- 
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