From 27f5779a7a3d71cd26107d26330c67445341e879 Mon Sep 17 00:00:00 2001
From: Rob Landley <rob@landley.net>
Date: Fri, 3 Feb 2012 23:16:28 -0600
Subject: Add autodetect for container support.

---
 Makefile             |  2 +-
 scripts/genconfig.sh | 21 +++++++++++++++++----
 toys/unshare.c       |  1 +
 3 files changed, 19 insertions(+), 5 deletions(-)

diff --git a/Makefile b/Makefile
index d42dd3f3..df24c513 100644
--- a/Makefile
+++ b/Makefile
@@ -12,7 +12,7 @@ toybox toybox_unstripped: .config *.[ch] lib/*.[ch] toys/*.[ch] scripts/*.sh
 include kconfig/Makefile
 
 $(KCONFIG_TOP): generated/Config.in
-generated/Config.in: toys/*.c
+generated/Config.in: toys/*.c scripts/genconfig.sh
 	scripts/genconfig.sh
 
 HOSTCC:=cc
diff --git a/scripts/genconfig.sh b/scripts/genconfig.sh
index 126e52ef..1911efc6 100755
--- a/scripts/genconfig.sh
+++ b/scripts/genconfig.sh
@@ -4,16 +4,29 @@
 # before menuconfig.  (It's called again from scripts/make.sh just to be sure.)
 
 mkdir -p generated
+OUTFILE=generated/Config.in
 
-function genconfig()
+genconfig()
 {
-  for i in $(echo toys/*.c | sort)
+  # Probe for container support on target
+
+  echo -e "# container support\nconfig TOYBOX_CONTAINER\n\tbool" || return 1
+  $CC -c -xc -o /dev/null - 2>/dev/null << EOF
+    #include <sched.h>
+    int x=CLONE_NEWNS|CLONE_NEWUTS|CLONE_NEWIPC|CLONE_NEWNET;
+EOF
+  [ $? -eq 0 ] && DEFAULT=y || DEFAULT=n
+  echo -e "\tdefault $DEFAULT\n" || return 1
+
+  # extract config stanzas from each command source file, in alphabetical order
+
+  for i in $(ls -1 toys/*.c)
   do
     # Grab the config block for Config.in
     echo "# $i"
-    sed -n '/^\*\//q;/^config [A-Z]/,$p' $i || exit 1
+    sed -n '/^\*\//q;/^config [A-Z]/,$p' $i || return 1
     echo
   done
 }
 
-genconfig > generated/Config.in
+genconfig > generated/Config.in || rm "$OUTFILE"
diff --git a/toys/unshare.c b/toys/unshare.c
index c708ebe9..6485e334 100644
--- a/toys/unshare.c
+++ b/toys/unshare.c
@@ -11,6 +11,7 @@ USE_UNSHARE(NEWTOY(unshare, "<1^nium", TOYFLAG_USR|TOYFLAG_BIN))
 config UNSHARE
 	bool "unshare"
 	default y
+	depends on TOYBOX_CONTAINER
 	help
 	  usage: unshare [-muin] COMMAND...
 
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