Add a switch_root utility (like kconfig's utils/run_init.c, although not

actuall using any of that code).  This is needed because pivot_root doesn't
work right under initramfs.  (See the menuconfig help.)


git-svn-id: svn://busybox.net/trunk/busybox@11935 69ca8d6d-28ef-0310-b511-8ec308f3f277

2 files changed, 9 insertions, 0 deletions

diff --git a/include/applets.h b/include/applets.h
index a814ce1b1..883e55990 100644
--- a/include/applets.h
+++ b/include/applets.h
@@ -625,6 +625,9 @@
 #ifdef CONFIG_SWAPONOFF
         APPLET(swapon, swap_on_off_main, _BB_DIR_SBIN, _BB_SUID_NEVER)
 #endif
+#ifdef CONFIG_SWITCH_ROOT
+        APPLET(switch_root, switch_root_main, _BB_DIR_SBIN, _BB_SUID_NEVER)
+#endif
 #ifdef CONFIG_SYNC
         APPLET(sync, sync_main, _BB_DIR_BIN, _BB_SUID_NEVER)
 #endif
diff --git a/include/usage.h b/include/usage.h
index bef6a4dd2..69c50b97b 100644
--- a/include/usage.h
+++ b/include/usage.h
@@ -2735,6 +2735,12 @@
         "Options:\n" \
         "\t-a\tStart swapping on all swap devices"
 
+#define switch_root_trivial_usage \
+        "NEW_ROOT NEW_INIT [ARGUMENTS_TO_INIT]"
+#define switch_root_full_usage \
+        "Use from PID 1 under initramfs to free initramfs, chroot to NEW_ROOT,\n" \
+        "and exec NEW_INIT.\n"
+
 #define sync_trivial_usage \
         ""
 #define sync_full_usage \