[sysupgrade] Don't try to pivot to new ramfs if already running on one

This patch allows the sysupgrade script to continue with the upgrade if
openwrt is already running on a ramfs. This allows the use of the sysupgrade
script as an _installer_ when running from an iso image. A user could boot the
system from a bootable cd and invoke sysupgrade -n <URL> to write an image to
the hard disk or CF.

Signed-off-by: Vasilis Tsiligiannis <b_tsiligiannis@silverton.gr>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@15683 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/package/base-files/files/sbin/sysupgrade b/package/base-files/files/sbin/sysupgrade
index 83cc956..139135e 100755 (executable)
--- a/package/base-files/files/sbin/sysupgrade
+++ b/package/base-files/files/sbin/sysupgrade
@@ -109,5 +109,9 @@ else
 fi
 run_hooks "" $sysupgrade_pre_upgrade
 
-v "Switching to ramdisk..."
-run_ramfs '. /etc/functions.sh; include /lib/upgrade; do_upgrade'
+if [ -n "$(rootfs_type)" ]; then
+       v "Switching to ramdisk..."
+       run_ramfs '. /etc/functions.sh; include /lib/upgrade; do_upgrade'
+else
+       do_upgrade
+fi
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