1 files changed, 43 insertions, 0 deletions

diff --git a/meta/recipes-core/busybox/busybox.inc b/meta/recipes-core/busybox/busybox.inc
index 1a82f23b0f..344e891f7a 100644
--- a/meta/recipes-core/busybox/busybox.inc
+++ b/meta/recipes-core/busybox/busybox.inc
@@ -433,6 +433,32 @@ fi
     d.prependVar('pkg_postinst_%s' % pkg, postinst)
 }
 
+pkg_postinst_${PN}_prepend () {
+        # Need path to saved utils, but they may have be removed on upgrade of busybox
+        # Only use shell to get paths. Also capture if busybox was saved.
+        BUSYBOX=""
+        if [ "x$D" = "x" ] ; then 
+           for busybox_rmdir in /tmp/busyboxrm-*; do
+               if [ "$busybox_rmdir" != '/tmp/busyboxrm-*' ] ; then
+                  export PATH=$busybox_rmdir:$PATH
+                  if [ -e $busybox_rmdir/busybox* ] ; then
+                    BUSYBOX="$busybox_rmdir/busybox*"
+                  fi
+               fi
+           done
+        fi
+}
+
+pkg_postinst_${PN}_append () {
+        # If busybox exists in the remove directory it is because it was the only shell left.
+        if [ "x$D" = "x" ] ; then
+           if [ "x$BUSYBOX" != "x" ] ; then
+              update-alternatives --remove sh $BUSYBOX
+              rm -f $BUSYBOX
+           fi
+        fi
+} 
+
 pkg_prerm_${PN} () {
         # This is so you can make busybox commit suicide - removing busybox with no other packages
         # providing its files, this will make update-alternatives work, but the update-rc.d part
@@ -453,9 +479,26 @@ pkg_prerm_${PN} () {
         ln -s ${base_bindir}/busybox $tmpdir/grep
         ln -s ${base_bindir}/busybox $tmpdir/tail
         export PATH=$PATH:$tmpdir
+
+        # If busybox is the shell, we need to save it since its the lowest priority shell
+        # Register saved bitbake as the lowest priority shell possible as back up.
+        if [ -n "$(readlink -f /bin/sh | grep busybox)" ] ; then
+           BUSYBOX=$(readlink -f /bin/sh)
+           cp $BUSYBOX $tmpdir/$(basename $BUSYBOX)
+           update-alternatives --install /bin/sh sh $tmpdir/$(basename $BUSYBOX) 1 
+        fi
 }
 
 pkg_postrm_${PN} () {
+        # Add path to remove dir in case we removed our only grep
+        if [ "x$D" = "x" ] ; then
+           for busybox_rmdir in /tmp/busyboxrm-*; do
+               if [ "$busybox_rmdir" != '/tmp/busyboxrm-*' ] ; then
+                  export PATH=$busybox_rmdir:$PATH
+               fi
+           done
+        fi
+
         if grep -q "^${base_bindir}/bash$" $D${sysconfdir}/busybox.links* && [ ! -e $D${base_bindir}/bash ]; then
                 printf "$(grep -v "^${base_bindir}/bash$" $D${sysconfdir}/shells)\n" > $D${sysconfdir}/shells
         fi