livepatch: use basename to perform object file matching

The changes in the Xen build logic has resulted in the compiler and
objcopy being called from xen/ instead of relative to each object
directory. This requires using basename so that the directory is not
taken into account when checking against the list of files to be
explicitly ignored.

Also adjust the paths used to store the differing object files, as
with the current logic the resulting path will be wrong when using
newer Xen versions, changed_objs would end containing entries like:

xen/arch/x86/hvm/vmx/arch/x86/hvm/vmx/vmx.o

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Bjoern Doebel <doebel@amazon.de>
Reviewed-by: Ross Lagerwall <ross.lagerwall@citrix.com>
Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com>

diff --git a/livepatch-gcc b/livepatch-gcc
index 91333d5b60f55bb023f57c8de70d399f2f7c3b03..fe782e091a1577521a2436cd05829604ae15a5e0 100755 (executable)
--- a/livepatch-gcc
+++ b/livepatch-gcc
@@ -32,10 +32,10 @@ if [[ "$TOOLCHAINCMD" =~ $GCC_RE ]] ; then
         if [ "$1" = "-o" ]; then
             obj=$2
             [[ $2 = */.tmp_*.o ]] && obj=${2/.tmp_/}
-            case "$obj" in
+            case "$(basename $obj)" in
             version.o|\
             debug.o|\
-            efi/check.o|\
+            check.o|\
             *.xen-syms.*.o|\
             *.xen.efi.*.o|\
             built_in.o|\
@@ -46,6 +46,7 @@ if [[ "$TOOLCHAINCMD" =~ $GCC_RE ]] ; then
             *.o)
                 path="$(pwd)/$(dirname $obj)"
                 dir="${path#$LIVEPATCH_BUILD_DIR}"
+                obj=$(basename $obj)
                 if [ -n "$LIVEPATCH_CAPTURE_DIR" -a -d "$LIVEPATCH_CAPTURE_DIR" ]; then
                     echo "$dir/$obj" >> "${LIVEPATCH_CAPTURE_DIR}/changed_objs"
                     keep=yes
@@ -61,15 +62,16 @@ if [[ "$TOOLCHAINCMD" =~ $GCC_RE ]] ; then
 done
 elif [[ "$TOOLCHAINCMD" =~ $OBJCOPY_RE ]] ; then
     obj="${!#}"
-    case "$obj" in
+    case "$(basename $obj)" in
         version.o|\
         debug.o|\
-        efi/check.o|\
+        check.o|\
         .*.o)
             ;;
         *.o)
             path="$(pwd)/$(dirname $obj)"
             dir="${path#$LIVEPATCH_BUILD_DIR}"
+            obj=$(basename $obj)
             if [ -n "$LIVEPATCH_CAPTURE_DIR" -a -d "$LIVEPATCH_CAPTURE_DIR" ]; then
                 echo "$dir/$obj" >> "${LIVEPATCH_CAPTURE_DIR}/changed_objs"
                 keep=yes
@@ -85,7 +87,7 @@ ret="$?"
 
 if [[ "$keep" = "yes" ]] ; then
     mkdir -p "$(dirname $LIVEPATCH_CAPTURE_DIR/$dir/$obj)"
-    cp "$obj" "$LIVEPATCH_CAPTURE_DIR/$dir/$obj"
+    cp "$path/$obj" "$LIVEPATCH_CAPTURE_DIR/$dir/$obj"
 fi
 
 exit "$ret"