From 8d18ae5ae75bc756efe3354412b5bdbe6dfa6573 Mon Sep 17 00:00:00 2001
From: Roger Pau Monne <roger.pau@citrix.com>
Date: Thu, 10 Mar 2022 16:08:32 +0100
Subject: [PATCH] livepatch: use basename to perform object file matching
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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>
---
 livepatch-gcc | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/livepatch-gcc b/livepatch-gcc
index 91333d5..fe782e0 100755
--- 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"
-- 
2.39.5